MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6
The accounts table contains a row
for each account that has connected to the MySQL server. For
each account, the table counts the current and total number of
connections. The table size is autosized at server startup. To
set the table size explicitly, set the
performance_schema_accounts_size
system variable at server startup. To disable account
statistics, set this variable to 0.
The accounts table has the
following columns. For a description of how the Performance
Schema maintains rows in this table, including the effect of
TRUNCATE TABLE, see
Section 25.12.8, “Performance Schema Connection Tables”.
USER
The client user name for the connection. This is
NULL for an internal thread, or for a
user session that failed to authenticate.
HOST
The host from which the client connected. This is
NULL for an internal thread, or for a
user session that failed to authenticate.
CURRENT_CONNECTIONS
The current number of connections for the account.
TOTAL_CONNECTIONS
The total number of connections for the account.