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Yes, they are. shared_buffers is block-oriented, and stored in the same format as on-disk. This is generally good for performance, since the decompression is very fast, and the compression means that more fits in shared_buffers. The only case it might hurt is if you have enough storage to fit the whole dataset in shared_buffers uncompressed too.


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For the portion of the question asking about compression, Dave is correct on the trade off. I would investigate adding more capacity to your system before you head down the road of compression. For the partition portion the answer is going to be it depends. Partitioning takes a lot of planning and analysis of your current queries before you can measure ...



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