Concurrency Control in DBMS is a very useful technique to maintain mutually exclusive transactions for database operations. It manages the requests and streamlines the operations where multiple systems or processes try accessing the same database resource. It helps in data integrity across systems and ...
Concurrency control is the technique that ensures that the the above three conflicts don’t occur in the database. There are certain rules to avoid problems in concurrently running transactions and these rules are defined as the concurrency control protocols. Concurrency control protocols Concurrency co...
This paper studies strict timestamp ordering (STO), a "good old" technique, in the context of modern main-memory database systems built on commodity hardware with high memory capacities. We show that its traditional main drawback – slowing down reads – has a much lower impact in a main-...
Pessimistic concurrency control (PCC, also called pessimistic locking) is widely adopted in handling concurrent database operations. It aims to prevent conflicts among concurrent transactions by acquiring locks on data items before use. This technique assumes that conflicts are likely to occu...
In a mobile computing environment, caching of frequently accessed data has been shown to be a useful technique for reducing contention on the narrow bandwidth of the wireless channels. However, the traditional client/server strategies for supporting transactional cache consistency that require extensive ...
Multiversion concurrency control (MVCC) is a database optimization technique. MVCC creates duplicate copies of records so that data can be safely read and updated at the same time. With MVCC, database reads and writes don’t block each other, and that greatly enh...
Data concurrency ensures the efficient utilization of resources and timely processing of transactions in database management systems (DBMS).
The design choices oflegacydisk-oriented DBMSs are inappropriate for in-memory DBMSs running on a machine with a large number of CPU cores. As such,this previous work does not reflect recent trends in latch-free[27] and serializable [20] concurrency control, as well as in-memory storage [...
(i.e., a cache) and performs operations on these copies of the columns, using the well-known technique of caching. Only at commit time does the transaction manager 128 update the copy of the columns in the database 124. Generally, when it is time for the transaction to commit, if a ...
This paper presents a dynamic granular locking approach to phantom protection in Generalized Search Trees (GiSTs), an index structure supporting an extensible set of queries and data types. The granular locking technique offers a high degree of concurrency and has a low lock overhead. Our ...