SQL Server performance

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SQL Server Perfmon counters that are still interesting in 2019

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Years ago, my first go-to tool for performance tuning was Performance Monitor: it was available everywhere, worked in all versions, and gave me a lot of useful information without paying for a monitoring tool. Since then, I’ve moved on – wait stats are a much better starting point – but there are still 3 good Perfmon counters that I rely on.

2019-02-13

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Question of the Day

Always On AG Latency for Read-Only Workload After Failover?

You're responsible for managing a SQL Server environment using Always On Availability Groups across two data centers. During a recent planned failover to the secondary replica, you noticed increased application latency and errors related to read-only routing. Upon investigation, you discover that read-only routing continues pointing to the former primary, now a secondary, for a period of time after the failover.
Which of the following best explains this behavior and how to resolve it?

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