• How do you troubleshoot performance issues related to disk I/O ?

  • How do you optimize queries that use common table expressions (CTEs)? Expert Level

  • How do you use columnstore indexes to improve performance?

  • Describe your experience with performance tuning tools.

  • How do you use the Query Store to analyze query performance ?

  • How do you troubleshoot performance issues related to network latency ?

  • What are some considerations for optimizing stored procedures that are called frequently? Expertise Level: Mid to Expert

  • How do you use compression to improve performance ?

  • How do you usepartitioningtoimprove performance?

  • How do youoptimize queriesthat usedynamic SQL?

  • How do you use the DMVs to monitor and troubleshoot performance?

  • How do you optimize queries that use temporary tables ?

  • Explain the difference between table scans and index seeks .

  • How would you approachoptimizingaslow-running queryin aproduction environment? Expertise Level: Mid-Level

  • What are some common mistakes to avoid when optimizing SQL Server performance?

  • How do you use hints to influence the query optimizer?

  • How do you use statistics to improve query performance?

  • What is theimpact of data typesonperformance?

  • How do you identify and resolve blocking issues?

  • How do you use performance counters to monitor SQL Server performance?

  • What are some common performance tuning techniques for SQL Server?

  • How do you optimize queries that use subqueries ?

  • What are some best practices for writing efficient SQL queries ?

  • How do you use the SQL Server Profiler to troubleshoot performance issues ?

  • How do you identify and resolve deadlocks? Expertise Level: Mid Level