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so in the last video we talked about the b-tree index which is the relational indexing most common type of index but we will talk about two others here with relational models and the first of those is the bitmap index this is also used in data warehouse scheme so rollout databases and the idea is you use a bit array to describe the presence or the absence of a particular value or a condition so the benefits is when you have lots of rows that have just a few values but those few values are repeated quite a bit a bitmap index can save you a lot of storage space in a situation like that over a b-tree which is pretty complex so theyre easy also to combine with other bitmap indexes so you can kind of do some very fast queries using bitmap indexes but the drawback is if youre inserting or updating values these are not very efficient so heres an example of a bitmap index the bitmap is laid out on the left side with northeast northwest southeast Southwest as the particular bitmap values so