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.
A. B+ tree locking
B. Link level locking
C. Key-value locking
D. Next value locking
Answer:A
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.
A. B+ tree locking B. Link level locking C. Key-value locking D. Next value locking
Explanation:Key-value locking thus provides increased concurrency.