Java Virtual Machine fully supports the family of Java Standard Edition java.lang.Runtime.exec methods. These methods spawn a new operating system (OS) process to run a user-supplied command. On the server, you must use these methods with caution. In Java Virtual Machine, OS command execution permissions are not granted to all database users by default and are issued only by privileged administrators. If you are a DBA, then you must know how to use the Runtime.exec functionality in Oracle Database and follow the recommendations. Also, you must be selective about issuing these permissions to database users.