diff --git a/README.md b/README.md
index 8416b29..86d58a9 100644
--- a/README.md
+++ b/README.md
@@ -219,6 +219,10 @@ For instance, take into account the snaptshot above. If you already know how to
               * [PostgreSQL Replication by example - Kobus Wolvaardt](https://www.youtube.com/watch?v=5BeC1aD4z8E) 📼 🆓 ⭐️
             * Monitoring
               * [Key metrics for Amazon RDS PostgreSQL monitoring](https://www.datadoghq.com/blog/aws-rds-postgresql-monitoring/) 📰 🆓
+            * Operating
+              * Vacuum
+                * [Optimizing Storage and Managing Cleanup in PostgreSQL - Harshit Dwivedi](https://medium.com/coding-blocks/optimizing-storage-and-managing-cleanup-in-postgresql-c2fe56d4cf5) ⭐️ 📰 🆓
+                * [Optimizing, monitoring, and troubleshooting VACUUM operations in PostgreSQL - GCP](https://cloud.google.com/solutions/optimizing-monitoring-troubleshooting-vacuum-operations-postgresql.pdf) 📰 🆓
           * MySQL
             * [Learn to stop using shiny new things and love MySQL](https://medium.com/@Pinterest_Engineering/learn-to-stop-using-shiny-new-things-and-love-mysql-3e1613c2ce14) 📰 🆓
             * [Tracking the Money — Scaling Financial Reporting at Airbnb](https://medium.com/airbnb-engineering/tracking-the-money-scaling-financial-reporting-at-airbnb-6d742b80f040) 📰 🆓
diff --git a/resources/topic-graph.mmd b/resources/topic-graph.mmd
index d924f90..1bb400e 100644
--- a/resources/topic-graph.mmd
+++ b/resources/topic-graph.mmd
@@ -46,7 +46,12 @@ graph TD
       DB --> SQL[SQL]
         SQL --> rSQL[Row-oriented]
           rSQL --> PgSQL
+            PgSQL --> rSQLRep[Replication]
+            PgSQL --> rSQLOps[Operating]
+              rSQLOps --> rSQLOpsVac[Vacuum]
           rSQL --> MySQL
+            MySQL --> mSQLRep[Replication]
+            MySQL --> mSQLOps[Operating]
         SQL --> cSQL[Column-oriented]
           cSQL --> Redshift
       DB --> NoSQL[NoSQL]
diff --git a/resources/topic-graph.png b/resources/topic-graph.png
index a0a2d92..d956441 100644
Binary files a/resources/topic-graph.png and b/resources/topic-graph.png differ