Clickthrough URLs and Disk Caching

When Aurea List Manager gets a clickthrough, it caches the destination URL on disk and in memory so that when future clickthroughs for the same URLs occur, it will not be necessary to look up the URLs in the database again. The most recently-used clickthrough URLs are stored in memory, and every URL that has been looked up before is backed up on disk. Disk storage requirements may vary, but 1k per cached URL is typical. If you have large numbers of distinct clickthrough URLs, you must ensure that you have sufficient disk space to cache them and monitor your disk space regularly.

The location of the URL cache is determined by the configuration parameter "urlcache_directory" in tclhttpd.rc, which defaults to $Config(home)/urlcache. If this is not a convenient location due to administration issues or available disk space, you can change this parameter to a more suitable value.

The disk cache continues to grow as mailings with new URLs are created and more clickthroughs occur. The cache can be cleared at any time with no side effects. The system will periodically (every $Config(urlcache_monitor_interval)) check for new URLs and add them to the disk cache as they are found. In addition, on system startup, the webserver automatically caches up to 10,000 of the most recently created URLs in anticipation of their use.