Show largest tables (optionally, in a specific DB)

mysql-largest-tables.sh

#!/bin/bash

if [ -z $1 ] ; then
  SQL="
  SELECT
         CONCAT(table_schema, '.', table_name)                                          'Table',
         CONCAT(ROUND(( data_length + index_length ) / ( 1024 * 1024 * 1024 ), 2), 'G') 'Tot Size',
         CONCAT(ROUND(table_rows / 1000000, 2), 'M')                                    'Rows',
         CONCAT(ROUND(data_length / ( 1024 * 1024 * 1024 ), 2), 'G')                    'Data',
         CONCAT(ROUND(index_length / ( 1024 * 1024 * 1024 ), 2), 'G')                   'Idx',
         ROUND(index_length / data_length, 2)                                           'Idx Frac'
  FROM   information_schema.TABLES
  ORDER  BY data_length + index_length DESC
  LIMIT  10;
  "
else
  SQL="
  SELECT
         CONCAT(table_schema, '.', table_name)                                          'Table',
         CONCAT(ROUND(( data_length + index_length ) / ( 1024 * 1024 * 1024 ), 2), 'G') 'Tot Size',
         CONCAT(ROUND(table_rows / 1000000, 2), 'M')                                    'Rows',
         CONCAT(ROUND(data_length / ( 1024 * 1024 * 1024 ), 2), 'G')                    'Data',
         CONCAT(ROUND(index_length / ( 1024 * 1024 * 1024 ), 2), 'G')                   'Idx',
         ROUND(index_length / data_length, 2)                                           'Idx Frac'
  FROM   information_schema.TABLES
  WHERE  table_schema = '$1'
  ORDER  BY data_length + index_length DESC
  LIMIT  10;
  "
fi

mysql -e "$SQL"