Example of how to check the capacity of MySQL database table

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;

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'; 

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;