From f9ed2bf0de9c1000d26a9554e58e1e80071b9067 Mon Sep 17 00:00:00 2001
From: Michael Hoennig <michael@hoennig.de>
Date: Wed, 31 Jul 2024 13:27:28 +0200
Subject: [PATCH] add performance analysis query

---
 doc/rbac-performance-analysis.md | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/doc/rbac-performance-analysis.md b/doc/rbac-performance-analysis.md
index b3a578b7..0e5fce45 100644
--- a/doc/rbac-performance-analysis.md
+++ b/doc/rbac-performance-analysis.md
@@ -111,7 +111,23 @@ time gw-importHostingAssets
 
 ### Fetch the Query Statistics
 
-And afterward we can query the statistics in PostgreSQL:
+And afterward we can query the statistics in PostgreSQL, e.g.:
+
+```SQL
+WITH statements AS (
+    SELECT * FROM pg_stat_statements pss
+)
+SELECT calls,
+    total_exec_time::int/(60*1000) as total_exec_time_mins,
+    mean_exec_time::int as mean_exec_time_millis, 
+    query
+FROM statements
+WHERE calls > 100 AND shared_blks_hit > 0
+ORDER BY total_exec_time_mins DESC
+LIMIT 16;
+```
+
+### Reset the Query Statistics
 
 ```SQL
 SELECT pg_stat_statements_reset();