On Fri, Mar 31, 2017 at 3:33 AM, Konstantin Knizhnik <k.knizh...@postgrespro.ru> wrote: > It is possible to execute query concurrently using SPI? > If so, how it can be enforced? > I tried to open cursor with CURSOR_OPT_PARALLEL_OK flag but it doesn't help: > query is executed by single backend while the same query been launched at > top level uses parallel plan: > > fsstate->portal = SPI_cursor_open_with_args(NULL, fsstate->query, > fsstate->numParams, argtypes, values, nulls, true, CURSOR_OPT_PARALLEL_OK); > ... > SPI_cursor_fetch(fsstate->portal, true, 1);
Parallel execution isn't possible if you are using a cursor-type interface, because a parallel query can't be suspended and resumed like a non-parallel query. If you use a function that executes the query to completion in one go, like SPI_execute_plan, then it's cool. See also commit 61c2e1a95f94bb904953a6281ce17a18ac38ee6d. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
