How do I know how long it will take to modify a table?

Hi DBAs,

There are 200 million rows in a table in DB 10.2.0.5 production environment and we have changed the table to add a primary key to this topic. It has been almost 5 hours since its operation and its direct enforcement due to this update.

Any idea or any matter that can give me in how long the update or can I say change table will complete?

Kind regards

Ritu

sweetritz wrote:

@SomeoneElse about 48 hrs

I would like to stop the process and try again. This time, in order to minimize the effect on users:

First create a non-unique index, the online help (assuming that you have Enterprise Edition). You can improve the performance of this astronomical by disabling the automatic management of the PGA TOUR for your session and you give a 2G sort_area_size (I don't think you can go higher than that with 10g).

Then, add the active constraint not validated.

Thirdly, detecting duplicate or NULL values and fix them.

That's it: no interruption of service.

Post edited by: JohnWatson

And I should say: query v$ session_longops and you can have an idea of how long it will take.

Tags: Database

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