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Informix - Problem description

Problem IT33796 Status: Closed

VIEW NOT RESPECTING SUBQUERY THEREFORE PRODUCING TOO MANY ROWS WHICH LEADS
TO LONGER RUNTIME OF THE QUERY

product:
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10
Problem description:
A view used in a select with a subquery does not apply subquery
when being created and therefore producing to many rows

Example:

select
...
where test_view.serial_vk in (select my_serial_1 from my_tab_1
where ....)

subquery is applied when using the view (which is slow)

3) (Temp Table For View): SEQUENTIAL SCAN

Filters:
Table Scan Filters: (Temp Table For View).serial_vk = ANY



subquery is applied when creating the view (which is fast)

  1) informix.my_tab_2: INDEX PATH

    (1) Index Name: informix.my_ind_2
        Index Keys: my_serial_2 (Key-Only) (Serial, fragments:
ALL)
        Lower Index Filter: informix.my_tab_2.my_serial = ANY
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.                                                   *
****************************************************************
This fix removes a previous restriction with SQL_DEF_CTRL bit
0x40000000, by default it's disabled.

steps to set SQL_DEF_CTRL
1) get the current SQL_DEF_CTL value
    onstat -g cfg SQL_DEF_CTRL
name                      current value
SQL_DEF_CTRL              0x44004b0

2) the new value to enable that bit
SQL_DEF_CTRL  |  0x40000000 =  0x444004b0

3) set with onmode or in ONCONFIG
onmode -wf SQL_DEF_CTRL=0x444004b0
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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