Shared Lock

Shared locks allow concurrent transactions to read a resource. No other transactions can modify the data while shared locks exist on the resource. Shared locks on a resource are released as soon as the data has been read, unless the transaction isolation level is set to repeatable read or higher, or a locking hint is used to retain the shared locks for the duration of the transaction. Used for operations that do not change or update data (read-only operations), such as a SELECT statement.