# SignatureChecker

Use the `SignatureChecker` tool to identify any SQL functions and procedures in a database that do not follow the SQL argument matching rules described in "Argument matching" in the Derby Reference Manual.

If your application uses SQL functions and/or procedures, you should run this tool against your databases.

- Using SignatureChecker
  Before you run the SignatureChecker tool, make sure that your classpath contains the Derby jar files, including derbytools.jar.