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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2006-11-05 22:42:10 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2006-11-05 22:42:10 +0000 |
| commit | 48188e1621bb6711e7d092bee48523b18cd80177 (patch) | |
| tree | 524459ab58f8740a23efa7b7b521833646c678ba /src/include/access/clog.h | |
| parent | 10c70b86023001dc6d9028737afc97850b86e58f (diff) | |
| download | postgresql-48188e1621bb6711e7d092bee48523b18cd80177.tar.gz | |
Fix recently-understood problems with handling of XID freezing, particularly
in PITR scenarios. We now WAL-log the replacement of old XIDs with
FrozenTransactionId, so that such replacement is guaranteed to propagate to
PITR slave databases. Also, rather than relying on hint-bit updates to be
preserved, pg_clog is not truncated until all instances of an XID are known to
have been replaced by FrozenTransactionId. Add new GUC variables and
pg_autovacuum columns to allow management of the freezing policy, so that
users can trade off the size of pg_clog against the amount of freezing work
done. Revise the already-existing code that forces autovacuum of tables
approaching the wraparound point to make it more bulletproof; also, revise the
autovacuum logic so that anti-wraparound vacuuming is done per-table rather
than per-database. initdb forced because of changes in pg_class, pg_database,
and pg_autovacuum catalogs. Heikki Linnakangas, Simon Riggs, and Tom Lane.
Diffstat (limited to 'src/include/access/clog.h')
| -rw-r--r-- | src/include/access/clog.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/include/access/clog.h b/src/include/access/clog.h index 999f15bdf7..0cb76000a2 100644 --- a/src/include/access/clog.h +++ b/src/include/access/clog.h @@ -6,7 +6,7 @@ * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/access/clog.h,v 1.17 2006/03/24 04:32:13 tgl Exp $ + * $PostgreSQL: pgsql/src/include/access/clog.h,v 1.18 2006/11/05 22:42:09 tgl Exp $ */ #ifndef CLOG_H #define CLOG_H @@ -46,6 +46,7 @@ extern void TruncateCLOG(TransactionId oldestXact); /* XLOG stuff */ #define CLOG_ZEROPAGE 0x00 +#define CLOG_TRUNCATE 0x10 extern void clog_redo(XLogRecPtr lsn, XLogRecord *record); extern void clog_desc(StringInfo buf, uint8 xl_info, char *rec); |