cannot start database after upgradation
HI
i have upgraded database from 11.1.0 to 11.2.0
after upgrading i cannot start the database, getting the following error:
[oradb@ebsdb ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.1.0.7.0 - Production on Sun Aug 31 17:01:53 2014
Copyright (c) 1982, 2008, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup |
ORACLE instance started.
Total System Global Area 1068937216 bytes
Fixed Size | 2166536 bytes | |
Variable Size | 427819256 bytes |
Database Buffers 624951296 bytes
Redo Buffers | 14000128 bytes |
ORA-00205: error in identifying control file, check alert log for more info
please suggest