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https://dev.mysql.com/doc/mysql-errors/9.7/en/error-reference-introduction.html
The MySQL server writes some error messages to its error log. The MySQL client library takes errors received from the server and makes them available to the host client program. Error messages that originate only from within the MySQL client ...
https://dev.mysql.com/doc/internals/en/error-messages-old-versions.html
In practice, no new error messages should be added to error message files for versions of MySQL prior to 5.0.3. Doing so and merging the messages upward would cause error numbers to change in more recent versions. Before MySQL 5.0.3, error messages ...The files have names like czech/errmsg.txt, danish/errmsg.txt, and so forth, and each one is ...
https://dev.mysql.com/doc/refman/9.7/en/error-message-language.html
By default, mysqld produces error messages in English, but they can be displayed instead in any of several other languages: Czech, Danish, Dutch, Estonian, French, German, Greek, Hungarian, Italian, Japanese, Korean, Norwegian, Norwegian-ny, ...By ...
https://dev.mysql.com/doc/refman/9.7/en/mysql-cluster-ndb-transporter-errors.html
This section lists error codes, names, and messages that are written to the cluster log in the event of transporter errors. 0x00 TE_NO_ERROR No error 0x01 TE_ERROR_CLOSING_SOCKET Error found during closing of socket 0x02 ...
https://dev.mysql.com/doc/internals/en/error-flags.html
The following flags can be examined or set to alter the behavior during error handling: thd->net.report_error thd->net.report_error is set in my_message_sql() if the error message was registered. thd->query_error Like net.report_error, but is ...
https://dev.mysql.com/doc/internals/en/error-message-multiple-versions.html
It is critical that error codes are identical in all versions. That is, the value of ER_SOME_ERROR must be the same in all versions for which it is defined. To add a new error message in multiple versions, first add the specific error message to ...
https://dev.mysql.com/doc/refman/9.7/en/error-log.html
This section discusses how to configure the MySQL server for logging of diagnostic messages to the error log. For information about selecting the error message character set and language, see Section 12.6, “Error Message Character Set”, and ...
https://dev.mysql.com/doc/refman/9.7/en/show-errors.html
SHOW ERRORS [LIMIT [offset,] row_count] SHOW COUNT(*) ERRORS SHOW ERRORS is a diagnostic statement that is similar to SHOW WARNINGS, except that it displays information only for errors, rather than for errors, warnings, and notes. You can also ...
https://dev.mysql.com/doc/refman/9.7/en/subquery-errors.html
Incorrect number of rows from subquery: ERROR 1242 (ER_SUBSELECT_NO_1_ROW) SQLSTATE = 21000 Message = "Subquery returns more than 1 row" This error occurs for statements where the subquery must return at most one row but returns multiple rows. If ...
https://dev.mysql.com/doc/refman/9.7/en/error-log-rotation.html
If you flush the error log using a FLUSH ERROR LOGS or FLUSH LOGS statement, or a mysqladmin flush-logs command, the server closes and reopens any error log file to which it is writing. To rename an error log file, do so manually before flushing.