Effective DMBS space management on native Flash

In this paper we build on our research in data management on native Flash storage. In particular we demonstrate the advantages of intelligent data placement strategies. To effectively manage phsical Flash space and organize the data on it, we utilize novel storage structures such as regions and groups. These are coupled to common DBMS logical structures, thus require no extra overhead for the DBA. The experimental results indicate an improvement of up to 2x, which doubles the longevity of Flash SSD. During the demonstration the audience can experience the advantages of the proposed approach on real Flash hardware

Isolated Eigenvalues of the Ferromagnetic Spin-J XXZ Chain with Kink Boundary Conditions

We investigate the low-lying excited states of the spin J ferromagnetic XXZ chain with Ising anisotropy Delta and kink boundary conditions. Since the third component of the total magnetization, M, is conserved, it is meaningful to study the spectrum for each fixed value of M. We prove that for J>= 3/2 the lowest excited eigenvalues are separated by a gap from the rest of the spectrum, uniformly in the length of the chain. In the thermodynamic limit, this means that there are a positive number of excitations above the ground state and below the essential spectrum

Revisiting DBMS Space Management for Native Flash

ABSTRACT In this paper we present our work in progress on revisiting traditional DBMS mechanisms to manage space on native Flash and how it is administered by the DBA. Our observations and initial results show that: the standard logical database structures can be used for physical organization of data on native Flash; at the same time higher DBMS performance is achieved without incurring extra DBA overhead. Initial experimental evaluation indicates a 20% increase in transactional throughput under TPC-C, by performing intelligent data placement on Flash, less erase operations and thus better Flash longevity

Endogenous IL-33 Accelerates Metacestode Growth during Late-Stage Alveolar Echinococcosis.

During the course of the infectious disease alveolar echinococcosis (AE), the larval stage of Echinococcus multilocularis develops in the liver, where an initial Th1/Th17 immune response may allow its elimination in resistant individuals. In patients susceptible to infection and disease, the Th2 response initiates later, inducing tolerance to the parasite. The role of interleukin 33 (IL-33), an alarmin released during necrosis and known to drive a Th2 immune response, has not yet been described during AE. Wild-type (WT) and IL-33-/- C57BL/6J mice were infected by peritoneal inoculation with E. multilocularis metacestodes and euthanized 4 months later, and their immune response were analyzed. Immunofluorescence staining and IL-33 enzyme-linked immunosorbent assay (ELISA) were also performed on liver samples from human patients with AE. Overall, metacestode lesions were smaller in IL-33-/- mice than in WT mice. IL-33 was detected in periparasitic tissues, but not in mouse or human serum. In infected mice, endogenous IL-33 modified peritoneal macrophage polarization and cytokine profiles. Th2 cytokine concentrations were positively correlated with parasite mass in WT mice, but not in IL-33-/- mice. In human AE patients, IL-33 concentrations were higher in parasitic tissues than in distant liver parenchyma. The main sources of IL-33 were CD31+ endothelial cells of the neovasculature, present within lymphoid periparasitic infiltrates together with FOXP3+ Tregs. In the murine model, periparasitic IL-33 correlated with accelerated parasite growth putatively through the polarization of M2-like macrophages and release of immunosuppressive cytokines IL-10 and transforming growth factor β1 (TGF-β1). We concluded that IL-33 is a key alarmin in AE that contributes to the tolerogenic effect of systemic Th2 cytokines. IMPORTANCE Infection with the metacestode stage of Echinococcus multilocularis, known as alveolar echinococcosis, is the most severe cestodosis worldwide. However, less than 1% of exposed individuals, in which the immune system is unable to control the parasite, develop the disease. The factors responsible for this interindividual variability are not fully understood. In this in vivo study comparing wild-type and IL-33-/- infected mice, together with data from human clinical samples, we determined that IL-33, an alarmin released following tissue injury and involved in the pathogenesis of cancer and asthma, accelerates the progression of the disease by modulating the periparasitic microenvironment. This suggests that targeting IL-33 could be of interest for the management of patients with AE, and that IL-33 polymorphisms could be responsible for increased susceptibility to AE

