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MF64300 - OSP-DB-OTHER-F/SKGUARD-T/QDBGETMQO-MSGMCH3601 WHEN EXECUTING

PTF ( Program Temporary Fixes ) Cover letter


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Abstract

OSP-DB-OTHER-F/SKGUARD-T/QDBGETMQO-MSGMCH3601 WHEN EXECUTING


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED           PTF/FIX  LEVEL

TYPE PROGRAM  RELEASE   NUMBER   MIN/MAX  OPTION
---- -------- --------- -------  -------  ------
PRE  5770999  V7R3M0    MF63858   00/00    0000
PRE  5770999  V7R3M0    MF62223   00/00    0000
PRE  5770999  V7R3M0    MF60955   00/00    0000
CO   5770999  V7R3M0    MF63731   00/00    0000
CO   5770999  V7R3M0    MF61542   00/00    0000
CO   5770999  V7R3M0    MF61286   00/00    0000
CO   5770999  V7R3M0    MF61258   00/00    0000



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APAR Error Description / Circumvention

-----------------------------------------------
Jobs running SQL statements fail with MSGMCH3601 F/SkGuard
STMT/0013E8 T/QDBGETMQO STMT/2940. This is produced when an
internal structure (an SkGuard) reaches a limit of approximately
65 million active instances. Given some combinations of index
keys and query predicates, the SQL statistics engine may leak a
reference to these internal structures. Over time as queries are
optimized, the leak may cause the internal limit to be reached
and prevent any further SQL activity.

CORRECTION FOR APAR MA46720 :
-----------------------------
This fix eliminates the resource leak and prevents SQL activity
from halting due to the system reaching its internal limit.

CIRCUMVENTION FOR APAR MA46720 :
--------------------------------
None.


Activation Instructions


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Special Instructions


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Default Instructions

THIS PTF CAN BE APPLIED IMMEDIATE OR DELAYED.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
   MF63891      LIC-DB Internal Maintenance
   MF63797      LIC-DB-OTHER-PERFM Query runs slowly because it uses MTI ins
   MF63732      LIC-DB-OTHER-PERFM Improved optimization time for queries wi
   MF63729      OSP-DB-OTHER-PERFM INEFFICIENT MTI USED IN A PLAN
   MF62671      LIC-DB-OTHER-PERFM SQL STATEMENT CONTAINING A RCTE IS RE-OPT
   MF63726      LIC-DB-OTHER-PERFM Bad record count estimates for certain qu
   MF63589      OSP-DB-OTHER-PERFM DATA SKEW IN A JOIN CAUSED A SLOW PLAN TO
   MF63453      LIC-DB-PERFM FETCH FIRST ROW query over table runs slowly
   MF63409      LIC-DB-OTHER-PERFM IMPROVE DB ESTIMATE
   MF63404      OSP-PAR-940XMISC IMPROVE OPTIMIZER RECORD COUNT ESTIMATE OF
   MF62719      LIC-DB-OTHER-PERFM I/O statistics estimates cause poor query
   MF62598      LIC-DB-OTHER Improve statistic estimates for OLAP queries
   MF62036      LIC-DB-OTHER-UNPRED OLAP query with regression function fail
   MF62549      LIC-DB-OTHER-PERFM IMPROVE COSTING EVALUATION FOR AUX STORAG
   MF62444      OSP-PERFM ESTIMATES IN LARGE IN LIST CONVERSION TREES CAUSIN
   MF62437      LIC-DB Handle missing index during predicate checking on pla
   MF62235      LIC-DB Improvements to long EKR time tracking
   MF61819      LIC-DB Poor record count estimates in complex RRN AND/OR pla
   MF61785      LIC-DB-OTHER-PERFM Improved query optimizer costing for tabl
   MF61734      LIC-DB-OTHER Temporary storage may leak when running SQL que
   MF61663      LIC-DB-OTHER-PERFM SQE query may run slowly when OPTIMIZE FO
   MF61574      OSP-LOOP JOB LOOPING IN DBSTMDEXPRTREEADMIN
   MF61574      LIC-DB Add QRO hash in optimization trace for AQP/GCM estima
   MF61544      LIC-DB-OTHER Query with multiple OLAP functions fails with M
   MF61543      LIC-DB-OTHER Increase database random Input/Output initial b
   MF61427      LIC-DB-OTHER Failure when query predicate includes some OLAP
   MF61285      LIC-DB Offload long EKR estimates found during optimization
   MF61257      LIC-DB-OTHER-PERFM Stale column statistics not analyzed duri
   MF61257      LIC-DB-OTHER-PERFM Improved column statistics collection for
   MF61147      LIC-DB Improve optimizer estimate for partitioned tables wit
   MF61147      LIC-DB Estimate improvement for EOA plans with partitioned t

Summary Information

System.............................. i
Models..............................
Release............................. V7R3M0
Licensed Program............... 5770999
APAR Fixed.......................... View details for APAR MA46720
Superseded by:...................... View fix details for PTF MF65703
Recompile........................... N
Library............................. QSYS
MRI Feature ........................ NONE
Cum Level........................... C8025730


System i Support

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Document information

More support for: i family

Software version: V7R3M0

Operating system(s): OS/400

Reference #: MF64300

Modified date: 03 November 2017