Techniques to create physically and transactionally consistent copies of one or more database objects without impacting the availability of the target database objects are described. In one technique, a consistent copy is created as of the time a copy utility is executed. In another technique, a consistent copy is created as of an arbitrary specified time. This approach modifies a prior copy to bring it "up-to-date." In yet another technique, a consistent copy is created by starting with a current snapshot of the target database objects and selectively removing updates from it back to a user specified arbitrary point-in-time. Each of the described techniques generate consistent copies of the target database objects without blocking users from accessing the target objects during the copy operation.

 
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> Space allocation in a write anywhere file system

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