Aspects of append-based database storage management on flash memories

New storage technologies, such as Flash and Non- Volatile Memories, with fundamentally different properties are appearing. Leveraging their performance and endurance requires a redesign of existing architecture and algorithms in modern high performance databases. Multi-Version Concurrency Control (MVCC) approaches in database systems, maintain multiple timestamped versions of a tuple. Once a transaction reads a tuple the database system tracks and returns the respective version eliminating lock-requests. Hence under MVCC reads are never blocked, which leverages well the excellent read performance (high throughput, low latency) of new storage technologies. Upon tuple updates, however, established implementations of MVCC approaches (such as Snapshot Isolation) lead to multiple random writes – caused by (i) creation of the new and (ii) in-place invalidation of the old version – thus generating suboptimal access patterns for the new storage media. The combination of an append based storage manager operating with tuple granularity and snapshot isolation addresses asymmetry and in-place updates. In this paper, we highlight novel aspects of log-based storage, in multi-version database systems on new storage media. We claim that multi-versioning and append-based storage can be used to effectively address asymmetry and endurance. We identify multi-versioning as the approach to address dataplacement in complex memory hierarchies. We focus on: version handling, (physical) version placement, compression and collocation of tuple versions on Flash storage and in complex memory hierarchies. We identify possible read- and cacherelated optimizations

Entwicklung einer storytelling-basierten Point-of-Service Anwendung in Flash

Die Bachelorarbeit befasst sich mit der Erstellung einer Storytelling basierenden Sportstudioanwendung. Die Storytelling basierten Elemente steuern die Anwendung und führen den Benutzer durch ein System, das ihm erlaubt einen Trainingsplan zu erstellen, Übungen anzusehen und somit einen virtuellen Rundgang durch das Sportstudio und dessen Trainingsmethodik zu unternehmen. KMF, die Kundenorientierte Medizinische Fitness, dient der Zusammenstellung eines neuen Trainingsplanes. Die durchzuführenden Übungen werden mit Flash Animationen dargestellt und über eine nicht lineare Steuereinheit mit narrativen Erzählstrukturen ausgewählt. Das System hilft dem Benutzer, sich über Trainingsvarianten und Trainingsarten des Sportstudios zu informieren. Dabei liegt der Fokus auf der Erklärung von speziellen Übungen, die auch im realen Fitnessstudio existieren. Zu den jeweiligen Übungen wird eine Flash - Animation dargestellt, welche die korrekte Ausführung, basierend auf der im Sportstudio gegebenen Umgebung, anzeigt. Durch die narrative Steuerung wird das System für den Benutzer durch die Interaktionsmöglichkeiten interessanter und vielfältiger. Es besteht mit einer Authoringumgebung die Möglichkeit, die narrative Steuerungseinheit um weitere Controller zu ergänzen. Der Benutzer erhält Informationen zur der Übung per Text und durch die Darstellung der Trainingsanimation. Der Kunde des Fitnessstudios kann somit eine Übung auch unverbindlich ansehen, ohne dafür auf die Betreuung durch einen Trainer angewiesen zu sein. Die Interesse der Kundschaft in Fitnesscentern, an fitnessorientierten Medien ist hoch und die Marktübersicht zeigt (siehe Kapitel 2 der Bachelorarbeit ), dass Bedarf besteht, für die Entwicklung einer solchen Anwendung

Impact of new storage technologies on an OLTP DBMS, its architecture and algorithms.

New developments in hardware storage technology introduce fundamentally different performance characteristics and device properties. Storage technologies such as Flash and Non Volatile Memories (NVMs) are asymmetric in terms of their read and write performance, they read much faster than they write. Modern DBMSs are not aware of the underlying asymmetric storage technologies. They are well-developed systems and in principle capable of working with asymmetric storage technologies as a mere replacement, yet they fail to exploit their key properties. Huge performance potential is lying idle and durability of the storage media is shortened which ultimately leads to higher costs. This work is a remedy for those shortcomings, making the DBMS aware of the underlying asymmetric Flash storage and questioning existing multi-version DBMS (MV-DBMS) architecture, algorithms and optimizations. We exploit the performance potential of the asymmetric Flash storage and increase its durability. A re-evaluation and redesign of components within the DBMS is necessary, inevitably leading to a redesign of the whole DBMS. Without such a redesign, the DBMS software stack will become the new I/O bottleneck. The combination of the MV-DBMS, multi-versioning concurrency control (MVCC) and append/log-based storage management (LbSM) on Flash storage delivers optimal performance figures which are needed to satisfy the urgent demand in scalable performance for modern DBMSs