At 12:05 -0500 9/20/02, Naushit Sakarvadia wrote:
>I have question about mysqld theading.
>
>I understand that mysqld will have one thread per connection, is that
>right??
>
> If thru, Can I assign higher priority to perticular
>thread/connection/client ?
No. You can apply priority modifiers to individual statements,
but you state below that is not what you want.
>
>for example , If we have two clients connected to mysqld using
>Thread A and Thread B. ( they are using same DB same TABLE).
>
>I want to give higher priority to Thread A then Thread B.
>By higher priority I mean if Thread B is doing something(
>select/update/insert or anything),
>and if there is some request on Thread A then it should preempt the Thread B
>and it should get executed first, after Thread A releses resourse Thread B
>should continue
>from where it was left.
>
>I am NOT looking for SELECT over UPDATE priority
>
>Second Question.
>
>When I use "--low-priority-updates", Will it have priority between threads?
Yes. It applies globally.
>for example, if Thread B is doing UPDATE and Thread A want to do SELECT,
>will Thread A
>get priority over Thread B? Will it preempt Thread B?
No. That is, if Thread B is *already* executing an UPDATE, Thread A
can't have the server abort that UPDATE so that it can start executing
its SELECT. Once a query starts, it runs to completion.
>
>Thanks
>Naushit.
>
>Note: I am not subcribed to Mysql list , plase cc your reply to me .
>
