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Add pg_buffercache_usage_counts() to contrib/pg_buffercache.

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It was pointed out that pg_buffercache_summary()'s report of
the overall average usage count isn't that useful, and what
would be more helpful in many cases is to report totals for
each possible usage count.  Add a new function to do it like
that.  Since pg_buffercache 1.4 is already new for v16,
we don't need to create a new extension version; we'll just
define this as part of 1.4.

Nathan Bossart

Discussion: https://postgr.es/m/20230130233040.GA2800702@nathanxps13
This commit is contained in:
Tom Lane
2023-04-07 14:25:45 -04:00
parent e056c557ae
commit f3fa31327e
5 changed files with 173 additions and 4 deletions
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4
contrib/pg_buffercache/sql/pg_buffercache.sql
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@ -10,15 +10,19 @@ select buffers_used + buffers_unused > 0,
buffers_pinned <= buffers_used
from pg_buffercache_summary();
SELECT count(*) > 0 FROM pg_buffercache_usage_counts() WHERE buffers >= 0;
-- Check that the functions / views can't be accessed by default. To avoid
-- having to create a dedicated user, use the pg_database_owner pseudo-role.
SET ROLE pg_database_owner;
SELECT * FROM pg_buffercache;
SELECT * FROM pg_buffercache_pages() AS p (wrong int);
SELECT * FROM pg_buffercache_summary();
SELECT * FROM pg_buffercache_usage_counts();
RESET role;
-- Check that pg_monitor is allowed to query view / function
SET ROLE pg_monitor;
SELECT count(*) > 0 FROM pg_buffercache;
SELECT buffers_used + buffers_unused > 0 FROM pg_buffercache_summary();
SELECT count(*) > 0 FROM pg_buffercache_usage_counts();