Uniqueness and determinism

• Columns cannot be masked both deterministically and uniquely.
• A pattern based dataset cannot be used to mask a column uniquely.
• The same value may be masked differently across columns if the columns have different lengths, even if the same dataset is used and both columns are masked deterministically.

PostgreSQL

• Inherited tables are not supported.

Other

• Masking may fail on columns that have a check constraint on them.
• Masking can only be done on string, date and exact numeric data types.
• Masking cannot be done within XML or JSON.
• Datasets involving dates cannot be customised.
• If masking fails while partially complete, any changes made to the database cannot be undone. The database should be considered unusable and masking should not be repeated on it.