1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
select * from performance_schema.host_cache
where IP like '%' limit 1;
select * from performance_schema.host_cache
where IP='localhost';
insert into performance_schema.host_cache
set IP='FOO', SUM_BLOCKING_ERRORS=1, COUNT_FCRDNS_ERRORS=2;
ERROR 42000: INSERT command denied to user 'root'@'localhost' for table 'host_cache'
update performance_schema.host_cache
set COUNT_UNKNOWN_ERRORS=12;
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table 'host_cache'
update performance_schema.host_cache
set SUM_BLOCKING_ERRORS=12 where IP='127.0.0.1';
ERROR 42000: UPDATE command denied to user 'root'@'localhost' for table 'host_cache'
select HOST from performance_schema.host_cache
where IP='::1';
HOST
delete from performance_schema.host_cache
where IP='::1';
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'host_cache'
delete from performance_schema.host_cache;
ERROR 42000: DELETE command denied to user 'root'@'localhost' for table 'host_cache'
LOCK TABLES performance_schema.host_cache READ;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'host_cache'
UNLOCK TABLES;
LOCK TABLES performance_schema.host_cache WRITE;
ERROR 42000: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'host_cache'
UNLOCK TABLES;
#
# MDEV-25325 column_comment for performance_schema tables
#
select column_name, column_comment
from information_schema.columns
where table_schema='performance_schema' and table_name='host_cache';
column_name column_comment
IP Client IP address.
HOST IP's resolved DNS host name, or NULL if unknown.
HOST_VALIDATED YES if the IP-to-host DNS lookup was successful, and the HOST column can be used to avoid DNS calls, or NO if unsuccessful, in which case DNS lookup is performed for each connect until either successful or a permanent error.
SUM_CONNECT_ERRORS Number of connection errors. Counts only protocol handshake errors for hosts that passed validation. These errors count towards max_connect_errors.
COUNT_HOST_BLOCKED_ERRORS Number of blocked connections because SUM_CONNECT_ERRORS exceeded the max_connect_errors system variable.
COUNT_NAMEINFO_TRANSIENT_ERRORS Number of transient errors during IP-to-host DNS lookups.
COUNT_NAMEINFO_PERMANENT_ERRORS Number of permanent errors during IP-to-host DNS lookups.
COUNT_FORMAT_ERRORS Number of host name format errors, for example a numeric host column.
COUNT_ADDRINFO_TRANSIENT_ERRORS Number of transient errors during host-to-IP reverse DNS lookups.
COUNT_ADDRINFO_PERMANENT_ERRORS Number of permanent errors during host-to-IP reverse DNS lookups.
COUNT_FCRDNS_ERRORS Number of forward-confirmed reverse DNS errors, which occur when IP-to-host DNS lookup does not match the originating IP address.
COUNT_HOST_ACL_ERRORS Number of errors occurring because no user from the host is permitted to log in. These attempts return error code 1130 ER_HOST_NOT_PRIVILEGED and do not proceed to username and password authentication.
COUNT_NO_AUTH_PLUGIN_ERRORS Number of errors due to requesting an authentication plugin that was not available. This can be due to the plugin never having been loaded, or the load attempt failing.
COUNT_AUTH_PLUGIN_ERRORS Number of errors reported by an authentication plugin. Plugins can increment COUNT_AUTHENTICATION_ERRORS or COUNT_HANDSHAKE_ERRORS instead, but, if specified or the error is unknown, this column is incremented.
COUNT_HANDSHAKE_ERRORS Number of errors detected at the wire protocol level.
COUNT_PROXY_USER_ERRORS Number of errors detected when a proxy user is proxied to a user that does not exist.
COUNT_PROXY_USER_ACL_ERRORS Number of errors detected when a proxy user is proxied to a user that exists, but the proxy user doesn't have the PROXY privilege.
COUNT_AUTHENTICATION_ERRORS Number of errors where authentication failed.
COUNT_SSL_ERRORS Number of errors due to TLS problems.
COUNT_MAX_USER_CONNECTIONS_ERRORS Number of errors due to the per-user quota being exceeded.
COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS Number of errors due to the per-hour quota being exceeded.
COUNT_DEFAULT_DATABASE_ERRORS Number of errors due to the user not having permission to access the specified default database, or it not existing.
COUNT_INIT_CONNECT_ERRORS Number of errors due to statements in the init_connect system variable.
COUNT_LOCAL_ERRORS Number of local server errors, such as out-of-memory errors, unrelated to network, authentication, or authorization.
COUNT_UNKNOWN_ERRORS Number of unknown errors that cannot be allocated to another column.
FIRST_SEEN Timestamp of the first connection attempt by the IP.
LAST_SEEN Timestamp of the most recent connection attempt by the IP.
FIRST_ERROR_SEEN Timestamp of the first error seen from the IP.
LAST_ERROR_SEEN Timestamp of the most recent error seen from the IP.
|
