Oracle 10g Express Edition
To prevent production abuse, Oracle imposed clear limits on 10g XE:
Oracle 10g Express Edition is a free, limited edition of the Oracle Database 10g, which is a popular relational database management system (RDBMS) developed by Oracle Corporation. Released in 2005, Oracle 10g Express Edition (XE) is designed for small-scale applications, development, and testing environments, providing a robust and feature-rich database platform at no cost. oracle 10g express edition
XE also includes a simplified listener ( TNSLSNR ) on port 1521 (default) and an HTTP listener for APEX on port 8080 . To prevent production abuse, Oracle imposed clear limits