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15c121b3ed
free space information is stored in a dedicated FSM relation fork, with each relation (except for hash indexes; they don't use FSM). This eliminates the max_fsm_relations and max_fsm_pages GUC options; remove any trace of them from the backend, initdb, and documentation. Rewrite contrib/pg_freespacemap to match the new FSM implementation. Also introduce a new variant of the get_raw_page(regclass, int4, int4) function in contrib/pageinspect that let's you to return pages from any relation fork, and a new fsm_page_contents() function to inspect the new FSM pages.
27 lines
895 B
MySQL
27 lines
895 B
MySQL
/* $PostgreSQL: pgsql/contrib/pg_freespacemap/pg_freespacemap.sql.in,v 1.9 2008/09/30 10:52:09 heikki Exp $ */
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-- Adjust this setting to control where the objects get created.
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SET search_path = public;
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-- Register the C function.
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CREATE OR REPLACE FUNCTION pg_freespace(regclass, int4)
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RETURNS int2
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AS 'MODULE_PATHNAME', 'pg_freespace'
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LANGUAGE C;
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-- pg_freespace shows the recorded space avail at each block in a relation
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CREATE OR REPLACE FUNCTION
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pg_freespace(rel regclass, blkno OUT int4, avail OUT int2)
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RETURNS SETOF RECORD
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AS $$
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SELECT blkno::int4, pg_freespace($1, blkno::int4) AS avail
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FROM generate_series(0, pg_relation_size($1) / current_setting('block_size')::bigint - 1) AS blkno;
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$$
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LANGUAGE SQL;
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-- Don't want these to be available to public.
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REVOKE ALL ON FUNCTION pg_freespace(regclass, int4) FROM PUBLIC;
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REVOKE ALL ON FUNCTION pg_freespace(regclass) FROM PUBLIC;
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