berkeley-db

问题 I create a Berkeley database, and operate with it using bsddb module. And I need to store there information in a style, like this: username = '....' notes = {'name_of_note1':{ 'password':'...', 'comments':'...', 'title':'...' } 'name_of_note2':{ #keys same as previous, but another values } } This is how I open database db = bsddb.btopen['data.db','c'] How do I do that ? 回答1: So, first, I guess you should open your database using parentheses: db = bsddb.btopen('data.db','c') Keep in mind that

问题 Our application uses berkeley db for temporary storage and persistance.A new issue has risen where tremendous data comes in from various input sources.Now the underlying file system does not support such large file sizes.Is there anyway to split the berkeley DB files into logical segments or partitions without losing data inside it.I also need it to set using berkeley DB properties and not cumbersome programming for this simple task. 回答1: To my knowledge, BDB does not support this for you.

问题 I'm trying to tackle a problem by using a SQLite database and Perl modules. In the end, there will be tens of millions of entries I need to log. The only unique identifier for each item is a text string for the URL. I'm thinking of doing this in two ways: Way #1: Have a good table, bad table, unsorted table. (I need to check the html and decide whether I want it.) Say we have 1 billion pages total, 333 million URLs in each table. I have a new URL to add, and I need to check and see if it's in

问题 I am trying to understand what should drive the choice of the access method while using a BerkeleyDB : B-Tree versus HashTable. A Hashtable provides O(1) lookup but inserts are expensive (using Linear/Extensible hashing we get amortized O(1) for insert). But B-Trees provide log N (base B) lookup and insert times. A B-Tree can also support range queries and allow access in sorted order. Apart from these considerations what else should be factored in? If I don't need to support range queries

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . Berkeley DB (JE) licensing may be a deal killer. I have a Java application going to a small set of customers but as it is a desktop application, my price cannot support individual instance licensing. Is there a recommended Java alternative to Berkeley DB? Commercial or otherwise (good key-value store

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . Berkeley DB (JE) licensing may be a deal killer. I have a Java application going to a small set of customers but as it is a desktop application, my price cannot support individual instance licensing. Is there a recommended Java alternative to Berkeley DB? Commercial or otherwise (good key-value store

问题 How can I determine current version of my repository to see if I need to upgrade it (svnadmin upgrade)? In reality I'm hosting SVN with 3rd party and I want to find out if I need to ask them to upgrade my repos or not. I'm asking since 1.5 server will keep repo version at 1.4, unless I miss something? 回答1: Have a look at <REPO>/db/format . After upgrading to 1.5 format, my format file shows: 3 layout sharded 1000 Before it used to be: 2 回答2: Take the http or https link to your repository and

问题 Say I have a simple table that contains username, firstname, lastname. How do I express this in berkeley Db? I'm currently using bsddb as the interface. Cheers. 回答1: You have to pick one "column" as the key (must be unique; I imagine that would be "username" in your case) -- the only way searches will ever possibly happen. The other columns can be made to be the single string value of that key by any way you like, from pickling to simple joining with a character that's guaranteed to never

问题 I have a html form which has Firstname , LastName , Age and Gender and a ADD button. I enter the data into the form and that gets into the Berkeelys db. What my code does is it prints only the last values. I want that it should show all the values related to particular key #!/usr/bin/python import bsddb import cgi form = cgi.FieldStorage() print "Content-type:text/html\n" Fname = form.getvalue('firstname', '') Lname = form.getvalue('lastname', '') Age = form.getvalue('age', 0) Gender = form

问题 I read the subversion book and it is clear to me that subversion does not store individual files but only deltas in order to minimize disk space. Subversion also does the same with binary files as well (this used to be a huge weakness of CVS). However I do not understand the exact mechanism. When I commit a file what happens? Subversion stores only the diff (and already has the old version) Subversion deletes the previous version, stores the new file intact and creates a reverse diff in order