Postgres by default uses the MVCC (Multiversion Concurrency Control,
MVCC) for concurrency control. This is a large topic and may require
more explanation than a simple email response would easily provide.
The well written PostgreSQL documentation has good explanation on this
topic (http://www.postgresql.org/docs/8.3/interactive/mvcc.html).
If you explicity require table and row level locking the above link
will provide answers on these too.
Allan.
On Fri, Dec 19, 2008 at 10:32 AM, Thomas Kellerer <spam_eater@gmx.net> wrote:
> Hi,
>
> I have a question on how PG manages lock information.
> Does this go through a central "lock manager" that manages the information
> which row is locked by which transactioni. Or is the lock information stored
> directly within the data blocks (so no central "data structure" would be
> needed)
>
> Thanks
> Thomas
>
>
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