Migrating from Oracle 8i to Oracle 10g is a big step. I do not have information about your environment, what the scripts do, etc., but I would expect that there will be some impact to your scripts with this migration. To mitigate this risk, I would hope that part of your migration plan is to test this process thoroughly in a non-production environment prior to migrating the database. Only by testing your scripts will you know with certainty what the impact of this migration will be and what needs to be done to ensure that the scripts function properly when the migration occurs in production.
The Oracle 10g Release 2 (10.2) Pro*C/C++ Programmer's Guide has a section titled "What's New in Pro*C/C++?" This might help identify scripts where you may encounter issues after the migration. As well, the Oracle Database 10g Release 2 (10.2) New Features Guide may also be helpful.
Finally, the Oracle Database 10g Release 2 (10.2) Upgrade Guide specifically addresses the different areas of testing that are crucial to a database upgrade.
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