*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.213.2.1 2002/04/02 05:12:00 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.213.2.2 2002/09/30 19:45:57 tgl Exp $
*
*-------------------------------------------------------------------------
*/
/* non-export function prototypes */
static void vacuum_init(VacuumStmt *vacstmt);
-static void vacuum_shutdown(VacuumStmt *vacstmt);
+static void vacuum_shutdown(VacuumStmt *vacstmt, bool all_rels);
static VRelList getrels(Name VacRelP, const char *stmttype);
static void vac_update_dbstats(Oid dbid,
TransactionId vacuumXID,
TransactionId frozenXID);
static void vac_truncate_clog(TransactionId vacuumXID,
TransactionId frozenXID);
-static void vacuum_rel(Oid relid, VacuumStmt *vacstmt);
+static bool vacuum_rel(Oid relid, VacuumStmt *vacstmt);
static void full_vacuum_rel(Relation onerel, VacuumStmt *vacstmt);
static void scan_heap(VRelStats *vacrelstats, Relation onerel,
VacPageList vacuum_pages, VacPageList fraged_pages);
const char *stmttype = vacstmt->vacuum ? "VACUUM" : "ANALYZE";
NameData VacRel;
Name VacRelName;
+ bool all_rels;
VRelList vrl,
cur;
else
VacRelName = NULL;
+ /* Assume we are processing everything unless one table is mentioned */
+ all_rels = (VacRelName == NULL);
+
/* Build list of relations to process (note this lives in vac_context) */
vrl = getrels(VacRelName, stmttype);
for (cur = vrl; cur != (VRelList) NULL; cur = cur->vrl_next)
{
if (vacstmt->vacuum)
- vacuum_rel(cur->vrl_relid, vacstmt);
+ {
+ if (! vacuum_rel(cur->vrl_relid, vacstmt))
+ all_rels = false; /* forget about updating dbstats */
+ }
if (vacstmt->analyze)
analyze_rel(cur->vrl_relid, vacstmt);
}
/* clean up */
- vacuum_shutdown(vacstmt);
+ vacuum_shutdown(vacstmt, all_rels);
}
/*
}
static void
-vacuum_shutdown(VacuumStmt *vacstmt)
+vacuum_shutdown(VacuumStmt *vacstmt, bool all_rels)
{
/* on entry, we are not in a transaction */
StartTransactionCommand();
/*
- * If we did a database-wide VACUUM, update the database's pg_database
- * row with info about the transaction IDs used, and try to truncate
- * pg_clog.
+ * If we completed a database-wide VACUUM without skipping any
+ * relations, update the database's pg_database row with info
+ * about the transaction IDs used, and try to truncate pg_clog.
*/
- if (vacstmt->vacuum && vacstmt->vacrel == NULL)
+ if (vacstmt->vacuum && all_rels)
{
vac_update_dbstats(MyDatabaseId,
initialOldestXmin, initialFreezeLimit);
/*
* vacuum_rel() -- vacuum one heap relation
*
+ * Returns TRUE if we actually processed the relation (or can ignore it
+ * for some reason), FALSE if we failed to process it due to permissions
+ * or other reasons. (A FALSE result really means that some data
+ * may have been left unvacuumed, so we can't update XID stats.)
+ *
* Doing one heap at a time incurs extra overhead, since we need to
* check that the heap exists again just before we vacuum it. The
* reason that we do this is so that vacuuming can be spread across
*
* At entry and exit, we are not inside a transaction.
*/
-static void
+static bool
vacuum_rel(Oid relid, VacuumStmt *vacstmt)
{
LOCKMODE lmode;
Relation onerel;
LockRelId onerelid;
Oid toast_relid;
+ bool result;
/* Begin a transaction for vacuuming this relation */
StartTransactionCommand();
0, 0, 0))
{
CommitTransactionCommand();
- return;
+ return true; /* okay 'cause no data there */
}
/*
RelationGetRelationName(onerel));
heap_close(onerel, lmode);
CommitTransactionCommand();
- return;
+ return false;
}
/*
else
lazy_vacuum_rel(onerel, vacstmt);
+ result = true; /* did the vacuum */
+
/* all done with this class, but hold lock until commit */
heap_close(onerel, NoLock);
* statistics are totally unimportant for toast relations.
*/
if (toast_relid != InvalidOid)
- vacuum_rel(toast_relid, vacstmt);
+ {
+ if (! vacuum_rel(toast_relid, vacstmt))
+ result = false; /* failed to vacuum the TOAST table? */
+ }
/*
* Now release the session-level lock on the master table.
*/
UnlockRelationForSession(&onerelid, lmode);
+
+ return result;
}
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