Translations:Manual:CompressOld.php/4/en

If used with option -t concat, it compresses only previous revisions of each page but keeps the current revision uncompressed. The texts of all previous revisions of each page are concatenated and saved to the first table record created for that page. The remaining intermediary records are converted into stubs pointing to that first record. The concatenation allows for better compression. (This is a simplified explanation; depending on page size and the options used, the resulting structure for a given page can be more complex than this after the script is run.)