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000-911 exam Dumps Source : System and Administration: Informix Dynamic Server

Test Code : 000-911
Test name : System and Administration: Informix Dynamic Server
Vendor name : IBM
: 142 actual Questions

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IBM IBM System and Administration:

main European corporations opt for IBM Blockchain to coerce Innovation | killexams.com actual Questions and Pass4sure dumps

No outcomes discovered, are attempting modern key phrase!The vital financial institution of the Republic of Azerbaijan and IBM are establishing a Digital Identification system in response to Hyperledger cloth, A Linux basis framework, to examine the reliability of the docume...

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IBM’s blockchain-powered AR gaming system is dangerously flawed | killexams.com actual Questions and Pass4sure dumps

You can be difficult-pressed to factor to a provider that productively combines the exhaust of augmented fact (AR), desktop discovering, and blockchain – but that doesn’t flaunt to hassle IBM.

The industry has filed a patent application for a posh AR gaming equipment, designed to steer players away from doubtlessly unhealthy actual areas. To this end, IBM intends to exhaust machine getting to know and blockchain tech to construct this modern system.

however does this strategy accomplish sense? well, let’s dig into into the patent file.

inner the patent

in response to the patent (spotted by using CCN), the gadget will notify gamers any time they fashion a local marked as undesirable (like “high risk places, culturally sensitive places, locations marked by pass of house owners”). IBM hopes this may uphold avid gamers navigate away from situation.

The documentation notes that as soon as players fill agreed to having their set statistics tracked, the system might be in a position to compare clients’ set against a database of physical spaces marked as undesirable. each time a player enters such areas, the system will notify clients they’re going for walks on potentially unsafe turf.

due to the fact the litany of trespassing incidents they saw during the Pokémon proceed craze, making a system that directs avid gamers away from restrained areas sounds dote a wonderful suggestion on paper. however there are a few technological challenges to rob note of – birth with IBM’s exhaust of blockchain.

The hardship with the usage of blockchain

IBM says it intends to accomplish exhaust of blockchain to set up “have confidence” about “actual world places” and stop malicious avid gamers from offering delusory set facts for private positive factors.

“A blockchain is a allotted database that maintains a constantly-transforming into checklist of data facts hardened against tampering and revision,” the patent reads. “The blockchain paraphernalia securely tracks, shops, and keeps vicinity related transactions together with different location metadata.”

but there are some pretty astronomical question marks with this implementation.

For one, using blockchain does not with the aid of itself present protection to towards the possibility of recording delusory (or straight-up false) data. It purely implies that as soon as recorded, statistics may be immutable (until the blockchain has backdoors developed into it). but that doesn’t imply the system might be resistant to manipulation.

as an instance, malicious actors will soundless be in a position to feed untrue location facts to IBM’s blockchain-powered equipment, until it furthermore comes with oracles – sensors chiefly designed to validate movements that rob location outdoor of a blockchain. Worryingly, there is no mention of an oracle implementation in IBM’s patent application.

To create this sort of “have faith,” IBM will deserve to boost sensors that may safely ascertain the authenticity of any belt records within the virtuous world earlier than storing it on its own blockchain.

Blockchainifying computing device researching

much more puzzling is IBM’s diagram to exhaust desktop gaining information of to interpret blockchain-saved vicinity statistics and warn users of information possibility.

The patent suggests that, because of superior neural networks, the device could be able to conducting possibility prediction projects with “various levels of confidence.” these predictions will then be forwarded to any clients who should be would becould very well be in danger, or in the vicinity of risky areas.

IBM aspects out clients will even be able to exhaust this performance to specify what they'd want to be covered from. for example, a diabetic player can request the gadget to notify them every time they’ve strayed away from any viable help.

however devoid of oracles in region, it may betoken too handy for cheaters to ill-treat the device. indeed, a malicious participant could label protected areas as “harmful” to maintain competing avid gamers away from sure locations. Or on the other hand, scammers could ill-treat the paraphernalia to track in any other case unsafe areas as “protected,” and trap unsuspecting victims into unsafe instances.

IBM and the blockchain

All these concerns apart, IBM has yet to point out how stern it is ready its patent. in any case, blockchain might now not be the most suitable option for this specific utility.

As is the case with most patent filings, there is no telling when – if ever – IBM will greenlight the notion for building. but when it does, it more advantageous tackle these considerations before it puts someone at risk.

And for what it’s worth, I essentially hope IBM’s other blockchain-connected initiatives are a itsy-bitsy more advantageous concept out.

published November 5, 2018 — 17:28 UTC

mix


Killexams.com 000-911 Dumps and actual Questions

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000-911 exam Dumps Source : System and Administration: Informix Dynamic Server

Test Code : 000-911
Test name : System and Administration: Informix Dynamic Server
Vendor name : IBM
: 142 actual Questions

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System and Administration: Informix Dynamic Server

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IBM and AGS proclaim Availability of modern Solutions for Informix Dynamic Server | killexams.com actual questions and Pass4sure dumps

SOURCE: IBM

July 05, 2007 12:00 ET

New Server Studio and Sentinel R. 6.1 to Enable Rapid Adoption of IDS 11 "Cheetah"

ARMONK, NY and modern YORK, NY--(Marketwire - July 5, 2007) - IBM (NYSE: IBM) and AGS Ltd., a privately held purveyor of management solutions for data servers, today announced that the modern Server Studio and Sentinel R. 6.1 -- the principal suite of integrated system management tools for IBM Informix Dynamic Server (IDS) -- is now available, with editions offered by both IBM and AGS.

