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f57791985a
The new column shows how many backends have a buffer pinned. That can be useful during development or to diagnose production issues e.g. caused by vacuum waiting for cleanup locks. To handle upgrades transparently - the extension might be used in views - deal with callers expecting the old number of columns. Reviewed by Fujii Masao and Rajeev rastogi.
22 lines
780 B
SQL
22 lines
780 B
SQL
/* contrib/pg_buffercache/pg_buffercache--1.1.sql */
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-- complain if script is sourced in psql, rather than via CREATE EXTENSION
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\echo Use "CREATE EXTENSION pg_buffercache" to load this file. \quit
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-- Register the function.
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CREATE FUNCTION pg_buffercache_pages()
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RETURNS SETOF RECORD
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AS 'MODULE_PATHNAME', 'pg_buffercache_pages'
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LANGUAGE C;
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-- Create a view for convenient access.
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CREATE VIEW pg_buffercache AS
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SELECT P.* FROM pg_buffercache_pages() AS P
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(bufferid integer, relfilenode oid, reltablespace oid, reldatabase oid,
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relforknumber int2, relblocknumber int8, isdirty bool, usagecount int2,
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pinning_backends int4);
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-- Don't want these to be available to public.
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REVOKE ALL ON FUNCTION pg_buffercache_pages() FROM PUBLIC;
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REVOKE ALL ON pg_buffercache FROM PUBLIC;
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