What are the advantages and disadvantages of Oracle ind…

Advantages of Oracle indexing include:

1. Improving query performance: Indexes can enhance the speed of data retrieval, particularly when retrieving large amounts of data from a large database.
2. Reduce disk IO: Indexing can decrease the number of times disk IO is performed, improving query performance by reducing disk access.
3. QuickSort: Indexing can speed up the sorting operation, especially when sorting is done under certain conditions.
4. Enhance data integrity: Indexing can enforce uniqueness and integrity constraints, ensuring data consistency.
5. Support fast data access: Indexing allows the database system to quickly access data, providing a more efficient way of accessing data.

Disadvantages of Oracle indexes include:

1. Using storage space: Indexing will consume additional storage space, especially when indexing multiple columns or columns with a large amount of data.
2. Increasing the cost of write operations: When performing data modification operations (such as inserts, updates, deletes), the indexes need to be updated, which increases the cost of write operations.
3. High maintenance costs: When there are changes in the data, the index needs to be maintained, including adjusting the index structure and rebuilding the index, which increases additional maintenance costs.
4. It is important to choose the appropriate index: selecting an unsuitable index may result in decreased query performance or added storage space.
5. Having too many indexes may complicate the query optimizer and potentially lead to performance degradation.