On 11.01.2011 20:08, Florian Pflug wrote:
> Unfortunately, it seems that doing things this way will undermine the guarantee
> that retrying a failed SSI transaction won't fail due to the same conflict as
> it did originally. Consider
>
> T1> BEGIN TRANSACTION ISOLATION SERIALIZABLE
> T1> SELECT * FROM T
> T1> UPDATE T ...
> T1> PREPARE TRANSACTION
>
> T2> BEGIN TRANSACTION ISOLATION SERIALIZABLE
> T2> SELECT * FROM T
> T2> UPDATE T ...
> -> Serialization Error
>
> Retrying T2 won't help as long as T1 isn't COMMITTED.
T2 should block until T1 commits. I would be very surprised if it
doesn't behave like that already. In general, a prepared transaction
should be treated like an in-progress transaction - it might still abort
too.
-- Heikki Linnakangas EnterpriseDB http://www.enterprisedb.com
