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体验新版 GitCode,发现更多精彩内容 >>
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f73fc6eb
编写于
7月 30, 1998
作者:
V
Vadim B. Mikheev
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
Fix scan adjustment.
上级
957ff1a0
变更
3
显示空白变更内容
内联
并排
Showing
3 changed file
with
148 addition
and
12 deletion
+148
-12
src/backend/access/nbtree/nbtree.c
src/backend/access/nbtree/nbtree.c
+103
-2
src/backend/access/nbtree/nbtscan.c
src/backend/access/nbtree/nbtscan.c
+28
-1
src/include/access/nbtree.h
src/include/access/nbtree.h
+17
-9
未找到文件。
src/backend/access/nbtree/nbtree.c
浏览文件 @
f73fc6eb
...
...
@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtree.c,v 1.2
7 1998/07/27 19:37:40
vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtree.c,v 1.2
8 1998/07/30 05:04:49
vadim Exp $
*
* NOTES
* This file contains only the public interface routines.
...
...
@@ -44,6 +44,8 @@ bool BuildingBtree = false; /* see comment in btbuild() */
bool
FastBuild
=
true
;
/* use sort/build instead of insertion
* build */
static
void
_bt_restscan
(
IndexScanDesc
scan
);
/*
* btbuild() -- build a new btree index.
*
...
...
@@ -374,8 +376,10 @@ btinsert(Relation rel, Datum *datum, char *nulls, ItemPointer ht_ctid, Relation
pfree
(
btitem
);
pfree
(
itup
);
#if 0
/* adjust any active scans that will be affected by this insertion */
_bt_adjscans(rel, &(res->pointerData), BT_INSERT);
#endif
return
(
res
);
}
...
...
@@ -395,10 +399,28 @@ btgettuple(IndexScanDesc scan, ScanDirection dir)
*/
if
(
ItemPointerIsValid
(
&
(
scan
->
currentItemData
)))
{
/*
* Now we don't adjust scans on insertion (comments in
* nbtscan.c:_bt_scandel()) and I hope that we will unlock
* current index page before leaving index in LLL: this
* means that current index tuple could be moved right
* before we get here and we have to restore our scan
* position. We save heap TID pointed by current index
* tuple and use it. This will work untill we start
* to re-use (move heap tuples) without vacuum...
* - vadim 07/29/98
*/
_bt_restscan
(
scan
);
res
=
_bt_next
(
scan
,
dir
);
}
else
res
=
_bt_first
(
scan
,
dir
);
/* Save heap TID to use it in _bt_restscan */
if
(
res
)
((
BTScanOpaque
)
scan
->
opaque
)
->
curHeapIptr
=
res
->
heap_iptr
;
return
((
char
*
)
res
);
}
...
...
@@ -555,6 +577,7 @@ btmarkpos(IndexScanDesc scan)
BufferGetBlockNumber
(
so
->
btso_curbuf
),
BT_READ
);
scan
->
currentMarkData
=
scan
->
currentItemData
;
so
->
mrkHeapIptr
=
so
->
curHeapIptr
;
}
}
...
...
@@ -585,6 +608,7 @@ btrestrpos(IndexScanDesc scan)
BT_READ
);
scan
->
currentItemData
=
scan
->
currentMarkData
;
so
->
curHeapIptr
=
so
->
mrkHeapIptr
;
}
}
...
...
@@ -598,3 +622,80 @@ btdelete(Relation rel, ItemPointer tid)
/* delete the data from the page */
_bt_pagedel
(
rel
,
tid
);
}
/*
* Reasons are in btgettuple... We have to find index item that
* points to heap tuple returned by previous call to btgettuple().
*/
static
void
_bt_restscan
(
IndexScanDesc
scan
)
{
Relation
rel
=
scan
->
relation
;
BTScanOpaque
so
=
(
BTScanOpaque
)
scan
->
opaque
;
Buffer
buf
=
so
->
btso_curbuf
;
Page
page
=
BufferGetPage
(
buf
);
ItemPointer
current
=
&
(
scan
->
currentItemData
);
OffsetNumber
offnum
=
ItemPointerGetOffsetNumber
(
current
),
maxoff
=
PageGetMaxOffsetNumber
(
page
);
BTPageOpaque
opaque
=
(
BTPageOpaque
)
PageGetSpecialPointer
(
page
);
ItemPointerData
target
=
so
->
curHeapIptr
;
BTItem
item
;
BlockNumber
blkno
;
if
(
maxoff
>=
offnum
)
{
/*
* if the item is where we left it or has just moved right
* on this page, we're done
*/
for
(
;
offnum
<=
maxoff
;
offnum
=
OffsetNumberNext
(
offnum
))
{
item
=
(
BTItem
)
PageGetItem
(
page
,
PageGetItemId
(
page
,
offnum
));
if
(
item
->
bti_itup
.
t_tid
.
ip_blkid
.
bi_hi
==
\
target
.
ip_blkid
.
bi_hi
&&
\
item
->
bti_itup
.
t_tid
.
ip_blkid
.
bi_lo
==
\
target
.
ip_blkid
.
bi_lo
&&
\
item
->
bti_itup
.
t_tid
.
ip_posid
==
target
.
ip_posid
)
{
current
->
ip_posid
=
offnum
;
return
;
}
}
}
/*
* By here, the item we're looking for moved right at least one page
*/
for
(;;)
{
if
(
P_RIGHTMOST
(
opaque
))
elog
(
FATAL
,
"_bt_restscan: my bits moved right off the end of the world!"
