You want to start monitoring statistics on the distribution of storage engines that are being used and the average sizes of tables in the various databases. Some details are as follows: The Mysql instance has 400 databases. Each database on an average consists of 25-50 tables. You use the query: SELECT TABLE_SCHEMA, 'ENGINE', COUNT (*), SUM(data_length) total_size FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE= 'BASE TABLE' GROUP BY TABLE_SCHEMA, 'ENGINE' ; Why is this query slow to execute?（）

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[单选题]You want to start monitoring statistics on the distribution of storage engines t...

[多选题]What are two types of WebView monitoring statistics on the WX/WXC platforms?（） (...

[单选题]When does the E-series router start monitoring DHCP traffic using the DHCP Exter...

[多选题]Which three statistics are available when viewing the Cluster statistics page?（）...

[单选题]

[单选题]Which of these is not used as a monitoring tool？（）

[多选题]area statistics tool按钮的作用是（）

[多选题]When you try to start the Database Control by using the emctl start dbconsole co...

[多选题]When you try to start the Database Control by using the emctl start dbconsole co...

[单选题]12. void start（） {  13. A a = new A（）；  14. B b = new B（）；  15. a.s（b）；  16. b =...