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PL/SQL11g Question #1
1. McDOUG Question #1
A key Oracle11g enhancement for
PL/SQL is the function result cache.
Which of the following types of data
can be used in the parameter list or
return clause (but not necessarily
both) of a function defined using the
RESULT_CACHE keyword?
2. Your Choices?
1. Cursor variables
2. Nested tables and varrays
3. Associative arrays
4. Object types
5. Large objects (BLOB, CLOB, BFILE)
6. Records (user-defined and %ROWTYPE)
7. Scalars (numbers, dates, strings, Booleans)
3. Answer
You cannot use any of the following datatypes in either the
parameter list and RETURN clause of a function that
includes the RESULT_CACHE clause:
Large objects (BLOB, CLOB, BFILE)
Object types
Cursor variables
If you try to use these anywhere in the function header, you
will get this compile error: PLS-00999: implementation
restriction (may be temporary) RESULT_CACHE is
disallowed on subprograms with IN parameter of (or
4. Continue
You can, on the other hand, return the
following types of data (but they may not
appear in the parameter list of the function):
Associative arrays
Nested tables
Varrays
Records (user-defined and %ROWTYPE)
5. Restrictions on Result-Cached Functions
To be result-cached, a function must meet
all of the following criteria:
It is not defined in a module that has
invoker's rights or in an anonymous block.
It is not a pipelined table function.
It has no OUT or IN OUT parameters.
6. Restrictions on Result-Cached Functions
No IN parameter has one of the following types:
– BLOB
– CLOB
– NCLOB
– REF CURSOR
– Collection
– Object
– Record
The return type is none of the following:
– BLOB
– CLOB
– NCLOB
– REF CURSOR
– Object
– Record or PL/SQL collection that contains one of the preceding
unsupported return types