Interview Questions
1. What are the benefits of Column Stored index?
The benefits of using a non-clustered column store index are:
- Only the columns needed to solve a query are fetched from disk (this is often fewer than 15% of the columns in a typical fact table)
- It is easier to compress the data due to the redundancy of data within a column
- Buffer hit rates are improved because data is highly compressed, and frequently accessed parts of commonly used
columns remain in memory, while infrequently used parts are paged out.
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