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/

Recent Questions at Ask.Use-The-Index-Luke.com

0
votes
1
answer
54
views

We want to buy the book but I can't

Jul 18 at 21:36 Markus Winand ♦♦ 541
book
0
votes
2
answers
116
views
0
votes
0
answers
768
views

Performance very bad in Postgresql 9.3

Jul 08 at 11:54 Markus Winand ♦♦ 541
performance issue