| From: | rakeshkumar464 <rakeshkumar464(at)outlook(dot)com> |
|---|---|
| To: | pgsql-general(at)postgresql(dot)org |
| Subject: | Determining replication lag |
| Date: | 2016-12-02 15:26:20 |
| Message-ID: | 1480692380242-5933003.post@n3.nabble.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
I found the following SQL in stackoverflow:
SELECT
pg_last_xlog_receive_location() receive,
pg_last_xlog_replay_location() replay,
(
extract(epoch FROM now()) -
extract(epoch FROM pg_last_xact_replay_timestamp())
)::int lag
I get different result in primary and slave. On primary the col lag always
shows some number, usually more than 3000, but on slave it is always zero.
Why the discrepancy ?
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