aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--src/backend/access/common/heapvalid.c35
-rw-r--r--src/backend/access/heap/heapam.c9
-rw-r--r--src/backend/storage/buffer/buf_init.c5
-rw-r--r--src/backend/storage/buffer/bufmgr.c16
-rw-r--r--src/backend/utils/time/tqual.c67
-rw-r--r--src/include/access/valid.h6
-rw-r--r--src/include/storage/buf_internals.h3
-rw-r--r--src/include/storage/bufmgr.h3
8 files changed, 110 insertions, 34 deletions
diff --git a/src/backend/access/common/heapvalid.c b/src/backend/access/common/heapvalid.c
index fdf333092fb..f0b4f3f3458 100644
--- a/src/backend/access/common/heapvalid.c
+++ b/src/backend/access/common/heapvalid.c
@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/common/Attic/heapvalid.c,v 1.12 1996/11/10 02:56:47 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/common/Attic/heapvalid.c,v 1.13 1997/03/28 07:03:53 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
@@ -21,6 +21,7 @@
#include <storage/bufpage.h>
#include <utils/rel.h>
#include <utils/tqual.h>
+#include <storage/bufmgr.h>
/* ----------------
* heap_keytest
@@ -89,14 +90,16 @@ heap_keytest(HeapTuple t,
HeapTuple
heap_tuple_satisfies(ItemId itemId,
Relation relation,
+ Buffer buffer,
PageHeader disk_page,
TimeQual qual,
int nKeys,
ScanKey key)
{
- HeapTuple tuple;
+ HeapTuple tuple, result;
bool res;
-
+ TransactionId old_tmin, old_tmax;
+
if (! ItemIdIsUsed(itemId))
return NULL;
@@ -107,12 +110,26 @@ heap_tuple_satisfies(ItemId itemId,
nKeys, key);
else
res = TRUE;
-
- if (res && (relation->rd_rel->relkind == RELKIND_UNCATALOGED
- || HeapTupleSatisfiesTimeQual(tuple,qual)))
- return tuple;
-
- return (HeapTuple) NULL;
+
+ result = (HeapTuple)NULL;
+ if (res) {
+ if(relation->rd_rel->relkind == RELKIND_UNCATALOGED) {
+ result = tuple;
+ } else {
+ old_tmin = tuple->t_tmin;
+ old_tmax = tuple->t_tmax;
+ res = HeapTupleSatisfiesTimeQual(tuple,qual);
+ if(tuple->t_tmin != old_tmin ||
+ tuple->t_tmax != old_tmax) {
+ SetBufferCommitInfoNeedsSave(buffer);
+ }
+ if(res) {
+ result = tuple;
+ }
+ }
+ }
+
+ return result;
}
/*
diff --git a/src/backend/access/heap/heapam.c b/src/backend/access/heap/heapam.c
index d559a3da6d4..67806925b17 100644
--- a/src/backend/access/heap/heapam.c
+++ b/src/backend/access/heap/heapam.c
@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.10 1997/01/23 05:59:47 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.11 1997/03/28 07:04:11 scrappy Exp $
*
*
* INTERFACE ROUTINES
@@ -388,7 +388,7 @@ heapgettup(Relation relation,
* if current tuple qualifies, return it.
