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Problem IT37127
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Status: Closed |
A QUERY WILL CAUSE AN AF (POSSIBLY WITH -874) IF ANSI JOIN IS USED
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| product: |
INFORMIX SERVER / 5725A3900 / E10 - |
| Problem description: |
A query containing ANSI joins may cause a segmentation
violation, possibly with the error:
-874 General exception error has occurred in the optimizer.
ANSI joins typically have the form of:
[LEFT|RIGHT|FULL] [OUTER] JOIN tab1 ON tab1:col = tab2:col
... but it may be possible to direct the optimizer (+ ORDERED)
to use an ANSI join and achieve the same result.
A typical Linux x86_64 stack:
00000000014a5f2d
tos: 0x00000000445bc180
state: running
vp: 1
0x00000000014a5f2d (oninit) afstack
0x00000000014aae49 (oninit) afhandler
0x00000000014ab502 (oninit) affail_interface
0x00000000014abfca (oninit) mt_ex_throw_sig
0x00000000014ba1c8 (oninit) afsig_handler
0x00007f6802316b10 (Linux)
0x00000000009760e8 (oninit) op_join
0x00000000009798ad (oninit) op_phasejoin
0x000000000083c4f1 (oninit) sqoptim
0x0000000000a98fae (oninit) bldstructs
0x0000000000aa63da (oninit) sqcmd
0x0000000000aa68fd (oninit) sq_prepare
0x0000000000b8dc2e (oninit) sqmain
0x00000000015d5286 (oninit) spawn_thread
0x0000000001496903 (oninit) th_init_initgls
0x00000000014ddb2f (oninit) startup |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* Users of Informix Server prior to 12.10.xC15 and 14.10.xC7. *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to Informix Server 12.10.xC15 or 14.10.xC7 (when *
* available). *
**************************************************************** |
| Local Fix: |
To work around this problem, the following dynamic onconfig
change
may help:
onmode -wm OPT_ANSIJOIN_P1PRUNE=100 |
| Solution |
|
| Workaround |
****************************************************************
* USERS AFFECTED: *
* Users of Informix Server prior to 12.10.xC15 and 14.10.xC7. *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to Informix Server 12.10.xC15 or 14.10.xC7 (when *
* available). *
**************************************************************** |
| Comment |
Fixed in Informix Server 12.10.xC15 and 14.10.xC7. |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 04.06.2021
25.08.2021
25.08.2021 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
