Database advanced learning notes - system package

1.dbms_output package
effect ： Mainly used for debugging pl/sql Program , Or in sql*plus The information in the command (displaying message) And reports

-- Pay attention to knowledge points ：
1.1 enable： stay serveroutput on Under the circumstances , Used to make dbms_output take effect ( Open by default )
1.2 disable： stay serveroutput on Under the circumstances , Used to make dbms_output invalid
1.3 put： Write content to memory , wait until put_line Output together
1.4 put_line： Needless to say , The output characters
1.5 new_line： As the end of a line , It can be understood as writing buffer Line break at

2.dbms_job package  --oracle Timing task
1. establish
grammar ：
variable jobno number;
dbms_job.submit(:jobno,'your_procedure;',next_date,'interval');

Syntax description ：
jobno--job Number   The system will automatically assign a task number jobno.

your_procedure -- Stored procedures executed , ';' Don't omit  

next_date -- Next execution time   

interval  -- Every time interval ,interval In days

2. Operation instructions
2.1 Delete job   dbms_job.remove(jobno);

2.2 Modify the action to be performed  job:dbms_job.what(jobno,what);

2.3 Modify the time to execute  dbms_job.next_date(jobno,next_date);

2.4 Modification interval      dbms_job.interval(jobno, interval);

2.4 start-up   dbms_job.run(jobno);  

2.5 stop it   dbms.broken(jobno, broken, nextdate); –broken by boolean value  
-- Stop paying attention ： First query job Number , know job Can't stop until the th .broken by true The execution stops . After stopping, you can use
select job, next_date, next_sec, failures, broken from user_jobs; When broken by y when , Has successfully stopped