Re: what are the pg_clog and pg_xlog directories ?

pg_xlog contains Postgres Write Ahead Logs (WAL, Postgres
implementation of transaction logging) files (normally 16MB in size,
each).
pg_clog contains the commit log files which contain transaction commit
status of a transaction. One main purpose is to perform a database
recovery in case of a crash by replaying these logs.

----

Husam
http://firstdba.googlepages.com

-----Original Message-----
From: pgsql-novice-owner(at)postgresql(dot)org
[mailto:pgsql-novice-owner(at)postgresql(dot)org] On Behalf Of Joao Miguel
Ferreira
Sent: Friday, May 05, 2006 5:31 AM
To: pgsql-novice(at)postgresql(dot)org
Subject: [NOVICE] what are the pg_clog and pg_xlog directories ?

Hello all,

can anyone tell me what are the 'pg_xlog' e 'pg_clog' directories in
/var/lib/pgsql/data ?

thanks

joao

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