One of the main activities of a Database Administrator (DBA) is to maintain an appropriate index configuration. However, adjustments in index configuration have become a very complex decision problem for DBAs. Making decisions concerning index maintenance often strains human cognitive capabilities. The DBA is faced with an intractable amount of factors that can impact the result of his/her deci...

In today’s world, databases and database systems have become an essential component of everyday life, so much so that a life without DBMSs has become inconceivable. This article focuses on relational database management systems in particular, and proposes a novel and innovative multi-agent system that would autonomously and rationally administer and maintain databases. The proposed multi-agent ...

When deploying database-centric web applications, administrators should pay special attention to database security requirements. Acknowledging this, Database Management Systems (DBMS) implement several security mechanisms that help Database Administrators (DBAs) making their installations secure. However, different software products offer different sets of mechanisms, making the task of selecti...

In the last two decades, both researchers and vendors have built advisory tools to assist database administrators (DBAs) in various aspects of system tuning and physical design. Most of this previous work, however, is incomplete because they still require humans to make the final decisions about any changes to the database and are reactionary measures that fix problems after they occur. What is...

As storage systems become increasingly heterogeneous and complex, it adds burdens on DBAs, causing suboptimal performance even after a lot of human efforts have been made. In addition, existing monitoring-based storage management by access pattern detections has difficulties to handle workloads that are highly dynamic and concurrent. To achieve high performance by best utilizing heterogeneous s...

Queries that scan a B-Tree index can suffer significant I/O performance degradation due to index fragmentation. The task of determining if an index should be defragmented is challenging for database administrators (DBAs) since today’s database engines offer no support for quantifying the impact of defragmenting an index on query I/O performance. Furthermore, DBMSs only support defragmentation a...

We compared day time functioning in college students with and without insomnia and explored changes in day time functioning after progressive relaxation (PR) treatment for insomnia. Students with insomnia (SWI; n = 57) were compared to a control group of students not complaining of insomnia (SNI; n = 61) on self-reported sleep variables and five questionnaires: Insomnia Impact Scale (IIS), Dysf...

BACKGROUND Regardless of the technique and the material used, the goal of obturation remained the same that is to seal every portal of exit in the root canal system. It's not only the apical openings that need to be sealed but also lateral openings, coronal access opening and perforations if they exist failure of the adhesive root canal sealer has led to the idea of usage of dentin bonding agen...

Classically, the control of the risk associated to the operation of a nuclear power plant has been founded on the definition of a group of events representing credible worst-case accident scenarios (the so-called Design Basis Accidents, DBAs) and on the prediction and analysis of their consequences by deterministic calculations. Then, the safety and protection of the system is designed against ...

The complexity of today’s computer systems poses a challenge to system administrators. Current systems comprise a multitude of inter-related software components running on many servers. To make matters worse, as computers permeate all aspects of our lives, higher demands are placed on the availability and correct operation of the services provided by the computer systems. Unfortunately, few cur...