【多选题】
A Recovery begins from the beginning of the CURRENT redo log group.
B Recovery begins from the start of any ACTIVE redo log group or the start of the CURRENT log group if no other group is ACTIVE
C Recovery begins from the last checkpoint position that was recorded in the control file by the checkpoint process (ckpt)
D Recovery begins from the last checkpoint position that was calculated by the Database Writer before instance failure
E Recovery reads redo until the end of the redo thread, and then opens the database. SMON then rolls back any dead transactions
F Recovery reads redo until the end of the redo thread. SMON rolls back any dead transactions, and then the database is opened
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