Neil Zanella wrote:
Hello,
Several textbooks talk about query trees and query plans including the following
relatively recent book <http://www.oreilly.com/catalog/sqltuning/> which covers
how to apply performance tuning techniques by using knowledge about the query optimizer to rewrite SQL queries so that they get interpreted more efficiently.
Unfortunately the book only shows how to view the query plan associated witht the given query for Oracle, IBM DB2, and MS SQL Server. I wonder whether PostgreSQL also has a way to let the user see the heuristically computed query plan created by the query optimizer. Is it possible to view query plans with PostgreSQL server and its related command line interfaces? How would I run such a command?
explain query explain analyze query
and you can set logging in postgres.conf, and you can log debug_print_XXX things (xxx like parse, rewritten query, the plan)
C.
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