);
blkno
=
opaque
->
btpo_next
;
_bt_relbuf
(
rel
,
buf
,
BT_READ
);
buf
=
_bt_getbuf
(
rel
,
blkno
,
BT_READ
);
page
=
BufferGetPage
(
buf
);
maxoff
=
PageGetMaxOffsetNumber
(
page
);
opaque
=
(
BTPageOpaque
)
PageGetSpecialPointer
(
page
);
/* see if it's on this page */
for
(
offnum
=
P_RIGHTMOST
(
opaque
)
?
P_HIKEY
:
P_FIRSTKEY
;
offnum
<=
maxoff
;
offnum
=
OffsetNumberNext
(
offnum
))
{
item
=
(
BTItem
)
PageGetItem
(
page
,
PageGetItemId
(
page
,
offnum
));
if
(
item
->
bti_itup
.
t_tid
.
ip_blkid
.
bi_hi
==
\
target
.
ip_blkid
.
bi_hi
&&
\
item
->
bti_itup
.
t_tid
.
ip_blkid
.
bi_lo
==
\
target
.
ip_blkid
.
bi_lo
&&
\
item
->
bti_itup
.
t_tid
.
ip_posid
==
target
.
ip_posid
)
{
ItemPointerSet
(
current
,
blkno
,
offnum
);
so
->
btso_curbuf
=
buf
;
return
;
}
}
}
}
src/backend/access/nbtree/nbtscan.c
浏览文件 @
f73fc6eb
...
...
@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/Attic/nbtscan.c,v 1.1
4 1998/06/15 19:27:57 momjian
Exp $
* $Header: /cvsroot/pgsql/src/backend/access/nbtree/Attic/nbtscan.c,v 1.1
5 1998/07/30 05:04:50 vadim
Exp $
*
*
* NOTES
...
...
@@ -30,6 +30,7 @@
#include <postgres.h>
#include <storage/bufpage.h>
#include <storage/bufmgr.h>
#include <access/nbtree.h>
typedef
struct
BTScanListData
...
...
@@ -145,9 +146,16 @@ _bt_scandel(IndexScanDesc scan, int op, BlockNumber blkno, OffsetNumber offno)
{
switch
(
op
)
{
/*
* Problems occure when current scan page is splitted!
* We saw "Non-functional updates" (ie index tuples were read twice)
* and partial updates ("good" tuples were not read at all) - due to
* losing scan position here. Look @ nbtree.c:btgettuple()
* what we do now... - vadim 07/29/98
case BT_INSERT:
_bt_step(scan, &buf, ForwardScanDirection);
break;
*/
case
BT_DELETE
:
_bt_step
(
scan
,
&
buf
,
BackwardScanDirection
);
break
;
...
...
@@ -156,6 +164,14 @@ _bt_scandel(IndexScanDesc scan, int op, BlockNumber blkno, OffsetNumber offno)
/* NOTREACHED */
}
so
->
btso_curbuf
=
buf
;
if
(
ItemPointerIsValid
(
current
))
{
Page
page
=
BufferGetPage
(
buf
);
BTItem
btitem
=
(
BTItem
)
PageGetItem
(
page
,
PageGetItemId
(
page
,
ItemPointerGetOffsetNumber
(
current
)));
so
->
curHeapIptr
=
btitem
->
bti_itup
.
t_tid
;
}
}
current
=
&
(
scan
->
currentMarkData
);
...
...
@@ -173,9 +189,12 @@ _bt_scandel(IndexScanDesc scan, int op, BlockNumber blkno, OffsetNumber offno)
buf
=
so
->
btso_curbuf
;
switch
(
op
)
{
/*
* ...comments are above...
case BT_INSERT:
_bt_step(scan, &buf, ForwardScanDirection);
break;
*/
case
BT_DELETE
:
_bt_step
(
scan
,
&
buf
,
BackwardScanDirection
);
break
;
...
...
@@ -188,6 +207,14 @@ _bt_scandel(IndexScanDesc scan, int op, BlockNumber blkno, OffsetNumber offno)
tmp
=
*
current
;
*
current
=
scan
->
currentItemData
;
scan
->
currentItemData
=
tmp
;
if
(
ItemPointerIsValid
(
current
))
{
Page
page
=
BufferGetPage
(
buf
);
BTItem
btitem
=
(
BTItem
)
PageGetItem
(
page
,
PageGetItemId
(
page
,
ItemPointerGetOffsetNumber
(
current
)));
so
->
mrkHeapIptr
=
btitem
->
bti_itup
.
t_tid
;
}
}
}
...
...
src/include/access/nbtree.h
浏览文件 @
f73fc6eb
...
...
@@ -6,7 +6,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: nbtree.h,v 1.2
0 1998/02/26 04:40:22 momjian
Exp $
* $Id: nbtree.h,v 1.2
1 1998/07/30 05:05:05 vadim
Exp $
*
*-------------------------------------------------------------------------
*/
...
...
@@ -62,13 +62,21 @@ typedef BTPageOpaqueData *BTPageOpaque;
* semop() calls, which are expensive.
*
* And it's used to remember actual scankey info (we need in it
* if some scankeys evaled at runtime.
* if some scankeys evaled at runtime).
*
* curHeapIptr & mrkHeapIptr are heap iptr-s from current/marked
* index tuples: we don't adjust scans on insertions (and, if LLL
* is ON, don't hold locks on index pages between passes) - we
* use these pointers to restore index scan positions...
* - vadim 07/29/98
*/
typedef
struct
BTScanOpaqueData
{
Buffer
btso_curbuf
;
Buffer
btso_mrkbuf
;
ItemPointerData
curHeapIptr
;
ItemPointerData
mrkHeapIptr
;
uint16
qual_ok
;
/* 0 for quals like key == 1 && key > 2 */
uint16
numberOfKeys
;
/* number of keys */
uint16
numberOfFirstKeys
;
/* number of keys for 1st
...
...
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