Oracle version evolution history: Follow the development of Oracle versions and grasp the latest trends!

Oracle version evolution history: Follow the development of Oracle versions and grasp the latest trends!

Oracle database is the world's leading enterprise-level database management system. It has experienced decades of development and evolution, and continuously launches new versions to adapt to changing needs and technology trends. This article will take you back to review the evolution history of Oracle database versions and help you grasp the latest technology trends.

1. Oracle 7

Oracle 7 was released in 1992 and introduced many important new features, such as PL/SQL stored procedures, triggers, cursors, etc. The following is a simple PL/SQL stored procedure example:

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;
/

2. Oracle 9i

Oracle 9i was released in 2001 and introduced new features such as automatic garbage collection, which is extremely Dramatically improve database performance and manageability. The sample code is shown below, showing how to create an automatic garbage collection job:

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;
/

3. Oracle 12c

Oracle 12c was released in 2013 and introduced many innovative features , such as multi-tenant architecture, data red-black tree index, etc. The following is an example of using a data red-black tree index:

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

4. Oracle 19c

Oracle 19c is the latest Oracle database version, released in 2019. It introduces many new features such as automatic index tuning, automatic data optimization, etc. The following is an example of automatic index adjustment:

ALTER SESSION SET OPTIMIZER_ADAPTIVE_PLANS = TRUE;

Through these evolutionary history cases, we can see that Oracle database continues to innovate and progress in technology, providing more efficient database management and application support. As technology continues to develop, Oracle Database will continue to update versions to meet users' changing needs and challenges. Let us follow the development of Oracle versions and grasp the latest technology trends!

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