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MF60563 - LIC-DB-UNPRED Plan cache snapshot may cause unpredictable be

PTF ( Program Temporary Fixes ) Cover letter


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Abstract

LIC-DB-UNPRED Plan cache snapshot may cause unpredictable be


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED           PTF/FIX  LEVEL

TYPE PROGRAM  RELEASE   NUMBER   MIN/MAX  OPTION
---- -------- --------- -------  -------  ------
CO   5770999  V7R2M0    MF60482   00/00    0000
CO   5770999  V7R2M0    MF60463   00/00    0000
CO   5770999  V7R2M0    MF58821   00/00    0000
CO   5770999  V7R2M0    MF58635   00/00    0000
CO   5770999  V7R2M0    MF58458   00/00    0000



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APAR Error Description / Circumvention

-----------------------------------------------
After a plan cache snapshot or referencing a live plan through i
Navigator, seeing various corruption problems including vlogs
and gating problems on the plan cache.

CORRECTION FOR APAR MA44842 :
-----------------------------
During plan cache snapshot there was a small timing window where
after the plan was found in the plan cache but before all the
records had been written to the plan cache table, the plan could
be deleted from the plan cache but the host variables used for
the query were still being referenced.  This had the potential
to corrupt storage.  The problem has been corrected.

CIRCUMVENTION FOR APAR MA44842 :
--------------------------------
None.


Activation Instructions


None.




Special Instructions


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Default Instructions

THIS PTF CAN BE APPLIED IMMEDIATE OR DELAYED.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
   MF60484      LIC-DB-OTHER-UNPRED QUERY/400 MAY USE LARGE AMOUNTS OF TEMPO
   MF60462      LIC-DB-UNPRED 0600 BADD vlogs during Plan cache snapshot
   MF59749      LIC-DB-OTHER-UNPRED STORED PROCDURE DUMP_PLAN_CACHE_TOPN
   MF59063      LIC-DB-OTHER-PERFM AQP RE-OPTIMIZATION RESULTS IN A SLOWER R
   MF58822      LIC-DB-OTHER-PERFM SLOW PARTITION DUE TO CONCURRENT IDENTICA
   MF58822      LIC-DB-OTHER-PERFM SLOW PARTITION DUE TO CONCURRENT IDENTICA
   MF58809      LIC-DB-OTHER-MSGMCH3601 F/DBOPPLANRUNTIMEINFO SQL TRIGGERS F
   MF58633      LIC-DB-OTHER Internal maintenance
   MF58546      OSP-DB-OTHER dump the input QRO in an SQE DBOP errors trace
   MF58456      OSP-DB-Other Enable additional Plan Cache Properties and opt
   MF57851      LIC-DB Internal Maintenance
   MF57933      LIC-DB Internal Maintenance

Summary Information

System.............................. i
Models..............................
Release............................. V7R2M0
Licensed Program............... 5770999
APAR Fixed.......................... View details for APAR MA44842
Superseded by:...................... View fix details for PTF MF65828
Recompile........................... N
Library............................. QSYS
MRI Feature ........................ NONE
Cum Level........................... C6127720


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Document information

More support for: i family

Software version: V7R2M0

Operating system(s): OS/400

Reference #: MF60563

Modified date: 06 October 2015