DBA_LOCK or DBA_LOCKS view does not exist

Login on to the server OS as oracle user and then

$cd $ORACLE_HOME/rdbms/admin/

$ls -lrt catblock.sql

Here is the output

-rw-r--r-- 1 oracle01 dba01 13900 Nov 13  2007 catblock.sql

Now login as sysdba

$sqlplus "/as sysdba"

Run the script called "catblock.sql". 

SQL>@catblock.sql

The script creates dba_locks and dba_blockers, along with the following views:

• dba_kgllock

• dba_lock (dba_locks is synonym for this)

• dba_lock_internal

• dba_dml_locks

• dba_ddl_locks

• dba_waiters