Ok, I've been looking around and this ODB limit answers the first #3 
question. 


>    - *Concurrency level*: in order to guarantee atomicity and 
>    consistency, OrientDB acquire an exclusive lock on the storage during 
>    transaction commit. This means transactions are serialized. Giving this 
>    limitation, *the OrientDB team is already working on improving 
>    parallelism to achieve better scalability on multi-core machines by 
>    optimizing internal structure to avoid exclusive locking.*
>
>
Scott 

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