The IDS data server is a strategic component of IBM's Information Management software portfolio and the recently announced IDS 11 -- code named Cheetah -- delivers increased performance, reliability and scalability, along with the talent to wield massive volumes of intricate data at very towering speeds. IDS 11 is furthermore the industry's first data server to provide clustered data centers with continuous data availability and catastrophe recovery regardless of the geographic location or distance between backup data focus sites.

Server Studio and Sentinel together contour a powerful infrastructure of multi-platform tools that back both seasoned database professionals and novices alike manage IBM Informix data server environments with an unprecedented ease and productivity. autochthonous uphold of IDS 11 modern functionality in the Release 6.1 of Server Studio and Sentinel further enhances talent to deliver optimal performance, availability and maintainability of Informix databases throughout their entire operational life cycle.

"Our long-term partnership with AGS underscores IBM's steadfast commitment to providing IDS clients with the performance optimization, availability and compliance management solutions they need," said Bernie Spang, director IBM data servers. "The modern Release 6.1 of Server Studio and Sentinel will back protect the investment that their customers fill made in their Informix data server infrastructures."

The versatility, rich functionality and ease-of-use provided by Server Studio and Sentinel build on the legendary reliability and simple administration of IDS. The modern utensil set offered by AGS helps companies and organizations ensure that critical database applications remain up and accomplish at peak levels, allowing them to effectively manage change, wield regulatory compliance and assure availability of vital industry information.

Bank of America recently selected Server Studio and Sentinel for its IDS environment -- one of the world's largest distributed data centers processing online financial transactions.

"The latest release of Server Studio and Sentinel provide a collection of integrated, highly productive system management tools that developers and DBAs working with IBM's Informix data servers fill been demanding and waiting for. Informix now has very powerful graphical tools that exceed the capabilities of autochthonous and third party offerings available for any other database platform. brace this with outstanding technical uphold and you pick up products with excellent value and a quick ROI," said Kevin Kleinhomer, Vice President at Bank of America. "In their great distributed environment, Server Studio and Sentinel fill simplified and automated many DBA tasks. With these additions, IBM's Informix data servers fill been made significantly easier to administer and monitor."

Server Studio provides a comprehensive collection of easy-to-use, proven tools for DBAs and developers that ameliorate efficiency of performing common database tasks such as: SQL development and debugging, schema management, configuration auditing and change management, performance tuning, data storage management and reorganization, security administration and more -- All from an integrated graphical console that unites development, administration and maintenance activities for an entire Informix infrastructure at a central point of control.

Sentinel provides 24 × 7 operational monitoring, alerting, issue discovery, analysis and autonomic response automation infrastructure for IBM Informix data servers' environment. It's effortless to deploy agent-less architecture equips DBAs with sophisticated diagnostics and remediation facilities which back pinpoint and resolve the underlying causes of performance bottlenecks and resources contention issues that adversely feel databases' availability and impact finish users.

Smaller companies and organizations that outcome not fill great IT staffs to manage great data servers infrastructure fill furthermore benefited from the robust application development and administration capabilities provided by IDS and Server Studio.

"As a software developer and DBA, Server Studio is a utensil that I exhaust every day, and it is exactly what I require from my tools -- stable, reliable, and powerful," said Sean Durity, Manager of IT for CornerCap Investment Counsel. "Even the 'small' features of Server Studio are astronomical timesavers. I can't imagine working with Informix and not using Server Studio. I won't travail with anything less."

The relationship between AGS and IBM began in 2000 when IBM began distributing AGS' Server Studio as the primary database development and administration tools suite with Informix data servers. Product management, engineering and QA teams of both companies travail closely on product direction, technology development and QA testing of Server Studio and Sentinel.

"We are proud of and greatly value their strategic partnership with IBM. Selection of AGS data servers' management solutions by IBM is a testament to their industry-leading technology," said Anatole Vishon, CEO of AGS Ltd. "We understand the vital minute of Informix, particularly in the retail, financial, telecommunications, healthcare, government and SMB sectors. AGS is committed to supporting existing capabilities and developing modern technologies for Informix data servers to add value for IBM customers."

Pricing and Availability

The Release 6.1 of Server Studio and Sentinel are available now through IBM and AGS worldwide. The Core Edition of Server Studio is provided by IBM to Informix customers at no additional cost. Its basic functionality can be extended by purchase of various premium editions available directly from AGS.

Additional information about Server Studio is available at: http://www.ibm.com/software/data/informix/serverstudio/, or http://www.serverstudio.com/products/serverstudio/

Additional information about Sentinel is available at: http://www.ibm.com/software/data/informix/sentinel/, or http://www.serverstudio.com/products/sentinel/

Additional information about Informix Dynamic Server is available at: http://www.ibm.com/software/data/informix/ids/

AGS, Server Studio and Sentinel are trademarks or registered trademarks of Advanced Global Systems, Ltd. For a list of additional AGS trademarks, gladden behold http://www.ags.com

IBM, Informix Dynamic Server and the IBM e-business logo are trademarks or registered trademarks of International industry Machines Corporation. For a list of additional IBM trademarks, gladden behold www.ibm.com/legal/copytrade.shtml

All other company, product or service names may be trademarks or registered trademarks of others. Statements concerning IBM's future development plans and schedules are made for planning purposes only, and are theme to change or withdrawal without notice. Reseller prices may vary.


