From 89a8745430c7f2796c8fad2304e23b6c843714ab Mon Sep 17 00:00:00 2001
From: kirby <kirby@hyrule.ovh>
Date: Wed, 21 May 2025 09:12:31 +0200
Subject: [PATCH] adding postgresql

---
 postgresql/cli.md | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 postgresql/cli.md

diff --git a/postgresql/cli.md b/postgresql/cli.md
new file mode 100644
index 0000000..beaa777
--- /dev/null
+++ b/postgresql/cli.md
@@ -0,0 +1,28 @@
+### Get list of users and numbers of active connections
+
+```sql
+SELECT
+    datname AS database_name,
+    usename AS user_name,
+    count(*) AS active_connections
+FROM pg_stat_activity
+GROUP BY datname, usename order by active_connections DESC;
+```
+
+### Limit number of connections for user
+
+```sql
+alter user keycloak connection limit 80;ALTER ROLE
+```
+
+### Remove limit number of connections for user
+
+```sql
+alter user keycloak connection limit -1;ALTER ROLE
+```
+
+### Get replication status
+
+```sql
+select * from pg_stat_replication;
+```