* ----------------
*/
- if ((rtup = heap_tuple_satisfies(lpp, relation, (PageHeader) dp,
+ if ((rtup = heap_tuple_satisfies(lpp, relation, *b, (PageHeader) dp,
timeQual, nkeys, key)) != NULL) {
ItemPointer iptr = &(rtup->t_ctid);
if (ItemPointerGetBlockNumber(iptr) != page) {
@@ -1009,7 +1009,7 @@ heap_fetch(Relation relation,
* ----------------
*/
- tuple = heap_tuple_satisfies(lp, relation, dp,
+ tuple = heap_tuple_satisfies(lp, relation, buffer, dp,
timeQual, 0,(ScanKey)NULL);
if (tuple == NULL)
@@ -1154,7 +1154,7 @@ heap_delete(Relation relation, ItemPointer tid)
* check that we're deleteing a valid item
* ----------------
*/
- if (!(tp = heap_tuple_satisfies(lp, relation, dp,
+ if (!(tp = heap_tuple_satisfies(lp, relation, b, dp,
NowTimeQual, 0, (ScanKey) NULL))) {
/* XXX call something else */
@@ -1282,6 +1282,7 @@ heap_replace(Relation relation, ItemPointer otid, HeapTuple tup)
*/
if (!heap_tuple_satisfies(lp,
relation,
+ buffer,
(PageHeader)dp,
NowTimeQual,
0,
diff --git a/src/backend/storage/buffer/buf_init.c b/src/backend/storage/buffer/buf_init.c
index 7613971df7e..dcfebd0d433 100644
--- a/src/backend/storage/buffer/buf_init.c
+++ b/src/backend/storage/buffer/buf_init.c
@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/storage/buffer/buf_init.c,v 1.7 1997/01/26 00:45:25 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/storage/buffer/buf_init.c,v 1.8 1997/03/28 07:04:52 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
@@ -64,6 +64,8 @@ extern IpcSemaphoreId WaitIOSemId;
long *PrivateRefCount; /* also used in freelist.c */
long *LastRefCount; /* refcounts of last ExecMain level */
+long *CommitInfoNeedsSave; /* to write buffers where we have filled in */
+ /* t_tmin (or t_tmax) */
/*
* Data Structures:
@@ -236,6 +238,7 @@ InitBufferPool(IPCKey key)
#endif
PrivateRefCount = (long *) calloc(NBuffers, sizeof(long));
LastRefCount = (long *) calloc(NBuffers, sizeof(long));
+ CommitInfoNeedsSave = (long *) calloc(NBuffers, sizeof(long));
}
/* -----------------------------------------------------
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index b40b0b0e045..5331ab3fbe2 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/storage/buffer/bufmgr.c,v 1.10 1997/01/23 19:43:23 scrappy Exp $
+ * $Header: /cvsroot/pgsql/src/backend/storage/buffer/bufmgr.c,v 1.11 1997/03/28 07:05:03 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
@@ -848,6 +848,10 @@ ReleaseAndReadBuffer(Buffer buffer,
AddBufferToFreelist(bufHdr);
bufHdr->flags |= BM_FREE;
}
+ if(CommitInfoNeedsSave[buffer - 1]) {
+ bufHdr->flags |= (BM_DIRTY | BM_JUST_DIRTIED);
+ CommitInfoNeedsSave[buffer - 1] = 0;
+ }
retbuf = ReadBufferWithBufferLock(relation, blockNum, true);
return retbuf;
}
@@ -1083,6 +1087,7 @@ ResetBufferPool()
{
register int i;
for (i=1; i<=NBuffers; i++) {
+ CommitInfoNeedsSave[i - 1] = 0;
if (BufferIsValid(i)) {
while(PrivateRefCount[i - 1] > 0) {
ReleaseBuffer(i);
@@ -1498,6 +1503,10 @@ ReleaseBuffer(Buffer buffer)
AddBufferToFreelist(bufHdr);
bufHdr->flags |= BM_FREE;
}
+ if(CommitInfoNeedsSave[buffer - 1]) {
+ bufHdr->flags |= (BM_DIRTY | BM_JUST_DIRTIED);
+ CommitInfoNeedsSave[buffer - 1] = 0;
+ }
SpinRelease(BufMgrLock);
}
@@ -1734,3 +1743,8 @@ int SetBufferWriteMode (int mode)
WriteMode = mode;
return (old);
}
+
+void SetBufferCommitInfoNeedsSave(Buffer buffer)
+{
+ CommitInfoNeedsSave[buffer - 1]++;
+}
diff --git a/src/backend/utils/time/tqual.c b/src/backend/utils/time/tqual.c
index dd115b69885..5c2f8271fa8 100644
--- a/src/backend/utils/time/tqual.c
+++ b/src/backend/utils/time/tqual.c
@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/utils/time/tqual.c,v 1.1.1.1 1996/07/09 06:22:10 scrappy Exp $
+ * $Header: /cvsroot/pgsql/src/backend/utils/time/tqual.c,v 1.2 1997/03/28 07:05:28 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
@@ -478,6 +478,8 @@ HeapTupleSatisfiesTimeQual(HeapTuple tuple, TimeQual qual)
/*
* HeapTupleSatisfiesItself --
* True iff heap tuple is valid for "itself."
