Because it wasn't in system cache yet?
X Gogo wrote:
> Hi,
>
> I've tried the folowing query:
> SELECT DISTINCT column1 FROM table1 LIMIT 10;
> and got the result for 0.23 sec.
> Then I've tried the same query without limit:
> SELECT DISTINCT column1 FROM table1;
> and got the result for 0.01 sec. which is some 23 times
> faster. There are about 10000 rows in table1 and column1
> has an index. I've read in the manual that MySQL uses optimization when you
> combine DISTINCT with LIMIT n that would make it stop as soon as it finds n
> unique rows.
> Why then the first query that uses LIMIT is considerably slower?
>
> George
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