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Top Forums Shell Programming and Scripting Korn Shell Coprocess Performance Question Post 92347 by tmarikle on Friday 9th of December 2005 12:37:14 PM
Old 12-09-2005
I can't speak for Mark but I can let you know several reasons why I use a coprocessor:
  1. sqlplus persistence. I keep one session and don't have to keep spinning up sqlplus with costly session connections.
  2. PL/SQL session state persistence. I can take advantage of package session variables.
  3. Multiple database sessions using several coprocessors simultaneously. Many of our databases can't have database links so multiple sessions simplifies access to more than one database. This is accomplished by redirecting stdin and stdout to different file descriptors.
  4. Finally, the method lends itself (sort of forces you) to wrapping it all up into function libraries. This results in more reuse. Any time I want a new coprocessor, I create a new coprocessor instance and reference it through a handle. I simply send new SQL to one instance or the next. This also provides a convenient mechanism for tracing the SQL and result set
There are a few more. Most people I work with use the same technique that you do but are slowly realizing the advantages to using a coprocessor. A coprocessor may be overkill for some applications but my large data loading and data extraction systems work well with this technique.
 

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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 v5.18.2 2013-07-12 DBIx::Class::Storage::DBI::Oracle::WhereJoins(3)
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