Q

How is the bitmap index stored?

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.

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.
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

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