Can you tell me how the bitmap index is stored? Basically I want to know the way it is stored inside the database and, during retrieval, how it is used to retrieve rows based on that. I have the basic idea that the bitmap index will create a bitmap for each distinct value that exists in the table and accordingly it will have the start rowid and end rowid mapped to the bitmap value. Here I want to know how the bitmap is created, e.g., 10000101010. Please help me.

    Requires Free Membership to View

Bitmap indexes are stored as an array of zero-and-one values, with one entry for each row. Bitmaps are created by doing a full-table scan of the indexed table, and they are very slow for updates.

Here are some tips on using bitmap indexes.

This was first published in November 2005

There are Comments. Add yours.

TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to: