--- a/oracle.rst	Mon Oct 15 19:51:13 2018 +0300
+++ b/oracle.rst	Sun Oct 21 13:22:58 2018 +0300
@@ -331,6 +331,37 @@
 
   show parameter user_dump_dest;
 
+Sessions and locks
+==================
+
+Select locked objects::
+
+  select * from v$locked_object;
+
+  select * from v$locked_object a, all_objects b
+    where a.object_id = b.object_id;
+
+  select b.owner, b.object_name, a.oracle_username, a.os_user_name
+    from v$locked_object a, all_objects b
+    where a.object_id = b.object_id;
+
+  select
+     c.owner,
+     c.object_name,
+     c.object_type,
+     b.sid,
+     b.serial#,
+     b.status,
+     b.osuser,
+     b.machine
+  from v$locked_object a, v$session b, dba_objects c
+  where b.sid = a.session_id and a.object_id = c.object_id;
+
+Kill session::
+
+  alter system kill session 'SID,SERIAL#';
+  alter system kill session '361,565';
+
 Installing express edition
 ==========================