What kind of access does an Exclusive Lock deny?

An Exclusive Lock is designed to provide the highest level of data protection by preventing any other sessions or transactions from accessing the locked resource in any way. When an Exclusive Lock is placed on a resource (such as a table or row), it prevents all other lock types from accessing that resource, meaning no other transactions can perform reads, writes, or any other operations. This makes it an essential mechanism for ensuring data integrity during critical transactions that require a complete isolation of the data being operated on.

Because of the nature of the Exclusive Lock, it effectively prohibits other sessions from obtaining either Read or Write access to the resource until the lock is released. This level of restriction is what distinguishes it from other lock types, as it ensures that data remains unchanged and is safe from concurrent access issues during crucial operations.