Based on previous work that defines the semantics of read-only queries on an objectoriented database we present a set of proofs showing useful properties of queries. It is shown that certain equivalences exist between particular query forms and that general results can be shown about particular

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The era of column-oriented database systems has truly begun with open source database systems like C-Store, MonetDb, LucidDb and commercial ones like Vertica. Column-oriented database stores data column-by-column which means it stores information of single attribute collectively. The need for Column-oriented database arose from the need of business intelligence for efficient decision making where traditional row-oriented database gives poor performance. PostgreSql is an open source row-oriented and most widely used relational database management system which does not have facility for storing data in column-oriented fashion. In our work we propose the best method for implementing column-store on top of rowstore in PostgreSql along with successful design and implementation of the same.

A read-only transaction or query is a transaction which does not modify any data. Read-only transactions could be processed with general transaction processing algorithms, but in many cases it is more efficient to process read-only transactions with special algorithms which take advantage

Abstract — R-DHT is a class of DHT whereby each node supports “read-only ” accesses to its key-value pairs, but does not allow key-value pairs belonging to other nodes to be written on it. Recently, supporting efficient multi-attribute range queries on DHT has been an active area of research

are combined with caching to improve query latency. The relative advantages of each method are demonstrated through both simulation results and qualitative arguments. Read-only transactions are processed locally at the client without contacting the server and thus the proposed approaches are scalable, i

present a DHT-based resource discovery scheme without distributing data items called R-DHT (Read-only DHT). We further extend R-DHT to support multi-attribute queries with our Midas scheme (Multi-dimensional range queries). R-DHT is a new DHT

Inverted files are frequently used as index data structures for very large text databases. Most applications of this data structure are for read-only query operations. However, the problem of introducing update operations has deserved little attention so far and yet it has important applications

In this paper, we address the issue of ensuring consistency of multiple data items requested in a certain order by read-only transactions in wireless data broadcast. To handle the inherent property in a data broadcast environment that data can only be accessed strictly sequential by users, we

, and allows read-only queries to be performed locally within a site for the price of additional hardware. A prototype implementation is evaluated over several network topologies and is compared with a flat Byzantine tolerant approach. I.