digoal
2023-10-16
PostgreSQL , PolarDB , wait_event , 等待事件 , 检查点延迟
新增2个等待事件:
- CHECKPOINT_DELAY_COMPLETE "Waiting for a backend that blocks a checkpoint from completing."
- CHECKPOINT_DELAY_START "Waiting for a backend that blocks a checkpoint from starting."
Add wait events for checkpoint delay mechanism.
author Thomas Munro <tmunro@postgresql.org>
Fri, 13 Oct 2023 03:43:22 +0000 (16:43 +1300)
committer Thomas Munro <tmunro@postgresql.org>
Fri, 13 Oct 2023 03:43:22 +0000 (16:43 +1300)
commit 0013ba290b6684d095d93517ff2ca1fadf79bdb9
tree 19ee8a4489ce78072a07277260ec30be8bf24be3 tree
parent 7e1f544827ec843918f189765863269ff3a1c77e commit | diff
Add wait events for checkpoint delay mechanism.
When MyProc->delayChkptFlags is set to temporarily block phase
transitions in a concurrent checkpoint, the checkpointer enters a
sleep-poll loop to wait for the flag to be cleared. We should show that
as a wait event in the pg_stat_activity view.
Reviewed-by: Robert Haas <robertmhaas@gmail.com>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/CA%2BhUKGL7Whi8iwKbzkbn_1fixH3Yy8aAPz7mfq6Hpj7FeJrKMg%40mail.gmail.com
