25.12.10 Performance Schema User-Defined Variable Tables
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 9.4, “User-Defined Variables”.
user_variables_by_thread table contains these columns:
The thread identifier of the session in which the variable is defined.
The variable name, without the leading
The variable value.