MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6
Enables Performance Schema consumers with names that contain the argument. Produces a result set indicating how many consumers were enabled. Already enabled consumers do not count.
consumer VARCHAR(128): The value used
to match consumer names, which are identified by using
%consumer% as an operand for a
LIKE pattern match.
A value of '' matches all consumers.