Update cheatsheets

tldr/clusterdb

@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# clusterdb
+
+> Cluster (reorganize) a PostgreSQL database.
+> More information: <https://www.postgresql.org/docs/current/app-clusterdb.html>.
+
+- Cluster a specific database:
+
+`clusterdb {{database_name}}`
+
+- Cluster all databases:
+
+`clusterdb {{[-a|--all]}}`
+
+- Cluster a specific table in a database:
+
+`clusterdb {{[-t|--table]}} {{table_name}} {{database_name}}`