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https://dev.mysql.com/doc/refman/9.7/en/innodb-enabling-monitors.html
InnoDB monitor output begins with a header containing a timestamp and the monitor name. When InnoDB monitors are enabled for periodic output, InnoDB writes the output to mysqld server standard error output (stderr) every 15 seconds, approximately.
https://dev.mysql.com/doc/refman/9.7/en/innodb-online-ddl-limitations.html
Tables created before MySQL 5.6 that include temporal columns (DATE, DATETIME or TIMESTAMP) and have not been rebuilt using ALGORITHM=COPY do not support ALGORITHM=INPLACE. The following limitations apply to online DDL operations: The table is ...
https://dev.mysql.com/doc/refman/9.7/en/innodb-standard-monitor.html
Status This section shows the timestamp, the monitor name, and the number of seconds that per-second averages are based on. The Lock Monitor is the same as the Standard Monitor except that it includes additional lock information. Enabling either ...
https://dev.mysql.com/doc/refman/9.7/en/innodb-troubleshooting-datadict.html
Information about table definitions is stored in the InnoDB data dictionary. If you move data files around, dictionary data can become inconsistent. If a data dictionary corruption or consistency issue prevents you from starting InnoDB, see Section ...
https://dev.mysql.com/doc/refman/9.7/en/json-attribute-functions.html
The functions in this section return attributes of JSON values. An error occurs if the argument is not a valid JSON document. An empty array, empty object, or scalar value has depth 1. A nonempty array containing only elements of depth 1 or ...
https://dev.mysql.com/doc/refman/9.7/en/json.html
If two values originally come from the MySQL DATETIME and TIMESTAMP types, respectively, they are equal if they represent the same point in time. The JSON data type provides these advantages over storing JSON-format strings in a string column: ...
https://dev.mysql.com/doc/refman/9.7/en/keywords.html
Certain keywords, such as SELECT, DELETE, or BIGINT, are reserved and require special treatment for use as identifiers such as table and column names. This may also be true for the names of built-in functions. Some keywords which are otherwise ...
https://dev.mysql.com/doc/refman/9.7/en/mysql-cluster-replication-schema.html
This works for these algorithms since they both map a WRITE_ROW event to an insert or update depending on whether the row already exists, and the required metadata (the “after” image for the timestamp column) is present in the “WRITE_ROW” ...
https://dev.mysql.com/doc/refman/9.7/en/partitioning-limitations-functions.html
This section discusses limitations in MySQL Partitioning relating specifically to functions used in partitioning expressions. Each of these functions returns an integer only if it is passed an argument of an exact numeric type, such as one of the ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-error-summary-tables.html
FIRST_SEEN, LAST_SEEN Timestamp indicating when the error was first seen and most recently seen. The Performance Schema maintains summary tables for aggregating statistical information about server errors (and warnings). For a list of server ...