Locking in SQL Server 

This video is a brief information about locking in SQL server: what is locking, how many types are there and how do they work.
Agenda:
1. What is locking?
2. Why do we need locking?
3. Major locking types and how they work (with live demo)
To check blocking sessions, use:
SELECT
request_session_id,
resource_type,
resource_description,
request_mode,
request_type,
request_status
FROM sys.dm_tran_locks
SELECT
session_id,
wait_duration_ms,
wait_type,
blocking_session_id,
resource_description
FROM sys.dm_os_waiting_tasks
SELECT
session_id,
status,
wait_type,
wait_time,
wait_resource,
command
FROM sys.dm_exec_requests
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