database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-27 12:41:57 +03:00
Code Activity

Remove buffers_backend and buffers_backend_fsync from pg_stat_checkpointer

Browse Source 
Two attributes related to checkpointer statistics are removed in this
commit:
- buffers_backend, that counts the number of buffers written directly by
a backend.
- buffers_backend_fsync, that counts the number of times a backend had
to do fsync() by its own.

These are actually not checkpointer properties but backend properties.
Also, pg_stat_io provides a more accurate and equivalent report of these
numbers, by tracking all the I/O stats related to backends, including
writes and fsyncs, so storing them in pg_stat_checkpointer was
redundant.

Thanks also to Robert Haas and Amit Kapila for their input.

Bump catalog version.

Author: Bharath Rupireddy
Reviewed-by: Bertrand Drouvot, Andres Freund
Discussion: https://postgr.es/m/20230210004604.mcszbscsqs3bc5nx@awork3.anarazel.de
This commit is contained in:
Michael Paquier
2023-10-27 11:16:39 +09:00
parent 0c882a2988
commit 74604a37f2
9 changed files with 3 additions and 82 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
doc/src/sgml/monitoring.sgml
View File

@ -2953,26 +2953,6 @@ description | Waiting for a newly initialized WAL file to reach durable storage
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>buffers_backend</structfield> <type>bigint</type>
</para>
<para>
Number of buffers written directly by a backend
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>buffers_backend_fsync</structfield> <type>bigint</type>
</para>
<para>
Number of times a backend had to execute its own
<function>fsync</function> call (normally the background writer handles those
even when the backend does its own write)
</para></entry>
</row>
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>buffers_alloc</structfield> <type>bigint</type>