Ujang, You did just about everything the wrong way that you possibly could do. You missed having only one control file on the lost disk. Have you contacted Oracle Support yet? No matter what happens, the data in the lost data files is gone. You might be able to comment out the undo_tablespace parameter in the init.ora file to get the database back up, and then bring the data files on line one at a time. But then you will run into recovery problems. You might be hosed. Start looking for your database create scripts. Tom -------------------------------------------------------- This transmission may contain confidential, proprietary, or privileged information which is intended solely for use by the individual or entity to whom it is addressed. If you are not the intended recipient, you are hereby notified that any disclosure, dissemination, copying or distribution of this transmission or its attachments is strictly prohibited. In addition, unauthorized access to this transmission may violate federal or State law, including the Electronic Communications Privacy Act of 1985. If you have received this transmission in error, please notify the sender immediately by return e-mail and delete the transmission and its attachments. ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Ujang Jaenudin Sent: Wednesday, February 28, 2007 8:46 AM To: oracle-l@xxxxxxxxxxxxx Subject: disk crash no mirror, NOARCHILEG mode, and NO BACKUP, some datafiles & undo missing folks, and luckily user was SHUTDOWN ABORT database after make datafiles OFFLINE, so when startup, it always try to find the missing undo file..... this is worst case, please help me on this situation...... regards ujang