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    Maxwell Miranda
    Oracle DBA Consultant.
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SMON process consumes 100 % CPU

As soon as customer starts up the database, a lock is put on
SYS.SMON_SCN_TIME by SMON and it never go away.

Database Performance becomes slow.

SMON_SCN_TIME has huge no.of records.

SQL> select count(*) from sys.smon_scn_time;


1 row selected.

It is found that the object has been locked.

SQL> select object_id from dba_objects where object_name = ‘SMON_SCN_TIME’;


1 row selected.

SQL> select * from v$locked_object where object_id = 575;

———- ———- ———- ———- ———-
—————————— —————————— ————
5 5 1494 575 164
dbadmin 4444350
3 conn / as sysdba

/* Set the event at system level */

SQL> alter system set events ‘12500 trace name context forever, level 10’;

/* Delete the records from SMON_SCN_TIME */

SQL> delete from smon_scn_time;

SQL> commit;

SQL> alter system set events ‘12500 trace name context off’;

Now restart the instance.


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