ORA-01146 cannot start online backup - file string is already in backup

This is an Oracle Database Server Message. This can be generated by the Oracle Database when running any Oracle program.

Cause

When starting an online backup it was noticed that an online backup was already started for one of the data files.

Action

End the first backup before beginning another.

Contacting Oracle support services ?

Some messages recommend contacting Oracle Support Services to report a problem. When you contact Oracle Support Services, please have the following information available:

The hardware, operating system, and release number of the operating system on which Oracle is running
The complete release number of the Oracle Database (for example, release 9.2.0.1.0 or release 9.0.1.1.2)
All Oracle programs (with version numbers) in use when the error occurred. For example, SQL*Net V2.0 or SQL*Forms V3.0
If you encountered one or more error codes or messages, then the exact code numbers and message text, in the order they appeared
The problem severity, according to the following codes:

Program not usable. Critical impact on operations.
Program usable. Operations severely restricted.
Program usable with limited functions. Not critical to overall operations.
Problem circumvented by customer. Minimal effect, if any, on operations.

You will also be expected to provide the following:

Your name
The name of your organization
Your Oracle Support ID Number
Your telephone number

Linked Error Messages

ORA-01138 database must either be open in this instance or not at all
ORA-01139 RESETLOGS option only valid after an incomplete database recovery
ORA-01140 cannot end online backup - all files are offline or readonly
ORA-01141 error renaming data file string - new file ' string ' not found
ORA-01142 cannot end online backup - none of the files are in backup
ORA-01143 cannot disable media recovery - file string needs media recovery
ORA-01144 File size ( string blocks) exceeds maximum of string blocks
ORA-01145 offline immediate disallowed unless media recovery enabled
ORA-01147 SYSTEM tablespace file string is offline
ORA-01149 cannot shutdown - file string has online backup set
ORA-01150 cannot prevent writes - file string has online backup set
ORA-01151 use media recovery to recover block, restore backup if needed
ORA-01152 file string was not restored from a sufficiently old backup
ORA-01153 an incompatible media recovery is active
ORA-01154 database busy. Open, close, mount, and dismount not allowed now

Oracle Error Messages and Recommended Actions