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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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27
src/include/storage/indexfsm.h Normal file
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/*-------------------------------------------------------------------------
*
* indexfsm.h
* POSTGRES free space map for quickly finding an unused page in index
*
*
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/indexfsm.h,v 1.1 2008/09/30 10:52:14 heikki Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef INDEXFSM_H_
#define INDEXFSM_H_
#include "utils/rel.h"
extern void InitIndexFreeSpaceMap(Relation rel);
extern BlockNumber GetFreeIndexPage(Relation rel);
extern void RecordFreeIndexPage(Relation rel, BlockNumber page);
extern void RecordUsedIndexPage(Relation rel, BlockNumber page);
extern void IndexFreeSpaceMapTruncate(Relation rel, BlockNumber nblocks);
#endif /* INDEXFSM_H */