Support Forums: Message List - db4objects announces open source replication system http://www.theserverside.com Most recent forum messages en Jive Forums Silver 5.5.30 (www.jivesoftware.com) Mon, 20 May 2013 01:28:06 -0400 db4o transactions and isolation level http://www.theserverside.com/discussions/thread.tss?thread_id=38794
The new replication system is an external client to db4o and behaves like any other client.
In other words it does not support transactions
No. In other words it works with a single read...]]> Fri, 03 Feb 2006 08:35:30 -0500 Fri, 03 Feb 2006 08:35:30 -0500 Fri, 03 Feb 2006 08:35:30 -0500 Feb 3, 2006 Guglielmo Lichtner 0 db4objects announces open source replication system http://www.theserverside.com/discussions/thread.tss?thread_id=38794 We are using a different approach here. The basic idea is implementing a custom marker interface (eg. ReplicatedEntity) and adding timestamp-based versioning to all root-level hibernate entities needed to get replicated. Then a polymorphic...]]> Fri, 03 Feb 2006 05:36:20 -0500 Fri, 03 Feb 2006 05:36:20 -0500 Fri, 03 Feb 2006 05:36:20 -0500 Feb 3, 2006 Dennis Bekkering 0 db4objects announces open source replication system http://www.theserverside.com/discussions/thread.tss?thread_id=38794
Instead of using a timestamp-version number we use a simple counter. In order to be able to identify which changes occured since the last time two databases were syncronized, we store...]]> Fri, 03 Feb 2006 05:27:57 -0500 Fri, 03 Feb 2006 05:27:57 -0500 Fri, 03 Feb 2006 05:27:57 -0500 Feb 3, 2006 Carl Rosenberger 0 db4o transactions and isolation level http://www.theserverside.com/discussions/thread.tss?thread_id=38794
The new replication system is an external client to db4o and behaves like any other client.
In other words it does not support transactionsNo. In other words it works with a single read committed...]]> Fri, 03 Feb 2006 05:07:40 -0500 Fri, 03 Feb 2006 05:07:40 -0500 Fri, 03 Feb 2006 05:07:40 -0500 Feb 3, 2006 Carl Rosenberger 1 db4objects announces open source replication system http://www.theserverside.com/discussions/thread.tss?thread_id=38794 Fri, 03 Feb 2006 04:17:23 -0500 Fri, 03 Feb 2006 04:17:23 -0500 Fri, 03 Feb 2006 04:17:23 -0500 Feb 3, 2006 Kristof Jozsa 2 db4objects announces open source replication system http://www.theserverside.com/discussions/thread.tss?thread_id=38794
I am not sure what this can do for me. I'v been trying to build a system with wich people can work on local servers. Those local servers synq themselves with the main server. When the main server is down the local servers can keep...]]> Thu, 02 Feb 2006 19:28:05 -0500 Thu, 02 Feb 2006 19:28:05 -0500 Thu, 02 Feb 2006 19:28:05 -0500 Feb 2, 2006 Dennis Bekkering 3 db4objects announces open source replication system http://www.theserverside.com/discussions/thread.tss?thread_id=38794 I am not sure what this can do for me. I'v been trying to build a system with wich people can work on local servers. Those local servers synq themselves with the main server. When the main server is down the local servers can keep doing their...]]> Thu, 02 Feb 2006 18:39:10 -0500 Thu, 02 Feb 2006 18:39:10 -0500 Thu, 02 Feb 2006 18:39:10 -0500 Feb 2, 2006 Kristof Jozsa 4 Using db4o as a local cache / local backup server http://www.theserverside.com/discussions/thread.tss?thread_id=38794 How about talking to us directly?
just did ;-)]]> Thu, 02 Feb 2006 18:16:44 -0500 Thu, 02 Feb 2006 18:16:44 -0500 Thu, 02 Feb 2006 18:16:44 -0500 Feb 2, 2006 Dennis Bekkering 0 db4o transactions and isolation level http://www.theserverside.com/discussions/thread.tss?thread_id=38794 And does using the new replication system affect concurrency control and the isolation level?The new replication system is an external client to db4o and behaves like any other client.
In other words it does not...]]> Thu, 02 Feb 2006 16:38:30 -0500 Thu, 02 Feb 2006 16:38:30 -0500 Thu, 02 Feb 2006 16:38:30 -0500 Feb 2, 2006 Guglielmo Lichtner 2 Why not use Sequoia? http://www.theserverside.com/discussions/thread.tss?thread_id=38794 As opposed to what?
Whoops. Sorry. I thought it was the other thread ;-)

Guglielmo

Enjoy the Fastest Known Reliable Multicast Protocol with Total...]]> Thu, 02 Feb 2006 16:37:09 -0500 Thu, 02 Feb 2006 16:37:09 -0500 Thu, 02 Feb 2006 16:37:09 -0500 Feb 2, 2006 Guglielmo Lichtner 0 Why not use Sequoia? http://www.theserverside.com/discussions/thread.tss?thread_id=38794 Thu, 02 Feb 2006 16:35:45 -0500 Thu, 02 Feb 2006 16:35:45 -0500 Thu, 02 Feb 2006 16:35:45 -0500 Feb 2, 2006 Guglielmo Lichtner 1 Using db4o as a local cache / local backup server http://www.theserverside.com/discussions/thread.tss?thread_id=38794 My current customer propbably needs it in the near future and I am not that crazy that I am going to build it myself, it is actually the one thing that scares me. Could you indicate what it would cost to have it set up.How about...]]> Thu, 02 Feb 2006 16:30:05 -0500 Thu, 02 Feb 2006 16:30:05 -0500 Thu, 02 Feb 2006 16:30:05 -0500 Feb 2, 2006 Carl Rosenberger 1 Using db4o as a local cache / local backup server http://www.theserverside.com/discussions/thread.tss?thread_id=38794 neer futurenear future that is ;-)]]> Thu, 02 Feb 2006 16:01:46 -0500 Thu, 02 Feb 2006 16:01:46 -0500 Thu, 02 Feb 2006 16:01:46 -0500 Feb 2, 2006 Dennis Bekkering 0 Using db4o as a local cache / local backup server http://www.theserverside.com/discussions/thread.tss?thread_id=38794
I am not sure what this can do for me. I'v been trying to build a system with wich people can work on local servers. Those local servers synq themselves with the main server. When the main server is down the local servers can keep...]]> Thu, 02 Feb 2006 15:59:08 -0500 Thu, 02 Feb 2006 15:59:08 -0500 Thu, 02 Feb 2006 15:59:08 -0500 Feb 2, 2006 Dennis Bekkering 3 db4o transactions and isolation level http://www.theserverside.com/discussions/thread.tss?thread_id=38794 Does db4o support transactions?
Yes.
Can you point me to an example of how you demarcate transactions in db4o?
Work against db4o is always transactional. #commit() and #rollback() start new transactions...]]> Thu, 02 Feb 2006 15:47:01 -0500 Thu, 02 Feb 2006 15:47:01 -0500 Thu, 02 Feb 2006 15:47:01 -0500 Feb 2, 2006 Carl Rosenberger 3