Delete the cache table content.
Gallery keeps a cache table with various info to help with the speed of the site. This module will truncate the caches table.
This module adds a new task to the maintenance page to truncate the caches table for the database.
This module may be downloaded from the Gallery modules here.
To install, extract the "delete_cache" folder from the zip file into your Gallery 3 modules folder.
Afterwards log into your Gallery web site as an administrator and activate the module in the Admin -> Modules menu.
Now you will have a new task in the maintenance page. Click run and the task will run and tell you how many rows that where truncated..