Oracle Restart supports high availability of the databases in the server by constantly running health checks of services and processes and when service is down, Oracle Restart will help to restart the service on its own and that is why it is called Oracle Restart and it is used in standalone server environments. After the Oracle Restart Sofware is installed for a standalone server, another node cannot be added in the future. The Oracle Automatic Storage Management (ORACLE ASM) has its own instance, and the disk groups are managed by the grid user. Oracle Restart runs from Oracle Grid Infrastructure which has its own grid home, and it is separately than Oracle Database homes.
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Oracle Restart is a feature in Oracle Database that allows you to automatically restart the database and related components (such as listeners and ASM instances) after a failure. It provides a single point of control for starting and stopping the database and related components, and makes it easier to manage the availability of the database.
Oracle Restart consists of the Oracle Universal Installer (OUI), the Oracle Configuration Assistant (DBCA), and the Oracle Management Agent (OMA). These components work together to manage the database and related components, and can be configured through the Oracle Enterprise Manager Cloud Control console or the command line.
With Oracle Restart, you can automate the startup and shutdown of the database and related components, as well as perform tasks such as monitoring the health of the database and automating failover to a standby database. It is an important component of the Oracle Database High Availability architecture.