Svrmgrl was used to perform functions like database creation, startup, shutdown, recovery, oradebug, etc.
In later releases, the INTERNAL user was replaced with "SYS AS SYSDBA".
Example to shutdown the database:
$ svrmgrl Oracle Server Manager Release 18.104.22.168.0 - Production Copyright (c) 1997, 1999, Oracle Corporation. All Rights Reserved. Oracle8i Enterprise Edition Release 22.214.171.124.1 - Production With the Partitioning option JServer Release 126.96.36.199.1 - Production SVRMGR> connect internal Connected. SVRMGR> shutdown immediate Database closed. Database dismounted. ORACLE instance shut down. SVRMGR> exit Server Manager complete.
Take a systemstate dump:
$ svrmgrl Oracle Server Manager Release 188.8.131.52.0 - Production (c) Copyright 1997, Oracle Corporation. All Rights Reserved. Oracle8 Enterprise Edition Release 184.108.40.206.1 - Production With the Partitioning option PL/SQL Release 220.127.116.11.1 - Production SVRMGR> connect internal Connected. SVRMGR> oradebug setmypid Statement processed. SVRMGR> oradebug unlimit Statement processed. SVRMGR> oradebug dump systemstate 1 Statement processed. SVRMGR> exit; Server Manager complete.
Also see, Enterprise Manager for GUI and Web-based management interfaces.