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Full Discussion: Korn Shell Coprocess Performance Question
Top Forums Shell Programming and Scripting Korn Shell Coprocess Performance Question Post 92353 by Mark Puddephat on Friday 9th of December 2005 01:08:41 PM
Old 12-09-2005
Actually, you did a pretty good job of speaking for me :-). Some of the benefits of using a coprocess apply in my world too. I too support an application (actually two of them) that uses multiple SQL Loader, COBOL and PL/SQL procedures to perform updates. The PL/SQL procedures can be run independently of each other, in theory at least, but by using a persistent session, and monitoring for error messages, I can prevent needless damage to my data by aborting a session at the point of failure.

Unfortunately the application I support is for an insurance product that is in runoff. No new policies have been sold for 4 years, and no new development on the system is being sanctioned. The programmer who wrote much of this had an aversion to including any error trapping in his code (he was fired for incompetence in 2002), so I have to look for unhandled exceptions and abort processing when they happen. Much as I would like to make the code more robust and efficient, I will never be allowed to do so.

The PL/SQL procedures run in unattended mode at night, and nobody gets to see the results until the next day. The use of coprocesses allows the loads to be initiated by shell scripts that have the intelligence to monitor the ouput from SQLPlus, and shut down gracefully in the event of an error.

Mark
 

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LEARN ABOUT DEBIAN

sql::reservedwords

SQL::ReservedWords(3pm) 				User Contributed Perl Documentation				   SQL::ReservedWords(3pm)

NAME

       SQL::ReservedWords - Reserved SQL words by ANSI/ISO

SYNOPSIS

	  if ( SQL::ReservedWords->is_reserved( $word ) ) {
	      print "$word is a reserved SQL word!";
	  }

DESCRIPTION

       Determine if words are reserved by ANSI/ISO SQL standard.

METHODS

       is_reserved( $word )
	   Returns a boolean indicating if $word is reserved by either "SQL:1992", "SQL:1999" or "SQL:2003".

       is_reserved_by_sql1992( $word )
	   Returns a boolean indicating if $word is reserved by "SQL:1992".

       is_reserved_by_sql1999( $word )
	   Returns a boolean indicating if $word is reserved by "SQL:1999".

       is_reserved_by_sql2003( $word )
	   Returns a boolean indicating if $word is reserved by "SQL:2003".

       reserved_by( $word )
	   Returns a list with SQL standards that reserves $word.

       words
	   Returns a list with all reserved words.

EXPORTS

       Nothing by default. Following subroutines can be exported:

       is_reserved
       is_reserved_by_sql1992
       is_reserved_by_sql1999
       is_reserved_by_sql2003
       reserved_by
       words

SEE ALSO

       SQL::ReservedWords::DB2

       SQL::ReservedWords::MySQL

       SQL::ReservedWords::ODBC

       SQL::ReservedWords::Oracle

       SQL::ReservedWords::PostgreSQL

       SQL::ReservedWords::SQLite

       SQL::ReservedWords::SQLServer

       ISO/IEC 9075:1992 Database languages -- SQL

       ISO/IEC 9075-2:1999 Database languages -- SQL -- Part 2: Foundation (SQL/Foundation)

       ISO/IEC 9075-2:2003 Database languages -- SQL -- Part 2: Foundation (SQL/Foundation)

AUTHOR

       Christian Hansen "chansen@cpan.org"

COPYRIGHT

       This program is free software, you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.8.8							    2008-03-28						   SQL::ReservedWords(3pm)
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