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MF63831 - OSP-DB-OTHER FILE WITH AUX SPACE BECOMES DAMAGED.

PTF ( Program Temporary Fixes ) Cover letter


Order this fix

Abstract

OSP-DB-OTHER FILE WITH AUX SPACE BECOMES DAMAGED.


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED           PTF/FIX  LEVEL

TYPE PROGRAM  RELEASE   NUMBER   MIN/MAX  OPTION
---- -------- --------- -------  -------  ------
PRE  5770999  V7R2M0    MF59242   00/00    0000
CO   5770999  V7R2M0    MF58264   00/00    0000
CO   5770999  V7R2M0    MF58265   00/00    0000
CO   5770999  V7R2M0    MF57744   00/00    0000
CO   5770999  V7R2M0    MF57745   00/00    0000
CO   5770999  V7R2M0    MF59665   00/00    0000



NOTICE:
-------
Application of this PTF may disable or render ineffective programs that
use system memory addresses not generated by the IBM translator,
including programs that circumvent control technology designed to limit
interactive capacity to purchased levels.  This PTF may be a prerequisite
for future PTFs.  By applying this PTF you authorize and agree to the
foregoing.

This PTF is subject to the terms of the 'IBM License Agreement for Machine
Code', the terms of which were provided in a printed document that was
delivered with the machine.

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INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OR CONDITIONS OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON INFRINGEMENT,
REGARDING THE PTF.





APAR Error Description / Circumvention

-----------------------------------------------
When a file contains large variable length fields (BLOB, CLOB,
etc) and there is one or more jobs reading from the file at the
same time one or more jobs are inserting into the end of the
file, it is possible that one of the reader jobs may detect a
mismatch between the fixed length portion of the record and the
variable length portion of the record.  This occurs because, in
rare instances in the insert path, the code determines that it
needs to extend an internal structure housing location
information.  Unfortunately the serialization used when
extending this structure is not sufficient enough to prevent a
reader job from seeing the structure in flux, thus causing the
mismatch.  This results in a read error, a 0600 5EED vlog, and
the file being marked damaged.  Although in actually, if the
read is tried again to the same record, it will be successful.

It should be noted that no data is lost or corrupted and all
records can be read successfully and correctly once the internal
structure is no longer in flux.  The file is not actually
damaged and was marked damage in error.

CORRECTION FOR APAR MA46475 :
-----------------------------
This PTF enforces more strict serialization when these internal
structures are being extended so that NO other job or task will
see the structures while they are in flux, thus a reader job
would neve find the structure in flux and would find the correct
VL data.

As noted in the problem description When the structure is not in
flux, all reads are correct and successful.  The file was marked
damaged in error.  However, this PTF will NOT unmark the file.
Service must be contacted to have the damage indication
reversed.

CIRCUMVENTION FOR APAR MA46475 :
--------------------------------
None.


Activation Instructions


None.




Special Instructions


None.


