Hi,
Thank you for your reply. Now I had known that the iterator helper
is inefficient for large tables and I should try other helpers for my apps.
And if the data requested is internal my agent, which kind of helper should
I choose instead of the iterator helper.
Looking forward to your reply.
Best regards
On Mon, Mar 15, 2010 at 7:10 PM, Dave Shield <d.t.shi...@liverpool.ac.uk>wrote:
> On 15 March 2010 10:29, bai haoquan <baihaoq...@gmail.com> wrote:
> > To my understanding, it will cause performance problem when there are
> mass
> > of data.
>
> Yes - the iterator helper is notoriously inefficient for large tables.
> It's probably not a sensible choice if performance is an issue.
> Use one of the other helpers instead.
>
> > I have no idea that why we have to traverse
> > the whole 200 nodes every time to get a value
>
> Remember that the iterator helper was specifically designed
> for tables where the data is stored in "random" order.
> So the expectation is that you'd always have to search the
> whole internal table, in order to find the "next row" in SNMP ordering.
>
> There is a flag that can improve performance if the internal
> indexing matches the SNMP ordering, but it's still probably
> not the most efficient of the helpers.
>
>
> Remember too that the "get_first/get_next" loop is run
> for each individual GETNEXT request.
> The "get_next" calls do *NOT* correspond one-to-one
> with the incoming GETNEXT requests of the snmpwalk
> or snmptable command.
>
>
> > Do I have any misunderstanding? Look forward to your early reply and
> > some good advices for this problem.
>
> My best advice is to use a different helper!
>
> Dave
>
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