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Extending Informix®Beyond standard relational database objects, HCL Informix® can be extended to handle specialized data types, access methods, routines, and other objects. Informix® includes many built-in extensions that are fully integrated in the database server. Informix® also provides DataBlade® modules, which are packages of extended database objects for a particular purpose and that are installed separately from the database server. Alternatively, you can create your own user-defined objects for Informix®.
Creating extensionsYou can create user-defined data types, routines, access methods, and other database objects to suit your needs. You can use application programming interfaces to write user-defined routines and applications that access data in Informix® databases.
Virtual-Table Interface GuideThe Informix® Virtual-Table Interface Programmer's Guide explains how to create a primary access method with the Virtual-Table Interface (VTI) so that users have a single SQL interface to HCL Informix® tables and to data that does not conform to the storage scheme of HCL Informix®.
Develop an access methodThese topics describe the steps that you take to implement a user-defined access method with the Virtual-Table Interface (VTI).
Register purpose functionsTo register user-defined purpose functions with the database server, issue a CREATE FUNCTION statement for each one.
Supply routine modifiersWhen you register purpose functions, you can specify optional routine modifiers in the CREATE FUNCTION statement by using the WITH keyword. These routine modifiers allow you to specify certain attributes of function behavior.

Supply routine modifiers

When you register purpose functions, you can specify optional routine modifiers in the CREATE FUNCTION statement by using the WITH keyword. These routine modifiers allow you to specify certain attributes of function behavior.

The PARALLELIZABLE routine modifier

The PARALLELIZABLE routine modifier indicates that you have designed the function to execute safely in parallel. Parallel execution can dramatically speed the throughput of data. The following example adds the PARALLELIZABLE modifier to a CREATE FUNCTION statement.

CREATE FUNCTION open_virtual(pointer) 
RETURNING integer
WITH (PARALLELIZABLE)
EXTERNAL NAME
   '$INFORMIXDIR/extend/amBlade/my_virtual.bld(open_virtual)'
LANGUAGE C

Important: By itself, the routine modifier does not make your purpose function parallelizable. The function must also be designed in such a way that it can safely execute in parallel.

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