database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-10-25 13:17:41 +03:00
Code Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

11
src/include/commands/cluster.h
View File

@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994-5, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/commands/cluster.h,v 1.38 2010/01/06 05:31:14 itagaki Exp $
* $PostgreSQL: pgsql/src/include/commands/cluster.h,v 1.39 2010/02/04 00:09:14 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -23,8 +23,11 @@ extern void cluster_rel(Oid tableOid, Oid indexOid, bool recheck,
extern void check_index_is_clusterable(Relation OldHeap, Oid indexOid,
bool recheck);
extern void mark_index_clustered(Relation rel, Oid indexOid);
extern Oid make_new_heap(Oid OIDOldHeap, const char *NewName,
Oid NewTableSpace);
extern void swap_relation_files(Oid r1, Oid r2, TransactionId frozenXid);
extern Oid make_new_heap(Oid OIDOldHeap, Oid NewTableSpace);
extern void swap_relation_files(Oid r1, Oid r2, bool swap_toast_by_content,
TransactionId frozenXid);
extern void cleanup_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
bool swap_toast_by_content);
#endif /* CLUSTER_H */