information about concurrency control

Hello everyone,

I have some questions about concurrency control in mysql. I was wondering what commando do you use to check wich concurrency control you have or use in innodb. And what are the different types and security levels (for what are they protected and for what they dont give protection? And how can I raise to a higher concurrency control level?

Hopely someone can and wanne help me with this?

Greets
Matthias