AG> Why don't you just do:
AG> $ mysqldump --ignore-table=my_database.wiki_objectcache AG> --ignore-table=my_database.wiki_searchindex my_database
OK, but then the structure of those tables are gone from the dump too, not just their contents. We cannot thus recover from scratch straight from the SQL dump. But perhaps we then can immediately run a maintenance script to recreate the missing tables' structure?