RE: Row operation in Net-SNMP

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?

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]<mailto:[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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