Locking in database

Question

Hi I want to know that  Is locking is the good practice on a database part and if yes then how can i put the locks on the database ?

Datta Kharad · Answer

Hi Yes because of database Deadlocks occur when 2 or more transactions hold dependent locks and neither can continue until the other releases. Below is a simple illustration of a deadlock. Time User 1 Actions User 2 Actions 1 Starts Transaction 2 Starts Transaction 3 Updates row 2 in table A 4 Updates row 10 in table B 5 Attempts to update row 10 in table B U1 Is Blocked by U2 6 Attempts to update row 2 in table A U1 Is Blocked by U2U2 Is Blocked by U1 DEADLOCK!!! This example is the simplest type. Deadlocks can be much more complicated involving different types of locks and involving more than 2 sessions. The good news is that the DBMS will recognize these situations and resolve them. The DBMS will choose one victim and roll back their transaction. The DBMS tends to choose the victim by determining which transaction will be easiest to roll back. However unless the application is designed to react to deadlock errors and retry there will be a negative end-user impact. Deadlocks generally lead to intermittent errors. They are almost always caused by application logic problems. These generally occur when the application does not access data in a consistent sequence. They are also very timing and data dependent which can make them very hard to reproduce. //For more detail refer below article:- http://www.c-sharpcorner.com/uploadfile/shivprasadk/6-ways-of-doing-locking-in-net-pessimistic-and-optimistic/