Abstract
NoSQL databases are capable of storing and processing big data which is characterized by various properties such as volume, variety and velocity. Such databases are used in a variety of user applications that need large volume of data which is highly available and efficiently accessible. But they do not enforce or require strong data consistency nor do they support transactions. This paper investigates into the transaction processing in consistency-aware applications hosted on MongoDB and Riak which are two representatives of Document and Key-Value NoSQL databases, respectively. It develops new transaction schemes in order to provide NoSQL databases with transactional facilities as well as to analyze the effects of transactions on data consistency and efficiency in user’s applications. The proposed schemes are evaluated using the YCSB + T benchmark which is based on Yahoo! Cloud Services Benchmark (YCSB). Experimental results show that using the proposed schemes, strong consistency can be achieved in MongoDB and Riak without severely affecting their efficiency. We also conduct experiments in order to analyse the level of consistencyof MongoDB and Riak transactional systems.
Highlights
Data storage and processing needs of modern Internet services such as social networks, online shopping, data analytics and visualization have necessitated new kind of storage systems, called NoSQL (Not Only SQL) databases
As described above, the different NoSQL databases assign different values to the parameters, N, W and R in order to adjust the level of consistency with respect to the efficiency of read and write operations [6]
In order to minimise the impact of such a loss, this paper addressed the issue of transactions and data consistency in NoSQL databases in general and MongoDB and Riak in particular
Summary
Data storage and processing needs of modern Internet services such as social networks, online shopping, data analytics and visualization have necessitated new kind of storage systems, called NoSQL (Not Only SQL) databases. It develops new systems in order to implement transactions in two different NoSQL databases, MongoDB and Riak, which are widely used in the industry. Note that in the current NoSQL databases, strong consistency (with N = W) is ensured when data is manipulated by a single CRUD operation, e.g., OPiw[DE].
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