Why do we need concurrency control on B+ trees ?

Related MCQs

• How many techniques are available to control concurrency on B+ trees?
• In concurrency control policy the lock is obtained on
• A concurrency-control policy such as this one leads to              performance since it forces transactions to wait for preceding transactions to finish before they can start.
• Instead of locking index leaf nodes in a two-phase manner, some index concurrency- control schemes use                        on individual key values, allowing other key values to be inserted or deleted from the same leaf.
• Concurrency control is important for which of the following reasons?
• If the attribute phone number is included in the relation all the values need not be entered into the phone number column. This type of entry is given as
• Each array declaration need not give, implicitly or explicitly, the information about
• For a transaction to be durable, its changes need to be written to                  storage.
• To access information from a database, you need a ___________
• Which category of users need not be aware of the presence of the database system?