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>27.3. Viewing Locks</A
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> Another useful tool for monitoring database activity is the
<TT
CLASS="STRUCTNAME"
>pg_locks</TT
> system table. It allows the
database administrator to view information about the outstanding
locks in the lock manager. For example, this capability can be used
to:
<P
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><LI
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> View all the locks currently outstanding, all the locks on
relations in a particular database, all the locks on a
particular relation, or all the locks held by a particular
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> session.
</P
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> Determine the relation in the current database with the most
ungranted locks (which might be a source of contention among
database clients).
</P
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> Determine the effect of lock contention on overall database
performance, as well as the extent to which contention varies
with overall database traffic.
</P
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Details of the <TT
CLASS="STRUCTNAME"
>pg_locks</TT
> view appear in
<A
HREF="view-pg-locks.html"
>Section 45.58</A
>.
For more information on locking and managing concurrency with
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>, refer to <A
HREF="mvcc.html"
>Chapter 13</A
>.
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