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Status Future consideration
Workspace Db2
Components Serviceability
Created by Guest
Created on Feb 12, 2015

Turn on reclaimable storage without dropping/recreating the tablespaces

After a migration from db2 9.5 to 10.1, several days passed, and we reached the maximum size of a DMS tablespace of 4K.

We moved one table to a different tablespace, but still noticed that the free pages were equal to 0.

We tried to execute the alter tablespace with the option reduce max and found that the space was not reclaimable:

db2 "SELECT varchar(tbsp_name, 30) as tbsp_name, tbsp_type, RECLAIMABLE_SPACE_ENABLED FROM TABLE(MON_GET_TABLESPACE('',-2))"

TBSP_NAME TBSP_TYPE RECLAIMABLE_SPACE_ENABLED
------------------------------ ---------- -------------------------
SYSCATSPACE DMS 0
STEMP04K01 SMS 0
USERSPACE1 DMS 0
DATA04K01 DMS 0
INDEX04K01 DMS 0
UTEMP04K01 SMS 0
LONG32K01 DMS 0
SYSTOOLSPACE DMS 1
DATA16K01 DMS 1
STEMP16K01 SMS 0
NADATA04K01 DMS 1
NAINDEX04K01 DMS 1
INDEX04K02 DMS 1
DATA04K02 DMS 1
LONG32K02 DMS 1
DATA04K03 DMS 1
INDEX04K03 DMS 1

17 record(s) selected.

We asked the db2 specialist about this limitation, but it seems there is no way to change this attribute dynamically.

We have around 400 databases which were migrated from version 9.5 to version 10.1, this implicates such a huge amount of work if we need to drop and recreate the table spaces in order to make this feature available for them.

Reference: http://www-01.ibm.com/support/docview.wss?uid=swg21438047