I am using sqlite in an embedded application. The data store table
will be in its own file.
The data acquisition application will be storing a row every 1 to 5
seconds and cannot be interrupted for more than a couple seconds.
A web server will access the table for read access in two ways.
First, a live view of incoming data will read the latest row every 1 to
5 seconds. No problem there.
The second method is the problem as I see it. The user will be able to
request a copy of the last 12 hours, 7 days, or the entire data set,
to be sent to a USB stick or over the network. The data set will be
stored in comma delimited format.
In order to not interrupt the writing of data from the DAQ application I
think I should replicate the table or database and then dump the
required interval into comma delimited file.
Would a simple OS file copy of the database file be the quickest way to
copy the table? Locking it first, do a filecopy and then unlock?
Any other way to copy it faster?
Scott
--
-
Rightful liberty is unobstructed action according to our will within limits drawn
around us by the equal rights of others. I do not add "within the limits of the
law," because law is often but the tyrant's will, and always so when it violates the
rights of the individual.
Thomas Jefferson
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