*
*
* 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
*
* 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;
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();
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;
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();
Oid
simple_heap_insert(Relation relation, HeapTuple tup)
{
- return heap_insert(relation, tup, GetCurrentCommandId());
+ return heap_insert(relation, tup, GetCurrentCommandId(), true, true);
}
/*
{
/* Assume there's no chance to put newtup on same page. */
newbuf = RelationGetBufferForTuple(relation, newtup->t_len,
- buffer);
+ buffer, true);
}
else
{
*/
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
newbuf = RelationGetBufferForTuple(relation, newtup->t_len,
- buffer);
+ buffer, true);
}
else
{
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/access/heap/hio.c,v 1.56 2005/05/07 21:32:23 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/access/heap/hio.c,v 1.57 2005/06/20 18:37:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
* happen if space is freed in that page after heap_update finds there's not
* enough there). In that case, the page will be pinned and locked only once.
*
+ * If use_fsm is true (the normal case), we use FSM to help us find free
+ * space. If use_fsm is false, we always append a new empty page to the
+ * end of the relation if the tuple won't fit on the current target page.
+ * This can save some cycles when we know the relation is new and doesn't
+ * contain useful amounts of free space.
+ *
+ * The use_fsm = false case is also useful for non-WAL-logged additions to a
+ * relation, if the caller holds exclusive lock and is careful to invalidate
+ * relation->rd_targblock before the first insertion --- that ensures that
+ * all insertions will occur into newly added pages and not be intermixed
+ * with tuples from other transactions. That way, a crash can't risk losing
+ * any committed data of other transactions. (See heap_insert's comments
+ * for additional constraints needed for safe usage of this behavior.)
+ *
* ereport(ERROR) is allowed here, so this routine *must* be called
* before any (unlogged) changes are made in buffer pool.
*/
Buffer
RelationGetBufferForTuple(Relation relation, Size len,
- Buffer otherBuffer)
+ Buffer otherBuffer, bool use_fsm)
{
Buffer buffer = InvalidBuffer;
Page pageHeader;
* on each page that proves not to be suitable.) If the FSM has no
* record of a page with enough free space, we give up and extend the
* relation.
+ *
+ * When use_fsm is false, we either put the tuple onto the existing
+ * target page or extend the relation.
*/
targetBlock = relation->rd_targblock;
- if (targetBlock == InvalidBlockNumber)
+ if (targetBlock == InvalidBlockNumber && use_fsm)
{
/*
* We have no cached target page, so ask the FSM for an initial
ReleaseBuffer(buffer);
}
+ /* Without FSM, always fall out of the loop and extend */
+ if (!use_fsm)
+ break;
+
/*
* Update FSM as to condition of this page, and ask for another
* page to try.
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.249 2005/05/22 22:30:19 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.250 2005/06/20 18:37:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/heapam.h"
+#include "access/xlog.h"
#include "catalog/heap.h"
#include "catalog/namespace.h"
#include "commands/tablecmds.h"
#include "optimizer/clauses.h"
#include "optimizer/var.h"
#include "parser/parsetree.h"
+#include "storage/smgr.h"
#include "utils/acl.h"
#include "utils/guc.h"
#include "utils/lsyscache.h"
* And open the constructed table for writing.
*/
intoRelationDesc = heap_open(intoRelationId, AccessExclusiveLock);
+
+ /* use_wal off requires rd_targblock be initially invalid */
+ Assert(intoRelationDesc->rd_targblock == InvalidBlockNumber);
+
+ /*
+ * We can skip WAL-logging the insertions, unless PITR is in use.
+ *
+ * Note that for a non-temp INTO table, this is safe only because
+ * we know that the catalog changes above will have been WAL-logged,
+ * and so RecordTransactionCommit will think it needs to WAL-log the
+ * eventual transaction commit. Else the commit might be lost, even
+ * though all the data is safely fsync'd ...
+ */
+ estate->es_into_relation_use_wal = XLogArchivingActive();
}
estate->es_into_relation_descriptor = intoRelationDesc;
* close the "into" relation if necessary, again keeping lock
*/
if (estate->es_into_relation_descriptor != NULL)
+ {
+ /*
+ * If we skipped using WAL, and it's not a temp relation,
+ * we must force the relation down to disk before it's
+ * safe to commit the transaction. This requires forcing
+ * out any dirty buffers and then doing a forced fsync.
