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体验新版 GitCode,发现更多精彩内容 >>
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0498a08e
编写于
9月 15, 2006
作者:
T
Tom Lane
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差异文件
Improve confusing comment for HeapTupleSatisfiesNow, per gripe from Greg Stark.
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src/backend/utils/time/tqual.c
src/backend/utils/time/tqual.c
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src/backend/utils/time/tqual.c
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0498a08e
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@@ -32,7 +32,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/time/tqual.c,v 1.9
6 2006/09/03 15:59:39
tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/time/tqual.c,v 1.9
7 2006/09/15 16:39:32
tgl Exp $
*
*-------------------------------------------------------------------------
*/
...
...
@@ -253,19 +253,18 @@ HeapTupleSatisfiesItself(HeapTupleHeader tuple, Buffer buffer)
*
* The satisfaction of "now" requires the following:
*
* ((Xmin == my-transaction &&
chang
ed 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,
* ((Xmin == my-transaction &&
insert
ed by the current transaction
* Cmin
< my-command && before
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 before
this command,
* || or
*
* (Xmin is committed && the row was modified by a committed transaction, and
* (Xmin is committed && the row was inserted 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
*
(Xmax == my-transaction && the row is being deleted by this transaction
*
Cmax >= my-command) || but it's not deleted "yet", or
*
(Xmax != my-transaction
&& the row was deleted by another transaction
*
Xmax is not committed
)))) 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
...
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