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体验新版 GitCode,发现更多精彩内容 >>
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6952b319
编写于
11月 04, 2000
作者:
B
Bruce Momjian
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doc/FAQ_DEV
浏览文件 @
6952b319
...
...
@@ -26,6 +26,7 @@
10) What is elog()?
11) What is configure all about?
12) How do I add a new port?
13) What is CommandCounterIncrement()?
_________________________________________________________________
1) What tools are available for developers?
...
...
@@ -414,3 +415,15 @@ c-mode)
src/include/storage/s_lock.h for your CPU. There is also a
src/makefiles directory for port-specific Makefile handling. There is
a backend/port directory if you need special files for your OS.
13) What is CommandCounterIncrement()?
Normally, transactions can not see the rows they modify. This allows
UPDATE foo SET x = x + 1 to work correctly.
However, there are cases where a transactions needs to see rows
affected in previous parts of the transaction. This is accomplished
using a Command Counter. Incrementing the counter allows transactions
to be broken into pieces so each piece can see rows modified by
previous pieces. CommandCounterIncrement() increments the Command
Counter, creating a new piece of the transaction.
doc/src/FAQ/FAQ_DEV.html
浏览文件 @
6952b319
...
...
@@ -38,6 +38,7 @@ tables from the backend code?<BR>
<a
href=
"#10"
>
10
</a>
) What is elog()?
<BR>
<a
href=
"#11"
>
11
</a>
) What is configure all about?
<BR>
<a
href=
"#12"
>
12
</a>
) How do I add a new port?
<BR>
<a
href=
"#13"
>
13
</a>
) What is CommandCounterIncrement()?
<BR>
<BR>
<HR>
...
...
@@ -481,6 +482,18 @@ appropriate values. Hopefully, there is already locking code in
There is a
<I>
backend/port
</I>
directory if you need special files for
your OS.
<P>
<H3><a
name=
"13"
>
13
</a>
) What is CommandCounterIncrement()?
</H3><P>
Normally, transactions can not see the rows they modify. This allows
<CODE>
UPDATE foo SET x = x + 1
</CODE>
to work correctly.
<P>
However, there are cases where a transactions needs to see rows affected
in previous parts of the transaction. This is accomplished using a
Command Counter. Incrementing the counter allows transactions to be
broken into pieces so each piece can see rows modified by previous
pieces.
<I>
CommandCounterIncrement()
</I>
increments the Command
Counter, creating a new piece of the transaction.
<P>
</BODY>
</HTML>
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