The Five Mistakes You are Probably Making with SQL Server Kathi Kellenberger Auntkathisql.com @auntkathi Kathi.Kellenberger@linchpinpeople.com

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Who am I? Data Platform MVP Trainer Author Consultant

Agenda Configuration Maintenance Reusability Index Strategy SARGability

Configuration

Configuration Memory Parallelism Ad hoc workloads Database location

Maintenance https://ola.hallengren.com/ Easy Knowledge required Not flexible Better than no maintenance Maintenance Wizard Knowledge required Flexible Available on web Scripts https://ola.hallengren.com/

Reusability

Reusability Avoid Do Nested views Scaler and multi-line functions that touch tables Do In-line table valued functions Stored procedures Temp tables

Index Strategy

Index Strategy Don’t blindly follow DTA or index suggestions Avoid duplicate / overlapping indexes Remove unneeded indexes Avoid Key Lookups and Index Scans https://www.sqlskills.com/blogs/jonathan/finding-key-lookups-inside-the-plan-cache/

SARGability

SARGability Avoid Do Functions on columns Implicit conversions Query on secondary column Scan Do Rewrite WHERE clause Query on first column Seek

Contact Information Kathi Kellenberger Auntkathisql.com @auntkathi Kathi.Kellenberger@linchpinpeople.com http://www.linchpinpeople.com/7stepchecklist