alter database recover managed standby database disconnect;

The command "ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT" is used to stop the recovery process of a managed standby database and disconnect it from the primary database. This command can be executed on the standby database.

When this command is executed, the managed recovery process is stopped, and the standby database is no longer synchronized with the primary database. It will remain in a consistent state until further action is taken.

It is important to note that after executing this command, the standby database will not be able to receive any more redo data from the primary database. Therefore, it is crucial to ensure that the standby database is fully up-to-date and synchronized with the primary database before executing this command