Prevayler is an open-source (BSD) system-prevalence layer for Java: it transparently persists plain old Java objects. It is an in-RAM database backed by snapshots of the system via object serialization, which are loaded after a system crash to restore state. Changes to data happen via transaction operations on objects made from serializable classes. Prevayler's development was started by Klaus Wuestefeld. Read operations are three to four orders of magnitude faster with Prevayler when compared to traditional database systems since all objects are always in RAM and in-process.
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| - Prevayler (de)
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| - Prevayler é um software livre escrito predominantemente em Java. É usado para persistência de dados transparente, tolerante a falhas e possui uma arquitetura de balanceamento de carga para Plain Old Java Objects (POJOs). Quando comparado com um banco de dados tradicional, o processo de leitura de dados é cerca de três ou quatro ordens de magnitude mais rápido. Entretanto, por armazenar os dados em memória RAM, o volume total de dados fica limitado ao total de memória disponível. (pt)
- Prevayler ist ein freier, hauptsächlich in Java geschriebener Persistenz-Layer für Plain Old Java Objects (POJOs). Prevayler gilt als sehr schnell, fehlertolerant und bietet Load-Balancing. Von anderen Persistenz-Layern wie beispielsweise TopLink oder Hibernate unterscheidet sich Prevayler dadurch, dass die Objekte nicht in einer relationalen Datenbank gespeichert, sondern im Arbeitsspeicher gehalten werden. Es gibt lediglich in bestimmten Abständen einen Dump auf ein nicht flüchtiges Medium, wie zum Beispiel eine Festplatte. (de)
- Prevayler is an open-source (BSD) system-prevalence layer for Java: it transparently persists plain old Java objects. It is an in-RAM database backed by snapshots of the system via object serialization, which are loaded after a system crash to restore state. Changes to data happen via transaction operations on objects made from serializable classes. Prevayler's development was started by Klaus Wuestefeld. Read operations are three to four orders of magnitude faster with Prevayler when compared to traditional database systems since all objects are always in RAM and in-process. (en)
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| - Prevayler ist ein freier, hauptsächlich in Java geschriebener Persistenz-Layer für Plain Old Java Objects (POJOs). Prevayler gilt als sehr schnell, fehlertolerant und bietet Load-Balancing. Von anderen Persistenz-Layern wie beispielsweise TopLink oder Hibernate unterscheidet sich Prevayler dadurch, dass die Objekte nicht in einer relationalen Datenbank gespeichert, sondern im Arbeitsspeicher gehalten werden. Es gibt lediglich in bestimmten Abständen einen Dump auf ein nicht flüchtiges Medium, wie zum Beispiel eine Festplatte. Problematisch ist allerdings das permanente Halten aller Objekte im Arbeitsspeicher. Für manche Anwendung ist das ein K.O.-Kriterium, da die Datenmenge unter Umständen schnell größer wird als der Hauptspeicher verkraften kann. Prevayler unterstützt nicht das explizite Zurücksetzen der gespeicherten Daten. (de)
- Prevayler is an open-source (BSD) system-prevalence layer for Java: it transparently persists plain old Java objects. It is an in-RAM database backed by snapshots of the system via object serialization, which are loaded after a system crash to restore state. Changes to data happen via transaction operations on objects made from serializable classes. Prevayler's development was started by Klaus Wuestefeld. Read operations are three to four orders of magnitude faster with Prevayler when compared to traditional database systems since all objects are always in RAM and in-process. Prevayler requires enough RAM to keep the entire system state. (en)
- Prevayler é um software livre escrito predominantemente em Java. É usado para persistência de dados transparente, tolerante a falhas e possui uma arquitetura de balanceamento de carga para Plain Old Java Objects (POJOs). Quando comparado com um banco de dados tradicional, o processo de leitura de dados é cerca de três ou quatro ordens de magnitude mais rápido. Entretanto, por armazenar os dados em memória RAM, o volume total de dados fica limitado ao total de memória disponível. (pt)
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