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Informix - Problem description

Problem IT33797 Status: Closed

MEMORY LEAK IN SQALLOC.C:1949 WHEN RUNNING JAVA PROG PERFORMING INSERTS &
UPDATES WHERE PLACEHOLDERS MATCH THE COMPOSITE INDEX

product:
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10
Problem description:
Situation: long running sessions which perform inserts and
updates.

If the where clause uses the columns of the composite index,
then a memory leak is observed.

This can be seen if the engine is started with "RALLOC_MODE
POOL" and the program paused every 1000 iterations â ¦

onstat -g mem | grep ^31
31.H.sdrebi  V     464d3040         4096             640
3          1
31*O0        V     463c9040         4096             768
1          1
31.H.ext     V     45e30040         8192             864
23         1
31.H.ext     V     46424040         16384            3392
42         1
31.H.sd      V     45f95040         16384            3640
45         2
31.H.sd      V     464e8040         274432           3280
2076       2
31           V     46459040         77824            4120
107        3
onstat -g afr 0x464e8040 | grep sqalloc.c:1949 | wc -l -> 2014

onstat -g mem | grep ^31
31.H.sdrebi  V     46451040         4096             640
3          1
31*O0        V     463c9040         4096             768
1          1
31.H.ext     V     45e30040         8192             864
23         1
31.H.ext     V     467f9040         16384            3392
42         1
31.H.sd      V     45f95040         16384            3640
45         2
31.H.sd      V     464e8040         2834432          3280
22076      2
31           V     46459040         77824            4120
107        3
onstat -g afr 0x464e8040 | grep sqalloc.c:1949 | wc -l -> 22014

onstat -g mem | grep ^31
31.H.sdrebi  V     46690040         4096             640
3          1
31*O0        V     463c9040         4096             768
1          1
31.H.ext     V     45e30040         8192             864
23         1
31.H.ext     V     46a06040         16384            3392
42         1
31.H.sd      V     45f95040         16384            3640
45         2
31.H.sd      V     464e8040         5394432          3280
42076      2
31           V     46459040         77824            4120
107        3
onstat -g afr 0x464e8040 | grep sqalloc.c:1949 | wc -l -> 42014

If the index is dropped, then the leak is not seen.

The memory is returned to the server if the session exits.
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 12.10.xC15 and 14.10.xC5.  *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 12.10.xC15 (when available) or    *
* 14.10.xC5.                                                   *
****************************************************************
Local Fix:
Solution
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
05.08.2020
22.01.2021
22.01.2021
Problem solved at the following versions (IBM BugInfos)
Problem solved according to the fixlist(s) of the following version(s)
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