Re: "Real-time" database reads

Tom Gwozdz wrote:
> We are collecting a whole lot of telemetry data, and we would like
> to store it all in a database (so that we can analyse it easily later
> on). We then have a custom front end to the database, which can do
> two things:
> - One, it can read and graph old data from the database (which we can
> get with a simple query, for a specific time range that we want).
> - Two, as the new data comes in, we would like to update the graphs in
> real-time.
>
> We could do this by constantly re-querying the database to read the
> new data, but is there an easier way of doing it, without bypassing
> the database?

Hi Tom,

our object database offers callback events, that notify objects about changes. Maybe you could use these to update your graph.

Judging from your mail, you need good insert performance. This is the domain of our engine since we store objects directly without detours through SQL strings or driver overhoad. It outperforms everything we have tested it against. Some benchmark code for comparison against JDBC comes with the download.

Kind regards,
Carl

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Carl Rosenberger
db4o - database for objects - http://www.db4o.com