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You can find the updated Miva 10 Reference Guide here
Some modules have the ability to create their own log files, usually for troubleshooting. Use the Logging Settings screen to turn log file creation on or off for any module.
By default there are three modules in your Miva Merchant store that can create log files. However, if you purchase a third-party module it may also have a log file feature, and will show up in the Logging Settings screen.
Log files have the potential to use up a lot of space on your server. If you enable a log file, you might want to keep an eye on how much disk space it uses over time.
Urchin was purchased by Google and became Google Analytics. Urchin is no longer a supported product, although it still works. If you use Urchin, you have to enable the e-urchin log.
This is a general purpose log file to help troubleshoot your store. It can quickly capture a large amount of data and you should keep an eye on the size of the log file.
buySAFE is a product that allows your customers to add insurance to their orders. You should only enable the buySAFE log if you are asked to do so by their support staff. Enabling the buySAFE log does not create a new tab and their log file does not have any options.