Mysql query database capacity method steps

mysql> use information_schema;
mysql> select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data from TABLES;
+-----------+
| data |
+-----------+
| 3052.76MB |
+-----------+
1 row in set (0.02 sec)

SELECT
SUM(AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH)/1024/1024 AS total_mb
FROM information_schema.TABLES

SELECT
table_schema,SUM(AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH)/1024/1024 AS total_mb
FROM information_schema.TABLES group by table_schema;

mysql> use information_schema;
mysql> select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data from TABLES where table_schema='test';
+----------+
| data |
+----------+
| 142.84MB |
+----------+
1 row in set (0.00 sec)

select
table_schema as 'database',
sum(table_rows) as 'Number of records',
sum(truncate(data_length/1024/1024, 2)) as 'Data capacity (MB)',
sum(truncate(index_length/1024/1024, 2)) as 'Index capacity (MB)'
from information_schema.tables
group by table_schema
order by sum(data_length) desc, sum(index_length) desc;

select
table_schema as 'database',
table_name as 'table name',
table_rows as 'number of records',
truncate(data_length/1024/1024, 2) as 'Data capacity (MB)',
truncate(index_length/1024/1024, 2) as 'Index capacity (MB)'
from information_schema.tables
order by data_length desc, index_length desc;

Example: Check the capacity of the MySQL database select
table_schema as 'database',
sum(table_rows) as 'Number of records',
sum(truncate(data_length/1024/1024, 2)) as 'Data capacity (MB)',
sum(truncate(index_length/1024/1024, 2)) as 'Index capacity (MB)'
from information_schema.tables
where table_schema='mysql';　

Example: Check the capacity of each table in the MySQL database select
table_schema as 'database',
table_name as 'table name',
table_rows as 'number of records',
truncate(data_length/1024/1024, 2) as 'Data capacity (MB)',
truncate(index_length/1024/1024, 2) as 'Index capacity (MB)'
from information_schema.tables
where table_schema='mysql'
order by data_length desc, index_length desc;