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.

What is the cause of ORA-01146 from Oracle 10g ?

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

How to fix ORA-01146 from Oracle 10g ?

End the first backup before beginning another.

How to deepen your knowledge about Oracle?

You can train yourself with many books and get an advantage over your competitors by developing a set of skills highly sought throughout the world. Niels Bohr saw an expert as "a person who has found out by his own painful experience all the mistakes that one can make in a very narrow field". So why not you? Be an expert!
To that aim, the first reference book I would suggest is "Oracle Database 11g The Complete Reference (Oracle Press)Oracle Database 11g The Complete Reference" by Kevin Loney. This internationally recognized Oracle expert was named Consultant of the Year by ORACLE Magazine in 2002. Also be aware that the 12c Oracle version is available here : Oracle Database 12c The Complete Reference (Oracle Press).
In addition to that, let me suggest "OCP Oracle Certified Professional on Oracle 12c Certification Kit" as further reading in order to improve your skills and pass your first level certification.

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Contacting Oracle support services ?

Some messages recommend contacting Oracle Support Services to report a problem. Please go here for more information : Oracle Support.

Linked Oracle error codes

  • 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