APAR status
Closed as program error.
Error description
If using compression on a table with varchars, and then doing an in place alter of the table, it's possible if readers are querying the table using committed read last committed while the table is being updated that the above assertion failures are possible for the sessions reading the table. The stack for the 2 assertions (for the rowalter): affail_interface rowalter rsseqscan_read fmseqscan_read readseq_batch gettupl scan_next next_row get_first_row_from_producer group_open prepselect open_cursor sql_open sq_open sqmain For the decompress row: affail_interface rsseqscan_read fmseqscan_read readseq_batch gettupl scan_next next_row get_first_row_from_producer group_open prepselect open_cursor sql_open sq_open sqmain Again for this to occur, the table being queried needs to be using compression, contain varchars, and have some in place alter being performed on it which would alter the rows size. Then the users querying the table need to be using committed read last committed isolation level. If the table is not using compression you can see the 2 following types of assertion failures instead: 13:23:07 Assert Failed: physical_scan: corrupted rowid = 1ce01, partnum = 100102 or 08:00:52 Assert Failed: construct_row: deleted rowid = 41c, partnum = 100102
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: * * users using last committed in 12.10 * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * Update to IDS-12.10.xC5 * ****************************************************************
Problem conclusion
Problem Fixed In IDS-12.10.xC5
Temporary fix
Comments
APAR Information
APAR number
IT03514
Reported component name
INFORMIX SERVER
Reported component ID
5725A3900
Reported release
C10
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2014-07-31
Closed date
2015-10-16
Last modified date
2015-10-16
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
INFORMIX SERVER
Fixed component ID
5725A3900
Applicable component levels
RA10 PSN
UP
RA10 PSY
UP
RB10 PSN
UP
RB10 PSY
UP
RB50 PSN
UP
RB50 PSY
UP
RB70 PSN
UP
RB70 PSY
UP
RC10 PSN
UP
RC10 PSY
UP
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Document Information
Modified date:
16 October 2015