It is better to call shell command (having multiple spaces) by passing all arguments using a string array.
MOD_PLSQL is an Oracle HTTP Server (Apache) extension module that allows developers to create dynamic web pages from PL/SQL packages and stored procedures within the database. It is ideal for developing fast and flexible applications that can run on the Internet or an Intranet.
Oracle Application Express (Oracle APEX) is a rapid web application development tool for the Oracle database. Using only a web browser and limited programming experience, you can develop and deploy professional applications that are both fast and secure.