This slow query cartoon from Community TechDays in Ahmedabad answers a slow query with questions, not an automatic index. The tests here measure a full index against a filtered index, show why a function on a column forces a scan, and show a parameter case where the filtered index is skipped.
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SQL SERVER – Query Optimization – Remove Bookmark Lookup – Remove RID Lookup – Remove Key Lookup – Part 3
Part 3 of how to Remove Bookmark Lookup, RID Lookup and Key Lookup. A covering index holds every column the query uses in SELECT, JOIN and WHERE.
Connecting PHP to SQL Server
Connecting PHP to SQL Server means choosing SQLSRV or PDO_SQLSRV, binding parameters, validating TLS, and keeping web queries efficient.
The Implicit Conversion That Quietly Kills Your Index
Find an implicit conversion in your SQL Server plan, understand which value changes type, and match application parameters to indexed columns.
SQL SERVER – Queries Waiting for Memory Allocation to Execute
Find queries waiting for memory allocation with sys.dm_exec_query_memory_grants, plus wait_order and the query plan, when you suspect memory is short.
SQL SERVER – Query Optimization – Remove Bookmark Lookup – Remove RID Lookup – Remove Key Lookup – Part 2
Part 2 compares two ways to remove key lookup and remove RID lookup: a covering non-clustered index versus an index with included columns.
SQL SERVER – Query Optimization – Remove Bookmark Lookup – Remove RID Lookup – Remove Key Lookup
A quick tip to remove bookmark lookup, RID lookup or key lookup: why it happens when a query needs columns missing from the non-clustered index.
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