1 Department of Computer Science and Engineering Ajay Kumar Garg Engineering College Ghaziabad(U.P) INDIA 2 Faculty of Computer Science and Engineering Jaypee Institute of Information Technology Gautam Budh Nagar, Noida(U.P) INDIA _________________________________________________________________________________________ Abstract: Geographical information system and information retrieval has been...

The performance of a database management system (DBMS) is fundamentally dependent on the access methods and query processing techniques available to the system. Traditionally, relational DBMSs have relied on well-known access methods, such as the ubiquitous B-tree, hashing with chaining, and, in some cases, linear hashing [52]. Object-oriented and object-relational systems have also adopted the...

Multiversion access methods have been emerged in the literature primarily to support queries on a transaction-time database where records are never physically deleted. For a popular class of efficient methods (including the multiversion Btree), data records and index entries are occasionally duplicated to separate data according to time. In this paper, we present techniques for improving query ...

The main contribution of this paper is a bulk-loading algorithm for multi-way dynamic metric access methods based on the covering radius of a representative, like the Slim-tree. The proposed algorithm is sample-based, and it builds a height-balanced tree in a top-down fashion, using the metric domain’s distance function and a bound limit to group and determine the number of elements in each par...

This article describes a rule-set approach to formal modeling of a trusted computer system. A finite state machine models the access operations of the trusted system while a separate rule set expresses the system's trust policies. A powerful feature of this approach is its ability to fit several widely differing trust policies easily within the same model. The paper shows how this approach to m...

Security-sensitive business processes are business processes that must comply with security requirements (e.g. authorization constraints). In previous works it has been shown that model checking can be profitably used for the automatic analysis of security-sensitive business processes. But building a formal model that simultaneously accounts for both the workflow and the access control policy i...

We propose an access control model specifically developed to support fine-grained response actions, such as request suspension and request tainting, in the context of an anomaly detection system for databases. To achieve such response semantics, the model introduces the concept of privilege states and orientation modes in the context of a role-based access control system. The central idea in ou...