Re: [Exist-open] Survey on XML Databases

[Adam R. <ad...@ex...>]

> I have two more questions, sorry.
>>
>> System controlled transactions with rollback.
>
> Is that the Two-Phase Commit Protocol?

No.

> I guess the locking is preventing the data from anomalies.
> So when do you need a rollback?

Whenever an operation within a transaction fails, the entire
transaction is rolled back. Standard database stuff!

> Adam Retter schrieb:
>>
>> Journalling is a filesystem technique that is also used in database
>> systems to prevent data loss and ensure consistency during critical
>> situations such as unexpected power loss.
>>
>> On 22 July 2010 09:20, Andreas Weiler <and...@un...>
>> wrote:
>>
>>>>
>>>> Data journalling is also provided.
>>>>
>>>
>>> What's that supposed to mean?
>>>
>>> Thx
>>>
>>> gjb schrieb:
>>>
>>>>
>>>> On 20/07/2010 21:55, Andreas Weiler wrote:
>>>>
>>>>>
>>>>> ok so you have to connect with httpsockets?
>>>>>
>>>>
>>>> No I am instead using a browser UI that talks HTTP verbs to eXist in a
>>>> RESTful way
>>>> - I don't use the httpclient
>>>> http://demo.exist-db.org/exist/functions/httpclient
>>>> approach because in transit any PUT DELETE are liable
>>>> to get blocked by firewalls.
>>>> Plus IMHO it's best to avoid too much server side xQuery  so
>>>> I use the jQuery $.ajax methods that allow the browser to think it's
>>>> using PUT and DELETE while behind the scenes it actually implments
>>>> everything by POST. This is all still browser/client-side.
>>>>
>>>> Is your httpsocket approach browser based?
>>>>
>>>>
>>>>
>>>>>
>>>>> gjb schrieb:
>>>>>
>>>>>>
>>>>>> On 20/07/2010 20:57, Andreas Weiler wrote:
>>>>>>
>>>>>>>
>>>>>>> And after connecting to the server with a socket i talk to it with
>>>>>>> XML-RPC, WebDAV or REST-style HTTP interfaces, right?
>>>>>>>
>>>>>>
>>>>>> well the http interface is usually connected not by low-level sockets
>>>>>> but by a browser or OS connecting to an URL. If you have sockets to
>>>>>> connect make them talk to eXist server via an URL.
>>>>>>
>>>
>>>
>>> ------------------------------------------------------------------------------
>>> This SF.net email is sponsored by Sprint
>>> What will you do first with EVO, the first 4G phone?
>>> Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first
>>> _______________________________________________
>>> Exist-open mailing list
>>> Exi...@li...
>>> https://lists.sourceforge.net/lists/listinfo/exist-open
>>>
>>>
>>
>>
>>
>>
>
>



-- 
Adam Retter

eXist Developer
{ United Kingdom }
ad...@ex...
irc://irc.freenode.net/existdb