Which two statements are true about the tuning of PL/SQL code? (Choose two.)
A.
Redundant SQL statements in PL/SQL code should be avoided.
B.
Implicit data type conversion in PL/SQL code can improve performance.
C.
Usage of the NOT NULL constraint in PL/SQL code can degrade performance.
D.
If you have one PL/SQL program unit instead of multiple smaller executable sections, performance can be improved.
A,C
http://docs.oracle.com/cd/B14117_01/appdev.101/b10807/12_tune.htm
http://docs.oracle.com/cd/B10501_01/appdev.920/a96624/12_tune.htm
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