#!/bin/bash

set -ue

q25="SELECT table_schema AS db, SUM( data_length + index_length ) AS db_size_bytes
  FROM information_schema.TABLES
  WHERE table_schema NOT IN ('performance_schema', 'information_schema', 'mysql')
  GROUP BY 1"

while true; do
  sleep ${s:-30}
  date
  mysql -D information_schema -e "$q25 ;" > /dev/null
done