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Status Future consideration
Workspace Db2
Components BLU Acceleration
Created by Guest
Created on Oct 10, 2022

RELATED IDEAS

Add REORG LONGLOBDATA for columnar tables

Currently we can create columnar tables with CLOB/LOB columns in it. What we can't do is reclaim the allocated diskspace of the CLOB/LOB columns (LOB_OBJECT_P_SIZE) in columnar tables

To get an idea about how many diskspace is allocated:

db2 "SELECT SUBSTR(TBSP_NAME, 1,30) AS TBSP_NAME, SUM(TBSP_USED_PAGES * TBSP_PAGE_SIZE)/ 1073741824 AS TBSP_USED_SIZE_GB, SUM((TBSP_PENDING_FREE_PAGES+ tbsp_free_pages) * TBSP_PAGE_SIZE)/ 1073741824 AS FREE_OR_PENDING_GB FROM TABLE(MON_GET_TABLESPACE('',-2)) where TBSP_NAME not like '%SYS%' and TBSP_NAME not like '%TEMP%' and RECLAIMABLE_SPACE_ENABLED = 1 and (TBSP_PENDING_FREE_PAGES+ tbsp_free_pages) >= 1 GROUP BY TBSP_NAME ORDER BY 3 DESC"

our case:

We implemented the DB2 audit audit facility. The allocated diskspace in the audit.execute was > 1.5TB. We need to store the statement executions for 30 days and after this we can deleted the records. because the can't REORG the columnar tables we can't "REORG TABLE <table name> LONGLOBDATA" we can't reclaim te storage easly


Workaround: we use the row oriented tables





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