Tsakiridis Orestis wrote:
Hi, I'm looking for a way to monitor all the queries that are executed by the server and to be able, by using these queries, to reproduce the data in all databases.
Beware - query shipping runs into problems with DELETE FROM my_table WHERE ts < now() > The idea is to periodicaly (e.g. every two
minutes) store the newly executed queries in a sort of wal segment file. I first tried to figure this out by monitoring the data in the wal file that is currently being updated (in the directory .../pg_xlogs). I hoped that it would be blank (filled with zeroes) from the last wal info inserted up to the end of the file. That was not the case. The wal files are recycled and the new wal info is written over the old one.
If the current PITR isn't good enough for you: http://www.postgresql.org/docs/8.1/static/backup.html Check that the changes in 8.2 beta aren't helpful http://www.postgresql.org/developer/beta
Finally, I also thought about placing a trigger in every table's update but this is far too complicated and cannot be applied to already functional database applications.
Have you looked at slony? http://gborg.postgresql.org/project/slony1/projdisplay.php The word you want to search on for all this is "replication". -- Richard Huxton Archonet Ltd
