Re: read commited

=?ISO-8859-1?Q?Dennis_Bj=F6rklund?= <db@zigo.dhs.org> writes:
> The first part in the doc about concurrency with Read Commited
> transactions (12.2.1 in devel doc) it says:
> | Read Committed is the default isolation level in PostgreSQL.
> | When a transaction runs on this isolation level, a SELECT query
> | sees only data committed before the query began; it never sees
> | either uncommitted data or changes committed during query
> | execution by concurrent transactions.

> And that describes serializable transactions.

No, it doesn't.  The critical phrase here is "data committed before the
*query* began" ... not "data committed before the *transaction* began".

            regards, tom lane