Add Dump A Database To A File as a mysql til

README.md

@@ -10,7 +10,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 For a steady stream of TILs from a variety of rocketeers, checkout
 [til.hashrocket.com](https://til.hashrocket.com/).
 
-_537 TILs and counting..._
+_538 TILs and counting..._
 
 ---
 
@@ -232,6 +232,7 @@ _537 TILs and counting..._
 ### MySQL
 
 - [Display Output In A Vertical Format](mysql/display-output-in-a-vertical-format.md)
+- [Dump A Database To A File](mysql/dump-a-database-to-a-file.md)
 - [List Databases And Tables](mysql/list-databases-and-tables.md)
 - [Show Indexes For A Table](mysql/show-indexes-for-a-table.md)
 

mysql/dump-a-database-to-a-file.md

@@ -0,0 +1,20 @@
+# Dump A Database To A File
+
+The `mysqldump` client is a handy tool for creating a backup or snapshot of
+a MySQL database. The standard use of this command produces an alphabetical
+series of statements that comprise the structure and data of the specified
+database. It directs all of this to `stdout`. You'll likely want to redirect
+it to a file.
+
+```bash
+$ mysqldump my_database > my_database_backup.sql
+```
+
+The output will include special comments with MySQL directives that disable
+things like constraint checking. This is what allows the output to be in
+alphabetical order without necessarily violating any foreign key
+constraints.
+
+If you need to dump multiple databases, include the `--databases` flag with
+a space-separated list of database names. Or dump all of them with
+`--all-databases`.