Re: Correct query to check streaming replication lag
On Mon, Jan 20, 2014 at 1:53 PM, Granthana Biswas <granthana@zedo.com> wrote:
Yes we already do that. Count the number of ready wal files.
I guess a better place to check would be pg_stat_replication
Check this discussion:
Another way is explained in wiki:
$ psql -c "SELECT pg_current_xlog_location()" -h192.168.0.10 (primary host) pg_current_xlog_location -------------------------- 0/2000000 (1 row) $ psql -c "select pg_last_xlog_receive_location()" -h192.168.0.20 (standby host) pg_last_xlog_receive_location ------------------------------- 0/2000000 (1 row) $ psql -c "select pg_last_xlog_replay_location()" -h192.168.0.20 (standby host) pg_last_xlog_replay_location ------------------------------ 0/2000000 (1 row)
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