Efficient Vehicle Tracking System Software Solution with Informix Dynamic Server | killexams.com actual questions and Pass4sure dumps

Nov 10, 2011

Vaibhav Dantale

Although  it is workable to develop an efficient Vehicle Tracking System using any database server, and many such solutions are already available in the market, Informix offers many advantages. Informix can reduce your disk space requirement, ameliorate your query performance, and reduce your application development efforts, without special training or buying additional technology. The built-in technologies of Informix will reduce your total cost of ownership, so if these benefits are vital to you, maintain reading!

A Vehicle Tracking System (VTS) tracks vehicles and provides different analytics, such as the total distance travelled, the total fuel consumption, the best routes, and so on. Certainly having more and more different kinds of alerts improves the efficiency of system. This system encompasses three phases of implementation: instrumentation, integration, and intelligence.

Instrumentation: Each vehicle has a special device that records different parameters related to a vehicle, such as, speed, current location, fuel status, ignition status, and so on.

Integration: Devices implemented in the realm transmit information through an integrated system that includes a GPRS system and stores the information in a database.

Intelligence: The intelligence on the information collected from the realm is stored in a database, including different kinds of MIS reports, dashboards, current locations of vehicles, travel information, and reports of exceptions dote geo-fence violations and fuel theft.

Some of the characteristics of a VTS are:

  • Information about vehicles is collected every few minutes or as often as every minute
  • The volume of the data is huge
  • Performance is critical
  • Accuracy of the data matters the most
  • The application logic is specific to the industry (for example, geo-fencing, distance calculations, and so on)
  • Now let's behold the advantages of Informix built-in technologies over the traditional relational approach.

    Disk Space Saving (62%)

    A vehicle tracking system collects the vehicle-related information, including a time stamp, with a specific frequency. Informix provides a data sort that stores this sort of time progression information more efficiently than any traditional RDBMS approach. The following tables compare both approaches.

    Traditional RDBMS approach

    This table shows the structure of the tracking table in a traditional RDBMS.

    Vehicle number

    Timestamp

    Longitude

    Latitude

    Fuel

    Speed

    1

    2010-12-01 01:00:00.00000

    72.844060

    19.116280

    85.00

    40.00

    1

    2010-12-01 01:00:10.00000

    72.853800

    19.113470

    84.90

    39.00

    1

    2010-12-01 01:00:20.00000

    72.855000

    19.116560

    84.80

    42.00

    .

    .

    2

    2010-12-01 01:00:00.00000

    72.855370

    19.116570

    100.00

    45.00

    2

    2010-12-01 01:00:10.00000

    72.885120

    19.106000

    99.90

    45.00

    .

    .

    Informix TimeSeries data sort approach

    Informix stores time progression data in a specialized data type, called TimeSeries, which stores All the time progression data for a particular vehicle in the same row. Informix supports two different types of time series: regular time progression that stores the data with a fixed frequency, and irregular time progression that stores the data for arbitrary points in time. A regular time progression is the most suitable for a VTS. In a regular time series, the time stamp is stored only once as the root of the time progression and the time stamps of the repose of the rows are calculated using the offset from the origin.

    This table shows the structure of the tracking table in Informix, using the TimeSeries data type.

    Vehicle number

    TimeSeries column

    1

    [(72.844060, 19.116280,85.00,40.00), (72.853800, 19.113470,84.90, 39.00)....]

    2

    [(72.855370, 19.116570, 100.00,45.00), (72.885120, 19.106000, 99.90, 45.00)..]

    ..

    ..

    The data for each vehicle is stored in contiguous disk space on a page.

     

    Traditional RDBMS approach

    We create the traditional RDBMS table for storing vehicle tracking information, called vehicle_tracking:

    create table vehicle_tracking

    (

       vehicle_number integer, - 4 (bytes)

       timestamp datetime year to fraction(5) - 11(bytes)

       longitude decimal(10,8), - 6(bytes)

       latitude decimal(10,8)     - 6(bytes)

       precipitate decimal(5,2) - 4(bytes)

    );

    We create an index on the vehicle_number and timestamp columns.

    Suppose they fill 10,000 vehicles to be tracked every minute and they necessity to store information for 90 days. Let's calculate the storage requirements.

    Record size                  = 4+11+6+6+4 = 31

    Record/slot overhead    = 4 bytes

    Total size of record       = 31 + 4 = 35 bytes

    Page overhead for maintaining page information = 28bytes per page

    Total free space on 2 K page size                                 = 2048-28 = 2020byte

    Total records on each page                                           = 2020/35=57

    Total number of records                                                = 10000*60*24*90 = 1296000000

    Total number of pages used                                          = 1296000000 / 57 = 22736842

    Total space required for data                                        = 22736842 * 2 KB = 43 GB

    Total space required for the index                                 =  34 GB

    The total space required for the vehicle_tracking table = 43 + 34 = 77GB

    Informix TimeSeries data sort approach

    We create a TimeSeries data type, named vehicle_tracking_rt, and then create a table, named vehicle_tracking_ts, that includes the vehicle_tracking_rt column:

    create row sort vehicle_tracking_rt

    (

       timestamp datetime year to fraction(5)

       longitude decimal(10,8),

       latitude decimal(10,8),

       precipitate decimal(5,2)

    );

     

    create table vehicle_tracking_ts

    (

       vehicle_number integer,

       vehicle_info timeseries(vehicle_tracking_rt)

    )

    We create an index on only the vehicle_number column.

    We store the vehicle number only once, hence the space required for the vehicle_number column = 10000*4 = 40000bytes=39 KB.

