Hi Fulko
Thanks for your information, it’s really helpful.
Thanks,
Barclay
________________________________
From: Fulko Hew [mailto:fulko....@gmail.com]
Sent: 2013年4月27日 3:13
To: Zheng, Wenjie (Barclay)
Cc: net-snmp-coders@lists.sourceforge.net; net-snmp-us...@lists.sourceforge.net
Subject: Re: Row operation in Net-SNMP
On Thu, Apr 25, 2013 at 11:14 PM, Zheng, Wenjie (Barclay)
<barclay.zh...@alcatel-lucent.com<mailto:barclay.zh...@alcatel-lucent.com>>
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:fulko....@gmail.com<mailto:fulko....@gmail.com>]
Sent: 2013年4月24日 20:22
To: Zheng, Wenjie (Barclay)
Cc: Dave Shield;
net-snmp-coders@lists.sourceforge.net<mailto:net-snmp-coders@lists.sourceforge.net>;
net-snmp-us...@lists.sourceforge.net<mailto:net-snmp-us...@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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