Re: Adding column is slow

What i usually do when i havo to manipulate tables with such amount of records is to slice the updates in smaller pieces ... for example you can update 10000 rows and then commit (you can control this with rowid ...) that way you dont need to worry about rollbacks ...

The add column is instantaneous, the problem is the default clause ( wich makes an update ... and commits only at the end ... you'll need a lot of rollbacks )

Hope this helps ...

Eduardo Tavares

"Peter Laursen" <ptl_at_edbgruppen.dk> wrote in message news:3d64c91c$0$43947$edfadb0f_at_dspool01.news.tele.dk...
> Hi,
>
> System(s) 8.0.5 and 8.1.7 SE
>
> Adding a new column to a large table is taking hours. Its part of an
update
> that will be run at many customers. The table will contain approx 100M
rows.
> The table has 5 number fields and a date field. A new 'number(1) default
0'
> is beeing added
> Assuming the update will run as the only user connected what could be done
> to speed up things?
> Will any of the following help: Disabling triggers? Disabling constraints?
> Dropping indexes and rebuilding?
>
> Also how do I calculate the how much rollback space is needed?
>
> TIA
> Peter Laursen
>
>
>
>
Received on Thu Aug 22 2002 - 09:04:55 CDT