User exits
If you find that your application requires arithmetic calculation or data transformation beyond what is provided by GoldenGate functions and SQLEXEC, it is possible to invoke user exits. These are user-defined C or C++ function calls, extending the capabilities of GoldenGate. Typical applications for user exits are housekeeping tasks, data normalization, and conflict detection and handling.
Calling C routines
The user-defined functions may be called from either an Extract or Replicat process via the CUSEREXIT parameter.
To use user exits, create a shared object in C and create a routine to be called from Extract or Replicat.
The routine must accept the following parameters that provide the communication between GoldenGate and your C program:
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Parameter |
Description |
|---|---|
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This indicates when, during processing, the routine is called |
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This provides a response to the routine |
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This supplies information to the routine |
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This implements... |