004 11:16 AM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: RE: Why won't mysql use the index? WAS: strange table speed issue
Here is what the manual says about the table scan threshold:
(http://dev.mysql.com/doc/mysql/en/Where_optimisations.html)
Each table index is q
cc:
06/25/2004 01:52 Fax to:
PM Subject: RE: Why won't mysql use t
The general rule of thumb (in Sybase not sure for MySQL), is if using an
index hits more than 10% of the tables total volume it is
faster/cheaper/less evasive on the drive to just table scan the table
opposed to read an index row, get the representing table row pointer and
seek the table for each q
