From 385a3b98ca8064af936a5089170c929fa3abeae2 Mon Sep 17 00:00:00 2001
From: Michael Schlapa <michael.schlapa@uni-duesseldorf.de>
Date: Wed, 17 Nov 2021 11:48:47 +0100
Subject: [PATCH] Add postgres - processlist and locks

---
 postgresql.md | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/postgresql.md b/postgresql.md
index 60538b8..1b4926d 100644
--- a/postgresql.md
+++ b/postgresql.md
@@ -31,4 +31,34 @@ $ createdb -O <OWNER> <DBNAME>
 \c <DB>     connect to a database
 \dt         list tables
 \d <TABLE>  describe table
-```
\ No newline at end of file
+\df         list functions
+\dy         list trigger
+```
+
+## Find and kill query process
+
+To get a list of all currently running query process (like `SHOW FULL PROCESSLIST` from MySQL) enter:
+
+```sql
+SELECT * FROM pg_stat_activity;
+```
+
+If you know the name of the database you can filter with it like so:
+
+```sql
+SELECT * FROM pg_stat_activity WHERE datname= '<database name>';
+```
+
+With the entry of the `pid` column you can terminate or kill the process:
+
+```sql
+SELECT pg_cancel_backend(<pid>);  # Stop gracefully
+SELECT pg_terminate_backend(<pid>);  # Kill
+```
+
+## View locks
+
+```sql
+SELECT * FROM pg_locks;
+```
+