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SELECT @@GLOBAL.innodb_data_file_path; 

Most system variables can be set at server startup (read-only variables such as version_comment  are exceptions). Many can be changed at runtime with the SET  statement. See Section 5.1.9, “Using System Variables” , and Section 13.7.6.1, “SET Syntax for Variable Assignment” . 

Partial output is shown here. The list of names and values may differ for your server. Section 5.1.8, “Server System Variables” , describes the meaning of each variable, and Section 5.1.1, “Configuring the Server” , provides information about tuning them. 

mysql> SHOW VARIABLES; 

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