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Remote Dependencies

release of the server. As long as the signature remote dependency mode is in effect on the California server, a timestamp mismatch does not cause an error when get_ emp_name is called.

Note: DETERMINISTIC, PARALLEL_ENABLE, and purity information do not show in the signature mode. Optimizations based on these settings are not automatically reconsidered if a function on a remote system is redefined with different settings. This may lead to incorrect query results when calls to the remote function occur, even indirectly, in a SQL statement, or if the remote function is used, even indirectly, in a function-based index.

When Does a Signature Change?

Switching Datatype Classes

A signature changes when you switch from one class of datatype to another. Within each datatype class, there can be several types. Changing a parameter datatype from one type to another within a class does not cause the signature to change. Datatypes that are not listed in the following table, such as NCHAR or TIMESTAMP, are not part of any class; changing their type always causes a signature mismatch.

VARCHAR types: VARCHAR2, VARCHAR, STRING, LONG, ROWID

Character types: CHARACTER, CHAR

Raw types: RAW, LONG RAW

Integer types: BINARY_INTEGER, PLS_INTEGER, BOOLEAN, NATURAL, POSITIVE, POSITIVEN, NATURALN

Number types: NUMBER, INTEGER, INT, SMALLINT, DECIMAL, DEC, REAL, FLOAT, NUMERIC, DOUBLE PRECISION, DOUBLE PRECISION, NUMERIC

Date types: DATE, TIMESTAMP, TIMESTAMP WITH TIME ZONE, TIMESTAMP WITH LOCAL TIME ZONE, INTERVAL YEAR TO MONTH, INTERVAL DAY TO SECOND

Modes Changing to or from an explicit specification of the default parameter mode IN does not change the signature of a subprogram. For example, changing between:

PROCEDURE P1 (Param1 NUMBER);

PROCEDURE P1 (Param1 IN NUMBER);

Using Procedures and Packages 7-25

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