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Avoid WAL-logging individual tuple insertions during CREATE TABLE AS

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(a/k/a SELECT INTO).  Instead, flush and fsync the whole relation before
committing.  We do still need the WAL log when PITR is active, however.
Simon Riggs and Tom Lane.
This commit is contained in:
Tom Lane
2005-06-20 18:37:02 +00:00
parent 1bfdd1a893
commit b95ae32b41
9 changed files with 108 additions and 27 deletions
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36
src/backend/access/heap/heapam.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/heap/heapam.c,v 1.194 2005/06/08 15:50:21 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/heap/heapam.c,v 1.195 2005/06/20 18:37:01 tgl Exp $
*
*
* INTERFACE ROUTINES
@@ -1034,9 +1034,20 @@ heap_get_latest_tid(Relation relation,
*
* The new tuple is stamped with current transaction ID and the specified
* command ID.
*
* If use_wal is false, the new tuple is not logged in WAL, even for a
* non-temp relation. Safe usage of this behavior requires that we arrange
* that all new tuples go into new pages not containing any tuples from other
* transactions, that the relation gets fsync'd before commit, and that the
* transaction emits at least one WAL record to ensure RecordTransactionCommit
* will decide to WAL-log the commit.
*
* use_fsm is passed directly to RelationGetBufferForTuple, which see for
* more info.
*/
Oid
heap_insert(Relation relation, HeapTuple tup, CommandId cid)
heap_insert(Relation relation, HeapTuple tup, CommandId cid,
bool use_wal, bool use_fsm)
{
TransactionId xid = GetCurrentTransactionId();
Buffer buffer;
@@ -1086,7 +1097,8 @@ heap_insert(Relation relation, HeapTuple tup, CommandId cid)
heap_tuple_toast_attrs(relation, tup, NULL);
/* Find buffer to insert this tuple into */
buffer = RelationGetBufferForTuple(relation, tup->t_len, InvalidBuffer);
buffer = RelationGetBufferForTuple(relation, tup->t_len,
InvalidBuffer, use_fsm);
/* NO EREPORT(ERROR) from here till changes are logged */
START_CRIT_SECTION();
@@ -1096,7 +1108,12 @@ heap_insert(Relation relation, HeapTuple tup, CommandId cid)
pgstat_count_heap_insert(&relation->pgstat_info);
/* XLOG stuff */
if (!relation->rd_istemp)
if (relation->rd_istemp)
{
/* No XLOG record, but still need to flag that XID exists on disk */
MyXactMadeTempRelUpdate = true;
}
else if (use_wal)
{
xl_heap_insert xlrec;
xl_heap_header xlhdr;
@@ -1151,11 +1168,6 @@ heap_insert(Relation relation, HeapTuple tup, CommandId cid)
PageSetLSN(page, recptr);
PageSetTLI(page, ThisTimeLineID);
}
else
{
/* No XLOG record, but still need to flag that XID exists on disk */
MyXactMadeTempRelUpdate = true;
}
END_CRIT_SECTION();
@@ -1183,7 +1195,7 @@ heap_insert(Relation relation, HeapTuple tup, CommandId cid)
Oid
simple_heap_insert(Relation relation, HeapTuple tup)
{
return heap_insert(relation, tup, GetCurrentCommandId());
return heap_insert(relation, tup, GetCurrentCommandId(), true, true);
}
/*
@@ -1743,7 +1755,7 @@ l2:
{
/* Assume there's no chance to put newtup on same page. */
newbuf = RelationGetBufferForTuple(relation, newtup->t_len,
buffer);
buffer, true);
}
else
{
@@ -1760,7 +1772,7 @@ l2:
*/
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
newbuf = RelationGetBufferForTuple(relation, newtup->t_len,
buffer);
buffer, true);
}
else
{