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体验新版 GitCode,发现更多精彩内容 >>
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91ce16a9
编写于
11月 04, 2009
作者:
H
Heikki Linnakangas
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电子邮件补丁
差异文件
Allow rewriting ALTER TABLE to skip WAL logging.
Itagaki Takahiro, with small changes by me and Simon.
上级
a4d03bbc
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
36 addition
and
2 deletion
+36
-2
src/backend/commands/tablecmds.c
src/backend/commands/tablecmds.c
+36
-2
未找到文件。
src/backend/commands/tablecmds.c
浏览文件 @
91ce16a9
...
...
@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.30
4 2009/10/14 22:14:21 tgl
Exp $
* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.30
5 2009/11/04 12:24:23 heikki
Exp $
*
*-------------------------------------------------------------------------
*/
...
...
@@ -3037,6 +3037,9 @@ ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap)
int
i
;
ListCell
*
l
;
EState
*
estate
;
CommandId
mycid
;
BulkInsertState
bistate
;
int
hi_options
;
/*
* Open the relation(s). We have surely already locked the existing
...
...
@@ -3051,6 +3054,29 @@ ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap)
else
newrel
=
NULL
;
/*
* Prepare a BulkInsertState and options for heap_insert. Because
* we're building a new heap, we can skip WAL-logging and fsync it
* to disk at the end instead (unless WAL-logging is required for
* archiving). The FSM is empty too, so don't bother using it.
*/
if
(
newrel
)
{
mycid
=
GetCurrentCommandId
(
true
);
bistate
=
GetBulkInsertState
();
hi_options
=
HEAP_INSERT_SKIP_FSM
;
if
(
!
XLogArchivingActive
())
hi_options
|=
HEAP_INSERT_SKIP_WAL
;
}
else
{
/* keep compiler quiet about using these uninitialized */
mycid
=
0
;
bistate
=
NULL
;
hi_options
=
0
;
}
/*
* If we need to rewrite the table, the operation has to be propagated to
* tables that use this table's rowtype as a column type.
...
...
@@ -3252,7 +3278,7 @@ ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap)
/* Write the tuple out to the new relation */
if
(
newrel
)
simple_heap_insert
(
newrel
,
tupl
e
);
heap_insert
(
newrel
,
tuple
,
mycid
,
hi_options
,
bistat
e
);
ResetExprContext
(
econtext
);
...
...
@@ -3270,7 +3296,15 @@ ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap)
heap_close
(
oldrel
,
NoLock
);
if
(
newrel
)
{
FreeBulkInsertState
(
bistate
);
/* If we skipped writing WAL, then we need to sync the heap. */
if
(
hi_options
&
HEAP_INSERT_SKIP_WAL
)
heap_sync
(
newrel
);
heap_close
(
newrel
,
NoLock
);
}
}
/*
...
...
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