多项选择题
A.Finding queries that are not using indexes
B.Finding rows that are locked by InnoDB
C.Finding client connection attributes
D.Finding the part of a code in which a single query is spending time
E.Finding the size of each table
多项选择题 Which three statements are true about memory buffer allocation by a MySQL Server?（）
单项选择题 Consider the following: Which statement best describes the meaning of the value for the key_len column?（）
单项选择题 An employee cannot access the company database. You check the connection variables: What is a valid explanation for why one of the users is unable to connect to the database?（）