About Upgrading Precompiler and OCI Applications in Oracle Database
Review this information if you want to upgrade precompiler and Oracle Call Interface (OCI) applications.
Testing precompiler and Oracle Call Interface upgrades consists of the following steps:
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Create a test environment before you upgrade your production environment.
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Include your upgraded application and the new Oracle Database software in your test environment.
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Ensure that your test environment provides a realistic test of your application.