[fpc-pascal] How to save a huge XML?

[Marcos Douglas]

On Tue, Jun 18, 2013 at 11:01 AM, Michael Van Canneyt
<michael at freepascal.org> wrote:
>
>
> On Tue, 18 Jun 2013, Marcos Douglas wrote:
>
>> On Tue, Jun 18, 2013 at 10:44 AM, Michael Van Canneyt
>> <michael at freepascal.org> wrote:
>>>
>>>
>>>
>>> On Tue, 18 Jun 2013, Marcos Douglas wrote:
>>>
>>>>> No. The writer already uses a fixed buffer. Your problem is the use of
>>>>> TXMLDocument.
>>>>
>>>>
>>>>
>>>> Ideas? Maybe do what Antonio Fortuny said before?
>>>>
>>>>>
>>>>> Simply put: logging to XML (worse: using DOM) is a VERY bad idea.
>>>>
>>>>
>>>>
>>>> Well, this is a request of my client. Other process will read this XML.
>>>
>>>
>>>
>>> Under no circumstances should you use TXMLDocument for this.
>>
>>
>> So, where is recommended to use TXMLDocument class?
>
>
> General XML processing. Small documents.
>
> You should be aware that the DOM always has the whole XML document in
> memory, plus a substantial amount of overhead. This is not something FPC
> specific, but is inherent in the DOM model. (a W3 spec)
>
> Regardles of XML or not: keeping logs in memory is simply a bad idea. You
> can buffer them for performance reasons, but after some time you must write
> to file.
>
> The DOM model does not allow this.

Yes, I see now.
I'll change my app.

Marcos Douglas