We are having a huge database and need replication with load balancing for
Postgres 9.0
We have chose Log shipping method for replication and trying out that approach.
Based on the method given for Log shipping, I have configured the following
On Master server the following parameters are set
wal_level = 'archive'
archive_mode = on
archive_command = <scp %p $STANDBYNODE:$PGARCHIVE/%f>
archive_timeout = 30
Started taking backup using :
select pg_start_backup('base backup for log shipping')
Then the data files excluding the pg_xlog are copied to the slave using rsync
rsync -cva --inplace --exclude=*pg_xlog* \${PGDATA}/ $STANDBYNODE:$PGDATA
Then the backup process is stopped using the following:
select pg_stop_backup(), current_timestamp
Recovery parameter in the slave server are set as followS
standby_mode = 'on'
restore_command = <cp $PGARCHIVE/%f %p>
archive_cleanup_command = <pg_archivecleanup $PGARCHIVE %r>
trigger_file = </tmp/postgresql.trigger.5432>
Replication is taking place. THe log in the slave server is showing that the
pg_xlog files
from master server are being copied and applied.
But these files are getting copied continuously and they are not stopping.
Master is generating pg_xlog files even when there is no activity on the
database.
and the slave server is continuously applying these new files depening on the
time set in checkpoint_timeout parameter of the master
PGADMIN is throwing a message' Database is starting up' when trying to connect
to the slave database.
When I shut down database servers on both machines, and then log into the slave
server after removing the recover.conf file, then
the slave server is started with the data already replicated from master server/
But can you please let me know how the two servers can be online and still the
replication continue via log shipping?
Regards
Jahnavi
________________________________
DISCLAIMER:
This email may contain confidential information and is intended only for the
use of the specific individual(s) to which it is addressed. If you are not the
intended recipient of this email, you are hereby notified that any unauthorized
use, dissemination or copying of this email or the information contained in it
or attached to it is strictly prohibited. If you received this message in
error, please immediately notify the sender at Infotech or
mail.ad...@infotech-enterprises.com and delete the original message.
