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https://dev.mysql.com/doc/refman/8.0/en/controlling-query-plan-evaluation.html
The task of the query optimizer is to find an optimal plan for executing an SQL query. Because the difference in performance between “good” and “bad” plans can be orders of magnitude (that is, seconds versus hours or even days), most query ...
https://dev.mysql.com/doc/refman/8.0/en/create-index.html
CREATE [UNIQUE | FULLTEXT | SPATIAL] INDEX index_name [index_type] ON tbl_name (key_part,...) [index_option] [algorithm_option | lock_option] ... This guideline is especially important for InnoDB tables, where the primary key determines the ...
https://dev.mysql.com/doc/refman/8.0/en/create-table-gipks.html
Beginning with MySQL 8.0.30, MySQL supports generated invisible primary keys for any InnoDB table that is created without an explicit primary key. When the sql_generate_invisible_primary_key server system variable is set to ON, the MySQL server ...
https://dev.mysql.com/doc/refman/8.0/en/data-dictionary-information-schema.html
In particular, for each INFORMATION_SCHEMA table that is a view on data dictionary tables: The server no longer must create a temporary table for each query of the INFORMATION_SCHEMA table. When the underlying data dictionary tables store values ...
https://dev.mysql.com/doc/refman/8.0/en/data-dictionary-usage-differences.html
Use of a data dictionary-enabled MySQL server entails some operational differences compared to a server that does not have a data dictionary: Previously, enabling the innodb_read_only system variable prevented creating and dropping tables only for ...
https://dev.mysql.com/doc/refman/8.0/en/data-masking-component-functions.html
mask_canada_sin(str [, mask_char]) Masks a Canada Social Insurance Number (SIN) and returns the number with all meaningful digits replaced by 'X' characters. Nine digits grouped in pattern: xxx-xxx-xxx ('-' is any separator character). Return value: ...
https://dev.mysql.com/doc/refman/8.0/en/data-masking-plugin-usage.html
Before using MySQL Enterprise Data Masking and De-Identification, install it according to the instructions provided at Section 8.5.3.1, “MySQL Enterprise Data Masking and De-Identification Plugin Installation”. To use MySQL Enterprise Data ...
https://dev.mysql.com/doc/refman/8.0/en/data-masking.html
Note MySQL Enterprise Data Masking and De-Identification is an extension included in MySQL Enterprise Edition, a commercial product. MySQL Enterprise Edition provides data masking and de-identification capabilities: Transformation of existing data ...
https://dev.mysql.com/doc/refman/8.0/en/data-type-defaults.html
Data type specifications can have explicit or implicit default values. A DEFAULT value clause in a data type specification explicitly indicates a default value for a column. Examples: CREATE TABLE t1 ( i INT DEFAULT -1, c VARCHAR(10) DEFAULT '', ...
https://dev.mysql.com/doc/refman/8.0/en/declare-handler.html
statement handler_action: { CONTINUE | EXIT | UNDO } condition_value: { mysql_error_code | SQLSTATE [VALUE] sqlstate_value | condition_name | SQLWARNING | NOT FOUND | SQLEXCEPTION } The DECLARE ... HANDLER statement specifies a handler that deals ...