Compressing partitions

We have several large 2-4 gig partitions on a 5 year basis. After a month or two, changes should be almost non-existent.  

They also have partitioned indexes. Just makes things easier when we roll off the oldest partition, etc.  

Is there a downside to compression?  

It's sounds like it's supposed to be more stable now, handling tables and indexes.  

While I've not found much, it seems like we could expect the 2-4 gig to maybe be 200-400 meg??? Even if 25-50% would not be bad given some of it is 5 years history.  

We are at 9.2.0.6.  

Michael Kline
Database Administration
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