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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).
Testing the access methodTo test the access method, take the same actions that users of the access method take to create and access virtual data.
Create and specify storage spacesA storage space is a physical area where the table data is stored. To test how the access method builds new tables, you create a new physical storage space before you create the table. If the access method interfaces with legacy data, the storage spaces exist, usually in external storage.
Testing the access method with an sbspaceAn sbspace holds smart large objects for the database server. This space is physically included in the database server configuration.
Create an sbspaceAn sbspace must exist before you can create a virtual table in it.

Create an sbspace

An sbspace must exist before you can create a virtual table in it.

Before you can test the ability of the access method to create a table that does not yet exist, you must run the onspaces utility to create a smart-large-object storage space. The onspaces command associates a logical name with a physical area of a specified size in a database server partition.

The following onspaces command creates an sbspace named vspace1 for UNIX™:

onspaces -c -S vspace1 -g 2 -p /home/informix/chunk2 
   -o 0 -s 20000

The following onspaces command creates an sbspace named vspace1 for Windows™:

onspaces -c -S vspace1 -g 2 -p \home\informix\chunk2 
   -o 0 -s 20000

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