plsql database event triggers

- 4. Database event triggers need permission ultra-tube 
/ * 
  databases have database-level event triggers and schema level two kinds. 
  The former defines the entire database, the trigger event is the database events, such as database startup, shutdown, logon to the database or exit. 
  The latter is defined in the mode, trigger events include user login mode or quit, or to create and modify database objects (DDL events). 
* / 


- require an administrator to create a table written in the sys 

- create an event history table 
the Create  table event_table ( 
  EVENT_NAME VARCHAR ( 50 ), 
  event_date DATE 
  
); 


- need administrator privileges to set 
the Create  or  the replace  the Trigger TG5 
  the After Logon ON  Database 

the begin 
  INSERT  INTO event_table values(ora_sysevent, sysdate);
 End ; 

the SELECT * from event_table; - view the history of the user login.