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MF63832 - OSP-DB-OTHER FILE WITH AUX SPACE BECOMES DAMAGED.

PTF ( Program Temporary Fixes ) Cover letter


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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
---- -------- --------- -------  -------  ------
NONE



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.

SUBJECT TO ANY WARRANTIES WHICH CAN NOT BE EXCLUDED OR EXCEPT AS EXPLICITLY
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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
--------------  ------------------------------------------------------------
   MF62921      OSP-F/#DBUPDIM-T/QDBUDR-MSGMCH4801 APPLY JOB FAILS WITH MCH4
   MF62339      OSP-DB Job locks on ENDDBMON, can't endjob or endjobabn, mus
   MF62202      OSP-DB Internal performance improvements for cpyf, alter tab
   MF61944      OSP-DB SLIC DB Maintenance
   MF61166      LIC-DB-MSGMCH3203 f/#dbinsim
   MF61802      LIC-DB Future release compatibility changes
   MF61364      OSP-DB Database Insert Processing Improvements
   MF61326      OSP-DB-MSGMCH3402 F/T stringHighUse/QDBFEOD is returned when
   MF61057      LIC-DB-OTHER-UNPRED Internal Database Maintenance
   MF60988      OSP-F/#DBDELIM-T/QDBUDR-RC1716-MSGMCH3203 RGZPFM WITH ALWCAN
   MF61044      OSP-DB-OTHER-F/#DBXPUSH-T/QDBPUT-MSGMCH3203 CPF5257 F/QDBSIG

Summary Information

System.............................. i
Models..............................
Release............................. V7R3M0
Licensed Program............... 5770999
APAR Fixed.......................... View details for APAR MA46475
Superseded by:...................... View fix details for PTF MF66263
Recompile........................... N
Library............................. QSYS
MRI Feature ........................ NONE
Cum Level........................... C7283730


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Document information

More support for: i family

Software version: V7R3M0

Operating system(s): OS/400

Reference #: MF63832

Modified date: 18 July 2017