At 16:31 + 3/20/02, Steve Gardner wrote:
Hi All
Could someone explain to me why an index in a select I am doing is only
sometimes used.
The select I do is a complex one with multiple tables, and when it uses the
index it takes 1.5 seconds, but when it dosnt it takes 1 min and 25-50
seconds.
On Wed, 20 Mar 2002, Steve Gardner wrote:
Hi All
Could someone explain to me why an index in a select I am doing is only
sometimes used.
mysql explain select * from mailstat where domain_id in(2);
+--+--+---+--+-+--+-+---
-+
|
If more than a third of the rows would be selected, it is faster not to
use the index.
Over 2 million records match the '2'.
How many are there total?
Steve Gardner wrote:
Hi All
Could someone explain to me why an index in a select I am doing is only
sometimes used.
The select I do is a
