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Rewrite the FSM. Instead of relying on a fixed-size shared memory segment, the

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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.
This commit is contained in:
Heikki Linnakangas
2008-09-30 10:52:14 +00:00
parent 2dbc0ca937
commit 15c121b3ed
53 changed files with 1844 additions and 2720 deletions
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48
contrib/pg_freespacemap/pg_freespacemap.sql.in
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@ -1,44 +1,26 @@
/* $PostgreSQL: pgsql/contrib/pg_freespacemap/pg_freespacemap.sql.in,v 1.8 2007/11/13 04:24:28 momjian Exp $ */
/* $PostgreSQL: pgsql/contrib/pg_freespacemap/pg_freespacemap.sql.in,v 1.9 2008/09/30 10:52:09 heikki Exp $ */
-- Adjust this setting to control where the objects get created.
SET search_path = public;
-- Register the functions.
CREATE OR REPLACE FUNCTION pg_freespacemap_pages()
RETURNS SETOF RECORD
AS 'MODULE_PATHNAME', 'pg_freespacemap_pages'
-- Register the C function.
CREATE OR REPLACE FUNCTION pg_freespace(regclass, int4)
RETURNS int2
AS 'MODULE_PATHNAME', 'pg_freespace'
LANGUAGE C;
CREATE OR REPLACE FUNCTION pg_freespacemap_relations()
-- pg_freespace shows the recorded space avail at each block in a relation
CREATE OR REPLACE FUNCTION
pg_freespace(rel regclass, blkno OUT int4, avail OUT int2)
RETURNS SETOF RECORD
AS 'MODULE_PATHNAME', 'pg_freespacemap_relations'
LANGUAGE C;
AS $$
SELECT blkno::int4, pg_freespace($1, blkno::int4) AS avail
FROM generate_series(0, pg_relation_size($1) / current_setting('block_size')::bigint - 1) AS blkno;
$$
LANGUAGE SQL;
-- Create views for convenient access.
CREATE VIEW pg_freespacemap_pages AS
SELECT P.* FROM pg_freespacemap_pages() AS P
(reltablespace oid,
reldatabase oid,
relfilenode oid,
relblocknumber bigint,
bytes integer);
CREATE VIEW pg_freespacemap_relations AS
SELECT P.* FROM pg_freespacemap_relations() AS P
(reltablespace oid,
reldatabase oid,
relfilenode oid,
avgrequest integer,
interestingpages integer,
storedpages integer,
nextpage integer);
-- Don't want these to be available to public.
REVOKE ALL ON FUNCTION pg_freespacemap_pages() FROM PUBLIC;
REVOKE ALL ON pg_freespacemap_pages FROM PUBLIC;
REVOKE ALL ON FUNCTION pg_freespacemap_relations() FROM PUBLIC;
REVOKE ALL ON pg_freespacemap_relations FROM PUBLIC;
REVOKE ALL ON FUNCTION pg_freespace(regclass, int4) FROM PUBLIC;
REVOKE ALL ON FUNCTION pg_freespace(regclass) FROM PUBLIC;