Re: read commited
Started by Tom Laneover 22 years ago2 messagesdocs
=?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
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