Oracle certification, installation, and database Classification

Oracle databases are currently used by most enterprises.

1. Oracle Certification

 

2. Default oracle users

After the Oracle database is successfully installed, three users are generated by default.

(1). sys User: Super Administrator with the highest permissions: sysdba and create database. The default password of this user is change_on_install.

(2). System User: a management operator with high permissions. Has the sysoper role and does not have the create database permission. The default password is Manager.

(3) Scott User: common user. The default password is Tiger.

In the process of daily Oracle management, it is enough to use the System user.

 

3. Database Classification

Currently, common databases include access, MySQL, SQL Server, Sybase, DB2, Oracle, FOXBASE, and Informix. These databases can be classified into small, medium, and large databases.