Avekshaa Technologies Oracle Database Administrator Interview Questions and Answers

B-tree index is the default index type in Oracle database.

• Default index type in Oracle is B-tree index

• B-tree index is suitable for range queries and equality searches

• Other index types in Oracle include bitmap index and function-based index

Causes of query slowness can include inefficient queries, lack of indexes, outdated statistics, hardware limitations, and network latency.

• Inefficient queries - poorly written queries that do not utilize indexes or join tables unnecessarily

• Lack of indexes - missing indexes on columns frequently used in queries

• Outdated statistics - outdated or inaccurate statistics can lead to poor query execution plans

• Hardware limitatio...read more

To resolve query slowness, analyze query execution plan, optimize indexes, update statistics, consider partitioning.

• Analyze query execution plan to identify bottlenecks

• Optimize indexes to improve query performance

• Update statistics to ensure the query optimizer has accurate information

• Consider partitioning large tables to improve query performance