is a MySQL feature that provides access to database metadata.
This section provides information and usage examples for a subset of
tables related to compression, transactions, and locking. For a
complete list of
tables, see Section 21.28, “INFORMATION_SCHEMA Tables for InnoDB”.
tables are themselves plugins to the MySQL server, and must be
INSTALL statements. If they are
installed, but the
InnoDB storage engine plugin
is not installed, these tables appear to be empty.