Default Instructions

THIS PTF CAN BE APPLIED IMMEDIATE OR DELAYED.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
   MF63256      LIC-DB performance improvement accessing force bitmap
   MF63036      LIC-DB excessive 06004C31 vlogs
   MF62920      OSP-F/#DBUPDIM-T/QDBUDR-MSGMCH4801 APPLY JOB FAILS WITH MCH4
   MF62875      OSP-DB Database Initialization (SLIC) IPL/Vary-on step perfo
   MF62809      OSP-DB A JOB MAY CREATE MANY THREADS (THOUSANDS) IF CQE USES
   MF62694      OSP SLIC DB vary-on diagnostics
   MF62538      OSP-DB SLIC DB Internal Maintenance for LOB processing of Au
   MF62276      LIC-DB Future release compatibility changes
   MF62266      LIC-DB Future release compatibility changes
   MF61858      OSP-DB Performance scaling (cache line) #dbscblk
   MF61603      OSP-DB Performacne scaling (cache line) #dbreten
   MF60500      OSP-PERFM LARGE AMOUNTS OF READS ON FILE CAN CAUSE EXCESSIVE
   MF57748      LIC-DB Prevent masked constraint Enablement
   MF59003      LIC-DB-OTHER-WAIT LONG SEIZE HOLD ON CQE QUERY
   MF58262      OSP-DB-OTHER-T/QTNDTCOBX/01E8-MSGMCH6204 RPGSQL PGM FAILS WI
   MF57845      LIC-DB DBL3 tasks causing seize contention
   MF62265      OSP-PAR B6001215
   MF61465      LIC-DB-OTHER-SRCB6005121-UNPRED SYSTEM HALT DURING NORMAL OP
   MF61372      OSP-DB Database Create Temp OMLOBB Data Space Improvements
   MF61164      OSP-DB-OTHER-THREADS-PERFM RESTORE FAILS WITH MCH1604
   MF61008      LIC-DB Reduce DB Recovery time on vary-on after flash copy
   MF60886      LIC-DB Force recycled Aux pieces at close
   MF60838      OSP-F/#DBDELIM-T/QDBUDR-RC1716-MSGMCH3203 RGZPFM WITH ALWCAN
   MF60711      LIC-DB VL06005EED for very large files
   MF60612      LIC-DB 06005D60 vlogs during massive delete of records
   MF60466      OSP-INCORROUT WHEN INTERNAL STRUCTURES ARE INCORRECT AND DEL
   MF60262      LIC-DB Prevent Performance issue caused by repeated rebuild
   MF59833      OSP-MSGCPF8111 WHEN SAVING A FILE AFTER UPGRADE TO 7.2, FILE
   MF59668      LIC-DB Set last used VL storage at IPL.
   MF59619      OSP-DB-OTHER-F/#DBGETAX-T/QDBPUT-MSGMCH3203 A MSGMCH3203 MAY
   MF59611      OSP-MSGCPF8111 PARTIAL DAMAGE ON FILE MEMBER WHEN PERFORMING
   MF59333      LIC-DB Prevent rebuild of internal recycle index
   MF58535      LIC-DB LOG 06005D60 vlogs
   MF57837      LIC-DB V720. Backup is (either) hung or taking exccessively
   MF59252      OSP-DB looping QClnSysLog job in database I/O (delete operat
   MF62201      OSP-DB Internal performance improvements for cpyf, alter tab
   MF61363      OSP-DB Database Insert Processing Improvements
   MF61325      OSP-DB-MSGMCH3402 F/T stringHighUse/QDBFEOD is returned when
   MF60721      OSP-DB-OTHER-F/#DBGETAXX/1716-T/QDBPUTMX/0702-MSGMCH3203 ALT
   MF59709      OSP-DB-OTHER-F/DBMAPV2F-T/QDBUDR-MSGMCH3203 A MSGMCH3203 MAY
   MF59670      OSP DB MCH3203 f/#dbentad t/QDBPUT with VL02001716 from #dbe
   MF59601      OSP DB MCH3203 f/#dbentad t/QDBPUT with VL02001716 from #dbe
   MF59296      OSP-DB-OTHER-INCORROUT A SAVE-WHILE-ACTIVE WHILE A RGZPFM IS
   MF58263      OSP- CPF5079 Number of locks under commit in job exceeds lim
   MF58040      OSP- Internal maintenance
   MF57987      OSP-DB-OTHER-UNPRED SELECT FROM INSERT STATEMENT CAUSES INDE
   MF57746      LIC-DB Prevent masked constraint Enablement

Summary Information

System.............................. i
Models..............................
Release............................. V7R2M0
Licensed Program............... 5770999
APAR Fixed.......................... View details for APAR MA46475
Superseded by:...................... View fix details for PTF MF66262
Recompile........................... N
Library............................. QSYS
MRI Feature ........................ NONE
Cum Level........................... C7290720


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Document information

More support for: i family

Software version: V7R2M0

Operating system(s): OS/400

Reference #: MF63831

Modified date: 18 July 2017