MVS data sets
Table 1 is a summary of MVS™ data sets that contain TSO/E information.
| MVS data sets | Description | Reference |
|---|---|---|
| Broadcast data set | Contains notices (messages sent to all users of a system), and mail (messages sent to individual users). You can change the amount of space reserved in the broadcast data set for notices using the IKJBCAST macro statement. | Maintaining the UADS, RACF data base, and broadcast data set |
| SYS1.CMDLIB | Contains service routines, utility programs, and TSO/E command processors. You may want to move TSO/E commands to SYS1.LPALIB, possibly improving the performance of TSO/E. | None |
| SYS1.HELP | Contains help information about TSO/E commands and messages. | |
| SYS1.LNKLIB | Contains RACF® commands, the data set initialization program, report writer, and utilities. | None |
| SYS1.LPALIB | Contains some TSO/E commands, such as MVSSERV. It also contains RACF-related information and installation-written exit routines. | None |
| SYS1.MACLIB | Contains the macro definitions for supervisor and data management macro instructions. It also contains RACF and TSO/E macros, such as IKJBCAST. | None |
| SYS1.PARMLIB | Contains IBM-supplied and installation-created lists of system parameter values. It contains parameters you can use to tailor the logon process, and the way TSO/E works with VTAM®. | None |
| SYS1.PROCLIB | Contains the cataloged procedures used to perform system functions. By default, it contains all TSO/E logon procedures. You may want to use your own procedure library. For more information, see Writing a logon procedure. | None |
| RACF data base | Contains profiles for every entity—users, data sets, and groups—defined to RACF. The profiles describe the attributes and the authorities of each of the entities. If you use RACF to add users, logon information is stored in the user's profile. | Maintaining the UADS, RACF data base, and broadcast data set |
| SYS1.UADS | If you use the TSO/E ACCOUNT command to add and maintain users, SYS1.UADS contains a list of TSO/E users and information about them, such as account numbers, logon procedures, and commands they can use. | Maintaining the UADS, RACF data base, and broadcast data set |