Application programs can provide key-value connection attributes to be passed to the server at connect time. For descriptions of common attributes, see Section 10.9, “Performance Schema Connection Attribute Tables”.
          The session_account_connect_attrs
          table contains connection attributes only for the current
          session, and other sessions associated with the session
          account. To see connection attributes for all sessions, use
          the session_connect_attrs table.
        
          The session_account_connect_attrs
          table has these columns:
- PROCESSLIST_ID- The connection identifier for the session. 
- ATTR_NAME- The attribute name. 
- ATTR_VALUE- The attribute value. 
- ORDINAL_POSITION- The order in which the attribute was added to the set of connection attributes. 
          TRUNCATE TABLE is not permitted
          for the
          session_account_connect_attrs
          table.