Hello, Database is 220.127.116.11.0 in Linux x86_64 sqlplus> startup ORACLE instance started. Total System Global Area 8551575552 bytes Fixed Size 2243608 bytes Variable Size 1459618792 bytes Database Buffers 7079985152 bytes Redo Buffers 9728000 bytes Database mounted. ORA-01115: IO error reading block from file 117 (block # 1) ORA-01110: data file 117: '/db2/oradata/data/db7_perf/MF_AGING_RPT_2008_01.DBF' ORA-27072: File I/O error Linux-x86_64 Error: 5: Input/output error Additional information: 4 Additional information: 1 Additional information: -1 This database is not important, we have no rman backups. now databse is mounted but not open. Is there a way to quickly force database open (ignore this db block corruption, losing some data is acceptable)? Thank you very much.