Hi, Many thanks for the fast response. I will use temporary table with copy. Other issue I have is the connection between app and db. I guess, the approach with the copy will also hold down the network I/O between app and db. Keeping in mind that I produce 10,000+ statements. Thx Sven Heikki Linnakangas schrieb: > Sven Geisler wrote: >> I have to insert my arguments to a temporary table first, because the >> arguments are only known in the application tier. >> Is a multiple insert to a temporary table and a final 'DELETE FROM x >> WHERE y IN (SELECT z FROM tmp)' faster than multiple deletes? > > If the number of records is high, it most likely is faster. You should > try it with your data to be sure, but in general doing all the deletes > in one batch is faster when the number of records is high because it > allows using efficient merge joins or sequential scans. > > Populating the temporary table with no indexes should be quite > inexpensive if you make sure you don't do it one record at a time. Use > the COPY command or batched inserts instead. > >
