Running multiple database servers on the same computer is not as efficient as running one database server. You need to balance the advantages of separate database servers against the extra performance cost.
When you plan for multiple residency on a computer, consider the following factors:
Each database server needs its own memory. Can your computer handle the memory usage that an additional database server requires?
Each database server must have its unique storage space. You cannot use the same disk space for more than one instance of a database server. When you prepare an additional database server, you must repeat some of the planning that you did to install the first database server. For example, consider these questions: