Oracle 11g optimizer best join order question

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12-14-2015

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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.

Perlbaby

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dbix::class::storage::dbi::oracle::wherejoins

DBIx::Class::Storage::DBI::Oracle::WhereJoins(3)	User Contributed Perl Documentation	  DBIx::Class::Storage::DBI::Oracle::WhereJoins(3)

NAME

       DBIx::Class::Storage::DBI::Oracle::WhereJoins - Oracle joins in WHERE syntax support (instead of ANSI).

PURPOSE

       This module is used with Oracle < 9.0 due to lack of support for standard ANSI join syntax.

SYNOPSIS

       DBIx::Class should automagically detect Oracle and use this module with no work from you.

DESCRIPTION

       This class implements Oracle's WhereJoin support.  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

       See DBIx::Class::SQLMaker::OracleJoins for implementation details.

BUGS

       Does not support full outer joins.  Probably lots more.

SEE ALSO

       DBIx::Class::SQLMaker
       DBIx::Class::SQLMaker::OracleJoins
       DBIx::Class::Storage::DBI::Oracle::Generic
       DBIx::Class

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 v5.16.2							    2012-08-16			  DBIx::Class::Storage::DBI::Oracle::WhereJoins(3)

Programming