The reason for the execution is that the query times out and the cache cannot be established. Through the clouddba on the RDS console of Alibaba cloud, you can see that the SQL statement for getting the home page blog post has been executed more than 30000 times during the fault period. The IOPs of the database server increased dramatically. The CPU consumption of the database server (alicloud RDS SQL Server 2016 instance) increased dramatically. The timeout period elapsed prior to completion of the operation or the server is not responding. 06:37:24.635 An unhandled exception has occurred while executing the request./. (0x80131904): Timeout expired. Please understand this.Ī large number of the following errors were recorded in the log during the failure. I’m very sorry, during 6:37 ~ 8:15 this morning, due to the SQL statement of getting the blog list on the home page of the website, there was a sudden query timeout problem, which caused 500 errors when visiting the home page of the website.
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