Oracle error- ORA-00844: Parameter not taking MEMORY_TARGET into account

Oracle error

ORA-00844: Parameter not taking MEMORY_TARGET into account

Cause: The parameter was larger than MEMORY_TARGET.

Action: Check the other error messages for additional information about the parameter. Set the parameter to a lower value than MEMORY_TARGET.

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ORA-01154: database busy. Open, close, mount, and dismount not allowed now

Oracle error

ORA-01154: database busy. Open, close, mount, and dismount not allowed now

Cause: Some operation is in progress that expects the opened/mounted state of this instance to remain the same.

Action: Wait for the operation to complete then retry. If attempting to do a shutdown, SHUTDOWN ABORT will work. If this is a shutdown of a standby database that is operating in NO DATA LOSS mode, you must shutdown the primary database first.

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ORA-01153: an incompatible media recovery is active

Oracle error

ORA-01153: an incompatible media recovery is active

Cause: Attempted to start an incompatible media recovery or open resetlogs during media recovery or RMAN backup . Media recovery sessions are incompatible if they attempt to recover the same data file. Incomplete media recovery or open resetlogs is incompatible with any media recovery. Backup or restore by RMAN is incompatible with open resetlogs

Action: Complete or cancel the other media recovery session or RMAN backup

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