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Informix - Problem description

Problem IT42497 Status: Closed

ERROR CODE -528 (MAXIMUM OUTPUT ROWSIZE (32767) EXCEEDED) IS THROWN WHEN
SQL IS RETURNING 17 MULTISETS

product:
INFORMIX SERVER / 5725A3900 / E10 - 
Problem description:
Error code -528: Maximum output rowsize (32767) exceeded is
thrown trying to execute an SQL statement having 17 multisets in
columns and not returning more than 32k in each row.

This select fails:
SELECT tabname,
       MULTISET(SELECT colno, colname FROM syscolumns WHERE 1=0)
col1,
       MULTISET(SELECT colno, colname FROM syscolumns WHERE 1=0)
col2,
       MULTISET(SELECT colno, colname FROM syscolumns WHERE 1=0)
col3,
       MULTISET(SELECT colno, colname FROM syscolumns WHERE 1=0)
col4,
       MULTISET(SELECT colno, colname FROM syscolumns WHERE 1=0)
col5,
       MULTISET(SELECT colno, colname FROM syscolumns WHERE 1=0)
col6,
       MULTISET(SELECT colno, colname FROM syscolumns WHERE 1=0)
col7,
       MULTISET(SELECT colno, colname FROM syscolumns WHERE 1=0)
col8,
       MULTISET(SELECT colno, colname FROM syscolumns WHERE 1=0)
col9,
       MULTISET(SELECT colno, colname FROM syscolumns WHERE 1=0)
col10,
       MULTISET(SELECT colno, colname FROM syscolumns WHERE 1=0)
col11,
       MULTISET(SELECT colno, colname FROM syscolumns WHERE 1=0)
col12,
       MULTISET(SELECT colno, colname FROM syscolumns WHERE 1=0)
col13,
       MULTISET(SELECT colno, colname FROM syscolumns WHERE 1=0)
col14,
       MULTISET(SELECT colno, colname FROM syscolumns WHERE 1=0)
col15,
       MULTISET(SELECT colno, colname FROM syscolumns WHERE 1=0)
col16,
       MULTISET(SELECT colno, colname FROM syscolumns WHERE 1=0)
col17
 FROM systables
 WHERE tabname="systables";
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 14.10.xC9W1.               *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 14.10.xC9W1.                      *
****************************************************************
To solve this in the least risky fashion, we've introduced an
undocumented, tunable onconfig parameter to allow the DBA to
control the collection memory allocation.  The default will
remain 20.

onstat -g cfg full ELEMS_PER_COLLECTION_MEM_ALLOC

IBM Informix Dynamic Server Version 14.10.FC10 -- On-Line -- Up
00:06:38 -- 168008 Kbytes
2022-12-08 18:19:36

Configuration Parameter Info

id   name                      type    maxlen   units   rsvd
tunable
278  ELEMS_PER_COLLECTION_MEM_ALLOC INT4    12
*

     min/max : 0,20
     default : 20
     onconfig:
     current : 1

     This parameter is undocumented.

     Description:
     Setting ELEMS_PER_COLLECTION_MEM_ALLOC influences an
internal memory
     allocation for queries that use collections. The default
value is 20 with
     acceptable value ranging from 0 through 20. If your query
encounters a
     -528 error, changing this value may resolve the error.
Local Fix:
Solution
Workaround
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 14.10.xC9W1.               *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 14.10.xC9W1.                      *
****************************************************************
To solve this in the least risky fashion, we've introduced an
undocumented, tunable onconfig parameter to allow the DBA to
control the collection memory allocation.  The default will
remain 20.

onstat -g cfg full ELEMS_PER_COLLECTION_MEM_ALLOC

IBM Informix Dynamic Server Version 14.10.FC10 -- On-Line -- Up
00:06:38 -- 168008 Kbytes
2022-12-08 18:19:36

Configuration Parameter Info

id   name                      type    maxlen   units   rsvd
tunable
278  ELEMS_PER_COLLECTION_MEM_ALLOC INT4    12
*

     min/max : 0,20
     default : 20
     onconfig:
     current : 1

     This parameter is undocumented.

     Description:
     Setting ELEMS_PER_COLLECTION_MEM_ALLOC influences an
internal memory
     allocation for queries that use collections. The default
value is 20 with
     acceptable value ranging from 0 through 20. If your query
encounters a
     -528 error, changing this value may resolve the error.
Comment
Fixed in Informix Server 14.10.xC9W1.
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
17.11.2022
17.02.2023
17.02.2023
Problem solved at the following versions (IBM BugInfos)
Problem solved according to the fixlist(s) of the following version(s)