    We create the index on only the vehicle_number column, hence the total space required for the index = 10000*4=40000 bytes = 39 KB.

    We store the time stamp only once for each vehicle, hence the space required for the time stamp = 10000*11 = 110000 bytes = 107 KB.

    The space required for All remaining columns is:

    Record size                  = 6+6+4 = 16

    Record/slot overhead    = 4 bytes

    Total size of record       = 16 + 4 = 20 bytes

    Page overhead for maintaining page information = 28bytes + 16 bytes slot overhead Total free space on 2 K page size                           = 2048-44 = 2004 bytes

    Total records on each page                                           = 2004/20=100

    Total number of pages used per vehicle per day =  1440 / 100 = 15

    Total pages used per day                                              = 10000*15 = 150000

    Total space required for data on first day                       = 150000 * 2 KB = 0.29 GB

    Daily increment in data                                      = 0.27 GB

    Total space required for data of 90 days                       = 25 GB

    The total space required for the vehicle_tracking_ts table = 25 GB +39 KB +29 KB+ 107 KB = 25 GB

    This is a 68% disc space saving compared to a traditional RDBMS approach.

    Performance (up to 54 times faster)

    Let's deem few exhaust cases:

  • Fuel theft information
  • Geo-fence exceptions
  • Total fuel consumption
  • For All of these exhaust cases, the application scans through the data for one day.

    Traditional RDBMS performance

    The report generation requires the following disk reads:

    At least 5 disk reads through the index to attain to leaf nodes

    Each vehicle has 60*24 records per day = 1440

    Each vehicle needs 1440 non-cached disk reads

    Total non-cached distributed disk reads = 1440 * 10000 = 14.4 million

    Informix TimeSeries data sort performance

    Because the index is only 39 KB, the scan endeavor is minimal.

    Because the TimeSeries data sort stores data in contiguous space on a page, for a 2 K page size each page contains at least 2004/20  = 100 rows.

    Each vehicle needs 1440/100 = 15 pages = 15 disk reads.

    Total non-cached distributed disk reads = (15+ 1) * 10000 = 160,000

    Comparison table:

    Space

    Performance

    Traditional RDBMS

    77GB

    8.64 million

    Informix TimeSeries type

    25GB

    160,000

    Benefit

    68% space saving

    54 times faster

    The advantages of using the Informix TimeSeries implementation are:

  • Disk space reduction:  almost 62% disc space saving
  • Performance improvement is multifold: up to 110 times faster
  • Faster development: Informix has more than 80 built-in SQL functions to accomplish different operations on time progression data, such as, aggregation, running average, slimming algorithms, interpolation and extrapolation, and so on.
  • Customized development: Informix provides C and Java APIs to let developers develop their own time progression functions.
  • Application Development

    Because many operations in a VTS application are time based, the available built-in routines for the Informix TimeSeries data sort makes development effortless and fast.

    If they want to behold the middling precipitate of vehicle every 30 minutes, the RDBMS approach requires a great programming endeavor and a performance challenge. Whereas, with the Informix TimeSeries data type, they exhaust the simple AggregateBy office to roll-up the information to any required time frequency.

    If they want to behold the middling precipitate of vehicle in final 30 days, the best fashion is to examine its running middling (not its standard average). Again, showing the running middling precipitate of vehicles with the RDBMS approach is a astronomical programming and performance challenge. Whereas with the Informix TimeSeries data type, they exhaust the simple TSRunningAvg office with the age and frequency that they want.

    Another basic necessity of VTS is storing location-related information. Location information can be in the contour of a point specifying the location of vehicle, a LineString specifying the route, or a Polygon specifying the geo-fence of the vehicle. The easiest pass to wield this sort of information is by using the Informix spatial data types. Informix spatial data types not only optimally maintain the data, but furthermore provide built-in routines that ameliorate the accuracy and ease the development of your solution.

    Let's examine the exhaust case of geo-fencing. Geo-fencing refers to the practice of limiting the vehicle movements to a specific geographical belt by defining the latitude and longitude of the belt in the contour of a LineString or polygon.

    A geo-fence system raises an alarm if one of the vehicles leaves the fenced belt and deviates from its designated route. This might happen because of the personal interest of the vehicle driver or because the vehicle is stolen.

    Traditional RDBMS approach

    We identify the different locations on the route the vehicle is supposed to travel and insert multiple rows into a fence table, comprising information dote the vehicle ID and its location (latitude and longitude) information. If they necessity to track 200 different locations on the designated route for a particular vehicle, they insert 200 rows for that vehicle. To check if the vehicle is outside the fence area, they develop their own logic and flee the cursor through these 200 rows to check if the current location is within any two points.

    To pomp the geo-fence on an online map, they create an XML file by running a cursor through All 200 records and then parse through the XML to pomp each point on the map.

    Informix spatial data types approach

    We define a column called geofence in the master table with a data sort of either polygon or LineString. They store All 200 location co-ordinates in this single column.

    To check if the vehicle is within the fence area, they exhaust the SQL office ST_Within (curr_loc,geofence). If the office returns "True," the vehicle is within the fence area; if it returns "False," the vehicle is outside the fence area.

    To pomp the geo-fence on an online map, they exhaust SE_askml(geofence) function, which creates a KML file that they can import into the map.

