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r14 - 2013-05-31 - 16:54:52 - Main.premingYou are here: TWiki >  Deployment Web > DeploymentConfiguringAndTuning > ConfiguringAndTuningDB2

uc.png Tuning DB2

Authors: DanToczala
Build basis: CLM 2012, CLM 2011

Initial Assessment

Database Tuning is outside of the scope of the Jazz Administrator. Any information contained below is for reference only and should be passed on to your D.B.A.

When discussing the tuning of DB2, it is important to be aware of the differences between the various types of DB2. There is DB2 Workgroup, DB2 Enterprise, and DB2 for z/OS. Jazz licensing currently provides an entitlement for the use of the DB2 Workgroup edition.

DB2 Express is also supported, but it should NEVER be used for anything other than a product demo, pilot project, or functionality review. It will not scale to support a typical user load.

DB2 for z/OS

Most DB2 customers will turn on the following monitoring and tracing for their Jazz supporting DB2 instance on zOS:

TNO TYPE CLASS DEST QUAL IFCID
01 STAT 01,03,04,05, SMF NO  
01   06      
02 ACCTG 01,02,03,07, SMF NO  
02   08      
04 MON 01,02,03,05, OP1 NO  
04   07, 08      

What does all of this mean?

  • For statistics, monitor classes 1, 3, 4, 5 and 6. This shows overall health.
  • For accounting purposes, monitor classes 1, 2, 3, 7 and 8. This gets into more specifics about what is happening.
  • For monitoring purposes, monitor classes 1, 2, 3, 5, 7 and 8.

When working with DB2 you should be doing a RUNSTATS [multi-table, multi-index] whenever you make any changes to the DB2 database. It should then be done by the database administrator on a regular basis, to make sure that DB2 performs efficiently.

If this doesn’t work, you might want to increase MAX_R_BLOCK in the zOS parameters.

Note: A good DB2 Administrator will want to create indexes based on the results from some of the monitoring and the RUNSTATS commands. They can do this, but make sure that you measure database performance both before and after doing this, so you can determine it's impact on your performance.

DB2 Enterprise

todo16.png Need real tuning examples here

DB2 Workgroup

todo16.png Need real tuning examples here

Related topics: Deployment troubleshooting, Deployment monitoring

External links:

System requirements

Additional contributors: None

Questions and comments:

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