Secondary Index


A secondary index is an index that refers to a clustered index (SQL Server, MySQL/InnoDB) or Index-Organized Table (Oracle). In other words, an index on an index.

Accessing table data via a secondary index is slower than a similar query on a heap-table.

About the Author

As an author, trainer, and coach Markus Winand specializes in helping developers cope with SQL performance issues. He also published the book SQL Performance Explained and tweets his best performance tips via @SQLPerfTips.http://winand.at/

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