MySQL has information_schema.tables that contain information such as data_length or avg_row_length. Documentation on this table however is quite poor, making an assumption that those fields are self explanatory  they are not when it comes to tables that employ compression. And this is where inconsistency is born. Lets take a look at the same table [&]

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http://www.percona.com/blog/2014/10/10/mysql-compression-compressed-and-uncompressed-data-size/