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Add Get The Size of A Database as a postgres til

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# Get The Size Of A Database
If you have connect access to a database, you can use the
`pg_database_size()` function to get the size of a database in bytes.
```sql
> select pg_database_size('hr_hotels');
pg_database_size
------------------
8249516
```
Just give it the name of the database and it will tell you how much disk
space that database is taking up.
Checkout [the Postgres docs](http://www.postgresql.org/docs/current/static/functions-admin.html) for more details.