The list of supported data types varies by release.
Grid Control 10g Release 5 (10.2.0.5), Database 11g Release 2 (11.2), and Cloud Control 12c Release 1 (12.1.0.1) and Release 2 (12.1.0.2)
Numeric Types
The following Numeric Types can use Array List, Delete, Fixed Number, Null Value, Post Processing Function, Preserve Original Data, Random Decimal Numbers, Random Numbers, Shuffle, SQL Expression, Substitute, Table Column, Truncate, Encrypt, and User Defined Function masking formats:
NUMBER
FLOAT
RAW
BINARY_FLOAT
BINARY_DOUBLE
String Types
The following String Types can use Array List, Delete, Fixed Number, Fixed String, Null Value, Post Processing Function, Preserve Original Data, Random Decimal Numbers, Random Digits, Random Numbers, Random Strings, Shuffle, SQL Expression, Substitute, Substring, Table Column, Truncate, Encrypt, and User Defined Function masking formats:
CHAR
NCHAR
VARCHAR2
NVARCHAR2
Date Types
The following Date Types can use Array List, Delete, Null Value, Post Processing Function, Preserve Original Data, Random Dates, Shuffle, SQL Expression, Substitute, Table Column, Truncate, Encrypt, and User Defined Function masking formats:
DATE
TIMESTAMP
Grid Control 11g Release 1 (11.1) and Cloud Control 12c Release 1 (12.1.0.1) and Release 2 (12.1.0.2)
Large Object (LOB) Data Types
The following Data Types can use Fixed Number, Fixed String, Null Value, and SQL Expression masking formats:
BLOB
CLOB
NCLOB