how to get mysql table size in GB

Question

Just ended up with calculating the size of MySQL table in GB with the following query.

SELECT (data_length+index_length)/power(1024,3) tablesize_gb FR

Answer 1

To calculate the size of a row, use length() method.

For example:

MariaDB [db]> select id,length(row_to_calcsize) from tablename order by id desc limit 2\G
*************************** 1. row ***************************
     id: 501
length(row_to_calcsize): 2192911
*************************** 2. row ***************************
     id: 500
length(row_to_calcsize): 51657
2 rows in set (0.00 sec)

MariaDB [db]> 

To calculate size in GB, just divide it 3 times per 1024

length(row_to_calcsize)/1024/1024/1024