database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-08-21 10:42:50 +03:00
Code Activity

Have CLUSTER advance the table's relfrozenxid. The new frozen point is the

Browse Source 
FreezeXid introduced in a recent commit, so there isn't any data loss in this
approach.

Doing it causes ALTER TABLE (or rather, the forms of it that cause a full table
rewrite) to be affected as well.  In this case, the frozen point is RecentXmin,
because after the rewrite all the tuples are relabeled with the rewriting
transaction's Xid.

TOAST tables are fixed automatically as well, as fallout of the way they were
already being handled in the respective code paths.

With this patch, there is no longer need to VACUUM tables for Xid wraparound
purposes that have been cleaned up via TRUNCATE or CLUSTER.
This commit is contained in:
Alvaro Herrera
2007-05-18 23:19:42 +00:00
parent 2f1bf8248a
commit b40776d221
3 changed files with 32 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
src/include/commands/cluster.h
View File

@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994-5, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/commands/cluster.h,v 1.32 2007/03/13 00:33:43 tgl Exp $
* $PostgreSQL: pgsql/src/include/commands/cluster.h,v 1.33 2007/05/18 23:19:42 alvherre Exp $
*
*-------------------------------------------------------------------------
*/
@@ -24,6 +24,6 @@ extern void check_index_is_clusterable(Relation OldHeap, Oid indexOid,
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);
extern void swap_relation_files(Oid r1, Oid r2, TransactionId frozenXid);
#endif /* CLUSTER_H */