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Restructure CLUSTER/newstyle VACUUM FULL/ALTER TABLE support so that swapping

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of old and new toast tables can be done either at the logical level (by
swapping the heaps' reltoastrelid links) or at the physical level (by swapping
the relfilenodes of the toast tables and their indexes).  This is necessary
infrastructure for upcoming changes to support CLUSTER/VAC FULL on shared
system catalogs, where we cannot change reltoastrelid.  The physical swap
saves a few catalog updates too.

We unfortunately have to keep the logical-level swap logic because in some
cases we will be adding or deleting a toast table, so there's no possibility
of a physical swap.  However, that only happens as a consequence of schema
changes in the table, which we do not need to support for system catalogs,
so such cases aren't an obstacle for that.

In passing, refactor the cluster support functions a little bit to eliminate
unnecessarily-duplicated code; and fix the problem that while CLUSTER had
been taught to rename the final toast table at need, ALTER TABLE had not.
This commit is contained in:
Tom Lane
2010-02-04 00:09:14 +00:00
parent fdac8cf998
commit 9727c583fe
6 changed files with 329 additions and 213 deletions
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12
src/include/utils/rel.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/rel.h,v 1.120 2010/01/17 22:56:23 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/rel.h,v 1.121 2010/02/04 00:09:14 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -202,6 +202,16 @@ typedef struct RelationData
uint16 *rd_exclstrats; /* exclusion ops' strategy numbers, if any */
void *rd_amcache; /* available for use by index AM */
/*
* Hack for CLUSTER, rewriting ALTER TABLE, etc: when writing a new
* version of a table, we need to make any toast pointers inserted into it
* have the existing toast table's OID, not the OID of the transient toast
* table. If rd_toastoid isn't InvalidOid, it is the OID to place in
* toast pointers inserted into this rel. (Note it's set on the new
* version of the main heap, not the toast table itself.)
*/
Oid rd_toastoid; /* Real TOAST table's OID, or InvalidOid */
/*
* sizes of the free space and visibility map forks, or InvalidBlockNumber
* if not known yet