    Advantages of using Informix spatial data types

  • Faster development:  functions dote ST_within and SE_askml are readily available
  • Better performance: they don't necessity to flee through multiple records
  • Assured accuracy:  they are using Open GIS Consortium-compliant function
  • More analytics: they can find the nearest location or the distance between any two locations using functions dote Nearest and ST_distance
  • Summary

    Systems dote a Vehicle Tracking System can be developed using any kindly of database as a back-end. But using by the Informix TimeSeries and spatial built-in data types, the same system can be many times more efficient. The disk space saving of 60% and up to 54 times faster performance compared to traditional relational approach can enable you to increase the frequency of data collection, which means better accuracy.  The built-in functions for the  TimeSeries and spatial data types makes the application development stint easier and provides for increased accuracy.

    About the author:

    Vaibhav Dantale is a software engineer within IBM Information Management division. He has been working on Informix for final 12 years, in various development, QA and technical management roles. Currently, Dantale focuses on  evangelizing Informix product in ASIA Pacific region. He is one of the Informix TimeSeries technical experts and has been involved in several  customer engagements on Informix TimeSeries. He has patents under his name and is co-author of a red reserve on Informix security features.


    Database Administration: Creating the Database Environment | killexams.com actual questions and Pass4sure dumps

    Establishing a usable database environment requires a powerful deal of skill, knowledge, and consideration. This chapter will silhouette the principles involved in establishing a usable database environment.

    This chapter is from the reserve 

    One of the primary tasks associated with the job of DBA is the process of choosing and installing a DBMS. Unfortunately, many industry executives and IT professionals without database management background assume that once the DBMS is installed, the bulk of the travail is done. The verity is, choosing and installing the DBMS is hardly the most difficult section of a DBA’s job. Establishing a usable database environment requires a powerful deal of skill, knowledge, and consideration. This chapter will silhouette the principles involved in establishing a usable database environment.

    The process of choosing a suitable DBMS for enterprise database management is not as difficult as it used to be. The number of major DBMS vendors has dwindled due to industry consolidation and domination of the sector by a few very great players.

    Yet, great and medium-size organizations typically flee multiple DBMS products, from as few as two to as many as ten. For example, it is not uncommon for a great company to exhaust IMS or IDMS and DB2 on the mainframe, Oracle and MySQL on several different UNIX servers, Microsoft SQL Server on Windows servers, as well as pockets of other DBMS products such as Sybase, Ingres, Adabas, and PostgreSQL on various platforms, not to mention single-user PC DBMS products such as Microsoft Access, Paradox, and FileMaker. Who chose to install All these DBMSs and why?

    Unfortunately, often the avow is that not much thought and planning went into the decision-making process. Sometimes the determination to purchase and install a modern DBMS is driven by a industry necessity or a modern application. This is reasonable if your organization has no DBMS and must purchase one for the first time. This is rarely the case, though. Regardless of whether a DBMS exists on-site, a modern DBMS is often viewed as a requirement for a modern application. Sometimes a modern DBMS product is purchased and installed without first examining if the application could be successfully implemented using an existing DBMS. Or, more likely, the DBAs know the application can be implemented using an existing DBMS but necessity the organizational power or uphold to reject a modern DBMS proposal.

    There are other reasons for the actuality of multiple DBMS platforms in a single organization. Perhaps the company purchased a commercial off-the-shelf application package that does not flee on any of the current DBMS platforms. Sometimes the determination to buy a modern DBMS is driven by the covet to uphold the latest and greatest technology. For example, many mainframe shops moving from a hierarchic (IMS) or CODASYL (IDMS) database model to the relational model deployed DB2, resulting in an additional DBMS to learn and support. Then, when client/server computing became popular, additional DBMSs were implemented on UNIX, Linux, and Windows servers.

    Once a DBMS is installed, removal can be difficult because of incompatibilities among the different DBMSs and the necessity of converting application code. Furthermore, when a modern DBMS is installed, aged applications and databases are usually not migrated to it. The aged DBMS remains and must continue to be supported. This complicates the DBA’s job.

    So what should be done? Well, the DBA group should be empowered to accomplish the DBMS decisions for the organization. No industry unit should be allowed to purchase a DBMS without the permission of the DBA group. This is a difficult provision to implement and even more difficult to enforce. industry politics often travail against the DBA group because it frequently possesses less organizational power than other industry executives.

    Choosing a DBMS

    The DBA group should set a policy regarding the DBMS products to be supported within the organization. Whenever possible, the policy should minimize the number of different DBMS products. For a shop with multiple operating systems and multiple types of hardware, elect a default DBMS for the platform. discourage aberration from the default unless a compelling industry case exists—a industry case that passes the technical inspection of the DBA group.

    Most of the major DBMS products fill similar features, and if the feature or functionality does not exist today, it probably will within 18 to 24 months. So, exercise caution before deciding to elect a DBMS based solely on its talent to uphold a specific feature.

    When choosing a DBMS, it is sensible to select a product from a tier-1 vendor as listed in Table 2.1. Tier 1 represents the largest vendors having the most heavily implemented and supported products on the market. You cannot proceed wrong with DB2 or Oracle. Both are favorite and uphold just about any sort of database. Another major player is Microsoft SQL Server, but only for Windows platforms. DB2 and Oracle flee on multiple platforms ranging from mainframe to UNIX, as well as Windows and even handheld devices. Choosing a DBMS other than these three should be done only under specific circumstances.

