Add Dump A Database To A File as a mysql til

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

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+# 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`.