Yup!, i've just created a test case of this behaviour in mysql
console, so it has nothing to do with rails.

Anyway thanks for your help!

On 7 Mar, 00:02, Philip Hallstrom <[email protected]> wrote:
> Based on this, I'd say there is something wrong with your database.  
> Or at the OS level... swapping, bad disks, something.
>
> I'd remove rails from the equation and run a test update query  
> directly via mysql until you can figure it out.
>
> On Mar 6, 2009, at 2:38 PM, Tomim wrote:
>
>
>
> > Tables are almost empty - just a few(<10) records for testing.
> > It seems that those slow queries happen sporadically, one time it
> > takes 3.4sec, the next time 0.0002sec.
> > But the interesting part is that it always takes very short or very
> > long amount of time - never in between.
> > So because the whole database holds just a few records, and there are
> > moments that it works as it should - i think it is a server/caching
> > issue.
> > I just started developing this app, and it only has primary keys on
> > "id" column, no other indexes etc.
>
> > On 6 Mar, 22:40, Philip Hallstrom <[email protected]> wrote:
> >>>>> The problem is that some queries take more than 1sek! - and i've  
> >>>>> got
> >>>>> no idea why.
> >>>>> This doesnt happen on my localhost (sqlite/mysql).
>
> >> Can we see the describe output of those tables? (users, projects,
> >> users_projects)?  Also, how many rows in each?
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