Databases in the Cloud—What is different? Summary The HyPer prototype demonstrates that it is indeed possible to build a main-memory database system that achieves world-record transaction processing throughput and best-of-breed OLAP query response times in one system in parallel on the same database state. Currently, users with high rates of mission-critical transactions have split their data into two separate systems, one database for OLTP and one so-called data warehouse for OLAP.
Introduction Welcome to the official Infinispan user guide. This comprehensive document will guide you through every last detail of Infinispan. Because of this, it can be a poor starting point if you are new to Infinispan.
For newbies, starting with the Getting Started Guide or one of the Quickstarts is probably a better bet. The Frequently Asked Questions and Glossary are also useful documents to have alongside this user guide.
As a local cache The primary use for Infinispan is to provide a fast in-memory cache of frequently accessed data. Suppose you have a slow data source database, web service, text file, etc: Using Infinispan is better than using a simple ConcurrentHashMap, since it has additional useful features such as expiration and eviction.
As a clustering building block for your applications If you need to make your application cluster-aware, integrate Infinispan and get access to features like topology change notifications, cluster communication and clustered execution.
As a geographical backup for your data Infinispan supports replication between clusters, allowing you to backup your data across geographically remote sites. While they share some methods and properties, be aware that there are semantic differences between them. The following chapters focus mostly on the embedded implementation.
For details on the remote implementation refer to Hot Rod Java Client. CacheManagers are heavyweight objects, and we foresee no more than one CacheManager being used per JVM unless specific setups require more than one; but either way, this would be a minimal and finite number of instances.
The simplest way to create a CacheManager is: CacheManagers have a lifecycle and the default constructors also call start. Overloaded versions of the constructors are available, that do not start the CacheManager, although keep in mind that CacheManagers need to be started before they can be used to create Cache instances.
Once constructed, CacheManagers should be made available to any component that require to interact with it via some form of application-wide scope such as JNDI, a ServletContext or via some other mechanism such as an IoC container.
When you are done with a CacheManager, you must stop it so that it can release its resources: If the CacheManager was clustered it will also leave the cluster gracefully. Configuration Infinispan offers both declarative and programmatic configuration. Configuring caches declaratively Declarative configuration comes in a form of XML document that adheres to a provided Infinispan configuration XML schema.
Every aspect of Infinispan that can be configured declaratively can also be configured programmatically. In fact, declarative configuration, behind the scenes, invokes the programmatic configuration API as the XML configuration file is being processed.
One can even use a combination of these approaches. For example, you can read static XML configuration files and at runtime programmatically tune that same configuration. Or you can use a certain static configuration defined in XML as a starting point or template for defining additional configurations in runtime.
There are two main configuration abstractions in Infinispan: Global configuration Global configuration defines global settings shared among all cache instances created by a single EmbeddedCacheManager.
Cache configuration Cache configuration is specific to the actual caching domain itself: You can specify as many named cache configurations as you need.Abstract—The design of Automatic Generation Control (AGC) system plays a vital role in automation of power system. This paper proposes Hybrid Neuro Fuzzy (HNF) approach for AGC of two-area interconnected reheat .
Woodward provides unsurpassed control and protection system solutions for every type of power generation and distribution application, from the simplest to the most complex. Before the use of automatic generation control, one generating unit in a system would be designated as the regulating unit and would be manually adjusted to control the balance between generation and load to maintain system frequency at the desired value.
Gain the benefits of flash storage for minimal acquisition costs. E Hybrid Storage Systems optimize mixed-workload performance using all flash or hybrid storage. area.
Within each control area the mechanical power input to the synchronous generators is automatically regulated by au-tomatic generation control (AGC). AGC uses the local control signals, deviations in frequency and net power interchanges between the neighboring areas, to invoke appropriate valve actions of generators in response to .
A distributed energy resource is not limited to the generation of electricity but may also include a device to store distributed energy (DE). Distributed energy storage systems (DESS) applications include several types of battery, pumped hydro, compressed air, and thermal energy storage.