Which two statements are true about the mysql_upgrade command?
A the mysql_upgrade command executes on a stopped MYSQL server data directory to ensure that it is prepare for upgrade.
B the mysql_upgrade command is a utility that patches mysqld binary from its base version to a new version
C the mysql_upgrade command also execute the mysqlcheck command in order to provide all of its functionality.
D the sql_upgrade command is run to check and attempt to fix tables for certain incompatibilities with the current version of MYSQL
答案：
C the mysql_upgrade command also execute the mysqlcheck command in order to provide all of its functionality.
D the sql_upgrade command is run to check and attempt to fix tables for certain incompatibilities with the current version of MYSQL
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