Re: Does SQL_NO_CACHE work?

[Chris]

mos wrote:
> I tried :
> 
> select SQL_NO_CACHE * from table where col1='abc';
> 
> which took 800ms the first time it was executed. The second time it was 
> executed it took 0ms. How is that possible if the query is not put into 
> the query cache? Should the query take roughly the same amount of time?

Disk cache.
The database table was still in memory.

The OS caches a lot of stuff too (file descriptors etc).

Try restarting mysql between runs and see if that's more consistent.