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Compatibility with Earlier Releases of PL/SQL

If you have client-side program units written in PL/SQL 1 or PL/SQL 2, you must convert the code to the new level. The PL/SQL 1 conversion utility is provided to help automate the upgrading process.

Stored program units created with previous releases will run against the PL/SQL 9 engine on the Database Server, but may compile with errors. These errors arise in some situations where there is syntax incompatibility between PL/SQL 9 and PL/SQL 2. A compatibility flag in PL/SQL 9 allows you to choose a PL/SQL 2 compatibility mode, so that the PL/SQL 9 engine does not issue such errors when it compiles PL/SQL 2 code in the server.