From af7cf4a0a0ac0d59eca65025f3a833a6b3144677 Mon Sep 17 00:00:00 2001
From: Jake Howard <git@theorangeone.net>
Date: Wed, 7 Oct 2020 17:41:28 +0100
Subject: [PATCH] Add some notes about killing long running queries etc

---
 notes/psql/long-running-queries.md | 38 +++++++++++++++++++++++++++
 notes/psql/running-queries.md      | 42 ++++++++++++++++++++++++++++++
 2 files changed, 80 insertions(+)
 create mode 100644 notes/psql/long-running-queries.md
 create mode 100644 notes/psql/running-queries.md

diff --git a/notes/psql/long-running-queries.md b/notes/psql/long-running-queries.md
new file mode 100644
index 0000000..20c3085
--- /dev/null
+++ b/notes/psql/long-running-queries.md
@@ -0,0 +1,38 @@
+---
+title: Find and kill long running queries
+tags:
+  - PostgreSQL
+link: https://medium.com/little-programming-joys/finding-and-killing-long-running-queries-on-postgres-7c4f0449e86d
+---
+
+# Running queries
+
+View a list of queries running longer than 5 minutes:
+
+```sql
+SELECT
+  pid,
+  now() - pg_stat_activity.query_start AS duration,
+  query,
+  state
+FROM pg_stat_activity
+WHERE (now() - pg_stat_activity.query_start) > interval '5 minutes';
+```
+
+Also see [running queries](../running-queries).
+
+# Stopping a given connection
+
+```sql
+SELECT pg_cancel_backend(pid);
+```
+
+`pid` being the relevant value from `pg_stat_activity.pid`.
+
+# Killing a given connection
+
+```sql
+SELECT pg_terminate_backend(pid);
+```
+
+Should be avoided, as it's synonymous with `kill -9`.
diff --git a/notes/psql/running-queries.md b/notes/psql/running-queries.md
new file mode 100644
index 0000000..2ab1968
--- /dev/null
+++ b/notes/psql/running-queries.md
@@ -0,0 +1,42 @@
+---
+title: Monitor running queries
+tags:
+  - PostgreSQL
+link: https://techmango.org/2017/11/04/monitor-running-queries-postgresql/
+---
+
+View a list of running queries:
+
+```sql
+SELECT
+  datname,
+  pid,
+  usename,
+  client_addr,
+  client_port,
+  xact_start,
+  backend_start,
+  query_start,
+  state,
+  query
+FROM pg_stat_activity
+ORDER BY query_start ASC
+```
+
+View list of non-idle connections:
+
+```sql
+SELECT
+  datname,
+  pid,
+  usename,
+  client_addr,
+  client_port,
+  xact_start,
+  backend_start,
+  query_start
+FROM pg_stat_activity
+WHERE
+  state != 'idle'
+ORDER BY query_start ASC
+```