3. Understanding DBMS Server Requirements for User-Defined Data Types : How the DBMS Server Uses the Code
 
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How the DBMS Server Uses the Code
The code that supports a user-defined data type or SQL function runs as part of the DBMS Server and is available to the entire installation. The DBMS Server, Recovery, and Archiver processes access this code after the code has been properly installed.
Important!  A bug in your code--a memory access violation, in particular--can damage the integrity of data or the operating environment of the DBMS Server.