Exadata General (MOSC)

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July 16th "Exadata Hybrid Columnar Compression - Overview" Webcast Q&A Thread

edited Jul 23, 2014 3:53PM in Exadata General (MOSC) 1 comment

Q:  It has two block headers ?

A: No, there is only one block header. There is an additional bit that we maintain in block header that identify whether the block is part of CU or not.

Apart from this additional bit in block header there is no change in block structure.

Q:  in my observation - the best compression factor we can get with ORDER by in query - but Oracle did not write about that in documentation - why ?

A: In EHCC compression factor or compression ratio is determined by the level that is specified like Query HIGH/LOW or Archive HIGH/LOW.

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