+ */
+ if (!estate->es_into_relation_use_wal &&
+ !estate->es_into_relation_descriptor->rd_istemp)
+ {
+ FlushRelationBuffers(estate->es_into_relation_descriptor);
+ smgrimmedsync(estate->es_into_relation_descriptor->rd_smgr);
+ }
+
heap_close(estate->es_into_relation_descriptor, NoLock);
+ }
/*
* close any relations selected FOR UPDATE/FOR SHARE, again keeping locks
tuple = ExecCopySlotTuple(slot);
heap_insert(estate->es_into_relation_descriptor, tuple,
- estate->es_snapshot->curcid);
+ estate->es_snapshot->curcid,
+ estate->es_into_relation_use_wal,
+ false); /* never any point in using FSM */
/* we know there are no indexes to update */
heap_freetuple(tuple);
IncrAppended();
* insert the tuple
*/
newId = heap_insert(resultRelationDesc, tuple,
- estate->es_snapshot->curcid);
+ estate->es_snapshot->curcid,
+ true, true);
IncrAppended();
(estate->es_processed)++;
epqstate->es_result_relation_info = estate->es_result_relation_info;
epqstate->es_junkFilter = estate->es_junkFilter;
epqstate->es_into_relation_descriptor = estate->es_into_relation_descriptor;
+ epqstate->es_into_relation_use_wal = estate->es_into_relation_use_wal;
epqstate->es_param_list_info = estate->es_param_list_info;
if (estate->es_topPlan->nParamExec > 0)
epqstate->es_param_exec_vals = (ParamExecData *)
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/executor/execUtils.c,v 1.123 2005/04/28 21:47:12 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/executor/execUtils.c,v 1.124 2005/06/20 18:37:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
estate->es_result_relation_info = NULL;
estate->es_junkFilter = NULL;
+
estate->es_into_relation_descriptor = NULL;
+ estate->es_into_relation_use_wal = false;
estate->es_param_list_info = NULL;
estate->es_param_exec_vals = NULL;
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/storage/smgr/md.c,v 1.115 2005/05/29 04:23:05 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/storage/smgr/md.c,v 1.116 2005/06/20 18:37:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
/*
* mdimmedsync() -- Immediately sync a relation to stable storage.
+ *
+ * Note that only writes already issued are synced; this routine knows
+ * nothing of dirty buffers that may exist inside the buffer manager.
*/
bool
mdimmedsync(SMgrRelation reln)
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/storage/smgr/smgr.c,v 1.90 2005/06/17 22:32:46 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/storage/smgr/smgr.c,v 1.91 2005/06/20 18:37:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
/*
* smgrimmedsync() -- Force the specified relation to stable storage.
*
- * Synchronously force all of the specified relation down to disk.
+ * Synchronously force all previous writes to the specified relation
+ * down to disk.
*
* This is useful for building completely new relations (eg, new
* indexes). Instead of incrementally WAL-logging the index build
*
* The preceding writes should specify isTemp = true to avoid
* duplicative fsyncs.
+ *
+ * Note that you need to do FlushRelationBuffers() first if there is
+ * any possibility that there are dirty buffers for the relation;
+ * otherwise the sync is not very meaningful.
*/
void
smgrimmedsync(SMgrRelation reln)
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/include/access/heapam.h,v 1.101 2005/06/06 17:01:24 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/access/heapam.h,v 1.102 2005/06/20 18:37:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
ItemPointer tid);
extern void setLastTid(const ItemPointer tid);
-extern Oid heap_insert(Relation relation, HeapTuple tup, CommandId cid);
+extern Oid heap_insert(Relation relation, HeapTuple tup, CommandId cid,
+ bool use_wal, bool use_fsm);
extern HTSU_Result heap_delete(Relation relation, ItemPointer tid, ItemPointer ctid,
CommandId cid, Snapshot crosscheck, bool wait);
extern HTSU_Result heap_update(Relation relation, ItemPointer otid, HeapTuple tup,
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/include/access/hio.h,v 1.27 2004/12/31 22:03:21 pgsql Exp $
+ * $PostgreSQL: pgsql/src/include/access/hio.h,v 1.28 2005/06/20 18:37:01 tgl Exp $
*
*-------------------------------------------------------------------------
*/
extern void RelationPutHeapTuple(Relation relation, Buffer buffer,
HeapTuple tuple);
extern Buffer RelationGetBufferForTuple(Relation relation, Size len,
- Buffer otherBuffer);
+ Buffer otherBuffer, bool use_fsm);
#endif /* HIO_H */
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.134 2005/06/15 07:27:44 neilc Exp $
+ * $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.135 2005/06/20 18:37:02 tgl Exp $
*
*-------------------------------------------------------------------------
*/
ResultRelInfo *es_result_relation_info; /* currently active array
* elt */
JunkFilter *es_junkFilter; /* currently active junk filter */
+
Relation es_into_relation_descriptor; /* for SELECT INTO */
+ bool es_into_relation_use_wal;
/* Parameter info: */
ParamListInfo es_param_list_info; /* values of external params */
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