Oracle版本演变史：跟随Oracle版本发展脉络，掌握最新动向！

CREATE OR REPLACE PROCEDURE get_employee_name (employee_id IN INTEGER) AS
  employee_name VARCHAR2(50);
BEGIN
  SELECT first_name INTO employee_name
  FROM employees
  WHERE employee_id = employee_id;
  DBMS_OUTPUT.PUT_LINE('Employee name: ' || employee_name);
END;
/

BEGIN
  DBMS_SCHEDULER.CREATE_JOB(
    job_name        => 'PURGE_LOGS_JOB',
    job_type        => 'PLSQL_BLOCK',
    job_action      => 'BEGIN
                         DBMS_STATS.PURGE_LOG;
                       END;',
    start_date      => SYSTIMESTAMP,
    repeat_interval => 'FREQ=DAILY;BYHOUR=2;BYMINUTE=0;BYSECOND=0',
    end_date        => NULL,
    enabled         => TRUE
  );
END;
/

CREATE INDEX idx_employee_age
ON employees (age)
TABLESPACE users
VISIBLE
LOCAL
INDEX ORGANIZATION IS RTREE;

ALTER SESSION SET OPTIMIZER_ADAPTIVE_PLANS = TRUE;