LOCKIDTBL is a system parameter that sets the initial number of entries in the system Lock ID table and defines the amount by which the Lock ID table is extended whenever the system runs out of locks. One entry must exist for each lock in the system; each entry requires 4 bytes.
For simple timesharing systems, the default value is adequate. If your application uses many locks, as in the case of heavy RMS file sharing or a database management application, you should increase this parameter. When you change the value of LOCKIDTBL, examine the value of RESHASHTBL and change it if necessary.
The OpenVMS Lock Management facility is described in the VSI OpenVMS Programming Concepts Manual. You can monitor locks with the MONITOR LOCK command of the Monitor utility.