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We're using SQL Server 2012 and have page compression turned on for a number of our larger tables. Is there a way we can determine the compression ratio we're getting? We'd like to be able to determine the benefits of compression.

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  • Can you afford creating non-compressed copies of compressed tables? By doing that, you can easily find the uncompressed size. Sure, it's unelegant but could work.
    – vonPryz
    Oct 14, 2013 at 12:54

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How about sp_estimate_data_compression_savings?

It allows you to estimate the gain from compression BEFORE you compress the table, but it's quite accurate.

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  • Yeah, I saw that but that is just an estimate. I wanted the actual compression ratio, if it's available. And, besides, we've already enabled compression on many of our tables.
    – Randy Minder
    Sep 20, 2013 at 14:43
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    @Randy: You can use that stored procedure to do what you want: use the parameter @data_compression = 'NONE'.
    – Jon Seigel
    Oct 14, 2013 at 19:10

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