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Index size increased after table compression

edited Mar 31, 2014 12:00PM in Database DataWarehousing (MOSC) 5 commentsAnswered

Hi All,

Good Morning!!

Database Release 11.2.0.3.0

I am using composite LIST_RANGE partitioned tables.The tables have millions of data. Unique and non Unique indexes are created on the tables which are LOCAL indexes.

After compressing the tables, the indexes size increased by 15% to 30%(ideally the space consumed should be decreased).

IndexBefore CompressionAfter Compression
Unique 8.02 GB9.39 GB
Non Unique2.59 GB3.25 GB

Can someone give some idea why it happened?

Any information required , please ask me.

Thanks in advance .

Vikash

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