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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.
DataBlade® API Programmer's GuideThe Informix® DataBlade® API Programmer's Guide describes information about the DataBlade® API, the C-language application programming interface (API) provided with HCL Informix®.
Database access
XA-compliant external data sources
Overview of integrating XA-compliant data sources in transactionsThe transaction manager, which is an integral part of the database server, not a separate module, can invoke support routines for each XA-compliant, external data source that participates in a distributed transaction at a particular transactional event, such as prepare, commit, or rollback. This interaction conforms to X/Open XA interface standards.
Global transaction IDsThe transaction manager automatically generates and maintains a global transaction ID (of type XID) for each distributed XA transaction in the system. The transaction manager can use the same XID for transactions on different databases.

Global transaction IDs

The transaction manager automatically generates and maintains a global transaction ID (of type XID) for each distributed XA transaction in the system. The transaction manager can use the same XID for transactions on different databases.

You can set the IFX_XA_UNIQUEXID_IN_DATABASE configuration parameter to allow the same XID to represent global transactions on different databases in the same database server instance. If you allow the server to use the same XID on different databases, your databases (instead of the server) are the domain for transactions.

If a transaction has a current transaction ID, the transaction manager uses that transaction ID for the global transaction and fills the XID structure with the transaction ID. The XID structure is defined in the xa.h file in the $INFORMIXDIR/incl/public directory.

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