persistent

I need a disk backed Map structure to use in a Java app. It must have the following criteria: Capable of storing millions of records (even billions) Fast lookup - the majority of operations on the Map will simply to see if a key already exists. This, and 1 above are the most important criteria. There should be an effective in memory caching mechanism for frequently used keys. Persistent, but does not need to be transactional, can live with some failure. i.e. happy to synch with disk periodically, and does not need to be transactional. Capable of storing simple primitive types - but I don't

I read about " HTTP persistent connection " but somehow I don't seem to understand what does persistent mean in this context. Could you'll elaborate? All the discussion till now has been from the browser side of things. The browser first request the actual page, and it parses the page and finds out all other resources that it needs before it can render that page. The browser requests these resources and other dependent resources one by one. So maintaining a persistent connection is very efficient here, as the overhead of creating and destroying connections is avoided. Now from web server side

Are all immutable data structures in Scala persistent? If not, which of them are and which not? What are the behavioural characteristics of those which are persistent? Also, how do they compare to the persistent data structures in Clojure? Scala's immutable data structures are all persistent, in the sense that the old value is maintained by an `update' operation. In fact, I do not know of a difference between immutable and persistent; for me the two terms are aliases. Two of Scala's 2.8 immutable data structures are vectors and hash tries, represented as 32-ary trees. These were originally

I'm getting this error when submitting the form: org.hibernate.PersistentObjectException: detached entity passed to persist: com.project.pmet.model.Account; nested exception is javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: com.project.pmet.model.Account Here are my entities: Account: @Entity @DynamicInsert @DynamicUpdate public class Account { @Id @GeneratedValue private Integer id; @Column(nullable = false) private String login; @Column(nullable = false) private String password; @Column(nullable = false) private String

I'm facing a huge problem developing an Android app which use a Webview to display datas. The website i'm using in the webview use localStorage API of HTML 5. To enable this feature i've set the webview setting like this : webview.getSettings().setDomStorageEnabled(true); webview.getSettings().setJavaScriptEnabled(true); So the localStorage API works but when I close the app (and kill the process), localStorage is completly erased and when I reload it, all my datas are lost. My question is simple : How to make DomStorage of a Webview persistant even when we close the app ? Thank you for all

I'm using django with apache and mod_wsgi and PostgreSQL (all on same host), and I need to handle a lot of simple dynamic page requests (hundreds per second). I faced with problem that the bottleneck is that a django don't have persistent database connection and reconnects on each requests (that takes near 5ms). While doing a benchmark I got that with persistent connection I can handle near 500 r/s while without I get only 50 r/s. Anyone have any advice? How to modify django to use persistent connection? Or speed up connection from python to DB Thanks in advance. Cesar Canassa Django 1.6 has