What methods are available to recover lost control files? (Choose all that apply.)
A. Backup control file.
B. Emergency control file.
C. The create controlfile command.
D. The restore controlfile SQL*Plus command.
E. No backup is required. The database will re-create the control file when it is discovered to be lost.
You can create a backup control file with the alter databse backup controlfile command.You can create a trace file that contains the create controlfile command.
原文：http://www.cnblogs.com/Babylon/p/7809866.html