On Fri, Aug 27, 2010 at 3:21 PM, tamanna madaan < tamanna.ma...@globallogic.com> wrote:
> Hi All > > Any idea about this problem ?? > > Thanks.. > Tamanna > > > -----Original Message----- > From: tamanna madaan > Sent: Fri 8/20/2010 11:54 AM > To: pgsql-general@postgresql.org > Subject: error while autovacuuming > > Hi All > > I am using a cluster setup with two nodes in it . postgres version is 8.1.2 > and slony 1.1.5 is being used for replication. > I have autovacuum enabled. But it was giving the following error while > vacuuming template0 database. > > 2010-08-18 18:36:14 UTC LOG: autovacuum: processing database "template0" > 2010-08-18 18:36:14 UTC ERROR: could not access status of transaction > 3222599682 > 2010-08-18 18:36:14 UTC DETAIL: could not open file "pg_clog/0C01": No such > file or directory > > Because of this error autovacuum is not able to process other databses in > postgres including my databse 'my_database'. > which is causing database to slow down. > > I googled about this problem and found that this may be because of some > data corruption. But I don't see any source of data corruption > in my database. Can anyone please let me know what could be causing this > error. We generally don't use template0 database. > So what could be causing this data corruption. > > Following below steps have solved the problem for now : > > 1. set 'datallowconn' to true for template0 database in pg_database > table. > 2. Stop postgres > 3. create a zero filled 0C01 file in /var/lib/pgsql/data/pg_clog folder. > 4. start postgres > 5. Execute `vacuum freeze` for all the databases i.e template0 , > template1, postgres and my_database > 6. set 'datallowconn' to false for template0 database in pg_database > table. > > But I doubt if the problem has been solved permanently or it can reapper > again. If it has been solved permanenlty then how. > I just created a zero filled 0C01 file of 256 K size. It doesn't have any > meaningful data. How this can resolve the problem permanently?? > > Please reply ... > > Thanks... > Tamanna > > Any chance you can upgrade your version to 8.4.x series? If I am not wrong, there has been a significant change in autovaccum between the versions. In case you cannot, I would still suggest you to update your version to 8.1.21 which should atleast cover any known bugs. With regards Amitabh
