Defining data placement and allocation in the disk subsystem can have a significant impact on data warehouse performance. However, our experiences with data warehouse implementations show that the database storage layout is often subject to vague or even invalid assumptions about I/O performance trade-offs. Clear guidelines for the assignment of database objects to disks are a very common reque...

Database administration (tuning) is the process of adjusting database configurations in order to accomplish desirable performance goals. This job is performed by human operators called database administrators (DBAs) who are generally well-paid, and are becoming more and more expensive with the increasing complexity and scale of modern databases. There has been considerable effort dedicated to r...

This paper addresses the problem of the unsuitability of most relational databases to express data annotations by defining data annotation models that allow users to annotate relational data at five levels database, relation, column, tuple, and cell. These models are structured using Extensible Markup Language (XML). The most important feature of these models is that they do not require any str...

In recent years, Database Management Systems (DBMS) have increased significantly in size and complexity, increasing the extent to which database administration is a time-consuming and expensive task. Database Administrator (DBA) expenses have become a significant part of the total cost of ownership. This results in the need to develop Autonomous Database Management systems (ADBMS) that would ma...

Modern DBMSes are designed to support many transactions running simultaneously. DBMS thrashing is indicated by the existence of a sharp drop in transaction throughput. Thrashing behavior in DBMSes is a serious concern to database administrators (DBAs) as well as to DBMS implementers. From an engineering perspective, therefore, it is of critical importance to understand the causal factors of DBM...

Objective. Determination of the effect of dentin bonding agent (DBA) on the prevention of tooth discoloration produced by mineral trioxide aggregate (MTA). Methods. 50 teeth were endodontically treated and after removal of 3 mm of obturating materials were divided into five groups. In white MTA (WMTA) and grey MTA (GMTA) groups, these materials were placed in root canal below the orifice. In DB...

Database auditing has become a very crucial aspect of security as organisations increase their adoption of database management systems (DBMS) as major asset that keeps, maintain and monitor sensitive information. Database auditing is the group of activities involved in observing a set of stored data in order to be aware of the actions of users. The work presented here outlines the main auditing...

This study aims to determine the levels of methylene blue active substances (MBAS) and ethyl violet active substances (EVAS) as anionic surfactants and of disulphine blue active substances (DBAS) as cationic surfactants in the surface microlayer (SML) around an estuarine area using colorimetric methods. The results show that the concentrations of surfactants around the estuarine area were domin...

Fast growing volumes of data, typically for today’s database applications, require efficient and low-cost management to guarantee reliable processing and high throughputs. Although administrative costs for skilled DBAs are noticeable, it is often done manually due to the lack of available online tuning utilities. Typical operating goals for a database system comprise throughput, resource utiliz...

The access network infrastructure plays an important role in the overall performance of the network, next generation access networks (NGA) must be able to access diverse services, and should incorporate adequate architectures that include mechanisms for the integration of different technologies. New optical access technologies trends are: WDM, 10 Gb/s, and longer reach/higher splits. It is also...