環(huán)境說(shuō)明：

MySQL5.6.40 上xtrabackup全備備份的數(shù)據(jù)導(dǎo)入到mysql5.7.24實(shí)例上，啟動(dòng)MySQL5.7的服務(wù)，登錄數(shù)據(jù)庫(kù)MySQL5.7實(shí)例。但是在drop user

[email?protected]‘127.0.0.1‘時(shí)，報(bào)錯(cuò)如下：

2019-08-15T19:02:31.160910+08:00 1546 [ERROR] /usr/local/mysql5.7/bin/mysqld: Column count of mysql.user is wrong. Expected 45, found 43. Created with MySQL 50640, now running 50724. Please use mysql_upgrade to fix this error.

mysql實(shí)例版本如下：

[[email?protected] ~]# /usr/local/mysql/bin/mysqld -V

/usr/local/mysql/bin/mysqld Ver 5.6.40 for Linux on x86_64 (Source distribution)

[[email?protected] ~]# /usr/local/mysql5.7/bin/mysqld -V

/usr/local/mysql5.7/bin/mysqld Ver 5.7.24 for linux-glibc2.12 on x86_64 (MySQL Community Server (GPL))

解決辦法：升級(jí)下MySQL5.7

/usr/local/mysql5.7/bin/mysql_upgrade -uroot -p‘ln.orge#dieurw5199‘ -S /tmp/3306.sock

Checking if update is needed.

Checking server version.

Running queries to upgrade MySQL server.

Checking system database.

testdb29.dtr_wx_gotourl OK

testdb29.dtr_zone OK

testdb29.hm_planstats_h OK

Upgrade process completed successfully.

Checking if update is needed.

登錄MySQL5.7刪除庫(kù)的用戶，刪除成功

mysql> drop user [email?protected]‘127.0.0.1‘;

Query OK, 0 rows affected (0.00 sec)

提示：此時(shí)的mysql5.7.24實(shí)例并沒有重啟

此刻創(chuàng)建一個(gè)定時(shí)器調(diào)用存儲(chǔ)過程時(shí)，報(bào)錯(cuò)如下：

mysql> CREATE EVENT test1

-> ON SCHEDULE EVERY 2 second STARTS TIMESTAMP ‘2019-08-10 16:16:22‘

-> ON COMPLETION PRESERVE

-> DO

-> BEGIN

-> CALL test1();

-> END//

ERROR 1577 (HY000): Cannot proceed because system tables used by Event Scheduler were found damaged at server start

mysql> show events;

ERROR 1577 (HY000): Cannot proceed because system tables used by Event Scheduler were found damaged at server start

###提示無(wú)法繼續(xù)，因?yàn)樵诜?wù)器啟動(dòng)時(shí)發(fā)現(xiàn)事件調(diào)度程序使用的系統(tǒng)表已損壞

此刻查看mysql 系統(tǒng)變量報(bào)錯(cuò)如下：

mysql> show variables like ‘event_scheduler‘;

ERROR 1682 (HY000): Native table ‘performance_schema‘.‘session_variables‘ has the wrong structure

出現(xiàn)的原因是我升級(jí)了mysql的版本，但是沒有重啟mysql實(shí)例

需要重啟MySQL5.7.24服務(wù)。否則會(huì)導(dǎo)致MySQL的部分系統(tǒng)表識(shí)別不到。

service restart mysql5.7.24

到此處問題解決了

mysql> show events;

Empty set (0.00 sec)

mysql> show variables like ‘event_scheduler‘;

+-----------------+-------+

| Variable_name | Value |

+-----------------+-------+

| event_scheduler | ON |

+-----------------+-------+

1 row in set (0.01 sec)

從新創(chuàng)建定時(shí)器，執(zhí)行成功：

mysql> CREATE PROCEDURE test1()

-> BEGIN

-> INSERT INTO tb01(username,password,create_time) values(‘李四‘, ‘張三‘,now());

-> END//

Query OK, 0 rows affected (0.01 sec)

mysql> CREATE EVENT test1

-> ON SCHEDULE EVERY 5 second STARTS TIMESTAMP ‘2019-08-16 17:34:22‘

-> ON COMPLETION PRESERVE

-> DO

-> BEGIN

-> CALL test1();

-> END//

Query OK, 0 rows affected (0.00 sec)

mysql> delimiter ;

mysql> select now();

總結(jié)

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