Indexes
Indexes speed access paths; bitmap indexes suit low cardinality.
What you will be able to do
- Use B-tree for selective columns.
- Use bitmap for low cardinality.
- Gather statistics.
In plain English
Indexes speed access paths; bitmap indexes suit low cardinality.
- Use B-tree for selective columns.
- Use bitmap for low cardinality.
- Gather statistics.
CREATE INDEX lessons_course_idx ON lessons (course_id);Your turn
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Answer from memory: Which index type suits low-cardinality columns?
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Knowledge checkQuestion 1
Which index type suits low-cardinality columns?
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