    Table 2.1. Tier-1 DBMS Vendors

    DBMS Vendor

    DBMS Product

    IBM Corporation

    DB2

    New Orchard Road

    Armonk, NY 10504

    Phone: (914) 499-1900

    Oracle Corporation

    Oracle

    500 Oracle Parkway

    Redwood Shores, CA 94065

    Phone: (650) 506-7000

    Microsoft Corporation

    SQL Server

    One Microsoft Way

    Redmond, WA 98052

    Phone: (425) 882-8080

    After the astronomical three attain MySQL, Sybase, Teradata, and Informix. Table 2.2 lists these tier-2 DBMS vendors. All of these offerings are attribute DBMS products, but their installed base is smaller, their products are engineered and marketed for niche purposes, or the companies are smaller with fewer resources than the astronomical Three (IBM, Oracle, and Microsoft), so there is some risk in choosing a DBMS from tier 2 instead of tier 1. However, there may be solid reasons for deploying a tier-2 solution, such as the towering performance offered by Informix or the data warehousing and analytics capabilities of Teradata.

    Table 2.2. Tier-2 DBMS Vendors

    DBMS Vendor

    DBMS Product

    IBM Corporation

    Informix Dynamic Server

    New Orchard Road

    Armonk, NY 10504

    Phone: (914) 499-1900

    Sybase Inc. (an SAP Company)

    Adaptive Server Enterprise

    6475 Christie Avenue

    Emeryville, CA 94608

    Phone: (510) 922-3500

    Teradata Corporation

    Teradata

    10000 Innovation Drive

    Dayton, OH 45342

    Phone: (937) 242-4030

    MySQL (a subsidiary of Oracle Corporation)

    MySQL

    Phone: (208) 338-8100

    Of course, there are other DBMS products on the market, many of which are fine products and worthy of consideration for specialty processing, sure predefined needs, and niche roles. If your company is heavily into the open-source software movement, PostgreSQL, EnterpriseDB, or MySQL might be viable options. If an kick DBMS is vital for a specific project, you might deem ObjectDesign or Versant. And there are a variety of NoSQL DBMS offerings available, too, such as Hadoop, Cassandra, and MongoDB.1

    However, for the bulk of your data management needs, a DBMS from a tier-1, or perhaps tier-2, DBMS vendor will deliver enough functionality with minimal risk. A myriad of DBMS products are available, each with sure features that accomplish them worthy of consideration on a case-by-case basis. Choosing any of the lower-tier candidates—even such major names as Software AG’s Adabas and Actian’s Ingres—involves incurring additional risk. mention to Appendix B for a list of DBMS vendors.

    I outcome not want it to sound as if the selection of a DBMS is a no-brainer. You will necessity a strategy and a diagram for selecting the commandeer DBMS for your specific situation. When choosing a DBMS, be sure to deem each of these factors:

  • Operating system support. Does the DBMS uphold the operating systems in exhaust at your organization, including the versions that you are currently using and diagram on using?
  • Type of organization. rob into consideration the corporate philosophy when you elect a DBMS. Some organizations are very conservative and dote to maintain a taut rein on their environments; these organizations tend to gravitate toward traditional mainframe environments. Government operations, financial institutions, and insurance and health companies usually tend to be conservative. More-liberal organizations are often willing to deem alternative architectures. It is not uncommon for manufacturing companies, dot-coms, and universities to be less conservative. Finally, some companies just outcome not dependence Windows as a mission-critical environment and prefer to exhaust UNIX; this rules out some database vendors (Microsoft SQL Server, in particular).
  • Benchmarks. What performance benchmarks are available from the DBMS vendor and other users of the DBMS? The Transaction Processing Performance Council (TPC) publishes official database performance benchmarks that can be used as a guideline for the basic overall performance of many different types of database processing. (Refer to the sidebar “The Transaction Processing Performance Council” for more details.) In general, performance benchmarks can be useful as a broad indicator of database performance but should not be the only determinant when selecting a DBMS. Many of the TPC benchmarks are flee against database implementations that are not representative of most production database systems and therefore are not indicative of the actual performance of a particular DBMS. In addition, benchmarks are constantly updated to betoken modern and improved performance measurements for each of the major DBMS products, rendering the benchmark “winners” obsolete very quickly.
  • Scalability. Does the DBMS uphold the number of users and database sizes you intend to implement? How are great databases built, supported, and maintained—easily or with a lot of pain? Are there independent users who can validate the DBMS vendor’s scalability claims?
  • Availability of supporting software tools. Are the supporting tools you require available for the DBMS? These items may embrace query and analysis tools, data warehousing uphold tools, database administration tools, backup and recovery tools, performance-monitoring tools, capacity-planning tools, database utilities, and uphold for various programming languages.
  • The Transaction Processing Performance Council is an independent, not-for-profit organization that manages and administers performance benchmark tests. Its mission is to define transaction processing and database benchmarks to provide the industry with objective, verifiable performance data. TPC benchmarks measure and evaluate computer functions and operations.

    The definition of transaction espoused by the TPC is a industry one. A typical TPC transaction includes the database updates for things such as inventory control (goods), airline reservations (services), and banking (money).

    The benchmarks produced by the TPC measure performance in terms of how many transactions a given system and database can accomplish per unit of time, for example, number of transactions per second. The TPC defines three benchmarks:

  • TPC-C, for planned production workload in a transaction environment
  • TPC-H, a determination uphold benchmark consisting of a suite of business-oriented ad hoc queries and concurrent data modifications
  • TPC-E, an updated OLTP workload (based on financial transaction processing)
  • Additional information and in-depth definitions of these benchmarks can be found at the TPC Web site at www.tpc.org (see figure 2.1).

