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https://dev.mysql.com/doc/refman/8.0/en/charset-conversion.html
To convert a binary or nonbinary string column to use a particular character set, use ALTER TABLE. The following statement accomplishes this: ALTER TABLE t MODIFY col1 CHAR(50) CHARACTER SET utf8mb4; Conversion may be lossy if the column contains ...Suppose that a table t has a binary column named col1 defined as ...For successful conversion to occur, one of the following conditions must apply: If the column has a binary data type (BINARY, VARBINARY, BLOB), all the values that it contains must be encoded using a ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-columns-extensions-table.html
The COLUMNS_EXTENSIONS table (available as of MySQL 8.0.21) provides information about column attributes defined for primary and secondary storage engines. The COLUMNS_EXTENSIONS table has these columns: TABLE_CATALOG The name of the catalog to ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-connection-control-table-reference.html
Table 28.8 INFORMATION_SCHEMA Connection Control Tables Table Name Description CONNECTION_CONTROL_FAILED_LOGIN_ATTEMPTS Current number of consecutive failed connection attempts per account .
https://dev.mysql.com/doc/refman/8.0/en/information-schema-firewall-table-reference.html
Table 28.9 INFORMATION_SCHEMA Firewall Tables Table Name Description Deprecated MYSQL_FIREWALL_USERS Firewall in-memory data for account profiles Yes MYSQL_FIREWALL_WHITELIST Firewall in-memory data for account profile allowlists Yes .
https://dev.mysql.com/doc/refman/8.0/en/information-schema-ndb-transid-mysql-connection-map-table.html
The ndb_transid_mysql_connection_map table provides a mapping between NDB transactions, NDB transaction coordinators, and MySQL Servers attached to an NDB Cluster as API nodes. This information is used when populating the server_operations and ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-thread-pool-table-reference.html
Table 28.7 INFORMATION_SCHEMA Thread Pool Tables Table Name Description TP_THREAD_GROUP_STATE Thread pool thread group states TP_THREAD_GROUP_STATS Thread pool thread group statistics TP_THREAD_STATE Thread pool thread information .
https://dev.mysql.com/doc/refman/8.0/en/mysql-shell-tutorial-javascript-documents-in-tables.html
In MySQL, a table may contain traditional relational data, JSON values, or both. Examples in this section use the city table in the world_x schema. city Table Description The city table has five columns (or fields). You can combine traditional data ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-shell-tutorial-python-documents-in-tables.html
In MySQL, a table may contain traditional relational data, JSON values, or both. Examples in this section use the city table in the world_x schema. city Table Description The city table has five columns (or fields). You can combine traditional data ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-shell-tutorial-python-table-insert.html
You can use the insert() method with the values() method to insert records into an existing relational table. The insert() method accepts individual columns or all columns in the table. Insert a Complete Record To insert a complete record, pass to ...Use one or more values() methods to specify the values to be ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-innodb-many-tables.html
If you have configured non-persistent optimizer statistics (a non-default configuration), InnoDB computes index cardinality values for a table the first time that table is accessed after startup, instead of storing such values in the table. This ...