单项选择题
A.Increase the value of table_definition_cache
B.Increase the value of table_open_cache_instances
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
F.Decrease the value of table_open_cache
多项选择题 Which two statements are true about setting the per-thread buffers higher than required?（）
多项选择题 In a test database, you issue the SELECT … INTO OUTFILE statement to create a file with your t1 table data. You then TRUNCATE this table to empty it.（） Mysql＞ SELECT * INTO OUTFILE /tmp/t1.sql from t1; mysql＞ TRUNCATE t1;
多项选择题 What are three facts about backups with mysqldump?（）