Indexing for Windowing Functions: WHERE vs. OVER

Erik Darling shows that if you take SQL Server's word when it asks for an index, things can go horribly awry.

Index Creation

Index Utilization Summary

This report shows all the Indexes on user defined table or view and how effectively they are being used in our project.

One way to get an index seek for a leading %wildcard

In an effort to make leading wildcard searches sargable, Aaron Bertrand plays around with a trigram-type implementation in SQL Server.

Missing index with change impact percentage

This script will list all missing indexes with create statements.

Internal Query Processor Error with ColumnStore Indexes

SQL Server 2016 does not allow computed columns to co exist with columnstore indexes and clustered btree indexes on same table.

Which Indexes are not Used?

During the development cycle, indexes will be placed on SQL Server tables to speed up performance when searching for records. Lots of thought probably has gone into creating just the right mix of indexes based on how developers think customers will use the system. But how do you tell if all the indexes are being used once your database has been implemented into production?

CREATE TABLE and Indexes

Heaps and indexes

Index IDs