Flush and flushing have several meanings: Contents. [hide]. 1 Places; 2 Architecture, Computing. Allocate-on- flush, a computer file system; Cache flush, when a CPU cache is emptied. A buffer flush is the transfer of computer data from a temporary storage area to the computer's permanent memory. The following article explains how to flush a computer's DNS cache. When a computer visits a website for the first time, it stores the website's DNS information in. When a computer visits a website for the first time, it stores the website's DNS information in cache. You have exceeded the maximum character limit. Type in the following command at the command prompt: This disambiguation page lists articles associated with the title Flush. Social media mistakes can bring down an organization as easily as a technical disruption .