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Informix - Problem description

Problem IT33917 Status: Closed

CONTINOOUS PREPARE/DECLARE/FREE OF AN STATEMENT IN AN FOREACH LOOP IN SPL
CAUSE A LINEAR MEMORY CONSUMPTION IN SESSION RALLOC

product:
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10
Problem description:
When I have the following logic in an Stored Procedure

create procedure sp ()

foreach select into val1, val2 -- select returns 15 Mio ++ rows
       let variable = string|| string || string || val1 ||
string .... || val2
       prepare ID from variable
       declare cursor on ID
...
       free cursor
       free ID
end foreach

end procedure;

and execute this SP, it will continoously growth on sessions
RALLOC part until SHMTOTAL or
systems available memory.
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 12.10.xC15 and 14.10.xC5.  *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* When the following logic is in a Stored Procedure:           *
*                                                              *
* create procedure sp ()                                       *
*                                                              *
* foreach select into val1, val2 -- select returns 15 Mio ++   *
* rows                                                         *
*        let variable = string|| string || string || val1 ||   *
* string .... || val2                                          *
*        prepare ID from variable                              *
*        declare cursor on ID                                  *
* ...                                                          *
*        free cursor                                           *
*        free ID                                               *
* end foreach                                                  *
*                                                              *
* end procedure;                                               *
*                                                              *
* and the stored procedure is executed, it will continuously   *
* growth in a sessions                                         *
* RALLOC part until SHMTOTAL or the systems available memory.  *
****************************************************************
* 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       :
14.08.2020
04.02.2021
04.02.2021
Problem solved at the following versions (IBM BugInfos)
Problem solved according to the fixlist(s) of the following version(s)
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