Greetings: I am working on converting a transportation application from a Progress database to PostgreSQL. This application will be hammered by about 75 users at any given time. Also, depending on the operation, there are many record updates that occur at the trigger level. I would like to be able to provide feedback to the user when they select a row for update (using SELECT FOR UPDATE). At present, if the row is being accessed (with SELECT FOR UPDATE) by another user, the application just sits there waiting. I spent some time looking at pg_locks hoping to be able to gain information from that table so as to programically return something to the user. The stuff I read didn't look promising. The only thing I've been able to come up with is having my own "lock" table and inserting a row into it containing the table name, the pid, the oid of the row, the user id, and a time stamp. Of course, I'm searching lock table entries before selecting for update and reporting a lock situation to the user if I find anything. I'm just wondering if I can use some system table or combination of tables to provide the feed back I need. Does anyone have any ideas about how to accomplish this? I searched the FAQ and didn't find anything.
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