Hello,
Adding an irrelevant second column to an index instead of
just a single column index gives an incredible speedup and
I don't know why!
(server version: 3.23.53a running P133 32 megs ram - not a speedy
machine)
I have a bunch of records with the relevant columns being:
id
In the last episode (Nov 21), [EMAIL PROTECTED] said:
Adding an irrelevant second column to an index instead of just a
single column index gives an incredible speedup and I don't know why!
If you then remove the index, is it still fast? Maybe you are just
seeing the results of mysql rebuilding
Dan, thanks for your reply.
When I changed the table definition to use the single index and
the multi-index I reloaded the data from scratch each time.
(I did the trials many times from scratch just to be sure and I
do get consistent results)
I also just did an optimize table as you suggest
