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Message Posted: Thu, 07 Jul 2005 @ 21:08:02 GMT


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Subj:		Fast Path Insert not possible with Begin Transaction????

From:		Mirjam Berger

Hi,

there was a recent thread here about rollbacks in which Dieter wrote:

An insert/select into an empty table works without transient journal (there's only one entry, "table was empty"), *if* the optimizer knows that the transaction is commited:

Teradata session: there was no "begin transaction", so the ins/sel is a single transaction.

ANSI session: ins/sel followed by a commit submitted as a multistatement

A rollback will then be processed similar to a delete without where condition, almost immediatly (similar to a truncate in other DBMSes).

Do I read this right?

Will a statement like the following not use fastpath insert?

     Begin transaction;

     insert into my_empty_table
     select from bla;

     end transaction;

I am surprised! Where can I find more information on this????

Thanks for your help!

Mirjam


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