June 2018
Intermediate to advanced
478 pages
10h 52m
English
Content preview from IBM Db2 11.1 Certification Guide
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BLU compression and statistics
Compression efficiency is at the heart of BLU performance. Each columnar table has a column compression dictionary made up of small symbols representing repeated bytes of data. The dictionaries are of fixed size, so there is a limited number of slots. Populating these slots with a valid representation of the data in the table is important. Text data generally compresses better than numeric and random values; those from encryption would result in poor compression results. Compression and statistics collection are automatic.
If implementing data at rest encryption, it is best to perform compression before encryption. You should expect lower disk storage savings resulting from compression because of encryption. ...
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