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Types of DB2 Indexes
DB2 supports several types of indexes, each with its own advantages and disadvantages:
- Clustered Index: Organizes data rows physically on disk based on the index key. This can improve performance for range queries but may lead to slower inserts and updates.
- Non-Clustered Index: Stores a separate copy of the index key values along with pointers to the actual data rows. This allows for faster inserts and updates but may lead to slower query performance.
- Unique Index: Ensures that the indexed column(s) have unique values, improving data integrity. However, it may have a performance overhead due to uniqueness checks.
- Bitmap Index: Uses a bitmap to represent the presence or absence of values in the index, which can be efficient for columns with low cardinality but may consume more space.
- Partitioned Index: Divides the index data into multiple partitions, allowing for parallel processing and better performance on large tables. However, managing partitions can be complex.
Advantages and Disadvantages
Each type of index has its own set of advantages and disadvantages. It is important to consider the specific requirements of your database and workload to choose the right indexes for optimal performance.
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