Support Forums: Message List - Prevayler 2.0 Released: Prevalent Persistence Engine http://www.theserverside.com Most recent forum messages en Jive Forums Silver 5.5.30 (www.jivesoftware.com) Sun, 26 May 2013 05:30:18 -0400 not no-queries http://www.theserverside.com/discussions/thread.tss?thread_id=27931 Iterating all the elements in memory to search for name.equals("bob") is not going scale for enterprise apps.
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Why would you want to iterate? Why not just use a HashMap? That's essentially what an...]]> Thu, 30 Sep 2004 21:57:38 -0400 Thu, 30 Sep 2004 21:57:38 -0400 Thu, 30 Sep 2004 21:57:38 -0400 Sep 30, 2004 Stephen Kestle 0 you pay only when it fails http://www.theserverside.com/discussions/thread.tss?thread_id=27931 restore from the persistent storeif (execute action on king fails)  king = null; So you don't have to execute an action twice, and you don't use as much memory,The thing is queries run in parallel with transaction...]]> Mon, 16 Aug 2004 14:04:06 -0400 Mon, 16 Aug 2004 14:04:06 -0400 Mon, 16 Aug 2004 14:04:06 -0400 Aug 16, 2004 Klaus Wuestefeld 0 Instantaneous Transactions http://www.theserverside.com/discussions/thread.tss?thread_id=27931 but you execute twice the successfull transactions. ... And that's the price to pay when you want Prevayler to do the rollback for you.See Mon, 16 Aug 2004 13:33:47 -0400 Mon, 16 Aug 2004 13:33:47 -0400 Mon, 16 Aug 2004 13:33:47 -0400 Aug 16, 2004 Klaus Wuestefeld 0 ...but you execute twice the successfull transactions http://www.theserverside.com/discussions/thread.tss?thread_id=27931
yeah, transactions are executed twice. btut the execution of the transaction is not an expensive opration.
How do you know? I mean, as I understood it, I can put as much business code as I like inside a transaction, so...]]> Fri, 13 Aug 2004 08:45:33 -0400 Fri, 13 Aug 2004 08:45:33 -0400 Fri, 13 Aug 2004 08:45:33 -0400 Aug 13, 2004 Christoph Sturm 0 confusing runtime/development time? http://www.theserverside.com/discussions/thread.tss?thread_id=27931 Thu, 12 Aug 2004 00:43:25 -0400 Thu, 12 Aug 2004 00:43:25 -0400 Thu, 12 Aug 2004 00:43:25 -0400 Aug 12, 2004 Juozas Baliuka 0 confusing runtime/development time? http://www.theserverside.com/discussions/thread.tss?thread_id=27931 Databases have the same log files for recovery and use memory cache for performance. As I understand databases are implemented for reason and do not have any problems, is it some reason to replace database with log file and memory storage...]]> Wed, 11 Aug 2004 23:02:12 -0400 Wed, 11 Aug 2004 23:02:12 -0400 Wed, 11 Aug 2004 23:02:12 -0400 Aug 11, 2004 Cameron Purdy 1 ...but you execute twice the successfull transactions http://www.theserverside.com/discussions/thread.tss?thread_id=27931 yeah, transactions are executed twice. btut the execution of the transaction is not an expensive opration.How do you know? I mean, as I understood it, I can put as much business code as I like inside a transaction, so it might be...]]> Wed, 11 Aug 2004 08:11:27 -0400 Wed, 11 Aug 2004 08:11:27 -0400 Wed, 11 Aug 2004 08:11:27 -0400 Aug 11, 2004 Lars Stitz 1 ...but you execute twice the successfull transactions http://www.theserverside.com/discussions/thread.tss?thread_id=27931 yeah, transactions are executed twice. but the execution of the transaction is not an expensive opration. serializing it is expensive and happens only once.Good point. Thanks for the experience from the field.]]> Wed, 11 Aug 2004 07:50:26 -0400 Wed, 11 Aug 2004 07:50:26 -0400 Wed, 11 Aug 2004 07:50:26 -0400 Aug 11, 2004 Arnaud Cl?re 0 confusing runtime/development time? http://www.theserverside.com/discussions/thread.tss?thread_id=27931 Wed, 11 Aug 2004 01:16:50 -0400 Wed, 11 Aug 2004 01:16:50 -0400 Wed, 11 Aug 2004 01:16:50 -0400 Aug 11, 2004 Juozas Baliuka 2 you pay only when it fails http://www.theserverside.com/discussions/thread.tss?thread_id=27931 hey tom!it works like this:prevayler makes the copy of the system only before the first transaction and after a failing transaction.
pseudocode:
if (foodtaster == null)
 foodtaster = copyKing();
if (execute action on...]]> Tue, 10 Aug 2004 18:55:22 -0400 Tue, 10 Aug 2004 18:55:22 -0400 Tue, 10 Aug 2004 18:55:22 -0400 Aug 10, 2004 Tom Davies 1 confusing runtime/development time? http://www.theserverside.com/discussions/thread.tss?thread_id=27931 the loading of the database happens at runtime.while creating / implementing the application (development time) only little amounts of data are needed for testing (with the exception of testing the behaviour under load) and so only little...]]> Tue, 10 Aug 2004 13:57:10 -0400 Tue, 10 Aug 2004 13:57:10 -0400 Tue, 10 Aug 2004 13:57:10 -0400 Aug 10, 2004 Rickard Oberg 3 no queries http://www.theserverside.com/discussions/thread.tss?thread_id=27931 Tue, 10 Aug 2004 11:43:05 -0400 Tue, 10 Aug 2004 11:43:05 -0400 Tue, 10 Aug 2004 11:43:05 -0400 Aug 10, 2004 nextdb 1 confusing runtime/development time? http://www.theserverside.com/discussions/thread.tss?thread_id=27931 while creating / implementing the application (development time) only little amounts of data are needed for testing (with the exception of testing the behaviour under load) and so only little data has to...]]> Tue, 10 Aug 2004 11:31:05 -0400 Tue, 10 Aug 2004 11:31:05 -0400 Tue, 10 Aug 2004 11:31:05 -0400 Aug 10, 2004 martin schissler 4 Prevayler 2.0 Released: Prevalent Persistence Engine http://www.theserverside.com/discussions/thread.tss?thread_id=27931  Simpler and faster development time.If the database has to be loaded at startup, won't it take quite some time with a reasonably large database? I mean, the startup will take...]]> Tue, 10 Aug 2004 10:06:46 -0400 Tue, 10 Aug 2004 10:06:46 -0400 Tue, 10 Aug 2004 10:06:46 -0400 Aug 10, 2004 Rickard Oberg 5 ...but you execute twice the successfull transactions http://www.theserverside.com/discussions/thread.tss?thread_id=27931 Tue, 10 Aug 2004 08:28:35 -0400 Tue, 10 Aug 2004 08:28:35 -0400 Tue, 10 Aug 2004 08:28:35 -0400 Aug 10, 2004 Christoph Sturm 3