ORA-01157: cannot identify/lock data file

Yesterday when we were testing auto startup of development environment databases, i found that one of the database is getting following error:

ERROR at line 1:
ORA-01157: cannot identify/lock data file 29 - see DBWR trace file
ORA-01110: data file 29:
'/opt/oracle/product/oracle9i/dbs/C:oracleproduct10.2.0oradatapentahoptho_ts.dbf
'

from above datafile name you have realized that its a kinda jerk :s someone has made a datafile with no sense and then he/she have removed the file by O.S command, but he/she did'nt updated database about it !

So during the test when we were starting this database it came untill mount stage and then got stuck !!! i.e.

Problem:

SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01157: cannot identify/lock data file 29 - see DBWR trace file
ORA-01110: data file 29:
'/opt/oracle/product/oracle9i/dbs/C:oracleproduct10.2.0oradatapentahoptho_ts.dbf
'

so to fix it, i did following:

Solution:


SQL>alter database datafile 29 OFFLINE DROP;
SQL>alter database open;


cheers