June 2018
Intermediate to advanced
478 pages
10h 52m
English
Content preview from IBM Db2 11.1 Certification Guide
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BLU disk space management
Db2 performs what is called logical deletion of rows. This is different from pseudo deletion, because in logical deletion, the space occupied by the deleted row on the data page can be overwritten with an inserted row. Pseudo deleted rows are not available until additional cleanup operations are performed.
For column-organized tables, data is pseudo deleted; for row organized tables, it is logically deleted. Thus, for column-organized tables, space reclaims are performed at the extent level, and the extent space is returned to the table space for use with any defined table.
To reclaim extents, execute a REORG command:
REORG TABLE CUSTOMER RECLAIM EXTENTS;
The storage extents whose pages held data that was completely ...
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