Re: How are locks managed in PG?

Alvaro Herrera, 19.12.2008 13:49:
> We use an in-memory lock manager for table- and page-level locks.  For
> shared tuple locks, they are spilled to disk on an ad-hoc storage system
> (pg_multixact) when there is more than one shared locker.  (Exclusive
> locks and single locker shared locks are stored directly on the locked
> tuple.)
> 
>> Oracle on the other hand stores the lock information directly in the data 
>> block that is locked, thus the number of locks does not affect system 
>> performance (in terms of managing them). 
>>
>> I couldn't find any description on which strategy PG applies.
> 
> None of the above.  We're smarter than everyone else.

Thanks. This was the answer I was looking for :)

Thomas