Abstract Introduction While nightmares are well known to be associated with greater sleep disturbance and psychopathology relative insomnia, this has primarily been observed in experimental samples not well-studied outpatient clinical samples. Several theories for the etiology maintenance of have identified roles both hyperarousal emotion dysregulation explaining association adverse psychiatric...

Objectives. To examine the effect of immediate dentin sealing (IDS), with dentin bonding agents (DBAs) applied to freshly cut dentin, on the shear bond strength of etched pressed ceramic luted to dentin with RelyX Unicem (RXU) cement. Method. Eighty extracted noncarious third molars were ground flat to expose the occlusal dentin surfaces. The teeth were randomly allocated to five groups (A to E...

Since their earliest days, databases have held themselves to a strict invariant: Never give the user a wrong answer. So ingrained into psyche of database theoreticians, researchers, and DBAs is this invariant, that those few attempts to violate it have included cumbersome data models [3,7,8], huge warning signs [4], or obnoxious language constructs that break classical SQL [1,5]. Sadly, by focu...

Triggers have been adopted as an important database feature and implemented by most major database vendors. Despite their diverse potential usages, one of the obstacles that hinder the triggers from its wide deployment is the lack of tools that aid users to create complex trigger rules in a simple manner. Although the majority of the users of triggers are DBAs or savvy end-users, writing trigge...

Unsere Arbeitsgruppe entwickelt, experimentiert mit und evaluiert neue Lehrund Lernformen. Eine solche neuere Entwicklung ist das virtuelle Datenbankpraktikum, das nach mehreren Testläufen inzwischen fest im Curriculum verankert ist. Eine Weiterentwicklung ist das virtuelle Datenbankpraktikum mit Schwerpunkt Datenbankadministration. Ein solches Praktikum stellt hohe Anforderungen sowohl an die ...

Index structures are one of the most important tools that DBAs leverage in order to improve the performance of analytics and transactional workloads. However, with the explosion of data that is constantly being generated in a wide variety of domains including autonomous vehicles, Internet of Œings (IoT) devices, and E-commerce sites, building several indexes can o‰en become prohibitive and cons...

polymerization contraction may produce defects in the composite - tooth bond. this may lead to bond failure and microleakage. the aim of this study was to reduce microleakage of posterior composites using different methods. 45 molar and premolars extracted teeth were choosen. the cavities were randomly assigned into 5 groups of 9. box-shaped cavities were prepared on each side of proximal surfa...

We propose a solution to the automatic and online reindex problem. The proposed mechanism runs continuously and with almost no human intervention. The adopted strategy is based on ad-hoc heuristics that monitor the index fragmentation level and, when necessary, reindex it automatically. We have actually implemented our ideas within the PostgreSQL DBMS code. Practical performance tests show the ...