Slow reads as follows: my data is meaningful to use with Berkeley DB?

Hello

My speed of insertion is wonderful, but I feel slow bed. It may be the way I use the sliders.

My key is a double. My data looks like this: (int X, int dontcare, int dontcare1, dontcare2 byte [8]).

I'm trying to do a 'select' statement that uses a slider to look through a RANGE of keys. In this range, the cursor looks like inside the data to find specific records which have a particular value of X (int). I ask if my data is logical to use with Berkeley DB because to find records in the beach is fast (VERY fast), but to iterate through all the records in the range, open the data and then analyze int X to see if X == someparticularvalue seems to be very slow. Because I go INTO the data to find particular values of X, this prevents me from using the getSearchBothRange() method.

PSEUDOCODE:
COUNTER = 0
Open a cursor
getSearchKeyRange to find the key value closest to you at the beginning of my range of keys
WHILE the value of getnextnodup is still in the range I'm looking for & & COUNTER < LIMIT_NUM_OF_RECORDS
get data
IF data.x is particularValue
memorize the current folder
counter ++
END IF
END WHILE

(because Berkeley DB forces the user to manage low level to research, I fear that I use one) not correctly b) do not effectively research the sliders. I could remove the "counter < limit_num_of_records" and put it in my IF statement and break when the condition is met, but I don't think it really makes a huge difference over time.

Help would be greatly appreciated.

Thank you
Julian

Julian,

I hope that I don't mislead you. This only works if the values of k1 are sequential and known in advance.

int k2 = ...
for (double k1 = start; k1 <= end; k1 += 1) {
    // make a key {k1, k2}
    // call Database.get or Cursor.getSearchKey
}

If this is not possible, you will need to return to an analysis of the values of k1 and select by k2. Sorry if I'm wrong you.

There is nothing magical about the queries I. The only mechanism underlying query is key or key range. You can add secondary keys for additional requests, but only if you have a unique primary key.

The same is true for all databases in general. If you were using a language such as SQL query, the query would likely be implemented internally by scanning of a range of key for k1 and selecting by k2.

-mark

Tags: Database

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