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Status Future consideration
Workspace Db2
Created by Guest
Created on Dec 15, 2015

BLU CDE Online REORG

Currently BLU CDE tables only have the RECLAIM EXTENTS option of REORG enabled. This does not physically move rows and therefore REORG cannot reclaim extents unless 100% of the rows in an extent have been deleted (via deletes or BLU updates). Also, synopsis rows don't get removed unless every row in a range of 1024 rows have been deleted (or updated)

A manual work-around whereby "dummy updates" are performed on ranges of rows on the base table is possible, but is neither elegant or particularly efficient.

The preferred solution would be for REORG be extended to look for extents or TSN ranges that have a significant percent of deleted tuples. REORG should then move the remaining live rows to the end of the table, to allows those extents to be reclaimed and/or synopsis rows to be removed.

Note that Development (the DB2-CE CDE Storage team) have been involved in the PMR with comments in CRM / RCT.
  • Guest
    Mar 10, 2021

    My client uses ADMIN_MOVE_TABLE on column org tables as a workaround for Reorg - they would also be happy with a more extensive REORG functionality.

  • Guest
    Mar 8, 2021

    Dubai Islamic Bank using IIAS raised similar concerns and opened PMRs complaining inefficient reclaim process that is resulting in inorganic storage consumption.

  • Guest
    Mar 8, 2021

    Our client - Eurobank - is asking for this.
    Their daily ETL process deletes chunks of data from specific target tables, resulting in sparse tables that grow in size. We need a "table defragment functionality" within the db2 REORG.