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mysql> use information_schema;
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mysql> select count(1) as tables, concat(round(sum(table_rows)/1000000,2),'M') as rows, concat(round(sum(data_length)/(1024*1024*1024),2),'G') as data, concat(round(sum(index_length)/(1024*1024*1024),2),'G') as idx, concat(round(sum(data_length+index_length)/(1024*1024*1024),2),'G') as total_size,round(sum(index_length)/sum(data_length),2) as idxfrac from tables;
+--------+--------+--------+-------+------------+---------+
| tables | rows   | data   | idx   | total_size | idxfrac |
+--------+--------+--------+-------+------------+---------+
|    719 | 96.41M | 30.17G | 9.63G | 39.80G     |    0.32 |
+--------+--------+--------+-------+------------+---------+
1 row in set (1 min 9.64 sec)


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