| Quellcodebibliothek Statistik Leitseite products/Sources/formale Sprachen/C/Postgres/contrib/postgres_fdw/sql/ (Postgres Database Version 18.4©) Datei vom 11.4.2026 mit Größe 938 B |
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Quelle query_cancel.sqlSprache: SQL |
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SELECT version() ~ 'cygwin' AS skip_test \gset \if :skip_test \quit \endif -- Let's test canceling a remote query. Use a table that does not have -- remote_estimate enabled, else there will be multiple queries to the -- remote and we might unluckily send the cancel in between two of them. -- First let's confirm that the query is actually pushed down. EXPLAIN (VERBOSE, COSTS OFF) SELECT count(*) FROM ft1 a CROSS JOIN ft1 b CROSS JOIN ft1 c CROSS JOIN ft1 d; BEGIN; -- Make sure that connection is open and set up. SELECT count(*) FROM ft1 a; -- On most machines, 10ms will be enough to be sure that we've sent the slow -- query. We may sometimes exercise the race condition where we send cancel -- before the remote side starts the query, but that's fine too. SET LOCAL statement_timeout = '10ms'; -- This would take very long if not canceled: SELECT count(*) FROM ft1 a CROSS JOIN ft1 b CROSS JOIN ft1 c CROSS JOIN ft1 d; COMMIT;
¤ Dauer der Verarbeitung: 0.15 Sekunden (vorverarbeitet am 2026-08-08) ¤*© Formatika GbR, Deutschland |
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2026-08-25