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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-functions.html
PS_CURRENT_THREAD_ID() Returns a BIGINT UNSIGNED value representing the Performance Schema thread ID assigned to the current connection. PS_THREAD_ID(connection_id) Given a connection ID, returns a BIGINT UNSIGNED value representing the Performance ... As of MySQL 8.0.16, MySQL includes built-in SQL functions that format or retrieve Performance Schema data, and that may be used as equivalents for the corresponding sys schema stored ...
https://dev.mysql.com/doc/refman/8.0/en/replace.html
REPLACE [LOW_PRIORITY | DELAYED] [INTO] tbl_name [PARTITION (partition_name [, partition_name] ...)] [(col_name [, col_name] ...)] { {VALUES | VALUE} (value_list) [, (value_list)] ... | VALUES row_constructor_list } REPLACE [LOW_PRIORITY | DELAYED] ...
https://dev.mysql.com/doc/refman/8.0/en/spatial-geohash-functions.html
If any SRID argument is not within the range of a 32-bit unsigned integer, an ER_DATA_OUT_OF_RANGE error occurs. Geohash is a system for encoding latitude and longitude coordinates of arbitrary precision into a text string. Geohash values are ...
https://dev.mysql.com/doc/refman/8.0/en/sys-diagnostics.html
Parameters in_max_runtime INT UNSIGNED: The maximum data collection time in seconds. in_interval INT UNSIGNED: The sleep time between data collections in seconds. Creates a report of the current server status for diagnostic purposes. This procedure ...
https://dev.mysql.com/doc/refman/8.0/en/sys-ps-thread-id.html
Parameters in_connection_id BIGINT UNSIGNED: The ID of the connection for which to return the thread ID. Note As of MySQL 8.0.16, ps_thread_id() is deprecated and subject to removal in a future MySQL version. Applications that use it should be ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-auto-increment-columns.html
For example, for a column with a bigint(20) unsigned column type, the data type is just bigint. This view indicates which tables have AUTO_INCREMENT columns and provides information about those columns, such as the current and maximum column values ...
https://dev.mysql.com/doc/refman/8.0/en/alter-table-examples.html
For NDB tables, it is also possible to change the storage type used for a table or column. row *************************** Table: t1 Create Table: CREATE TABLE `t2` ( `c1` int(11) DEFAULT NULL ) /*!50100 TABLESPACE ts_1 STORAGE DISK */ ...
https://dev.mysql.com/doc/refman/8.0/en/audit-log-reference.html
audit_log_flush_interval_seconds Command-Line Format --audit-log-flush-interval-seconds[=value] System Variable audit_log_flush_interval_seconds Scope Global Dynamic No SET_VAR Hint Applies No Type Unsigned Long Default Value 0 Maximum Value ...
https://dev.mysql.com/doc/refman/8.0/en/charset-unicode-sets.html
NOTE 11: The Unicode scalar value of a character is its code point treated as an unsigned integer.” If the character set is ucs2, comparison is byte-by-byte, but ucs2 strings should not contain surrogates, anyway. This section describes the ...
https://dev.mysql.com/doc/refman/8.0/en/choosing-types.html
For example, if an integer column is used for values in the range from 1 to 99999, MEDIUMINT UNSIGNED is the best type. For optimum storage, you should try to use the most precise type in all cases. Of the types that represent all the required ...