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https://dev.mysql.com/doc/refman/8.0/en/invisible-columns.html
To update invisible columns for UPDATE statements, name them and assign a value, just as for visible columns. As an illustration of when invisible columns may be useful, suppose that an application uses SELECT * queries to access a table, and must ...An invisible column is normally hidden to queries, but can be accessed if explicitly ...
https://dev.mysql.com/doc/refman/8.0/en/identifier-case-sensitivity.html
Each table within a database corresponds to at least one file within the database directory (and possibly more, depending on the storage engine). Consequently, the case sensitivity of the underlying operating system plays a part in the case ... In ...
https://dev.mysql.com/doc/refman/8.0/en/numeric-type-syntax.html
For floating-point and fixed-point data types, M is the total number of digits that can be stored. As of MySQL 8.0.17, the UNSIGNED attribute is deprecated for columns of type FLOAT, DOUBLE, and DECIMAL (and any synonyms); you should expect support ... For integer data types, M indicates the minimum display ...
https://dev.mysql.com/doc/refman/8.0/en/select-into.html
Example: SELECT * FROM t1 FOR UPDATE INTO @myvar; The INTO position at the end of the statement is supported as of MySQL 8.0.20, and is the preferred position. Column and line terminators can be specified to produce a specific output format. INTO ...
https://dev.mysql.com/doc/refman/8.0/en/windows-start-service.html
On Windows, the recommended way to run MySQL is to install it as a Windows service, so that MySQL starts and stops automatically when Windows starts and stops. A MySQL server installed as a service can also be controlled from the command line using ...Generally, to install MySQL as a Windows service you should be logged in using an account that has administrator ...
https://dev.mysql.com/doc/refman/8.0/en/binary-varbinary.html
The BINARY and VARBINARY types are similar to CHAR and VARCHAR, except that they store binary strings rather than nonbinary strings. This means they have the binary character set and collation, and comparison and sorting are based on the numeric ...
https://dev.mysql.com/doc/refman/8.0/en/slow-query-log.html
The slow query log can be used to find queries that take a long time to execute and are therefore candidates for optimization. The slow query log consists of SQL statements that take more than long_query_time seconds to execute and require at least ...However, examining a long slow query log can be a time-consuming ...By default, administrative ...
https://dev.mysql.com/doc/refman/8.0/en/error-log-rule-based-filtering.html
This rule set drops information events, and, for other events, removes the source_line field: SET GLOBAL dragnet.log_error_filter_rules = 'IF prio>=INFORMATION THEN drop. To construct more complex conditions, use the AND and OR operators. Both ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-online-ddl-performance.html
Use this clause if the primary concern is finishing the DDL operation in the shortest amount of time possible, and concurrent query and DML access is not necessary. row *************************** Id: 5 User: root Host: localhost db: test Command: ... Online DDL improves several aspects of MySQL operation: Applications that access the table are more responsive because queries and DML operations on the table can proceed while the DDL operation is in ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-events-statements-current-table.html
END_EVENT_ID This column is set to NULL when the event starts and updated to the thread current event number when the event ends. The TIMER_START and TIMER_END values indicate when event timing started and ended. If an event has not finished, ...For ...The table stores one row per thread showing the current status of the thread's most recent monitored statement event, so there is no system variable for configuring the table ...