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ALTER TABLE with NULL column taking long time

Krisanth KumarApr 1 2014 — edited Apr 1 2014

Hi,

I have a table with around 2million records (approx 10GB table size) when I perform the following alter statement its running fast

ALTER TABLE tbl_1 ADD (col_4 NUMBER DEFAULT 100 NOT NULL);

but when I dont give the NOT NULL in the alter statment its taking very long time to complete that i.e ALTER TABLE tbl_1 ADD (col_4 NUMBER DEFAULT 100); after which I make the column as NOT NULL.

Can some one explain why is it happening like this with respect to the point of performance.

Thanks in advance.
This post has been answered by Martin Preiss on Apr 1 2014
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Locked on Apr 29 2014
Added on Apr 1 2014
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