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Description
Since the beginning of LHC Run 2, the Trigger and Data Acquisition system of the ATLAS experiment at the Large Hadron Collider (LHC) at CERN has provided an operational monitoring data archiving service used by thousands of online clients. During data-taking periods, this system publishes various operational monitoring data to continuously monitor the status of hardware and software components at an average update rate of 600 kHz.
The service implementation used during LHC Runs 2 and 3 was based on a custom-built time-series database. However, it was decided to explore the possibility of replacing this system with a more recent, solid time-series database technology. After evaluating several options, the ClickHouse database was selected for the prototype.
This paper details the testing of ClickHouse using a subset of ATLAS operational monitoring data archived during LHC Run 3. It includes performance tests conducted on the testbed and compares the results with the current system.