Rollback segment usage

From: Jamadagni, Rajendra <Rajendra.Jamadagni_at_espn.com>
Date: Thu, 06 Sep 2001 13:06:07 -0700
Message-ID: <F001.00385E7D.20010906131027@fatcity.com>

One of our user is planning to update a single column in a 5 million row table. Max size of a single RBS is 1GB. When trying to find optimal number of rows to commit after, should we consider the whole row size? Or we can just think about the single column size (this sounds very unlikely to me)?

Also, If I have a table which contains a date column. I need to change this column to a number(14) for business reasons. What would be the best approach?

current plan is as follows ...

1. drop index that use this column,
2. null the column
3. redefine the column
4. populate the column committing n rows at a time
5. rebuild indexes

is there a better and efficient way?

TIA
Raj

Rajendra Jamadagni MIS, ESPN Inc. Rajendra dot Jamadagni at ESPN dot com
Any opinion expressed here is personal and doesn't reflect that of ESPN Inc.

QOTD: Any clod can have facts, but having an opinion is an art !

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Author: Jamadagni, Rajendra
INET: Rajendra.Jamadagni_at_espn.com

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