Swap space in Linux is used when the amount of physical memory (RAM) is full. If the system needs more memory resources and the RAM is full, inactive pages in memory are moved to the swap space. While swap space can help machines with a small amount of RAM, it should not be considered a replacement for more RAM.
Change a Password for MySQL on Linux via Command Line
Apache Tomcat is an open-source web server that is designed to serve Java web pages. It is widely deployed and powers various mission-critical web applications around the world.