在执行命令 mysql_upgrade -u root -p --force 时遇到 cannot select database 错误，这通常意味着MySQL服务未能正确启动，或MySQL用户权限存在问题。该错误提示表明在尝试选择数据库时发生了问题。在MySQL中，mysql 用户用于执行数据库管理任务，如升级数据库。当我们使用 mysql -u root -p 登录时，系...
navicat连接本地MySQL时出现Table ‘performance_schema.session_variables’ doesn’t exist报错。网上的解决方法是在mysql的bin目录下运行 mysql_upgrade -u root -p --force命令,但是我在输入这个命令之后出现了Error occurred: Cannot select database.报错。 解决方案: 在mysql文件夹下的my.ini中添加 [mysqld]sh...
如果你是访问网站之类的出现这个问题，那你就没办法处理了，这是服务器代码出了问题
ER_CANNOT_ADD_FOREIGN 1215 HY000 ER_NO_REFERENCED_ROW 1216 23000 ER_ROW_IS_REFERENCED 1217 23000 ER_CONNECT_TO_MASTER 1218 08S01 ER_QUERY_ON_MASTER 1219 HY000 ER_ERROR_WHEN_EXECUTING_COMMAND 1220 HY000 ER_WRONG_USAGE 1221 HY000 ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT 1222 21000 ER_CANT_UPDAT...
然后在数据库编辑工具Navicat for MySQL打开后,进行了一个小小的数据库查询:select * from...user;回车之后发现报错:[Err] 1146 – Table ‘performance_schema.session_status’ doesn’t exist 数据库报错 之后通过百度一些博客...但是也会出现这样的情况:②直接报错:Error occurred: Cannot select database.,...
SELECT VERSION()查看数据库当前版本 0.2 MYSQL ERROR CODE 错误编号(合集) 0.3 SQLSTATE[HY000]:执行查询后出现常规错误 SQLSTATE[HY000]是一种SQL语句执行错误的状态码,表示在执行查询时发生了常规错误。 该错误码是由SQL标准定义的,不仅适用于特定的数据库系统,也适用于各种关系型数据库。
// 1. Create a database connection $connection = mysql_connect(DB_SERVER,DB_USER,DB_PASS); if (!$connection) { die("Database connection failed: " . mysql_error()); } // 2. Select a database to use $db_select = mysql_select_db(DB_NAME,$connection); ...
mysql sys database can't select data when use utf8mb4_general_ci,I found that changing the collation rules of sys can solve the problem. Can I rebuild the collation rules of the sys database? What would be the impact if I did this? eg: 1、 $ mysqldump --user=root --default-chara...
Bug #113016 sys database can't select when use utf8mb4_general_ci Submitted: 9 Nov 2023 6:22Modified: 9 Nov 2023 11:49 Reporter: chong zhang Email Updates: Status: Duplicate Impact on me: None Category: MySQL Server: SYS SchemaSeverity: S1 (Critical) Version: 8.0.25OS: Any ...
InnoDB: The error means the system cannot find the path specified. 2015-07-21 01:52:50 4268 [ERROR] InnoDB: Could not find a valid tablespace file for 'test/t5'. See http:// /doc/refman/5.6/en/innodb-troubleshooting-datadict.html for how to resolve the issue. ...