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-rw-r--r--src/backend/access/heap/heapam.c46
-rw-r--r--src/include/access/htup.h19
-rw-r--r--src/include/access/xlog.h4
3 files changed, 41 insertions, 28 deletions
diff --git a/src/backend/access/heap/heapam.c b/src/backend/access/heap/heapam.c
index d7df449a637..e5e509f92ca 100644
--- a/src/backend/access/heap/heapam.c
+++ b/src/backend/access/heap/heapam.c
@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.148 2002/09/04 20:31:09 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.149 2002/09/26 22:46:29 tgl Exp $
*
*
* INTERFACE ROUTINES
@@ -1185,10 +1185,14 @@ heap_insert(Relation relation, HeapTuple tup, CommandId cid)
rdata[0].len = SizeOfHeapInsert;
rdata[0].next = &(rdata[1]);
- xlhdr.t_oid = HeapTupleGetOid(tup);
xlhdr.t_natts = tup->t_data->t_natts;
+ xlhdr.t_infomask = tup->t_data->t_infomask;
xlhdr.t_hoff = tup->t_data->t_hoff;
- xlhdr.mask = tup->t_data->t_infomask;
+ /*
+ * note we mark rdata[1] as belonging to buffer; if XLogInsert
+ * decides to write the whole page to the xlog, we don't need to
+ * store xl_heap_header in the xlog.
+ */
rdata[1].buffer = buffer;
rdata[1].data = (char *) &xlhdr;
rdata[1].len = SizeOfHeapHeader;
@@ -1200,7 +1204,11 @@ heap_insert(Relation relation, HeapTuple tup, CommandId cid)
rdata[2].len = tup->t_len - offsetof(HeapTupleHeaderData, t_bits);
rdata[2].next = NULL;
- /* If this is the single and first tuple on page... */
+ /*
+ * If this is the single and first tuple on page, we can reinit the
+ * page instead of restoring the whole thing. Set flag, and hide
+ * buffer references from XLogInsert.
+ */
if (ItemPointerGetOffsetNumber(&(tup->t_self)) == FirstOffsetNumber &&
PageGetMaxOffsetNumber(page) == FirstOffsetNumber)
{
@@ -2041,11 +2049,10 @@ log_heap_update(Relation reln, Buffer oldbuf, ItemPointerData from,
rdata[1].len = 0;
rdata[1].next = &(rdata[2]);
- xlhdr.hdr.t_oid = HeapTupleGetOid(newtup);
xlhdr.hdr.t_natts = newtup->t_data->t_natts;
+ xlhdr.hdr.t_infomask = newtup->t_data->t_infomask;
xlhdr.hdr.t_hoff = newtup->t_data->t_hoff;
- xlhdr.hdr.mask = newtup->t_data->t_infomask;
- if (move) /* remember xmin & xmax */
+ if (move) /* remember xmax & xmin */
{
TransactionId xid[2]; /* xmax, xmin */
@@ -2060,6 +2067,10 @@ log_heap_update(Relation reln, Buffer oldbuf, ItemPointerData from,
2 * sizeof(TransactionId));
hsize += 2 * sizeof(TransactionId);
}
+ /*
+ * As with insert records, we need not store the rdata[2] segment
+ * if we decide to store the whole buffer instead.
+ */
rdata[2].buffer = newbuf;
rdata[2].data = (char *) &xlhdr;
rdata[2].len = hsize;
@@ -2276,18 +2287,16 @@ heap_xlog_insert(bool redo, XLogRecPtr lsn, XLogRecord *record)
htup = &tbuf.hdr;
MemSet((char *) htup, 0, sizeof(HeapTupleHeaderData));
/* PG73FORMAT: get bitmap [+ padding] [+ oid] + data */
- memcpy((char *) &tbuf + offsetof(HeapTupleHeaderData, t_bits),
+ memcpy((char *) htup + offsetof(HeapTupleHeaderData, t_bits),
(char *) xlrec + SizeOfHeapInsert + SizeOfHeapHeader,
newlen);
newlen += offsetof(HeapTupleHeaderData, t_bits);
htup->t_natts = xlhdr.t_natts;
+ htup->t_infomask = xlhdr.t_infomask;
htup->t_hoff = xlhdr.t_hoff;
- htup->t_infomask = HEAP_XMAX_INVALID | xlhdr.mask;
HeapTupleHeaderSetXmin(htup, record->xl_xid);
HeapTupleHeaderSetCmin(htup, FirstCommandId);
htup->t_ctid = xlrec->target.tid;
- if (reln->rd_rel->relhasoids)
- HeapTupleHeaderSetOid(htup, xlhdr.t_oid);
offnum = PageAddItem(page, (Item) htup, newlen, offnum,
LP_USED | OverwritePageMode);
@@ -2454,34 +2463,27 @@ newsame:;
htup = &tbuf.hdr;
MemSet((char *) htup, 0, sizeof(HeapTupleHeaderData));
