问题描述：
[多选]
Which three statements are characteristic of the MEMORY storage engine？哪三条语句是内存存储引擎的特征？（）
A．Each table is represented on disk as an .frm file. 每个表在磁盘上以.frm文件表示。
B．Each table has a corresponding .MYI and .MYD file. (MSM 引擎)
C．It can support foreign keys.
D．It cannot contain text or BLOB columns. 它不能包含text或BLOB列。
E．Table contents are not saved if the server is restarted. 如果重新启动服务器，则不会保存表内容。
F．It can support transactions.(INNODB，NDB)
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上一篇：Consider the MySQL Enterprise Audit plugin．考虑一下MySQL企业审计插件。Which statement is true when you identify a connection event that has used external authentication？当您标识已使用外部身份验证的连接事件时，哪个语句是正确的？
下一篇：Consider the query( )考虑一下这个问题( )This query is run several times in an application with different values in the WHERE clause in a growing data set．此查询在一个应用程序中多次运行，其中WHERE子句中的值在不断增长的数据集中。What is the primary improvement that can be made for this scenario？对于这种情况，可以做的主要改进是什么？
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