As of MySQL 5.6.3, 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 22.10.7, “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.
The
performance_schema_max_digest_length
system variable determines the maximum number of bytes
available for computing statement digests. However, the
display length of statement digests may be longer than the
available buffer size due to encoding of statement
components such as keywords and literal values in digest
buffer. Consequently, values selected from the
DIGEST_TEXT column of statement event
tables may appear to exceed the
performance_schema_max_digest_length
value.
This variable was added in MySQL 5.6.26. In MySQL 5.6.24
and 5.6.25, use
max_digest_length
instead. Before 5.6.24, the value cannot be changed.
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.