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https://dev.mysql.com/doc/refman/8.4/en/information-schema-files-table.html
The value is NULL for all data files except for predefined system tablespace data files. A NULL value for a predefined system tablespace data file indicates that a file size limit was not defined explicitly. For NDB: For undo log files, this column ... The FILES table provides information about the files in which MySQL tablespace data is ...
https://dev.mysql.com/doc/refman/8.4/en/audit-log-file-formats.html
The MySQL server calls the audit log plugin to write an audit record to its log file whenever an auditable event occurs. Typically the first audit record written after plugin startup contains the server description and startup options. Elements ...
https://dev.mysql.com/doc/c-api/8.4/en/c-api-data-structures.html
(You cannot treat these as null-terminated strings if field values may contain binary data, because such values may contain null bytes internally.) Rows are obtained by calling mysql_fetch_row(). char * name The name of the field, as a ... This ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-information-schema-metrics-table.html
Because no DML operations have been performed, the counter values are zero or NULL. row *************************** NAME: dml_inserts SUBSYSTEM: dml COUNT: 0 MAX_COUNT: 0 MIN_COUNT: NULL AVG_COUNT: 0 COUNT_RESET: 0 MAX_COUNT_RESET: 0 ... The ...
https://dev.mysql.com/doc/mysql-enterprise-backup/8.4/en/trouble.logging.html
Because the backup_history table used to be in the CSV format, which cannot register NULL values directly, if binary logging is not enabled, a value of -1 is entered into the column; the same applies to other columns for the logging of NULL values.
https://dev.mysql.com/doc/refman/8.4/en/explain.html
In practice, the DESCRIBE keyword is more often used to obtain information about table structure, whereas EXPLAIN is used to obtain a query execution plan (that is, an explanation of how MySQL would execute a query). The following discussion uses ...
https://dev.mysql.com/doc/refman/8.4/en/group-replication-system-variables.html
group_replication_preemptive_garbage_collection Command-Line Format --group-replication-preemptive-garbage-collection[=ON|OFF] System Variable group_replication_preemptive_garbage_collection Scope Global Dynamic Yes SET_VAR Hint Applies No Type ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-replication-schema.html
Note When performing schema changes on NDB tables, applications should wait until the ALTER TABLE statement has returned in the MySQL client connection that issued the statement before attempting to use the updated definition of the table.
https://dev.mysql.com/doc/refman/8.4/en/sql-mode.html
If this mode is not enabled, division by zero inserts NULL and produces no warning. If this mode is enabled, division by zero inserts NULL and produces a warning. For INSERT IGNORE and UPDATE IGNORE, division by zero inserts NULL and produces a ...
https://dev.mysql.com/doc/refman/8.4/en/enum.html
Creating and Using ENUM Columns Index Values for Enumeration Literals Handling of Enumeration Literals Empty or NULL Enumeration Values Enumeration Sorting Enumeration Limitations Creating and Using ENUM Columns An enumeration value must be a quoted ... An ENUM is a string object with a value chosen from a list of permitted values that are enumerated explicitly in the column specification at table creation ...