IT31708: LOB PAGES MAY NOT BE REUSED PROPERLY IN PURESCALE.

Db2 Version 11.1 Mod 4 Fix Pack 6 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 6 for Linux, UNIX, and Windows

APAR status

• Closed as program error.

Error description

• In pureScale environment, page reuse for LOBs is governed by
  internal readLSN. A deleted page can only be reused when the
  following are true: (a) delete is committed; (b) all readers
  that accessed the the page prior to deletion have been
  committed.
  
  If table function ADMIN_GET_TAB_INFO or ADMINTABINFO
  administrative view were called on a member that hasn't acceseed
  the <TARGET_TABLE>, this would cause this member to hold back
  the internal readLSN value for this <TARGET_TABLE>. This will
  cause db2 to not reuse the deleted pages of <TARGET_TABLE>
  properly even though the page is no longer in use.
  

Local fix

• Simply issue "SELECT * FROM <TARGET_TABLE> LIMIT 1" on every
  member. This will help refresh the global internal readLSN.
  Use above as temporary workarounds and contact IBM DB2 Support.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All                                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to fixpack inclusive of this APAR fix.               *
  ****************************************************************
  

Problem conclusion

• See APAR description
  

Temporary fix

Comments

APAR Information

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

  IT31697

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

Fix information

• Fixed component name

  DB2 FOR LUW

• Fixed component ID

  DB2FORLUW

Applicable component levels

• RB10 PSY

     UP

• RB50 PSY

     UP