On Thu, 2006-02-02 at 11:27 -0500, Marc Morin wrote: > > > 1- long running report is running on view > > > 2- continuous inserters into view into a table via a rule > > > 3- truncate or rule change occurs, taking an exclusive lock. > > > Must wait for #1 to finish. > > > 4- new reports and inserters must now wait for #3. > > > 5- now everyone is waiting for a single query in #1. Results > > > in loss of insert data granularity (important for our application). > Using a separate lock table is what we've decided to do in this > particular case to serialize #1 and #3. Inserters don't take this lock > and as such will not be stalled. Would it not be simpler to have the Inserters change from one table to another either upon command, on a fixed timing cycle or even better based upon one of the inserted values (Logdate?) (or all 3?). (Requires changes in the application layer: 3GL or db functions). The truncates can wait until the data has stopped being used. I'd be disinclined to using the locking system as a scheduling tool. Best Regards, Simon Riggs
