Hi Martin (cc to the list),

> 1. each XML node => 500 bytes
> 2. total size of XML DB => 10million nodes(which will grow continuously as
> new files are added).

So one node is one document, right? I’m just asking because, in the
XML terminology, each XML document has nodes itself: element nodes,
attributes nodes, text nodes, etc.

If you are working with millions of documents, it can be helpful to
work with a "daily" database, which contains auxiliary references on
documents that have been deleted or updated. If there is a time
interval in which no people access your database (e.g. each night),
you can merge these databases and recreate your index structures. If
you query your database, you can a few more lines of XQuery: first
check your daily database, and (if it doesn’t contain the required
document) look up the document in your fully indexed database.

> I have to do a update of the nodes as I need to replace them. I chose delete
> + insert instead of replace

Please note that a replace operation can be much faster: If the
structure of the updated document is similar to the old document, the
document can be replace in-place.

> Also, I am thinking of indexing on the node id, as that is like the primary
> key on which I base my operations, any suggestions might also be helpful,

Here it may also be interesting to know if you will only address
documents or arbitrary nodes of your document. In the first case,
addressing the document path via db:open should be sufficient [1]. In
the latter case, you could possibly use the existing function
db:node-id [2].

Hope this helps,
Christian

[1] http://docs.basex.org/wiki/Databases
[2] http://docs.basex.org/wiki/Database_Module#db:node-id



> Thanks again,
> Regards
> Martin Lourduswamy
>
> On Sun, May 20, 2018 at 9:28 AM, Christian Grün <christian.gruen@gmail.com>
> wrote:
>>
>> Hi Martin,
>>
>> > I am new to BaseX, I would like ot speed up XQuery of insert and delete
>> > and
>> > replace through options.
>>
>> Welcome to the list. As there are numerous ways to do updates in
>> BaseX, feel free to give us more information on your insert and delete
>> operations. Do you work with large single documents or many small
>> documents? How large is your database?
>>
>> > While I query basex through perl, and try to
>> > connect through GUI, the perl connection aborts. Is there a parameters
>> > for
>> > parallel connections, please let me know.
>>
>> I can’t tell why your perl connection is interrupted by opening the
>> GUI (because they should be completely independent from each other). A
>> step-by-step description on how you proceeded might be helpful.
>>
>> Because there is no coupling between GUI and the client/server
>> architecture, however, you should avoid running updates outside the
>> GUI. Please check out [1] for more information.
>>
>> Best,
>> Christian
>>
>> [1] http://docs.basex.org/wiki/Startup#Concurrent_Operations
>>
>>
>>
>> >
>> > Thanks,
>> > Regards
>> > Martin Lourduswamy
>
>