On Thursday 28 September 2006 14:58, "Jack Orenstein" <[EMAIL PROTECTED]> wrote: > How does versioning work for the index? > > - The update above does not update the index key. Does the index get > updated at all? >
Yes, it does. > - If not, then how can an index lookup return the correct version of > selected rows? > > This aspect of versioning has never been clear to me. Now there's a cost > issue involved, as I need to update every row in a large table, never > updating the index key. Will this run faster if I drop the index? > (Yes, I can run the experiment, but I'd like to understand the > fundamentals better.) Yes, it certainly will. -- "A government that robs Peter to pay Paul can always depend upon the support of Paul." - George Bernard Shaw ---------------------------(end of broadcast)--------------------------- TIP 2: Don't 'kill -9' the postmaster
