Create mysql-output-tables-unused-sizes.md

Author: ticoombs

mysql/mysql-output-tables-unused-sizes.md

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+## Generates a table of the un-used space that can be gained from running "optimize" - [Optimize Table Mysql Docs](https://dev.mysql.com/doc/refman/5.7/en/optimize-table.html)
+
+```
+SELECT  table_schema, SUM(data_length + index_length + data_free)/1024/1024 AS total_mb, SUM(data_length)/1024/1024 AS data
+_mb, SUM(index_length)/1024/1024 AS index_mb, SUM(data_free)/1024/1024 AS free_mb, COUNT(*) AS tables, CURDATE() AS today  FROM  i
+nformation_schema.tables GROUP BY table_schema ORDER BY 5 DESC;
+```
+```
++---------------+--------------+--------------+-------------+--------------+--------+------------+
+| table_schema  | total_mb     | data_mb      | index_mb    | free_mb      | tables | today      |
++---------------+--------------+--------------+-------------+--------------+--------+------------+
+| table5        | 408.69756699 | 118.00054932 | 74.58203125 | 216.11498642 |    390 | 2018-04-20 |
+| table3        | 193.18750000 |  12.48437500 |  0.70312500 | 180.00000000 |     19 | 2018-04-20 |
+| table2        | 155.76910400 |  22.96760559 | 18.75390625 | 114.04759216 |    390 | 2018-04-20 |
+| table1        | 185.29894257 |  40.49063492 | 38.74316406 | 106.06514359 |    401 | 2018-04-20 |
+
+```
+