You have lost all members of your current redo log file group. You issue this query： SQL> select * from v$log； 
GROUP#    SEQ#     BYTES        ARC STATUS            FIRST_NAME 
1                  60           153600        NO INACTIVE            01-03-09：19：34 
2                  61           153600        NO CURRENT            01-03-09：19：50 
You then perform an incomplete recover. You receive this message： ORA-00279： 
change 309141...03/09/01 19：50：14 Needed for thread 1 
ORA-00289： suggestion ： /disk1/archive/arch_61.rdo ORA-00280： change 309043 for thread 1 is in  sequence #61 Specify log： {=suggested | filename | AUTO | CANCEL} How should you respond to this message？（）

There is a problem with one of the disks used for your database and your system administrator informs you that the disk needs to be replaced. The replacement disk will not be available until tomorrow. 
There was only one data file on this disk； it belongs to the USERS tablespace in your PROD database. Your PROD database runs in ARCHIVELOG mode and nightly online backups are taken. The users need to be able to access the data in the USERS tablespace before the replacement disk arrives. You have already taken the USERS tablespace offline and have restored the data file from last night’s backup to a new disk. Which additional steps are required in order to make the USERS tablespace available？（）