  • Technicians. Is there a enough supply of skilled database professionals for the DBMS? deem your needs in terms of DBAs, technical uphold personnel (system programmers and administrators, operations analysts, etc.), and application programmers.
  • Cost of ownership. What is the total cost of ownership of the DBMS? DBMS vendors permeate wildly varying prices for their technology. Total cost of ownership should be calculated as a combination of the license cost of the DBMS; the license cost of any required supporting software; the cost of database professionals to program, support, and administer the DBMS; and the cost of the computing resources required to operate the DBMS.
  • Release schedule. How often does the DBMS vendor release a modern version? Some vendors fill rapid release cycles, with modern releases coming out every 12 to 18 months. This can be wonderful or bad, depending on your approach. If you want cutting-edge features, a rapid release cycle is good. However, if your shop is more conservative, a DBMS that changes frequently can be difficult to support. A rapid release cycle will antecedent conservative organizations either to upgrade more frequently than they would dote or to live with outdated DBMS software that is unlikely to fill the same flush of uphold as the latest releases.
  • Reference customers. Will the DBMS vendor supply current user references? Can you find other users on your own who might provide more impartial answers? talk with current users to elicit issues and concerns you may fill overlooked. How is support? Does the vendor respond well to problems? outcome things generally travail as advertised? Are there a lot of bug fixes that must be applied continuously? What is the attribute of modern releases? These questions can be answered only by the folks in the trenches.
  • When choosing a DBMS, be sure to rob into account the complexity of the products. DBMS software is very intricate and is getting more intricate with each modern release. Functionality that used to be supported only with add-on software or independent programs is increasingly being added as features of the DBMS, as shown in figure 2.2. You will necessity to diagram for and uphold All the features of the DBMS. Even if there is no current requirement for sure features, once you implement the DBMS the programmers and developers will find a understanding to exhaust just about anything the vendor threw into it. It is better to diagram and be prepared than to allow features to be used without a diagram for supporting them.

    Figure 2.2

    Figure 2.2. Convergence of features and functionality in DBMS software

    DBMS Architectures

    The supporting architecture for the DBMS environment is very critical to the success of the database applications. One wrong choice or poorly implemented component of the overall architecture can antecedent poor performance, downtime, or unstable applications.

    When mainframes dominated enterprise computing, DBMS architecture was a simpler concern. Everything ran on the mainframe, and that was that. However, today the IT infrastructure is distributed and heterogeneous. The overall architecture—even for a mainframe DBMS—will probably consist of multiple platforms and interoperating system software. A team consisting of industry and IT experts, rather than a single person or group, should accomplish the final architecture decision. industry experts should embrace representatives from various departments, as well as from accounting and legal for software contract issues. Database administration representatives (DA, DBA, and SA), as well as members of the networking group, operating system experts, operations control personnel, programming experts, and any other interested parties, should be included in this team.

    Furthermore, be sure that the DBMS you select is commandeer for the nature and sort of processing you diagram to implement. Four levels of DBMS architecture are available: enterprise, departmental, personal, and mobile.

    An enterprise DBMS is designed for scalability and towering performance. An enterprise DBMS must be capable of supporting very great databases, a great number of concurrent users, and multiple types of applications. The enterprise DBMS runs on a large-scale machine, typically a mainframe or a high-end server running UNIX, Linux, or Windows Server. Furthermore, an enterprise DBMS offers All the “bells and whistles” available from the DBMS vendor. Multiprocessor support, uphold for parallel queries, and other advanced DBMS features are core components of an enterprise DBMS.

    A departmental DBMS, sometimes referred to as a workgroup DBMS, serves the middle ground. The departmental DBMS supports diminutive to medium-size workgroups within an organization; typically, it runs on a UNIX, Linux, or Windows server. The dividing line between a departmental database server and an enterprise database server is quite gray. Hardware and software upgrades can allow a departmental DBMS to tackle tasks that previously could be performed only by an enterprise DBMS. The steadily falling cost of departmental hardware and software components further contributes to lowering the total cost of operation and enabling a workgroup environment to scale up to serve the enterprise.

    A personal DBMS is designed for a single user, typically on a low- to medium-powered PC platform. Microsoft Access, SQLite, and FileMaker2 are examples of personal database software. Of course, the major DBMS vendors furthermore market personal versions of their higher-powered solutions, such as Oracle Database Personal Edition and DB2 Personal Edition. Sometimes the low cost of a personal DBMS results in a misguided attempt to elect a personal DBMS for a departmental or enterprise solution. However, outcome not be lured by the low cost. A personal DBMS product is suitable only for very small-scale projects and should never be deployed for multiuser applications.

    Finally, the mobile DBMS is a specialized version of a departmental or enterprise DBMS. It is designed for remote users who are not usually connected to the network. The mobile DBMS enables local database access and modification on a laptop or handheld device. Furthermore, the mobile DBMS provides a mechanism for synchronizing remote database changes to a centralized enterprise or departmental database server.

    A DBMS designed for one sort of processing may be ill suited for other uses. For example, a personal DBMS is not designed for multiple users, and an enterprise DBMS is generally too intricate for single users. be sure to understand the differences among enterprise, departmental, personal, and mobile DBMS software, and elect the commandeer DBMS for your specific data-processing needs. You may necessity to elect multiple DBMS types—that is, a DBMS for each level—with usage determined by the needs of each development project.

    If your organization requires DBMS solutions at different levels, favor the selection of a group of DBMS solutions from the same vendor whenever possible. Doing so will minimize differences in access, development, and administration. For example, favor Oracle Database Personal Edition for your single-user DBMS needs if your organization uses Oracle as the enterprise DBMS of choice.