+ * "{it}self" means valid as of everything that's happened
+ * in the current transaction, _including_ the current command.
*
* Note:
* Assumes heap tuple is valid.
@@ -485,11 +487,15 @@ HeapTupleSatisfiesTimeQual(HeapTuple tuple, TimeQual qual)
/*
* The satisfaction of "itself" requires the following:
*
- * ((Xmin == my-transaction && (Xmax is null [|| Xmax != my-transaction)])
+ * ((Xmin == my-transaction && the row was updated by the current transaction, and
+ * (Xmax is null it was not deleted
+ * [|| Xmax != my-transaction)]) [or it was deleted by another transaction]
* ||
*
- * (Xmin is committed &&
- * (Xmax is null || (Xmax != my-transaction && Xmax is not committed)))
+ * (Xmin is committed && the row was modified by a committed transaction, and
+ * (Xmax is null || the row has not been deleted, or
+ * (Xmax != my-transaction && the row was deleted by another transaction
+ * Xmax is not committed))) that has not been committed
*/
static bool
HeapTupleSatisfiesItself(HeapTuple tuple)
@@ -508,6 +514,8 @@ HeapTupleSatisfiesItself(HeapTuple tuple)
if (!TransactionIdDidCommit((TransactionId)tuple->t_xmin)) {
return (false);
}
+
+ tuple->t_tmin = TransactionIdGetCommitTime(tuple->t_xmin);
}
/* the tuple was inserted validly */
@@ -522,13 +530,23 @@ HeapTupleSatisfiesItself(HeapTuple tuple)
if (TransactionIdIsCurrentTransactionId((TransactionId)tuple->t_xmax)) {
return (false);
}
+
+ if (!TransactionIdDidCommit((TransactionId)tuple->t_xmax)) {
+ return (true);
+ }
- return ((bool)!TransactionIdDidCommit((TransactionId)tuple->t_xmax));
+ /* by here, deleting transaction has committed */
+ tuple->t_tmax = TransactionIdGetCommitTime(tuple->t_xmax);
+
+ return (false);
}
/*
* HeapTupleSatisfiesNow --
* True iff heap tuple is valid "now."
+ * "now" means valid including everything that's happened
+ * in the current transaction _up to, but not including,_
+ * the current command.
*
* Note:
* Assumes heap tuple is valid.
@@ -536,13 +554,19 @@ HeapTupleSatisfiesItself(HeapTuple tuple)
/*
* The satisfaction of "now" requires the following:
*
- * ((Xmin == my-transaction && Cmin != my-command &&
- * (Xmax is null || (Xmax == my-transaction && Cmax != my-command)))
- * ||
+ * ((Xmin == my-transaction && changed by the current transaction
+ * Cmin != my-command && but not by this command, and
+ * (Xmax is null || the row has not been deleted, or
+ * (Xmax == my-transaction && it was deleted by the current transaction
+ * Cmax != my-command))) but not by this command,
+ * || or
*
- * (Xmin is committed &&
- * (Xmax is null || (Xmax == my-transaction && Cmax == my-command) ||
- * (Xmax is not committed && Xmax != my-transaction))))
+ * (Xmin is committed && the row was modified by a committed transaction, and
+ * (Xmax is null || the row has not been deleted, or
+ * (Xmax == my-transaction && the row is being deleted by this command, or
+ * Cmax == my-command) ||
+ * (Xmax is not committed && the row was deleted by another transaction
+ * Xmax != my-transaction)))) that has not been committed
*
* mao says 17 march 1993: the tests in this routine are correct;
* if you think they're not, you're wrong, and you should think
@@ -605,6 +629,13 @@ HeapTupleSatisfiesNow(HeapTuple tuple)
if (!TransactionIdDidCommit((TransactionId)tuple->t_xmin)) {
return (false);
}
+
+ /*
+ * the transaction has been committed--store the commit time _now_
+ * instead of waiting for a vacuum so we avoid the expensive call
+ * next time.
