单项选择题

What is true regarding InnoDB locking?（）

A.InnoDB uses row and table-level locks, but row locks are not escalates
B.InnoDB locks only those rows that are updated
C.InnoDB only uses row locks, not page or table-level locks
D.InnoDB row locks may be escalated to page or table-level locks
E.InnoDB uses row-level or table-level locks depending on the number of rows affected

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单项选择题

Which statement is true about the log-output variable?（）

A.It is a static variable and can be set only at MySQL server startup
B.It enables and starts the General Query Log
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C.Decrease the value of table_open_cache_instances
D.Increase the value of table_open_cache
E.Decrease the value of table_definition_cache
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多项选择题

Which two statements are true about setting the per-thread buffers higher than required?（）

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