Craig Ringer <craig@xxxxxxxxxxxxxxxxxxxxx> writes: > On 2/11/2009 5:15 PM, Raimon Fernandez wrote: >> If for example I send a SELECT * from myTable, it has 20000 rows, and >> postgre starts sending the rows, how I can cancel this operation ? > Assuming you're asking "is there any way to cancel a running query using > the postgresql tcp/ip protocol" then, as you've noted, you can cancel > the request until you start getting data. > After that, you can still cancel the query by establishing another > connection to the server and calling pg_cancel_backend( ) at the SQL > level. This does, unfortunately, involve the overhead of setting up and > tearing down a connection and the associated backend. The above distinction is nonsense. Query cancel works the same way whether you have started receiving data or not --- it will open a transient connection in any case. Otherwise there would be race condition problems if the backend is just about to start sending data. regards, tom lane -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
