PH53568: RLA=Y CONNECTION POOLING ENHANCEMENT

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• Improve performance in a connection pooling environment by
  expanding the reuse of ACEEs in external subsystem (ESS) code.
  This builds on the RLA=Y enhancement that we delivered in
  PH33024 by expanding its scope to two exit routines within ESS.
  The RLA is the Region Level ACEE.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All IMS 15 customers using DB2 connection pooling and the    *
  * External Subsystem Attach Facility (ESAF) to send calls to   *
  * Db2.                                                         *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * Expand the scope of the RLA=Y option in a connection pooling *
  * environment to reduce overhead related to ACEE creation and  *
  * deletion.                                                    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * INSTALL CORRECTIVE SERVICE FOR APAR/PTF.                     *
  ****************************************************************
  Improve performance in a connection pooling environment by
  expanding the use of ACEEs in external subsystem (ESS) code.
  This builds on the RLA=Y enhancement delivered in PH33024 by
  expanding its scope to two exit routines within ESS.  With
  PH33024, when RLA=Y is specified for an Db2 entry in SSM=
  proclib member, the region level ACEE is passed to Db2 at ESS
  Signon if there is no ESAF_SIGNON_ACEE present and no TCB level
  ACEE present.  With PH53568, the region level ACEE will be
  passed at ESS Associate Thread and ESS Create Thread in addition
  to ESS Signon.
  
  When the region level ACEE is used, there is reduced overhead in
  the creation and management of ACEEs because the ACEE is created
  only once and is then available for future use.
  

Problem conclusion

• The ESS modules that set up the associate thread exit (DFSESAT0)
  and create thread exit (DFSESCT0) are modified to support the
  RLA=Y parameter.  If this parameter has been specified, then the
  setup module passes the Region Level ACEE to the exit.
  

Temporary fix

Comments

APAR Information

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

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

  UI93281

Modules/Macros

• DFSESAT0 DFSESCT0
  

Fix information

• Fixed component name

  IMS V15

• Fixed component ID

  5635A0600

Applicable component levels

• R500 PSY UI93281

     UP23/08/25 P F308

Fix is available

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