The sys_get_config function retrieves the value of a specified configuration option from the sys_config table, or a user variable if set.
sys.sys_get_config(name,default)sys_get_config is a available with the .
The function returns a configuration option value from the . It takes two arguments; name, a configuration option name, and default, which is returned if the given option does not exist in the table.
Both arguments are VARCHAR(128) and can be NULL. Returns NULL if name is NULL, or if the given option is not found and default is NULL.
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SELECT sys.sys_get_config('ps_thread_trx_info.max_length',NULL);
+----------------------------------------------------------+
| sys.sys_get_config('ps_thread_trx_info.max_length',NULL) |
+----------------------------------------------------------+
| 65535 |
+----------------------------------------------------------+