On 26 January 2012 17:30, Francois Bouchard <[email protected]> wrote:
> In our SNMP agent, there is a table of data that we need to acquire from a
> text file. These data are read only, but can change within seconds in the
> text file.
How large is the table, and how quickly does the data change?
How is this information likely to be used on the management side?
The main problem with rapidly-changing data (particularly if rows are
being created and destroyed), is that the management clients can
easily find the table changing under its feet.
Plus if the table is large, then there can be a noticeable overhead
in loading and parsing the table data for each individual incoming request.
It's often useful to take a 'snapshot' of the current state of this table, and
cache this within the agent for a little while. Subsequent requests will
then be processed from this cached version, rather than reloading the
data afresh each time.
The cache timeout can be set relatively low (e.g. one or two seconds),
as long as this is sufficient to cover a full walk of the table.
> I was wandering which script for table is the most recent one?
I'm not entirely sure what you mean by the "most recent" table framework,
or how useful this information would actually be to you.
Most of the table frameworks would allow you to hold a local cache,
and work in the way described above.
Personally, my template of choice tends to be 'table_data'
so I'd probably start by running
mib2c -S cache=1 -c mib2c.table_data.conf myTable
and work from that.
Others (Robert in particular) prefer the MfD framework, which also
supports the option of a local cache. You've get that by running
mib2c -c mib2c.mfd.conf myTable
and answering the questions it asks.
You pays your money, and you takes your choice.
Dave
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