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MYSQL ERROR: Out of resources when opening file '/tmp/#sql_12219f_0.MAI' (Errcode: 24 "Too many open files")

Query: SELECT *, SUM(co_price) AS this_price, COUNT(co_id) AS total_items FROM ms_cart LEFT JOIN ms_cart_options ON ms_cart_options.co_cart_id=ms_cart.cart_id WHERE cart_session='54162153120180924015426' AND cart_client='' AND cart_order<='0' AND co_pic_id>'0' GROUP BY co_opt_name