MAS! wrote:
> does the "lock table" on MySQL (I'm using 5.0.22 or 5.0.45) works even
> for a cached result?
> 
> this is my scenario, (I'm using MyIsam tables)
> 
> thread 1:
> LOCK TABLE foo WRITE;
> 
> thread 2:
> SELECT * FROM foo ;
> (locked)
> 
> thread 1:
> UNLOCK TABLES;
> 
> thread 2:
> result of SELECT * ..
> 
> and that's is, IMHO, correct; btw, if the result of the select is in the
> cache, it seems that I'm unable to 'lock' again the table:
> 
> thread 1:
> LOCK TABLE foo WRITE;
> 
> thread 2:
> SELECT * FROM foo ;
> I have the result of the select; that was not 'locked' :(
> 
> the only way I found to avoid that is use the SQL_NO_CACHE (then SELECT
> SQL_NO_CACHE FROM foo)
> 
> is that correct?! there is a way to avoid to specify "SQL_NO_CACHE" ?
> or there is something wrong ?!

Try setting query_cache_wlock_invalidate to ON.

Werner


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