In order to see when was your latest update in your table, you can use the following sql query to get the latest record:
SELECT * FROM table_name
WHERE date = (SELECT MAX(date) FROM table_name);
Just change table_name and date field with the correct table name and the field that include the date modification in your table
Notes
- To get the current size of all tables in your Database or get the size of all databases you can use the following: Mysql-Get-Database-And-Tables-Size