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Informix - Problem description

Problem IT34509 Status: Closed

REDUCED PERFORMANCE POSSIBLE IN DR ENVIRONMENTS DUE TO CONTENTION ON
DRBT_LOCK MUTEX

product:
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10
Problem description:
Secondary servers having high levels of activity may experience
short periods of delay when sqlexec or log replay threads
perform a commit operation. Using the onstat command to collect
stack information for these threads an example is:

yield_processor_mvp
mt_lock_wait
mt_lock_helper
dr_ixrcommit
rscommit
sqiscommit
comwork
sql_nfetch
sq_nfetch
sqmain

The functions below rscommit are not relevant to this issue and
may vary according to the type of operation.

Running the command "onstat -g wmx" may also show one or more
threads waiting for the drbt_lock mutex. The wait times are of
very short duration so this may only be seen infrequently.

A primary server in an environment with only an HDR secondary
server may also show similar information.
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 12.10.xC15 and 14.10.xC5.  *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* Secondary servers having high levels of activity may         *
* experience                                                   *
* short periods of delay when sqlexec or log replay threads    *
* perform a commit operation. Using the onstat command to      *
* collect                                                      *
* stack information for these threads an example is:           *
*                                                              *
* yield_processor_mvp                                          *
* mt_lock_wait                                                 *
* mt_lock_helper                                               *
* dr_ixrcommit                                                 *
* rscommit                                                     *
* sqiscommit                                                   *
* comwork                                                      *
* sql_nfetch                                                   *
* sq_nfetch                                                    *
* sqmain                                                       *
*                                                              *
* The functions below rscommit are not relevant to this issue  *
* and                                                          *
* may vary according to the type of operation.                 *
*                                                              *
* Running the command "onstat -g wmx" may also show one or     *
* more                                                         *
* threads waiting for the drbt_lock mutex. The wait times are  *
* of                                                           *
* very short duration so this may only be seen infrequently.   *
*                                                              *
* A primary server in an environment with only an HDR          *
* secondary                                                    *
* server may also show similar information.                    *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 12.10.xC15 (when available) or    *
* 14.10.xC5.                                                   *
****************************************************************
Local Fix:
In an HDR-only environment setting the onconfig parameter
LOG_INDEX_BUILDS to 1 will avoid this problem on the primary
server. Note that enabling this parameter may lead to increased
usage of logical log space.
Solution
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
13.10.2020
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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