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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?（）

A.Collecting information requires large numbers of locks on various INFORMATION_SCHEMA tables

B.Aggregating details from various storage engine caches for the final output is time consuming

C.Collecting information requires various disk-level operations and is time consuming

D.Counting and summarizing all table pages in the InnoDB shared tablespace is time consuming

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更多 “ 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?（）A.Collecting information requires large numbers of locks on various INFORMATION_SCHEMA tablesB.Aggregating details from various storage engine caches for the final output is time consumingC.Collecting information requires various disk-level operations and is time consumingD.Counting and summarizing all table pages in the InnoDB shared tablespace is time consuming ” 相关考题
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