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.

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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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