数据库由于物理关机，启动不了，试了好多方法，最后选择备份整个目录，重装数据库。重装以后，移动以前的数据库data目录到新安装的数据库下面。启动成功。交给测试后，测试说select报错。
mysql> select * from qwe.merchant;
[Err] 1146 - Table 'performance_schema.session_status' doesn't exist
[root@d-db classes]# mysql_upgrade -u root -p --force
Enter password:
Checking server version.
Running queries to upgrade MySQL server.
Checking system database.
mysql.columns_priv OK
mysql.db OK
mysql.engine_cost OK
mysql.event OK
mysql.func OK
mysql.general_log OK
mysql.gtid_executed OK
mysql.help_category OK
mysql.help_keyword OK
mysql.help_relation OK
mysql.help_topic OK
mysql.innodb_index_stats OK
mysql.innodb_table_stats OK
mysql.ndb_binlog_index OK
mysql.plugin OK
mysql.proc OK
mysql.procs_priv OK
mysql.proxies_priv OK
mysql.server_cost OK
mysql.servers OK
mysql.slave_master_info OK
mysql.slave_relay_log_info OK
mysql.slave_worker_info OK
mysql.slow_log OK
mysql.tables_priv OK
mysql.time_zone OK
mysql.time_zone_leap_second OK
mysql.time_zone_name OK
mysql.time_zone_transition OK
mysql.time_zone_transition_type OK
mysql.user OK
The sys schema is already up to date (version 1.5.1).
Checking databases.
Error occurred: Error during call to mysql_check.
##注意：Error occurred: Error during call to mysql_check.报错。
之后重启数据库，等待测试测试新问题。
