On mån, 2008-05-12 at 09:36 +0530, Rupa P V wrote:
> I am trying to find the correct mib2c conf file for implemeting the
> low level snmp routines for my database. These are my requirements:
>
> 1) Given the index/indices in the OID extracted from the SNMP Varbind,
> I can directly access the node which has the required info. I don't
> want to go through a getfirst-getnext cycle to find the correct row
> for an SNMP GET request. My database is maintained as a hash table and
> so I can access my data by hashing on my indices.
>
> 2)My data base is not sorted, so for SNMP GetNexts , I dont mind
> getfirst-getnext cycles being called.
This is problematic.
For GET and SET you should be able to use the basic table helper (not an
mib2c template, I mean the helper!)
The problem is with GETNEXT, you are given an index value and are then
expected to return either the first entry with key > index or the first
entry with key >= index, now given that your data are stored in a hash
table you need to somehow store the information of where to find the
next item. Thus the optins I can see are
* Keep an ordered index over the existing keys, either in a
separate table or as part of the objects of the first table.
(cost: memory, complexity)
A variation of this is to change the dataase to an ordered data
structure (cost: depends on the data structure, complexity)
* Make exhaustive search of the index set. (cost: performance)
/MF
> I tried mfd (unsorted external also) and iterator options , but
> iterator iterates through the getfirst-getnext cycles for a single
> SNMP GET itself. If mfd is used, then there is memory required for
> cache.
>
> Is there a method which meets these requirements without iteration and
> cache ? I am using netsnmp 5.4.1.
> Plz let me know if anyone knows the answer.
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