IT10350: STORAGE PROVISIONING ENABLED CAUSES UNNECESSARY CHUNK EXTENDS AND BLOATS CHUNKS WITH A LOT OF FREE SPACE

APAR status

• Closed as program error.

Error description

• When a dbspace has a chunk being extended, other threads that
  need space from that chunk
  will wait up to SP_WAITTIME to extend the same chunk with this
  stack on a table create for instance.
  
  (oninit)yield_processor_mvp
  (oninit)mt_yield
  (oninit)rsoutofspace
  (oninit)rspnbuild_sz
  (oninit)sqispnbuild
  (oninit)bldpartn
  (oninit)creatab
  (oninit)aud_creatab
  (oninit)excommand
  (oninit)sq_execute
  (oninit)sqmain
  (oninit)listen_verify
  (oninit)spawn_thread
  (oninit)th_init_initgls
  (oninit)startup
  
  If there are several threads that are waiting to extend the
  chunk, once they continue, they do
  not check to see if enough space exists after the extend that
  they were just waiting for that was
  issued by another thread.  So each thread that is waiting
  extends the chunk itself rather than
  using the new space.  Depending on activity this can bloat a
  chunk and use up a storage pool's
  available space in one swoop.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * storage provisioning                                         *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Update to IBM Informix Server 12.10.xC6                      *
  ****************************************************************
  

Problem conclusion

• Problem Fixed In IBM Informix Server 12.10.xC6
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  IFMX ULT WHSE E

• Fixed component ID

  IM0019BOS

Applicable component levels

• RC10 PSN

     UP