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https://dev.mysql.com/doc/refman/8.4/en/performance-schema-user-variable-tables.html
The Performance Schema provides a user_variables_by_thread table that exposes user-defined variables. These are variables defined within a specific session and include a @ character preceding the name; see Section 11.4, “User-Defined Variables”. The user_variables_by_thread table has these columns: THREAD_ID The thread identifier of the session in which the variable is ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-users-table.html
The users table contains a row for each user who has connected to the MySQL server. For each user name, the table counts the current and total number of connections. To set the table size explicitly, set the performance_schema_users_size system ...
https://dev.mysql.com/doc/refman/8.4/en/platform-support.html
MySQL platform support evolves over time; please refer to https://www.mysql.com/support/supportedplatforms/database.html for the latest updates.
https://dev.mysql.com/doc/refman/8.4/en/plugin-services.html
MySQL server plugins have access to server “plugin services.” The plugin services interface complements the plugin API by exposing server functionality that plugins can call. For developer information about writing plugin services, see MySQL ...
https://dev.mysql.com/doc/refman/8.4/en/point-in-time-recovery-positions.html
The last section, Section 9.5.1, “Point-in-Time Recovery Using Binary Log”, explains the general idea of using the binary log to perform a point-in-time-recovery. As an example, suppose that around 20:06:00 on March 11, 2020, an SQL statement ...
https://dev.mysql.com/doc/refman/8.4/en/populating-spatial-columns.html
After you have created spatial columns, you can populate them with spatial data. Values should be stored in internal geometry format, but you can convert them to that format from either Well-Known Text (WKT) or Well-Known Binary (WKB) format. For ...
https://dev.mysql.com/doc/refman/8.4/en/precision-math-examples.html
This section provides some examples that show precision math query results in MySQL. These examples demonstrate the principles described in Section 14.24.3, “Expression Handling”, and Section 14.24.4, “Rounding Behavior”. Consider the ...
https://dev.mysql.com/doc/refman/8.4/en/precision-math-expressions.html
With precision math, exact-value numbers are used as given whenever possible. For example, numbers in comparisons are used exactly as given without a change in value. In strict SQL mode, for INSERT into a column with an exact data type (DECIMAL or ...
https://dev.mysql.com/doc/refman/8.4/en/precision-math-rounding.html
This section discusses precision math rounding for the ROUND() function and for inserts into columns with exact-value types (DECIMAL and integer). The ROUND() function rounds differently depending on whether its argument is exact or approximate: ...
https://dev.mysql.com/doc/refman/8.4/en/precision-math.html
MySQL provides support for precision math: numeric value handling that results in extremely accurate results and a high degree control over invalid values. Precision math is based on these two features: SQL modes that control how strict the server ...