The wb_changes table on wikidatawiki reached 1GB today. As this is currently not used, it's wasted space, and truncating the table doesn't free the used disk space (dropping and reimporting the database would be necessary). However, truncating it will mean the space on will not grow until the tables once again fill all that disk space.
On this note, it'd be really handy to have a global to disable/enable writing to that table. In the current setup, this is un-needed and unused, and according to Denny, is subject to major change soon. It does save numerous of large insert statements to the master, saving some overhead
Version: unspecified
Severity: enhancement