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Retrieving and Presenting huge data

Nagendra Inuguri
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Joined: Jan 08, 2004
Posts: 76
Hi,

I have a query that returns millions of records from Oracle database, and
I need to present this data to the user in JSPs. I need to show this data
page by page. So I will have buttons called "Next", "Previous" in the JSP
and allow the users to navigate through the records. While pressing the
Next button I don't want to connect to database and show the next page.
Which is the best way to achieve this?

Any feedback is greatly appreciated.

Thanks,
Nagendra.


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Loren Rosen
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Joined: Feb 12, 2003
Posts: 156
If you absolutely insist on not going back to the database, you'll have to read in all the millions of records into some data structure in your middle tier, store that in say, session state, and write JSP to access it. This can be done, but will consume lots of middle tier memory, network bandwidth, database resources, and take a long time to run. And your users won't actually look at more than a tiny fraction of these millions of records. Are you sure this is what you want?
Bear Bibeault
Author and ninkuma
Marshal

Joined: Jan 10, 2002
Posts: 61772
    
  67

As Loren points out, if your intent on "not going back to the database" is to improve performance, you are barking up the wrong tree.


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Jeffrey Hunter
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Joined: Apr 16, 2004
Posts: 305
Also, as has been pointed out, millions of records will be quite overwhelming to a user, as a user is likely to access only a small fraction. Serve them up a menu, presenting the data in logical units. For instance, if you have millions of items in an inventory, break the set down logically (e.g. cosmetics, sporting goods, etc). This way, a user can retrieve a manageable set of data at any given time.

Sure, each time the user desires to access a new logical unit, you need to fire off a request to the database, but I believe this strategy is a bit more elegant that taking the entire cake and eating it in one mouthful.
 
It is sorta covered in the JavaRanch Style Guide.
 
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