Count the number of records between two key values (BTREE)

How can I count the number of keys between two values?
I'm using python driver, and BTREE access method.
====>
ideally what I want is to average a whole time-series data set (the intervals can change) to a given number of points. The keys are the time stamps and the values are the data that needs to be averaged. I need to count the number of records between two time stamps so that I can divide that number by the number of points i need, and average the data. What is the best way to do this? Or should I just keep the intervals for the time stamp constant and use RECNO access method?
Thank you
(first post btw.. and why aren't there many people in stackoverflow who answer Berkeley DB questions?)

BDB is an embedded db and it does not have any internal counters or statistics that you could grap to use for this. You will need to do it manually.
You can create a cursor, grap the records you want, each time you get the next record you bump a counter.
If you are using RECNO, you can use a cursor to get the record number of the record (DB_GET_RECNO), and if all you data is in
sequentail records with no missing records you can figure out the total count by take last rec # - initial rec # + 1 to get a total count.
If you switch over to the SQL API, you can issue a SQL query to give you a count. Select count(*) Where .......
Since you have to grab the data anyway, then best may be to count records as you go along.
thanks
mike

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Count the number of records between two key values (BTREE)

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