What do you mean by indentical here? does it mean that they are same in size, if that is true then yes they should be same in size unless you specify archive_timeout (8.2 config parameter) setting to do a log switch after certain amount of time.
and am interested in creating an incremental backup of WAL files, but my database is small so each of this WAL files must be almost identical to the previous one.
Is there a way to incrementally backup so that it takes less space?
thanks!
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