How do you identify index used for query? It is a popular question in my health checks, and this SQL in Sixty Seconds video shows the easy way.
Multiple Aggregates in One Query: Read the Table Once
Multiple aggregates in one query read a table once, where separate subqueries read it again and again. This post measures the logical reads of two subqueries against one SELECT, uses CASE inside SUM for different filters, and shows two cases where the rewrite gains nothing or loses to an index.
How to Force Index on a SQL Server Query? – Interview Question of the Week #281
Question: How to Force Index on a SQL Server Query?
Answer: I personally do not like to force an index on any query. Let us learn together.
How to Alter Index to Add New Columns in SQL Server? – Interview Question of the Week #278
Question: How to Alter Index to Add New Columns in SQL Server?
Answer: It is not possible to Alter Index definition to add or remove columns.
Duplicate Statistics: Auto-Created Stats That Shadow Index Statistics
Find duplicate statistics on index-leading columns, compare freshness and sampling, and generate cautious DROP STATISTICS candidates.
Rebuild All Indexes on a Table in SQL Server: SSMS and T-SQL
To rebuild all indexes on a table, right-click the Indexes folder in SSMS and choose Rebuild All, or run ALTER INDEX ALL with REBUILD. This post checks fragmentation first, rebuilds a demo table and shows what the command does to a disabled index. It also compares REBUILD with REORGANIZE and the options that matter.
SQL SERVER Management Studio – Rebuild All Indexes on Table
SSMS can open a Rebuild All dialog for table indexes. An e-commerce customer discovered this shortcut during my health check.