I have a fairly large table (greater than 4mil rows) that I would to preform
a query like:
SELECT col1,col2 FROM table WHERE a=1, c=2 ORDER BY b DESC LIMIT 50;
I have an index on the table INDEX1( a,b,c );
When running the query as is, it takes around 4seconds. If I omit the "DESC"
part the query runs in a fraction of a second.
I would like the query to run faster when I use DESC. I looked at
myisamchk -R to sort by the 'b' index but I want to be sure it will speed up
my query since it may take a while to sort all 4million rows.
Does anyone have guidance on how to accomplish this? is myisamchk -R what I
want?
Thanks.
ryan
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