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https://dev.mysql.com/doc/refman/8.0/en/server-options.html
If no errors are found, the server terminates with an exit code of 0. If an error is found, the server displays a diagnostic message and terminates with an exit code of 1. Warning and information messages may also be displayed, depending on the ...
https://dev.mysql.com/doc/refman/8.0/en/using-log-files.html
If you find the text mysqld restarted in the error log (normally a file named host_name.err) you probably have found a query that causes mysqld to fail. If you get a lot of these errors, without mysqld having died unexpectedly just before, then ...
https://dev.mysql.com/doc/refman/8.0/en/error-creating-innodb.html
Runtime Problems If InnoDB prints an operating system error during a file operation, usually the problem has one of the following solutions: Make sure the InnoDB data file directory and the InnoDB log directory exist. In particular, any MAX value in ... The troubleshooting steps for InnoDB I/O problems depend on when the problem occurs: during startup of the MySQL server, or during normal operations when a DML or DDL statement fails due to problems at the file system ...
https://dev.mysql.com/doc/refman/8.0/en/signal.html
At the SQL level, the output from SHOW WARNINGS and SHOW ERRORS indicates the MYSQL_ERRNO and MESSAGE_TEXT values in the Code and Message columns. SIGNAL provides error information to a handler, to an outer portion of the application, or to the ...
https://dev.mysql.com/doc/refman/8.0/en/error-access-denied.html
Often the problem is related to the MySQL accounts that the server permits client programs to use when connecting. See Section 8.2, “Access Control and Account Management”, and Section 8.2.22, “Troubleshooting Problems Connecting to MySQL”.
https://dev.mysql.com/doc/refman/8.0/en/problems.html
This section lists some common problems and error messages that you may encounter. It describes how to determine the causes of the problems and what to do to solve them.
https://dev.mysql.com/doc/refman/8.0/en/mysql-nutshell.html
The following server error codes are not used and have been removed. Now, each statement is transactional and either succeeds for all named users or rolls back and has no effect if any error occurs. If ALGORITHM=INSTANT is specified but not ... This ...
https://dev.mysql.com/doc/refman/8.0/en/mysqld-safe.html
mysqld_safe adds some safety features such as restarting the server when an error occurs and logging runtime information to an error log. A description of error logging is given later in this section. For example, if you specify a [mysqld] section ... mysqld_safe is the recommended way to start a mysqld server on ...
https://dev.mysql.com/doc/refman/8.0/en/cast-functions.html
If p < 0 or p > 53, an error is returned. If the spatial type combination is permitted but the expression to cast is not a syntactically well-formed geometry, an ER_GIS_INVALID_DATA error occurs. If the spatial type combination is permitted but the ... Table 14.15 Cast Functions and Operators Name Description Deprecated BINARY Cast a string to a binary string 8.0.27 CAST() Cast a value as a certain type CONVERT() Cast a value as a certain type Cast functions and operators enable conversion of values from one data type to ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbd-definition.html
If the checkpointing is slow and there are so many writes to the database that the log files are full and the log tail cannot be cut without jeopardizing recovery, all updating transactions are aborted with internal error code 410 (Out of log file ...(NDB 8.0.13) This parameter specifies the directory where trace files, log files, pid files and error logs are ...