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How to diagnose compression ratio too lower on Exadata

edited Nov 26, 2014 6:25AM in Exadata General (MOSC) 4 comments

Experts,

          My customer's olap system based on Exadata full. there is a large table, partitioned by day. There is 10GB data each partition.DBA tried to compress partitions, and most compression ratio is more than 10. However, there are 2 partition cannot be compressed, and compression ratio is no more than 1.1 (before compress is 13GB, compressed is 12GB). I tried to execute dbms_compression.get_compression_ratio, and return 19. How to explain the situation? How to resolve?

Regards,

Jason

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