我有一个 MySQL 5.7 实例在 Ubuntu 16 上运行没有问题，但是当我尝试安装任何其他包或尝试通过 apt-get 更新现有包时，我收到以下错误:

# apt-get upgrade

Setting up mysql-server-5.7 (5.7.20-0ubuntu0.16.04.1) ...
Checking if update is needed.
Checking server version.
Running queries to upgrade MySQL server.
mysql_upgrade: [ERROR] 1146: Table 'mysql.plugin' doesn't exist
mysql_upgrade failed with exit status 5
 dpkg: error processing package mysql-server-5.7 (--configure):
  subprocess installed post-installation script returned error exit status 1
No apport report written because the error message indicates its a followup error from a previous failure.
dpkg: dependency problems prevent configuration of mysql-server:
mysql-server depends on mysql-server-5.7; however:
Package mysql-server-5.7 is not configured yet.

dpkg: error processing package mysql-server (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 mysql-server-5.7
 mysql-server

如果我运行 mysqlcheck，它看起来有些系统表存在但其他的丢失了:

mysql.columns_priv                                 OK
mysql.db                                           OK
mysql.engine_cost
Error    : Table 'mysql.engine_cost' doesn't exist
status   : Operation failed
mysql.event                                        OK
mysql.func                                         OK
mysql.general_log                                  OK
mysql.gtid_executed
Error    : Table 'mysql.gtid_executed' doesn't exist
status   : Operation failed
mysql.help_category
Error    : Table 'mysql.help_category' doesn't exist
status   : Operation failed
mysql.help_keyword
Error    : Table 'mysql.help_keyword' doesn't exist
status   : Operation failed
mysql.help_relation
Error    : Table 'mysql.help_relation' doesn't exist
status   : Operation failed
mysql.help_topic
Error    : Table 'mysql.help_topic' doesn't exist
status   : Operation failed
mysql.innodb_index_stats
Error    : Table 'mysql.innodb_index_stats' doesn't exist
status   : Operation failed
mysql.innodb_table_stats
Error    : Table 'mysql.innodb_table_stats' doesn't exist
status   : Operation failed
mysql.ndb_binlog_index                             OK
mysql.plugin
Error    : Table 'mysql.plugin' doesn't exist
status   : Operation failed
mysql.proc                                         OK
mysql.procs_priv                                   OK
mysql.proxies_priv                                 OK
mysql.server_cost
Error    : Table 'mysql.server_cost' doesn't exist
status   : Operation failed
mysql.servers
Error    : Table 'mysql.servers' doesn't exist
status   : Operation failed
mysql.slave_master_info
Error    : Table 'mysql.slave_master_info' doesn't exist
status   : Operation failed
mysql.slave_relay_log_info
Error    : Table 'mysql.slave_relay_log_info' doesn't exist
status   : Operation failed
mysql.slave_worker_info
Error    : Table 'mysql.slave_worker_info' doesn't exist
status   : Operation failed
mysql.slow_log                                     OK
mysql.tables_priv                                  OK
mysql.time_zone
Error    : Table 'mysql.time_zone' doesn't exist
status   : Operation failed
mysql.time_zone_leap_second
Error    : Table 'mysql.time_zone_leap_second' doesn't exist
status   : Operation failed
mysql.time_zone_name
Error    : Table 'mysql.time_zone_name' doesn't exist
status   : Operation failed
mysql.time_zone_transition
Error    : Table 'mysql.time_zone_transition' doesn't exist
status   : Operation failed
mysql.time_zone_transition_type
Error    : Table 'mysql.time_zone_transition_type' doesn't exist
status   : Operation failed
mysql.user                                         OK
sys.sys_config
Error    : Table 'sys.sys_config' doesn't exist
status   : Operation failed

但是，数据库运行正常，如果我通过 SQL 手动检查，看起来表存在。

mysql> SHOW TABLES;
+---------------------------+
| Tables_in_mysql           |
+---------------------------+
| columns_priv              |
| db                        |
| engine_cost               |
| event                     |
| func                      |
| general_log               |
| gtid_executed             |
| help_category             |
| help_keyword              |
| help_relation             |
| help_topic                |
| innodb_index_stats        |
| innodb_table_stats        |
| ndb_binlog_index          |
| plugin                    |
| proc                      |
| procs_priv                |
| proxies_priv              |
| server_cost               |
| servers                   |
| slave_master_info         |
| slave_relay_log_info      |
| slave_worker_info         |
| slow_log                  |
| tables_priv               |
| time_zone                 |
| time_zone_leap_second     |
| time_zone_name            |
| time_zone_transition      |
| time_zone_transition_type |
| user                      |
+---------------------------+

我使用了 innodb_file_per_table=1 设置，/var/lib/mysql 目录的所有者被正确设置为 mysql 用户。

我想在不转储现有数据的情况下解决这个问题，但我的想法已经用完了。

最佳答案

我今天遇到了同样的问题，我设法在没有备份 - 重新安装 - 恢复步骤的情况下解决了它。 (虽然我有备份，每个人都应该!)

在我的例子中，/var/lib/mysql/mysql/ 目录中有一个 plugin.ibd 文件，其他丢失的表也有文件，但也许由于某种原因它们不完整。

我做了以下事情:

1. 将 mysql.plugin 表的文件移动到另一个目录，例如:mv/var/lib/mysql/mysql/plugin.*/other/place/
2. 运行 apt-get upgrade -y 看看会发生什么。升级脚本正确地重新创建了 mysql.plugin 表并提示另一个表。
3. 我使用升级脚本告诉我的表名重复上述步骤，以这种方式重新创建 19 个表后，升级成功完成。

我做的所有步骤，当然是作为 root:

cd /var/lib/mysql/mysql
mkdir temp
mv engine_cost.*               temp/
mv gtid_executed.*             temp/
mv help_category.*             temp/
mv help_keyword.*              temp/
mv help_relation.*             temp/
mv help_topic.*                temp/
mv innodb_index_stats.*        temp/
mv innodb_table_stats.*        temp/
mv plugin.*                    temp/
mv server_cost.*               temp/
mv servers.*                   temp/
mv slave_master_info.*         temp/
mv slave_relay_log_info.*      temp/
mv slave_worker_info.*         temp/
mv time_zone.*                 temp/
mv time_zone_leap_second.*     temp/
mv time_zone_name.*            temp/
mv time_zone_transition.*      temp/
mv time_zone_transition_type.* temp/
apt-get upgrade -y

希望对大家有帮助。

关于mysql - 错误设置 MySQL : Table 'mysql.plugin' doesn't exist，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/47075429/