Hi not sure if my error is related however my site has come to a grinding holt with the following errors in the server logs:
[Tue Jun 02 11:56:18 2015] [error] [client] AH01215: WordPress database error Lock wait timeout exceeded; try restarting transaction for query DELETE FROM wp_options WHERE option_name LIKE '_transient_timeout_wpseo_sitemap_cache_product_%' made by do_action('wp_ajax_heartbeat'), call_user_func_array, wp_ajax_heartbeat, apply_filters('heartbeat_received'), call_user_func_array, heartbeat_autosave, wp_autosave, edit_post, wp_update_post, wp_insert_post, do_action('save_post'), call_user_func_array, wpseo_invalidate_sitemap_cache_on_save_post, wpseo_invalidate_sitemap_cache, WPSEO_Utils::clear_sitemap_cache
Please could you advise how to fix this issue? I have no clue other than the WPSEO mentioned in the above!