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Create a "relation mapping" infrastructure to support changing the relfilenodes

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of shared or nailed system catalogs.  This has two key benefits:

* The new CLUSTER-based VACUUM FULL can be applied safely to all catalogs.

* We no longer have to use an unsafe reindex-in-place approach for reindexing
  shared catalogs.

CLUSTER on nailed catalogs now works too, although I left it disabled on
shared catalogs because the resulting pg_index.indisclustered update would
only be visible in one database.

Since reindexing shared system catalogs is now fully transactional and
crash-safe, the former special cases in REINDEX behavior have been removed;
shared catalogs are treated the same as non-shared.

This commit does not do anything about the recently-discussed problem of
deadlocks between VACUUM FULL/CLUSTER on a system catalog and other
concurrent queries; will address that in a separate patch.  As a stopgap,
parallel_schedule has been tweaked to run vacuum.sql by itself, to avoid
such failures during the regression tests.
This commit is contained in:
Tom Lane
2010-02-07 20:48:13 +00:00
parent 7fc30c488f
commit b9b8831ad6
54 changed files with 2316 additions and 585 deletions
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5
src/backend/access/transam/rmgr.c
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@ -3,7 +3,7 @@
*
* Resource managers definition
*
* $PostgreSQL: pgsql/src/backend/access/transam/rmgr.c,v 1.28 2009/12/19 01:32:33 sriggs Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/rmgr.c,v 1.29 2010/02/07 20:48:09 tgl Exp $
*/
#include "postgres.h"
@ -22,6 +22,7 @@
#include "commands/tablespace.h"
#include "storage/freespace.h"
#include "storage/standby.h"
#include "utils/relmapper.h"
const RmgrData RmgrTable[RM_MAX_ID + 1] = {
@ -32,7 +33,7 @@ const RmgrData RmgrTable[RM_MAX_ID + 1] = {
{"Database", dbase_redo, dbase_desc, NULL, NULL, NULL},
{"Tablespace", tblspc_redo, tblspc_desc, NULL, NULL, NULL},
{"MultiXact", multixact_redo, multixact_desc, NULL, NULL, NULL},
{"Reserved 7", NULL, NULL, NULL, NULL, NULL},
{"RelMap", relmap_redo, relmap_desc, NULL, NULL, NULL},
{"Standby", standby_redo, standby_desc, NULL, NULL, NULL},
{"Heap2", heap2_redo, heap2_desc, NULL, NULL, NULL},
{"Heap", heap_redo, heap_desc, NULL, NULL, NULL},