With default profile in Oracle 11g, accounts are automatically locked 1 day ( PASSWORD_LOCK_TIME ) after 10 failed login attempt ( FAILED_LOGIN_ATTEMPTS ): SQL > SET lines 200 SQL > SET pages 200 SQL > SELECT * FROM dba_profiles WHERE PROFILE = 'DEFAULT' ORDER BY resource_name; PROFILE RESOURCE_NAME RESOURCE LIMIT ------------------------------ -------------------------------- -------- ---------------------------------------- DEFAULT COMPOSITE_LIMIT ...