问题分析，首先确认表是存在的，但是无法读取。可以判定是 lower_case_table_names=1 选项的问题，开启后表以小写方式打开。

		
Error Code: 1146. Table 'test.CACHE_UPDATE' doesn't exist		
		
		

如果是 MySQL 8.0 之前没有开启 lower_case_table_names=1 ，现在需要开启，加入配置后将无法启动，解决办法是，你需要重做 mysql data 目录

		
[root@localhost ~]# rm -rf /var/lib/mysql/*
[root@localhost ~]# systemctl restart mysqld
[root@localhost ~]# mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.21 Source distribution

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Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show variables like '%lower_case_table_names%';
+------------------------+-------+
| Variable_name          | Value |
+------------------------+-------+
| lower_case_table_names | 1     |
+------------------------+-------+
1 row in set (0.01 sec)

mysql> SELECT CURRENT_SERIAL FROM CACHE_UPDATE WHERE ID=1;
+----------------+
| CURRENT_SERIAL |
+----------------+
|              7 |
+----------------+
1 row in set (0.00 sec)