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:fulko....@gmail.com]
Sent: 2013年4月24日 20:22
To: Zheng, Wenjie (Barclay)
Cc: Dave Shield; net-snmp-cod...@lists.sourceforge.net;
net-snmp-users@lists.sourceforge.net
Subject: Re: Row operation in Net-SNMP
On Wed, Apr 24, 2013 at 2:02 AM, Zheng, Wenjie (Barclay)
<barclay.zh...@alcatel-lucent.com<mailto:barclay.zh...@alcatel-lucent.com>>
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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