| From: | "myungkyu(dot)lim" <myungkyu(dot)lim(at)samsung(dot)com> |
|---|---|
| To: | "'Surafel Temesgen'" <surafel3000(at)gmail(dot)com> |
| Cc: | "'PostgreSQL Hackers'" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | RE: [Todo item] Add entry creation timestamp column to pg_stat_replication |
| Date: | 2018-11-15 05:10:21 |
| Message-ID: | 003001d47ca1$8282dc20$87889460$@samsung.com |
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| Thread: | |
| Lists: | pgsql-hackers |
Hi.
Thanks for your feedback.
> Can you explain the purpose of this feature more because now we have columns to report replication delay times like write_lag ,flush_lag and replay_lag that can use for similar purpose .
I think, time elapsed stats are very useful on DML query active system,
but not present that stats on idle system - not query, or only select.
sent_lsn | 0/5476C88
write_lsn | 0/5476C88
flush_lsn | 0/5476C88
replay_lsn | 0/5476C88
write_lag | 00:00:00.000055
flush_lag | 00:00:00.000855
replay_lag | 00:00:00.000914
sync_priority | 0
sync_state | async
last_msg_send_time | 2018-11-15 14:04:39.65889+09
state | streaming
sent_lsn | 0/5476CC0
write_lsn | 0/5476CC0
flush_lsn | 0/5476CC0
replay_lsn | 0/5476CC0
write_lag |
flush_lag |
replay_lag |
sync_priority | 0
sync_state | async
last_msg_send_time | 2018-11-15 14:05:02.935457+09
state | streaming
sent_lsn | 0/5476CC0
write_lsn | 0/5476CC0
flush_lsn | 0/5476CC0
replay_lsn | 0/5476CC0
write_lag |
flush_lag |
replay_lag |
sync_priority | 0
sync_state | async
last_msg_send_time | 2018-11-15 14:06:23.128947+09
This timestamp column is useful when react interval check and debugging on idle system.
Best regards,
Myungkyu, Lim
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