To display the recent queries that used the most CPU, follow these steps:
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Go to the Cloud Spanner Instances page. 
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Click the name of the instance that contains your database. 
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In the Overview tab, click the name of your database. The Database details page appears. 
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Click Query stats. The list shows queries that had the highest total CPU usage for the complete one-minute interval that is the most recent. Below the list, the GCP Console displays the time at which the interval ended. 
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Click 10 min, 1 hour, or 24 hours to change the time period for the query statistics.