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SQL-Server-First-Responder-Kit
sp_Blitz, sp_BlitzCache, sp_BlitzFirst, sp_BlitzIndex, and other SQL Server scripts for health checks and performance tuning.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Either sp_WhoIsActive, or you can look into First Responder Kit - https://github.com/BrentOzarULTD/SQL-Server-First-Responder-Kit/tree/main - specifically sp_BlitzCache stored procedure, which, by default, will list out the most CPU expensive query in SQL Server plan cache. This should help you identify the "problematic" query.
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