Reclaimable Storage 可回收表空间

Reclaimable Storage : Usage, Hints, Tips

FYI : Why only new tablespaces ?

   • Index keys in existing tablespace point to data rows via their physical (tablespace-relative) addresses. Moving an extent of data to a new physical address, would render it's indexes unoperational

To avoid this issue, indexes in reclaimable storage tablespace have a changed format

   • Index keys in reclaimable storage tablespaces point to data rows via logical (table-relative) addresses

• Consider using the ADMIN_MOVE_TABLE() stored procedure to move tables to new reclaimable storage tablespaces while maximizing table availability

• REDUCE is online, but does consume storage bandwidth. If storage bandwidth consumption is a concern, consider:
        ALTER TABLESPACE <tsname> REDUCE STOP
then later, at a more convenient time,

       ALTER TABLESPACE <tsname> REDUCE MAX

<From DB2 Architecture for DBAs>