On Tue, Jul 2, 2013 at 5:19 AM, 高健 luckyjack...@gmail.com wrote:
Hello:
I looked into the source code, and I think I now understand it:
cmin and cmax are same! The documentation is too old now.
Yes, you figured it out.
For short: cmin and cmax are overlapped fields and are used within the
same
Hello:
I have question for cmin and cmax.
It is said:
cminis: The command identifier (starting at zero) within the
inserting transaction.
cmax is: The command identifier within the deleting transaction, or
zero.
http://www.postgresql.org/docs/9.1/static/ddl-system-columns.html
Hello:
I looked into the source code, and I think I now understand it:
cmin and cmax are same! The documentation is too old now.
I made another test:
In terminal A:
pgsql=# begin;
BEGIN
pgsql=# select * from tab01;
id | cd
+
(0 rows)
pgsql=# select xmin,xmax,cmin,cmax,* from tab01;