/* PG73FORMAT: get bitmap [+ padding] [+ oid] + data */
- memcpy((char *) &tbuf + offsetof(HeapTupleHeaderData, t_bits),
+ memcpy((char *) htup + offsetof(HeapTupleHeaderData, t_bits),
(char *) xlrec + hsize,
newlen);
newlen += offsetof(HeapTupleHeaderData, t_bits);
htup->t_natts = xlhdr.t_natts;
+ htup->t_infomask = xlhdr.t_infomask;
htup->t_hoff = xlhdr.t_hoff;
- if (reln->rd_rel->relhasoids)
- HeapTupleHeaderSetOid(htup, xlhdr.t_oid);
if (move)
{
TransactionId xid[2]; /* xmax, xmin */
- hsize = SizeOfHeapUpdate + SizeOfHeapHeader;
memcpy((char *) xid,
- (char *) xlrec + hsize, 2 * sizeof(TransactionId));
- htup->t_infomask = xlhdr.mask;
- htup->t_infomask &= ~(HEAP_XMIN_COMMITTED |
- HEAP_XMIN_INVALID |
- HEAP_MOVED_OFF);
- htup->t_infomask |= HEAP_MOVED_IN;
+ (char *) xlrec + SizeOfHeapUpdate + SizeOfHeapHeader,
+ 2 * sizeof(TransactionId));
HeapTupleHeaderSetXmin(htup, xid[1]);
HeapTupleHeaderSetXmax(htup, xid[0]);
HeapTupleHeaderSetXvac(htup, record->xl_xid);
}
else
{
- htup->t_infomask = HEAP_XMAX_INVALID | xlhdr.mask;
HeapTupleHeaderSetXmin(htup, record->xl_xid);
HeapTupleHeaderSetCmin(htup, FirstCommandId);
}
diff --git a/src/include/access/htup.h b/src/include/access/htup.h
index 6da127e4d4b..f340c8143ac 100644
--- a/src/include/access/htup.h
+++ b/src/include/access/htup.h
@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: htup.h,v 1.60 2002/09/04 20:31:37 momjian Exp $
+ * $Id: htup.h,v 1.61 2002/09/26 22:46:29 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -261,6 +261,8 @@ do { \
/*
+ * WAL record definitions for heapam.c's WAL operations
+ *
* XLOG allows to store some information in high 4 bits of log
* record xl_info field
*/
@@ -300,15 +302,22 @@ typedef struct xl_heap_delete
#define SizeOfHeapDelete (offsetof(xl_heap_delete, target) + SizeOfHeapTid)
+/*
+ * We don't store the whole fixed part (HeapTupleHeaderData) of an inserted
+ * or updated tuple in WAL; we can save a few bytes by reconstructing the
+ * fields that are available elsewhere in the WAL record, or perhaps just
+ * plain needn't be reconstructed. These are the fields we must store.
+ * NOTE: t_hoff could be recomputed, but we may as well store it because
+ * it will come for free due to alignment considerations.
+ */
typedef struct xl_heap_header
{
- Oid t_oid;
int16 t_natts;
+ uint16 t_infomask;
uint8 t_hoff;
- uint8 mask; /* low 8 bits of t_infomask */
} xl_heap_header;
-#define SizeOfHeapHeader (offsetof(xl_heap_header, mask) + sizeof(uint8))
+#define SizeOfHeapHeader (offsetof(xl_heap_header, t_hoff) + sizeof(uint8))
/* This is what we need to know about insert */
typedef struct xl_heap_insert
@@ -340,6 +349,8 @@ typedef struct xl_heap_clean
#define SizeOfHeapClean (offsetof(xl_heap_clean, block) + sizeof(BlockNumber))
+
+
/*
* MaxTupleSize is the maximum allowed size of a tuple, including header and
* MAXALIGN alignment padding. Basically it's BLCKSZ minus the other stuff
diff --git a/src/include/access/xlog.h b/src/include/access/xlog.h
index bf2ce611f7f..c8c49936803 100644
--- a/src/include/access/xlog.h
+++ b/src/include/access/xlog.h
@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: xlog.h,v 1.37 2002/09/04 20:31:37 momjian Exp $
+ * $Id: xlog.h,v 1.38 2002/09/26 22:46:29 tgl Exp $
*/
#ifndef XLOG_H
#define XLOG_H
@@ -110,7 +110,7 @@ typedef struct XLogContRecord
/*
* Each page of XLOG file has a header like this:
*/
-#define XLOG_PAGE_MAGIC 0xD059 /* can be used as WAL version indicator */
+#define XLOG_PAGE_MAGIC 0xD05A /* can be used as WAL version indicator */
typedef struct XLogPageHeaderData
{
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-24 20:34:40 +0000