+ */
+ tuple->t_tmin = TransactionIdGetCommitTime(tuple->t_xmin);
}
/* by here, the inserting transaction has committed */
@@ -615,12 +646,18 @@ HeapTupleSatisfiesNow(HeapTuple tuple)
if (TransactionIdIsCurrentTransactionId((TransactionId)tuple->t_xmax)) {
return (false);
}
-
+
+ if (AbsoluteTimeIsBackwardCompatiblyReal(tuple->t_tmax)) {
+ return (false);
+ }
+
if (!TransactionIdDidCommit((TransactionId)tuple->t_xmax)) {
- return (true);
+ return (true);
}
-
- /* by here, deleting transaction has committed */
+
+ /* xmax transaction committed, but no tmax set. so set it. */
+ tuple->t_tmax = TransactionIdGetCommitTime(tuple->t_xmax);
+
return (false);
}
diff --git a/src/include/access/valid.h b/src/include/access/valid.h
index 4ab525dec96..ca209a16e5a 100644
--- a/src/include/access/valid.h
+++ b/src/include/access/valid.h
@@ -6,7 +6,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
- * $Id: valid.h,v 1.3 1996/11/05 10:37:07 scrappy Exp $
+ * $Id: valid.h,v 1.4 1997/03/28 07:05:54 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
@@ -26,7 +26,9 @@ extern bool heap_keytest(HeapTuple t, TupleDesc tupdesc,
int nkeys, ScanKey keys);
extern HeapTuple heap_tuple_satisfies(ItemId itemId, Relation relation,
- PageHeader disk_page, TimeQual qual, int nKeys, ScanKey key);
+ Buffer buffer, PageHeader disk_page,
+ TimeQual qual, int nKeys,
+ ScanKey key);
extern bool TupleUpdatedByCurXactAndCmd(HeapTuple t);
diff --git a/src/include/storage/buf_internals.h b/src/include/storage/buf_internals.h
index 356d2d8e2d0..4fada24503b 100644
--- a/src/include/storage/buf_internals.h
+++ b/src/include/storage/buf_internals.h
@@ -6,7 +6,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
- * $Id: buf_internals.h,v 1.11 1997/01/25 03:09:33 momjian Exp $
+ * $Id: buf_internals.h,v 1.12 1997/03/28 07:06:48 scrappy Exp $
*
* NOTE
* If BUFFERPAGE0 is defined, then 0 will be used as a
@@ -216,6 +216,7 @@ extern BufferDesc *BufferDescriptors;
extern BufferBlock BufferBlocks;
extern long *PrivateRefCount;
extern long *LastRefCount;
+extern long *CommitInfoNeedsSave;
extern SPINLOCK BufMgrLock;
/* localbuf.c */
diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h
index e4e376e000d..fc239caeed6 100644
--- a/src/include/storage/bufmgr.h
+++ b/src/include/storage/bufmgr.h
@@ -6,7 +6,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
- * $Id: bufmgr.h,v 1.9 1997/01/16 07:53:27 vadim Exp $
+ * $Id: bufmgr.h,v 1.10 1997/03/28 07:06:53 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
@@ -114,6 +114,7 @@ extern int ReleaseAndReadBuffer_Debug(char *file,
extern void BufferRefCountReset(int *refcountsave);
extern void BufferRefCountRestore(int *refcountsave);
extern int SetBufferWriteMode (int mode);
+extern void SetBufferCommitInfoNeedsSave(Buffer buffer);
#endif /* !defined(BufMgrIncluded) */
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-02 19:42:52 +0000