I think you mean 2PL.

It does really scale, check out the benchmark report on the blog. http://www.infinisql.org/blog/2013/1112/benchmarking-infinis...

For deadlock-prone workloads, it will likely not be as good, admittedly.

I'm considering a variation on MVCC that gets around the single transactionid bottleneck, but the currently implementation is based on 2PL. http://www.infinisql.org/docs/overview/#ftn.idp37098256

For concurrency management algorithms, there are no good ones. Only those that are less bad than others in some cases.