MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6
Application programs can provide key-value connection attributes to be passed to the server at connect time. For descriptions of common attributes, see Section 25.12.9, “Performance Schema Connection Attribute Tables”.
The session_connect_attrs table
contains connection attributes for all sessions. To see
connection attributes only for the current session, and other
sessions associated with the session account, use the
session_account_connect_attrs
table.
The session_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_connect_attrs
table.