What is a covering index in a database?
- An index that covers only a subset of the columns
- An index that covers the entire table
- An index that includes additional metadata
- An index that includes all columns required by a query
A covering index in a database is an index that includes all the columns required by a query. It allows the database to retrieve data directly from the index without needing to access the table, improving query performance.
Loading...
Related Quiz
- What are the key components of an effective alerting strategy for data pipelines?
- What does ETL stand for in the context of data engineering?
- Which normal form addresses the issue of transitive dependency?
- How does version control contribute to effective data modeling?
- What are the challenges associated with real-time data processing?