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Using pg_buffercache_summary() is significantly cheaper than querying pg_buffercache and summarizing in SQL. Author: Melih Mutlu <m.melihmutlu@gmail.com> Reviewed-by: Andres Freund <andres@anarazel.de> Reviewed-by: Aleksander Alekseev <aleksander@timescale.com> Reviewed-by: Zhang Mingli <zmlpostgres@gmail.com> Discussion: https://postgr.es/m/CAGPVpCQAXYo54Q%3D8gqBsS%3Du0uk9qhnnq4%2B710BtUhUisX1XGEg%40mail.gmail.com
18 lines
650 B
SQL
18 lines
650 B
SQL
/* contrib/pg_buffercache/pg_buffercache--1.3--1.4.sql */
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-- complain if script is sourced in psql, rather than via ALTER EXTENSION
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\echo Use "ALTER EXTENSION pg_buffercache UPDATE TO '1.4'" to load this file. \quit
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CREATE FUNCTION pg_buffercache_summary(
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OUT buffers_used int4,
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OUT buffers_unused int4,
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OUT buffers_dirty int4,
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OUT buffers_pinned int4,
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OUT usagecount_avg float8)
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AS 'MODULE_PATHNAME', 'pg_buffercache_summary'
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LANGUAGE C PARALLEL SAFE;
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-- Don't want these to be available to public.
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REVOKE ALL ON FUNCTION pg_buffercache_summary() FROM PUBLIC;
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GRANT EXECUTE ON FUNCTION pg_buffercache_summary() TO pg_monitor;
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