Add Dump And Restore With A Single gzip File as a MongoDB TIL

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
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-_1263 TILs and counting..._
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@@ -521,6 +521,7 @@ _1263 TILs and counting..._
 
 - [Determine The Database Version](mongodb/determine-the-database-version.md)
 - [Dump A Remote Database](mongodb/dump-a-remote-database.md)
+- [Dump And Restore With A Single gzip File](mongodb/dump-and-restore-with-a-single-gzip-file.md)
 - [Get Size Stats For A Collection](mongodb/get-size-stats-for-a-collection.md)
 - [List Size Stats For All Collections](mongodb/list-size-stats-for-all-collections.md)
 

mongodb/dump-and-restore-with-a-single-gzip-file.md

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+# Dump And Restore With A Single gzip File
+
+The `mongodump` and `mongorestore` utilities provide a way for grabbing all the
+data from one database and putting it into another database. These commands are
+useful for transitioning production data to a database instance with more
+computing resources.
+
+The `--archive` and `--gzip` flags, supported by both commands, are what allow
+us to do the whole process with a single file. Without flags, `mongodump` will
+output multiple `.bson` files.
+
+Here is what the `mongodump` command might look like pointed at a remote URI:
+
+```bash
+mongodump \
+  --uri="mongodb+srv://<USER>:<PASSWORD>@<CLUSTER-HOST-URL>" \
+  --archive="myapp-dump.20221105.gz" \
+  --gzip
+```
+
+This will take a little while to run based on the size of the database. The
+result will be a file in your current directory with the name
+`myapp-dump.20221105.gz`. Because it is gzip'd, it will be a few times smaller
+than the standing database.
+
+To then load all the data into your new Mongo database cluster, you'll use
+`mongorestore` with all the same flags, making sure to swap out the destination
+URI details with those of the new instance.
+
+```bash
+mongorestore \
+  --uri="mongodb+srv://<USER>:<PASSWORD>@<NEW-CLUSTER-HOST-URL>" \
+  --archive="myapp-dump.20221105.gz" \
+  --gzip
+```
+
+For more details, see [Output an Archive
+File](https://www.mongodb.com/docs/database-tools/mongodump/#output-to-an-archive-file)
+and [Compress the
+Output](https://www.mongodb.com/docs/database-tools/mongodump/#compress-the-output).