PM70981: ADD DB2 BUFFER POOL STATISTICS COUNTERS TO IMPROVE ANALYSIS FOR PERFORMANCE ISSUES

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Changes to add three new buffer pool statistics counters to
  improve serviceability when analyzing DB2 performance issues.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All DB2 users.                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: Added new buffer pool statistics.       *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  New buffer pool statistics are added to help with
  performance analysis related to the buffers on the
  sequential least-recently-used (SLRU) chain.
  

Problem conclusion

• MSGDSNB411I for the -DISPLAY BUFFERPOOL(bufferpool_id) DETAIL
  has been modified to include the following:
  SEQUENTIAL - Number of buffers on the SLRU chain
  VPSEQT HIT - Number of times that the size of the SLRU chain
               reaches the VPSEQT for the buffer pool
  RECLASSIFY - A statistic that is used by IBM for serviceability
  
  The following fields are introduced in the IFCID 2 trace:
  1. QBSTSMIN
     Minimum number of buffers on the SLRU chain within a
     statistic interval.
  2. QBSTSMAX
     Maximum number of buffers on the SLRU chain within a
     statistic interval.
  3. QBSTHST
     Number of times that the size of the SLRU chain reaches the
     VPSEQT.
  4. QBSTRHS
     A statistic that is used by IBM for serviceability.
  

Temporary fix

Comments

• ž**** PE13/08/07 FIX IN ERROR. SEE APAR PM94435  FOR DESCRIPTION
  

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UK94096

Modules/Macros

• DSNB1BVP DSNB1CBP DSNB1DBP DSNB1DVP DSNB1GET
  DSNB1GWB DSNB1LRR DSNB1REL DSNB1RWI DSNB1TSD DSNDQBST DSNFBDIR
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RA10 PSY UK94096

     UP13/05/22 P F305

Fix is available

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