artificial delay with the DBMS_LOCK.SLEEP procedure : dbms_lock « System Packages « Oracle PL/SQL Tutorial

1. Oracle PL/SQL Tutorial
2. System Packages
3. dbms_lock

SQL>
SQL>
SQL>
SQL> create table employees(
  2    empno      NUMBER(4)
  3  , ename      VARCHAR2(8)
  4  , init       VARCHAR2(5)
  5  , job        VARCHAR2(8)
  6  , mgr        NUMBER(4)
  7  , bdate      DATE
  8  , msal       NUMBER(6,2)
  9  , comm       NUMBER(6,2)
 10  , deptno     NUMBER(2) ) ;

Table created.

SQL>
SQL>
SQL> insert into employees values(1,'Jason',  'N',  'TRAINER', 2,   date '1965-12-18',  800 , NULL,  10);

1 row created.

SQL> insert into employees values(2,'Jerry',  'J',  'SALESREP',3,   date '1966-11-19',  1600, 300,   10);

1 row created.

SQL> insert into employees values(3,'Jord',   'T' , 'SALESREP',4,   date '1967-10-21',  1700, 500,   20);

1 row created.

SQL> insert into employees values(4,'Mary',   'J',  'MANAGER', 5,   date '1968-09-22',  1800, NULL,  20);

1 row created.

SQL> insert into employees values(5,'Joe',    'P',  'SALESREP',6,   date '1969-08-23',  1900, 1400,  30);

1 row created.

SQL> insert into employees values(6,'Black',  'R',  'MANAGER', 7,   date '1970-07-24',  2000, NULL,  30);

1 row created.

SQL> insert into employees values(7,'Red',    'A',  'MANAGER', 8,   date '1971-06-25',  2100, NULL,  40);

1 row created.

SQL> insert into employees values(8,'White',  'S',  'TRAINER', 9,   date '1972-05-26',  2200, NULL,  40);

1 row created.

SQL> insert into employees values(9,'Yellow', 'C',  'DIRECTOR',10,  date '1973-04-27',  2300, NULL,  20);

1 row created.

SQL> insert into employees values(10,'Pink',  'J',  'SALESREP',null,date '1974-03-28',  2400, 0,     30);

1 row created.

SQL>
SQL>
SQL>
SQL>
SQL> create table e as select * from employees;

Table created.

SQL>
SQL> alter session set NLS_TIMESTAMP_FORMAT='DD-MON-YYYY HH24:MI:SS.FF3';

Session altered.

SQL>
SQL> select localtimestamp as table_created  from dual;

TABLE_CREATED
---------------------------------------------------------------------------
24-JUL-2008 19:12:49.573

1 row selected.

SQL>
SQL> execute dbms_lock.sleep(42);

PL/SQL procedure successfully completed.

SQL> update e
  2  set    msal = msal + 10;

10 rows updated.

SQL> commit;

Commit complete.

SQL>
SQL>
SQL> select localtimestamp as after_update_1 from dual;

AFTER_UPDATE_1
---------------------------------------------------------------------------
24-JUL-2008 19:13:31.809

1 row selected.

SQL>
SQL> execute dbms_lock.sleep(16);

PL/SQL procedure successfully completed.

SQL> update e
  2  set    msal = msal - 20
  3  where  deptno = 10;

2 rows updated.

SQL> commit;

Commit complete.

SQL> select localtimestamp as after_update_2 from dual;

AFTER_UPDATE_2
---------------------------------------------------------------------------
24-JUL-2008 19:13:48.022

1 row selected.

SQL>
SQL> execute dbms_lock.sleep(42);

PL/SQL procedure successfully completed.

SQL> delete from e
  2  where  deptno <= 20;

5 rows deleted.

SQL> commit;

Commit complete.

SQL> select localtimestamp now               from dual;

NOW
---------------------------------------------------------------------------
24-JUL-2008 19:14:30.238

1 row selected.

SQL>
SQL>
SQL>
SQL> drop table e;

Table dropped.

SQL>
SQL> drop table employees;

Table dropped.

SQL>
SQL>