Edit the resource limits associated with a user profile
  
  Syntax:
   ALTER PROFILE profile_name LIMIT limit(s) range
KEY
   limit  =  SESSIONS_PER_USER
             CPU_PER_SESSION
             CPU_PER_CALL
             CONNECT_TIME
             IDLE_TIME
             LOGICAL_READS_PER_SESSION
             LOGICAL_READS_PER_CALL
             COMPOSITE_LIMIT
             PRIVATE_SGA
   range  =  UNLIMITED | DEFAULT | integer
for PRIVATE_SGA specify K or M
e.g.
ALTER PROFILE MyProfile LIMIT PRIVATE_SGA 50 K
New with Oracle 8 are password related profile limits…
Syntax:
   ALTER PROFILE profile_name LIMIT pw_limit(s) range
KEY
  pw_limit = PASSWORD_LIFE_TIME
             PASSWORD_GRACE_TIME
             PASSWORD_REUSE_TIME
             PASSWORD_REUSE_MAX
             FAILED_LOGIN_ATTEMPTS
             PASSWORD_LOCK_TIME
   range  =  UNLIMITED | DEFAULT | expression
Syntax to customise password verification:
   ALTER PROFILE profile_name LIMIT PASSWORD_VERIFY_FUNCTION {plsql_function | NULL | DEFAULT}
Definitions
   CONNECT_TIME - Max. time user can stay connected 
   IDLE_TIME    - Max. time user can stay connected & idle
   PRIVATE_SGA  - Session space in the shared pool - K or M (bytes)
   COMPOSITE_LIMIT - A weighted sum of CPU_PER_SESSION, CONNECT_TIME, LOGICAL_READS_PER_SESSION, and PRIVATE_SGA. 
   PASSWORD_LIFE_TIME  - Expire password after X no of days
   PASSWORD_GRACE_TIME - Lock account X days after LIFE_TIME expires.
   PASSWORD_REUSE_TIME - Min. no. days before the same pw can be reused
   PASSWORD_REUSE_MAX  - Min. no. of number of pw changes before the current password can be reused
   FAILED_LOGIN_ATTEMPTS - Max no. of incorrect logins before account is locked
   PASSWORD_LOCK_TIME  - Max. no. of days an account will be locked 
DEFAULT refers to values set in the DEFAULT user profile.
  
"Oh judge! Your damn laws! The good people don't need them, and the bad people don't obey them" ~ Ammon Hennacy
  
   Related Oracle Commands:
  
  PROFILE - CREATE PROFILE 
  PROFILE - DROP PROFILE
  ROLE - SET ROLE 
  ROLE - ALTER ROLE
Related Views:
 DBA_PROFILES
 
 DBA_SYS_PRIVS         USER_SYS_PRIVS      ROLE_SYS_PRIVS 
  
 
 V$SESSION
 
 V$SESSION_CONNECT_INFO
 
 V$SESSTAT
 
 V$SESS_IO