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 _______________________________________________ Mailing list: https://launchpad.net/~maria-developers Post to : [email protected] Unsubscribe : https://launchpad.net/~maria-developers More help : https://help.launchpad.net/ListHelp
