[SNMP4J] TableUtils: The difference between sparse and dense tables

[Frank Fock]

Hi,

A dense table is something like:

Index | Values
1     | 1 one xxx
3     | 3 three zzzz
3845  | 4 four kdjfgh

Then a sparse table is:

Index | Values
1     | 1 one xxx
3     | 3     zzzz
3845  |   four kdjfgh

where individual cells are missing (there are not NULL,
because NULL must not be returned by an agent on GETNEXT
or GETBULK).

Best regards,
Frank


On 16.03.2010 17:01, Omair-Inam Abdul-Matin wrote:
> Hi,
>
> I was under the impression that the difference between sparse and dense
> tables is that a sparse table does not have entries for a given MIB variable
> at consecutive index whereas a dense table does.  However, I ran the
> SNMPRequest test app on an app in dense and sparse table mode and in both
> modes it was able to fetch nonconsecutive entries correctly:
>
> Arguments: [-c, public, -v, 2c, -Ot, 10.4.115.198, 1.3.6.1.2.1.2.2.1.2]
> Index = 1:
> 1.3.6.1.2.1.2.2.1.2.1 =
> 4d:53:20:54:43:50:20:4c:6f:6f:70:62:61:63:6b:20:69:6e:74:65:72:66:61:63:65:00
>
> Index = 65539:
> 1.3.6.1.2.1.2.2.1.2.65539 =
> 50:61:72:61:6c:6c:65:6c:73:20:45:74:68:65:72:6e:65:74:20:41:64:61:70:74:65:72:00
>
> Arguments: [-c, public, -v, 2c, -Otd, 10.4.115.198, 1.3.6.1.2.1.2.2.1.2]
> Index = 1:
> 1.3.6.1.2.1.2.2.1.2.1 =
> 4d:53:20:54:43:50:20:4c:6f:6f:70:62:61:63:6b:20:69:6e:74:65:72:66:61:63:65:00
>
> Index = 65539:
> 1.3.6.1.2.1.2.2.1.2.65539 =
> 50:61:72:61:6c:6c:65:6c:73:20:45:74:68:65:72:6e:65:74:20:41:64:61:70:74:65:72:00
>
> Can someone explain to me what the difference, then, is between a sparse
> table and a dense table?
>
> Thanks,
>
> Omair
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