Several .db files are created by the ClickstreamReactor and Analytics Reactors and are stored in the "data" subdirectory of the main installation directory (or "/var/lib/pion" on Redhat Linux"). These are used to track repeat visitors to your website and to map your website cookies to those used by your third-party analytics provider, respectively. Pion includes a "purge_cookies.pl" command-line Perl script that can be run periodically to prune old entries from these database files. The syntax is "purge_cookies.pl "

Pion Replay also creates .db files within your "data" directory to store the information from visitor sessions captured. Pion Replay automatically prunes old data to keep a "rolling window" of the most recent activity, based on the storage space defined in the MultiDatabaseReactor configuration.