Re: Logical replication data lag - Mailing list pgsql-admin
Hi ,
pglogical.show_subscription_status() provides useful information, it doesn't directly indicate replication lag. You can estimate replication lag using the apply_delay column, which shows the delay in applying the received changes.
The following view exists on the primary server and provides details about the state of replication to each connected replica. It includes the time difference between the current time and the last replayed transaction on the replica.
SELECT now() - pg_last_xact_replay_timestamp() AS time_lag FROM pg_stat_replication;
Regards,
pglogical.show_subscription_status() provides useful information, it doesn't directly indicate replication lag. You can estimate replication lag using the apply_delay column, which shows the delay in applying the received changes.
The following view exists on the primary server and provides details about the state of replication to each connected replica. It includes the time difference between the current time and the last replayed transaction on the replica.
SELECT now() - pg_last_xact_replay_timestamp() AS time_lag FROM pg_stat_replication;
Regards,
 |
Muhammad Imtiaz
PostgreSQL Technical Support Lead / Pakistan R&D
Mobile: +923345072521
Email: imtiaz.m@bitnine.net
On Wed, Jul 31, 2024 at 9:40 AM Siraj G <tosiraj.g@gmail.com> wrote:
Sorry, just wanted to make a little correction:I get the status report in the target as replicating when I query this:SELECT * FROM pglogical.show_subscription_status();But I do not know how to check the stats for this.Appreciate any help.On Wed, Jul 31, 2024 at 8:49 AM Siraj G <tosiraj.g@gmail.com> wrote:Hello Admins!I am trying to find the replication lag in the target that is being replicated using pglogical. I do not see any data in pg_stat_subscription. We are replicating data from GCP cloud SQL to a compute instance within the same VCN.I get the status report in the target as replication, but not sure why pg_stat_subscription does not show anything.Should I do it programmatically by creating a heartbeat table on the source, add it to the replication and monitor the data in this to get the report?Thanks in advance!RegardsSiraj
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