Some of the Oracle Question 
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1. Equivalence of varchar2 in pro*C ( struct wala)
2. Variable initialization in pro*C
3. cursors in pro*C
4. memory allocation in C
5. PL/SQL and SQL difference
6. Bulk bind
7. NOCOPY clause
8. Returning clause
9. Error handling in Pro*c
10. how to know lines effected in pro*c
11. Types in oracle
12. constructors
13. Table clause
14. triggers
15. triggers on view possible or not
16. Fine grained acces control
17. security policy
18. version management of application if database is upgraded
19. unix file type
20. why do programs crash in windows and not in unix
21. database tuning
22. application tuning
23. we use rule based optimizer or cost based
24. are shell scripts are differents for different shells
25. what is pl/sql wrapper
26. java in oracle as bulit in