mirror/postgresql
2
0
Fork 0
mirror of https://git.postgresql.org/git/postgresql.git synced 2025-02-11 19:20:40 +08:00
Code Issues Packages Projects Releases Wiki Activity

Fix inconsistency in pg_buffercache docs.

Browse Source 
Commit 6e654546fb avoids locking bufmgr partitions to make pg_buffercache
less disruptive on production systems but forgot to update the docs.

Reported-by: Sawada Masahiko
Author: Sawada Masahiko
Reviewed-by: Amit Kapila
Backpatch-through: 10
Discussion: https://postgr.es/m/CA+fd4k6sD8oeP1qJbFAor=rCpYckU9DsywHiYx3x5Hz5Z8Ua_w@mail.gmail.com
This commit is contained in:
Amit Kapila 2020-05-08 08:33:05 +05:30
parent f2ff203596
commit f9463d2a90
1 changed files with 5 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
doc/src/sgml/pgbuffercache.sgml
View File

@ -135,12 +135,11 @@
</para>
<para>
When the <structname>pg_buffercache</structname> view is accessed, internal buffer
manager locks are taken for long enough to copy all the buffer state
data that the view will display.
This ensures that the view produces a consistent set of results, while not
blocking normal buffer activity longer than necessary. Nonetheless there
could be some impact on database performance if this view is read often.
Since buffer manager locks are not taken to copy the buffer state data that
the view will display, accessing <structname>pg_buffercache</structname> view
has less impact on normal buffer activity but it doesn't provide a consistent
set of results across all buffers. However, we ensure that the information of
each buffer is self-consistent.
</para>
</sect2>