Re: Introduce a new view for checkpointer related stats

On Wed, Nov 30, 2022 at 5:15 PM Bharath Rupireddy
<bharath.rupireddyforpostgres@gmail.com> wrote:
>
> I don't have a strong opinion about changing column names. However, if
> we were to change it, I prefer to use names that
> PgStat_CheckpointerStats has. BTW, that's what
> PgStat_BgWriterStats/pg_stat_bgwriter and
> PgStat_ArchiverStats/pg_stat_archiver uses.

After thinking about this a while, I convinced myself to change the
column names to be a bit more meaningful. I still think having
checkpoints in the column names is needed because it also has other
backend related columns. I'm attaching the v4 patch for further
review.
CREATE VIEW pg_stat_checkpointer AS
    SELECT
        pg_stat_get_timed_checkpoints() AS timed_checkpoints,
        pg_stat_get_requested_checkpoints() AS requested_checkpoints,
        pg_stat_get_checkpoint_write_time() AS checkpoint_write_time,
        pg_stat_get_checkpoint_sync_time() AS checkpoint_sync_time,
        pg_stat_get_buf_written_checkpoints() AS buffers_written_checkpoints,
        pg_stat_get_buf_written_backend() AS buffers_written_backend,
        pg_stat_get_buf_fsync_backend() AS buffers_fsync_backend,
        pg_stat_get_checkpointer_stat_reset_time() AS stats_reset;

--
Bharath Rupireddy
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com