Re: Row operation in Net-SNMP

On Thu, Apr 25, 2013 at 11:14 PM, Zheng, Wenjie (Barclay) <
[email protected]> wrote:

>  Hi Fulko****
>
> ** **
>
> Thanks for your response.****
>
> Do you have any good examples or suggestions on how I can itorate the
> table in Getbulk operation in row instead of column?
>

You can't..  Traversing an OID tree happens in lexicographical order, and
so would getbulk.
The only way to traverse a row (rather than a column) is to do it yourself
(assuming you know
what columns you want to get.

****
>
> ** **
>
> Thanks,****
>
> Barclay****
>
> ** **
>  ------------------------------
>
> *From:* Fulko Hew [mailto:[email protected]]
> *Sent:* 2013年4月24日 20:22
> *To:* Zheng, Wenjie (Barclay)
> *Cc:* Dave Shield; [email protected];
> [email protected]
> *Subject:* Re: Row operation in Net-SNMP****
>
> ** **
>
> ** **
>
> On Wed, Apr 24, 2013 at 2:02 AM, Zheng, Wenjie (Barclay) <
> [email protected]> wrote:****
>
> Hi, Dave et al,
>
> I have a puzzle of Net-SNMP table operation, for example I have a table
> like below:
>
> a1-a2-a3-a4
> b1-b2-b3-b4
> c1-c2-c3-c4
>
> In net-snmp, if I use iterator helper to implement the table handler, it
> will translate the getbulk request to bunch of get request, the order is:
> a1->b1->c1->a2->b2->c2.....
>
> So it's first column then send column and so on. In my case, the data is
> stored ourside in row order, like first row, second row.
> a1->a2->a3->a4->b1->b2....****
>
>
> The iterator, just like the definition of how getNext() works, is:
> it follows OIDs 'in order'; and OIDs define entries as:
>
>    table.column.index...
>
> So the indexes are all traversed first ... before it 'backs up' to go to
> the next column
>   ... before it goes to the next table... etc.
>  ****
>
> I can read the whole row one time, and then return all the values for the
> whole row. Then I only need read outside data 3 times for the whole table.
> But in the iterator helper, I will need to read outside data 12 times for
> the whole table.****
>
>
> That is indeed what you need to do if you want to optimize/minimize the
> number of
> transactions on the network. ****
>
> ** **
>

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