    DBMS Clustering

    Clustering is the exhaust of multiple “independent” computing systems working together as a single, highly available system. A modern DBMS offers clustering uphold to enhance availability and scalability. The two predominant architectures for clustering are shared-disk and shared-nothing. These names outcome a wonderful job of describing the nature of the architecture—at least at a towering level.

    Shared-nothing clustering is depicted in figure 2.3. In a shared-nothing architecture, each system has its own private resources (memory, disks, etc.). The clustered processors communicate by passing messages through a network that interconnects the computers. In addition, requests from clients are automatically routed to the system that owns the resource. Only one of the clustered systems can “own” and access a particular resource at a time. In the event a failure occurs, resource ownership can be dynamically transferred to another system in the cluster. The main advantage of shared-nothing clustering is scalability. In theory, a shared-nothing multiprocessor can scale up to thousands of processors because they outcome not meddle with one another—nothing is shared.

    In a shared-disk environment, All the connected systems participate the same disk devices, as shown in figure 2.4. Each processor soundless has its own private memory, but All the processors can directly address All the disks. Typically, shared-disk clustering does not scale as well for smaller machines as shared-nothing clustering. Shared-disk clustering is better suited to large-enterprise processing in a mainframe environment. Mainframes—very great processors—are capable of processing huge volumes of work. powerful benefits can be obtained with only a few clustered mainframes, while many PC and midrange processors would necessity to be clustered to achieve similar benefits.

    Shared-disk clustering is usually preferable for applications and services requiring only modest shared access to data and for applications or workloads that are very difficult to partition. Applications with cumbersome data update requirements are probably better implemented as shared-nothing. Table 2.3 compares the capabilities of shared-disk and shared-nothing architectures.

    Table 2.3. Comparison of Shared-Disk and Shared-Nothing Architectures

    Shared-Disk

    Shared-Nothing

    Quick adaptability to changing workloads

    Can exploit simpler, cheaper hardware

    High availability

    Almost unlimited scalability

    Performs best in a cumbersome read environment

    Works well in a high-volume, read-write environment

    Data necessity not be partitioned

    Data is partitioned across the cluster

    The major DBMS vendors provide uphold for different types of clustering with different capabilities and requirements. For example, DB2 for z/OS provides shared-disk clustering with its Data Sharing and Parallel Sysplex capabilities; DB2 on non-mainframe platforms uses shared-nothing clustering. Oracle’s actual Application Clusters provide shared-disk clustering.

    For most users, the primary capitalize of clustering is the enhanced availability that accrues by combining processors. In some cases, clustering can back an enterprise to achieve five-nines (99.999 percent) availability. Additionally, clustering can be used for load balancing and failover.

    DBMS Proliferation

    As a rule of thumb, create a policy (or at least some simple guidelines) that must be followed before a modern DBMS can be brought into the organization. Failure to outcome so can antecedent a proliferation of different DBMS products that will be difficult to support. It can furthermore antecedent confusion regarding which DBMS to exhaust for which development effort.

    As mentioned earlier, there is a plethora of DBMS vendors, each touting its benefits. As a DBA, you will be bombarded with marketing and sales efforts that attempt to convince you that you necessity another DBMS. Try to resist unless a very compelling understanding is given and a short-term recrudesce on investment (ROI) can be demonstrated. Even when confronted with sound reasons and wonderful ROI, be sure to double-check the arguments and ROI calculations. Sometimes the reasons specified are outdated and the ROI figures outcome not rob everything into account—such as the additional cost of administration.

    Remember, every DBMS requires database administration support. Moreover, each DBMS uses different methods to accomplish similar tasks. The fewer DBMS products installed, the less complicated database administration becomes, and the better your chances become of providing effectual data management resources for your organization.

    Hardware Issues

    When establishing a database environment for application development, selecting the DBMS is only section of the equation. The hardware and operating system on which the DBMS will flee will greatly impact the reliability, availability, and scalability (RAS) of the database environment. For example, a mainframe platform such as an IBM zEC12 running z/OS will probably provide higher RAS than a midrange IBM xSeries machine running AIX, which in circle will probably exceed a Dell server running Windows. That is not to pronounce everything should flee on a mainframe; other issues such as cost, experience, manageability, and the needs of the applications to be developed must be considered. The bottom line is that you must be sure to factor hardware platform and operating system constraints into the DBMS selection criteria.

    Cloud Database Systems

    Cloud computing (see the sidebar) is increasing in usage, especially at diminutive to medium-size businesses. A cloud implementation can be more cost-effective than edifice an entire local computing infrastructure that requires management and support.

    A cloud database system delivers DBMS services over the Internet. The trade-off essentially comes down to trusting a cloud provider to store and manage your data in recrudesce for minimizing database administration and maintenance cost and effort. Using cloud database systems can enable organizations, especially smaller ones without the resources to invest in an enterprise computing infrastructure, to focus on their industry instead of their computing environment.

    By consolidating data sources in the cloud, it is workable to ameliorate collaboration among partners, fork offices, remote workers, and mobile devices, because the data becomes accessible as a service. There is no necessity to install, set up, patch, or manage the DBMS software because the cloud provider manages and cares for these administrative tasks. Of course, the downside is that your data is now stored and controlled by an external agent—the cloud provider. Another inherent risk of cloud computing is the possibility of nefarious agents posing as legitimate customers.

    An specimen of a cloud database platform is Microsoft SQL Azure. It is built on SQL Server technologies and is a component of the Windows Azure platform.



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