File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
The moose likes Performance and the fly likes Local datastructure Vs DB Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Java » Performance
Bookmark "Local datastructure Vs DB" Watch "Local datastructure Vs DB" New topic

Local datastructure Vs DB

Vijay Kumar
Ranch Hand

Joined: Jul 24, 2003
Posts: 260
Hi Friends,


Due to high traffic and frequent login , I have to proposed a best solution.

Solution 1: Need to interact every time a DB to do a select query with where clause for loginid,password and active.
Solution 2: Load member login details as soon as container gets up and put in to local data structure like. a bean object for member details and a hashmap with login id as Key and bean object as value. As soon as user submits details, it will be validated by local data structure. Off course I need to provide a method which will sync the local data structure with DB when ever a new user registered.

Please suggest which one is good or any other idea.


Ireneusz Kordal
Ranch Hand

Joined: Jun 21, 2008
Posts: 423
Solution 1 requires one select query and 1 update query - 2 database round-trips on every login.
Solution 2 requires update of DB on every login (fields: IS_ACTIVE, LASTLOGIN) - only 1 database round-trip, but consumes some resources (memory) on caller's computer.
Solution 3: create stored procedure on DB that validates user, update DB if validation succeed and return true/false to the caller with only 1 database round-trip,
and no resources consumed on caller's computer.
Vijay Kumar
Ranch Hand

Joined: Jul 24, 2003
Posts: 260
Hi Ireneusz Kordal,

Thanks for your reply.

Kees Jan Koster
JavaMonitor Support

Joined: Mar 31, 2009
Posts: 251
Dear Vijay,

Caching in Java has the added problem that you cannot change the data in the database and see the changes in the application. Depending on your app this may or may not be an issue. Just keep in mind that caches need purging and refreshing mechanisms and they cost time to maintain.

Kees Jan

Java-monitor, JVM monitoring made easy <- right here on Java Ranch
I agree. Here's the link:
subject: Local datastructure Vs DB
It's not a secret anymore!