gistfile1.txt

mysql> SELECT
    ->        sum(stat_value) pages,
    ->        index_name,
    ->        sum(stat_value) * @@innodb_page_size size
    -> FROM
    ->        mysql.innodb_index_stats
    -> WHERE
    ->            table_name LIKE 'locales_source'
    ->        AND database_name = 'd8'
    ->        AND stat_description LIKE 'Number of pages in the index'
    -> GROUP BY
    ->        index_name;
+-------+----------------+---------+
| pages | index_name     | size    |
+-------+----------------+---------+
|    97 | PRIMARY        | 1589248 |
|    97 | source_context | 1589248 |
+-------+----------------+---------+
2 rows in set (0.00 sec)
mysql> select count(0) from locales_source;
+----------+
| count(0) |
+----------+
|    13803 |
+----------+
1 row in set (0.11 sec)