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Write a WAL record whenever we perform an operation without WAL-logging

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that would've been WAL-logged if archiving was enabled. If we encounter
such records in archive recovery anyway, we know that some data is
missing from the log. A WARNING is emitted in that case.

Original patch by Fujii Masao, with changes by me.
This commit is contained in:
Heikki Linnakangas
2010-01-20 19:43:40 +00:00
parent 47ce95a7b9
commit 09b115f706
7 changed files with 100 additions and 7 deletions
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19
src/backend/commands/tablecmds.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.316 2010/01/17 22:56:21 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.317 2010/01/20 19:43:40 heikki Exp $
*
*-------------------------------------------------------------------------
*/
@ -7015,6 +7015,19 @@ ATExecSetTableSpace(Oid tableOid, Oid newTableSpace)
heap_close(pg_class, RowExclusiveLock);
/*
* Write an XLOG UNLOGGED record if WAL-logging was skipped because
* WAL archiving is not enabled.
*/
if (!XLogIsNeeded() && !rel->rd_istemp)
{
char reason[NAMEDATALEN + 40];
snprintf(reason, sizeof(reason), "ALTER TABLE SET TABLESPACE on \"%s\"",
RelationGetRelationName(rel));
XLogReportUnloggedStatement(reason);
}
relation_close(rel, NoLock);
/* Make sure the reltablespace change is visible */
@ -7043,6 +7056,10 @@ copy_relation_data(SMgrRelation src, SMgrRelation dst,
/*
* We need to log the copied data in WAL iff WAL archiving/streaming is
* enabled AND it's not a temp rel.
*
* Note: If you change the conditions here, update the conditions in
* ATExecSetTableSpace() for when an XLOG UNLOGGED record is written
* to match.
*/
use_wal = XLogIsNeeded() && !istemp;