The conditional compilation feature allows selective
inclusion/exclusion of PLSQL code based database version.
The example below shows setting of PLSQL_CCFLAGS flag. This
was introduced in Oracle 10.2 (10gR2) version. The database
features such as "COMMIT WRITE IMMEDIATE NOWAIT" can be used
in the code when executed in 10gR2 and higher or reverted
back to "COMMIT" when executed in earlier versions. This
feature is also useful in PLSQL code
and tracing when code is executed in development environment
and hiding/disabling it when executed in production.