Detailed explanation of Oracle versions: from early to latest, analyze them one by one!

Oracle database is the world's leading enterprise-level relational database management system, which has been continuously evolving and upgrading since its inception. This article will analyze the Oracle database one by one from the early versions to the latest version, explore the characteristics and functional changes of each version, and provide some specific code examples for demonstration.

Oracle 7

Oracle 7 released in 1992 is a milestone version of the Oracle database. It introduced many important features, such as PL/SQL programming language, cursors and stored procedures. The following is a simple PL/SQL stored procedure example:

CREATE OR REPLACE PROCEDURE hello_world IS
BEGIN
  DBMS_OUTPUT.PUT_LINE('Hello, World!');
END;
/

Oracle 8i

Oracle 8i released in 1997 is the first database version to support the Internet, i stands for Internet, this version introduced Oracle Real Application Clusters (RAC) and built-in JVM support for Java. The following is a simple Java stored procedure example:

CREATE OR REPLACE AND COMPILE JAVA SOURCE NAMED "HelloWorld" AS
public class HelloWorld {
  public static String helloWorld() {
    return "Hello, World!";
  }
};
/

Oracle 10g

Oracle 10g released in 2003 introduced innovative features such as Grid Computing and Automatic Storage Management (ASM), which improved the performance of the database. Flexibility and manageability. The following is a simple ASM example:

CREATE DISKGROUP data NORMAL REDUNDANCY
  DISK '/dev/sdb1',
  '/dev/sdc1'
ATTRIBUTE 'au_size'='4M';

Oracle 11g

Oracle 11g released in 2007 introduced many new features, such as data compression, self-service management, and Partitioning. The following is a simple data compression example:

ALTER TABLE employees COMPRESS FOR ALL OPERATIONS;

Oracle 12c

Oracle 12c released in 2013 is the latest major version of Oracle database, which introduces many new features such as Multitenant Architecture, In -Memory Column Store and Pluggable Databases, etc. The following is a simple example of creating a Pluggable Database:

CREATE PLUGGABLE DATABASE pdb1 ADMIN USER admin1 IDENTIFIED BY password1
  ROLES=(DBA)
  DEFAULT TABLESPACE users
  DATAFILE '/u01/app/oracle/oradata/cdb1/pdb1_1.dbf' SIZE 100M
  FILE_NAME_CONVERT=('/u01/app/oracle/oradata/pdbseed', '/u01/app/oracle/oradata/cdb1');

Summary

Through the above analysis of different versions of Oracle database, we can see that Oracle is constantly evolving and innovating, and each new version Brings more powerful features and performance optimizations. For developers and administrators who use Oracle database, understanding the features and functional changes of each version can better utilize the advantages of the database and improve work efficiency.

In practical applications, by combining specific code examples, developers can better understand and apply the various functions of Oracle database, thereby better completing various database operations and optimization. As Oracle database continues to develop, I believe it will continue to occupy an important position in the enterprise-level database management system market and bring more innovation and value to users.

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