12-14-2015
Oracle 11g optimizer best join order question
Hi team
Optimizer max permutations and search limit are set to 3.5 million and 10 respectively.The parameter instruct optimizer to evaluate up to 3.5 million permutations for max 10 table joins
I have query with 9 tables joined.
How many combinations will optimizer perform to find best join order? within parameter bounds
Please share me the answer . Is it 9! or 10! or 3.5 million or something else.
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LEARN ABOUT DEBIAN
dbix::class::sqlmaker::oraclejoins
DBIx::Class::SQLMaker::OracleJoins(3pm) User Contributed Perl Documentation DBIx::Class::SQLMaker::OracleJoins(3pm)
NAME
DBIx::Class::SQLMaker::OracleJoins - Pre-ANSI Joins-via-Where-Clause Syntax
PURPOSE
This module is used with Oracle < 9.0 due to lack of support for standard ANSI join syntax.
SYNOPSIS
Not intended for use directly; used as the sql_maker_class for schemas and components.
DESCRIPTION
Implements pre-ANSI joins specified in the where clause. Instead of:
SELECT x FROM y JOIN z ON y.id = z.id
It will write:
SELECT x FROM y, z WHERE y.id = z.id
It should properly support left joins, and right joins. Full outer joins are not possible due to the fact that Oracle requires the entire
query be written to union the results of a left and right join, and by the time this module is called to create the where query and table
definition part of the sql query, it's already too late.
METHODS
select
Overrides DBIx::Class::SQLMaker's select() method, which calls _oracle_joins() to modify the column and table list before calling
next::method().
BUGS
Does not support full outer joins (however neither really does DBIC itself)
SEE ALSO
DBIx::Class::Storage::DBI::Oracle::WhereJoins - Storage class using this
DBIx::Class::SQLMaker - Parent module
DBIx::Class - Duh
AUTHOR
Justin Wheeler "<jwheeler@datademons.com>"
CONTRIBUTORS
David Jack Olrik "<djo@cpan.org>"
LICENSE
This module is licensed under the same terms as Perl itself.
perl v5.14.2 2011-11-29 DBIx::Class::SQLMaker::OracleJoins(3pm)