On Jan 14, 2008, at 3:54 PM, andy wrote:
In our program we wrote the locking into the program, and created a
modulelock table like:
create table moduelock(
userid int,
module int,
primary key (userid, module)
)
The program then locks things before it uses them... but we also
have pretty low contention for modules.
A lock is:
begin
insert into modulelock...
commit;
if commit ok, then go ahead. When we are done, delete from
modulelock where ...
From what I can tell, this kind of roll-your-own application level
locking system is exactly what advisory locks are for. Search the
archives for the last couple of weeks as I remember someone posting
some really helpful functions to assist in using advisory locks.
Erik Jones
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