maria-developers team mailing list archive

[Sergei Golubchik <serg@xxxxxxxxxxx>]

Hi, Sergey!

On May 09, Sergey Vojtovich wrote:
> > 
> > > > Which may be fine, if MDL subsystem places only one lock in this
> > > > case (iirc, it does). But what is cheaper - collapse identical
> > > > schemas into one mdl request here (with Hash_set) or let mdl
> > > > sort it out later?
> > > MDL doesn't eliminate them, but rather clones compatible requests.
> > > Performance wise it will be slower in certain cases, but since
> > > this is DDL is performance that important?
> > 
> > If it isn't, why are you eliminating Hash_set?
> Because Hash_set was created for DML too. :(

I see.

I believe it's rather unusual to have DDL that involves many tables,
so fine, ok to push.

Regards,
Sergei