anup.kalbalia@gmail.com wrote:
> On May 24, 10:13 pm, "B. Augestad" <b...@metasystems.no> wrote: 
[vbcol=seagreen]
>
> 1. I would correct myself by replacing the term real-time by "having
> bounded response times". By real-time I meant that the server has to
> respond extremely quickly.

And what do you mean by "extremely quickly"? ;-)

> 2. There shall be both UDP and TCP packets sent to the client.

To the client or to the server? I assumed that the client sent the data
to the server, is that incorrect?

> But
> there is some data (like ticker data where guaranteed packet delivery
> is not essential) which does not require to be TCP as it can do away
> with the associated overhead.

Is there really much overhead to use TCP if you're going to use both TCP
and UDP anyway? (Assuming that the network isn't a bottleneck and
drops/retransmits)

> 3. Clients can be around 10000 or even more...scalability is a big
> issue. Data will be huge and shall be of the range of 20-50 Kbps
> during peak hours

So you'll have 10000 clients, each sending 50 kilobytes per second. (or
is that bits per second?) That's 488MB/s of data.

If you plan to shove that much data into an Oracle database, you have an
interesting project. Even assuming that you meant bits instead of bytes
and that you have a significant protocol overhead, you still have to
move dozens of MB/s.

Even if you can make the TCP/UDP server fast enough, the database server
and the IO subsystem will probably become a bottleneck.

Q: Any idea of the transaction sizes(KB) and the number of
transactions/second?
Q: Any thoughts on what hardware/os you plan to run this on?

> 4. UDP Data shall be generally binary data.

Can you accept packet loss?

> 5. Database can be Oracle/SQL. I am also keen on using some in memory
> database to improve performance. still tinkering with them. Any
> suggestion on that shall be helpful too.

Berkeley DB?
http://www.oracle.com/technology/pr...y-db/index.html

BTW, you probably want to read this asap: http://www.kegel.com/c10k.html

Bjørn

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