Re: NOW vs CURRENT_DATE

> I just discover a big not only big huge difference between NOW() and 
> CURRENT_DATE.
> 
> Did you already know about it and do you know why ?
> 
> DELETE FROM blacklist where bl_date < (NOW() - interval '2 DAY');
> on 6 000 000 of records
> 699 ms
> 
> DELETE FROM blacklist where bl_date < (CURRENT_DATE - interval '2 DAY');
> on 6 000 000 of records

Is this a one-off run after each other (e.g. with a ROLLBACK in
between)? If so I suspect the difference is due to caching and if you
re-run the NOW() version it would also be fast.

Also, NOW() is equivalent to CURRENT_TIMESTAMP() rather than
CURRENT_DATE(). Perhaps the date vs. timestamp has some implication of
how they query is planned.

-- 
/ Peter Schuller

PGP userID: 0xE9758B7D or 'Peter Schuller '
Key retrieval: Send an E-Mail to getpgpkey@scode.org
E-Mail: peter.schuller@infidyne.com Web: http://www.scode.org