Disadvantages of Bit Vector/Bit Map

Q3. What are the disadvantages of Bit Vector/Bit Map?

Ans. Unfortunately, bit vectors are inefficient unless the entire vector is kept in main memory and is written to disk occasionally for recovery needs.

For example:

Block size = 212 bytes

Disk size = 230 bytes

 

n = 230/212

=> n = 230-12

=> n = 218 bytes

=> n = 32 KB

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