IT21460: DB2_FMP_COMM_HEAPSZ VALUES GREATER THAN 1GB NOT HONORED

Db2 Version 11.1 Mod 3 Fix Pack 3 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod3 Fix Pack3 iFix001 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod3 Fix Pack3 iFix002 for Linux, UNIX, and Windows

APAR status

• Closed as program error.

Error description

• If the DB2_FMP_COMM_HEAPSZ is set to greater than 1GB size (
  ~250,000 pages ), its silently set to a value of ~1GB.
  
  In highly concurrent environments where the FMP infrastructure
  is used extensively ( such as Federation ), this can cause "Out
  of memory" errors and subsequent crash of the FMP threads. This
  happens even when the registry var is set to a higher value than
  1GB.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * ALL                                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * Even after setting DB2_FMP_COMM_HEAPSZ to a size greater     *
  * than 1GB ( 250,000 pages ) it is silently limited to 1GB.    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to DB2 v111m1fp2                                     *
  ****************************************************************
  

Problem conclusion

• Fixed in DB2 v111m1fp2
  

Temporary fix

Comments

APAR Information

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

  IT10822

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

  IT36093

Fix information

• Fixed component name

  DB2 FOR LUW

• Fixed component ID

  DB2FORLUW

Applicable component levels

• RB10 PSN

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