Agentless Monitoring solutions are very helpful when monitoring high level server resource usage such as CPU, memory, disk, etc. However not that helpful in detecting/monitoring with 99.9% accuracy poor OLTP SQL performance (i.e. SQL requests with degraded or poor end-user response time).
SQL Wait Time monitoring is helpful when monitoring data warehousing or data mining SQL where the SQL typically runs longer than 2 seconds.
Issue millions of ad hoc SQL requests to the monitored servers that bloat the procedure cache and cause expensive SQL compilations to occur 24×7.
Install tables, stored procedures or SQL Agent Jobs on monitored servers. Nor create tables in TempDB or issue millions of I/Os on monitored database servers.
Increase the monitored database server SQL wait time (due to resource contention) thereby impacting production users end-user response time.
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