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

How can I count the number of keys between two values?

I use python driver and BTREE access method.

= >

Ideally, what I want is a set of whole time series data (intervals may change) to a given number of points on average. The keys are timestamps and the values are the data that it takes on average. I need to count the number of records between two timestamps so that I can divide this figure by the number of points I need and data on average. What is the best way to do it?  Or should I keep the timestamp constant intervals and use the RECNO access method?

Thank you
(first post btw... and why is there not a lot of people at stackoverflow that answering the questions of Berkeley DB?)

BDB is an integrated db and there no internal counters or statistics you might grap to use for this.    You will have to do it manually.

You can create a cursor, grap the records you want, whenever you get the next card that you bump a counter.

If you are using RECNO, you can use a slider to obtain the number of registration (DB_GET_RECNO), and if all that you data is in

sequentail records with no missing documents, you can find the total number of take the last rec #-original rec # + 1 to get a count.

If you pass the SQL API, you can issue a SQL query to give you a count.  Select count (*) where...

As you enter the data anyway, so better perhaps to count records as you go along.

Thank you

Mike

Tags: Database

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