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# Take a snapshot of SOCKET_INSTANCES
CREATE TEMPORARY TABLE my_socket_instances AS
SELECT * FROM performance_schema.socket_instances;
# Get thread id of the default connection
SELECT THREAD_ID INTO @thread_id
FROM performance_schema.threads
WHERE PROCESSLIST_ID = CONNECTION_ID();
connect con1,$my_localhost,root,,test,,$MASTER_MYPORT;
# Store the thread id of connection 1 (tcp/ip)
SELECT THREAD_ID INTO @thread_id
FROM performance_schema.threads
WHERE PROCESSLIST_ID = CONNECTION_ID();
# Store the port of connection 1 (tcp/ip)
SELECT PORT INTO @port
FROM performance_schema.socket_instances
WHERE THREAD_ID = @thread_id;
connection default;
connect con2,$my_localhost,root,,test,,$MASTER_MYPORT;
# Store the thread_id of connection 2 (tcp/ip)
SELECT THREAD_ID INTO @thread_id
FROM performance_schema.threads
WHERE PROCESSLIST_ID = CONNECTION_ID();
# Store the port of connection 2 (tcp/ip)
SELECT PORT INTO @port
FROM performance_schema.socket_instances
WHERE THREAD_ID = @thread_id;
connection default;
connect con3,localhost,root,,test,,;
# Store the thread id of connection 3 (unix domain)
SELECT THREAD_ID INTO @thread_id
FROM performance_schema.threads
WHERE PROCESSLIST_ID = CONNECTION_ID();
# Store the port of connection 3 (unix domain)
SELECT PORT INTO @port
FROM performance_schema.socket_instances
WHERE THREAD_ID = @thread_id;
connection default;
# EVENT_NAME is the "wait/io/socket/*" instrument identifier.
SELECT COUNT(*) = 0 AS "Expect 1"
FROM performance_schema.socket_instances
WHERE EVENT_NAME NOT LIKE 'wait/io/socket/%';
Expect 1
1
# OBJECT_INSTANCE_BEGIN is an arbitrary identifier, guaranteed to be unique.
SELECT COUNT(*) = COUNT(DISTINCT OBJECT_INSTANCE_BEGIN) AS "Expect 1"
FROM performance_schema.socket_instances;
Expect 1
1
# SOCKET_ID is the internal file handle assigned to the socket.
SELECT COUNT(*) = COUNT(DISTINCT SOCKET_ID) AS "Expect 1"
FROM performance_schema.socket_instances;
Expect 1
1
# Characteristics per our thread
# There must be only one entry with our thread_id
SELECT COUNT(*) = 1 AS 'Expect 1'
FROM performance_schema.socket_instances
WHERE THREAD_ID = @thread_id;
Expect 1
1
# TCP/IP connections should have a unique port number
# Connection 1 (tcp/ip)
SELECT COUNT(*) = 1 AS 'Expect 1'
FROM performance_schema.socket_instances
WHERE PORT = @port;
Expect 1
1
# Connection 2 (tcp/ip)
SELECT COUNT(*) = 1 AS 'Expect 1'
FROM performance_schema.socket_instances
WHERE PORT = @port;
Expect 1
1
# Check the content for the default connection (unix domain)
SELECT COUNT(*) = 1 as 'Expect 1'
FROM performance_schema.socket_instances
WHERE EVENT_NAME = 'wait/io/socket/sql/client_connection'
AND PORT = 0 AND THREAD_ID = @thread_id;
Expect 1
1
# Characteristics of 'server_tcpip_socket' entry
# Server listening socket, TCP/IP
# There are two entries with 'wait/io/socket/sql/server_tcpip_socket',
# for [::] and for 0.0.0.0.
# They share the same thread id with 'wait/io/socket/sql/server_unix_socket'.
SELECT COUNT(*) = 2 AS 'Expect 2'
FROM performance_schema.socket_instances
WHERE EVENT_NAME = 'wait/io/socket/sql/server_tcpip_socket';
Expect 2
1
# Get the 'server_tcpip_socket' thread id
SELECT DISTINCT THREAD_ID INTO @thread_id
FROM performance_schema.socket_instances
WHERE EVENT_NAME = 'wait/io/socket/sql/server_tcpip_socket';
# Check the content.
SELECT THREAD_ID = @thread_id
AND (IP = '0.0.0.0' OR IP = '::')
AND PORT = @port
AND STATE = 'ACTIVE' AS 'Expect 1'
FROM performance_schema.socket_instances
WHERE EVENT_NAME = 'wait/io/socket/sql/server_tcpip_socket';
Expect 1
1
1
# Characteristics of 'server_unix_socket' entry
# Server listening socket, unix domain (socket file)
# There is only one entry with 'wait/io/socket/sql/server_unix_socket'.
# It shares the same thread id as 'wait/io/socket/sql/server_tcpip_socket'.
SELECT COUNT(*) = 1 AS 'Expect 1'
FROM performance_schema.socket_instances
WHERE EVENT_NAME = 'wait/io/socket/sql/server_unix_socket';
Expect 1
1
# Get the 'server_unix_socket' thread id
SELECT THREAD_ID INTO @thread_id
FROM performance_schema.socket_instances
WHERE EVENT_NAME = 'wait/io/socket/sql/server_unix_socket';
# Check the content.
SELECT THREAD_ID = @thread_id
AND IP = ''
AND PORT = 0
AND STATE = 'ACTIVE' AS 'Expect 1'
FROM performance_schema.socket_instances
WHERE EVENT_NAME = 'wait/io/socket/sql/server_unix_socket';
Expect 1
1
# Server listening sockets (TCP and Unix) are handled on the same thread
SELECT COUNT(*) = 3 AS 'Expect 3'
FROM performance_schema.socket_instances
WHERE THREAD_ID = @thread_id;
Expect 3
1
SELECT COUNT(*) = 3 AS 'Expect 3'
FROM performance_schema.socket_instances
WHERE THREAD_ID = @thread_id;
Expect 3
1
#Compare server listener socket thread ids
select @match_thread_id;
@match_thread_id
1
# Check content for client connection 1 (tcpip)
SELECT EVENT_NAME = 'wait/io/socket/sql/client_connection'
AND (IP LIKE '%127.0.0.1' OR IP = '::1')
AND PORT = @port
AS 'Expect 1'
FROM performance_schema.socket_instances
WHERE THREAD_ID = @thread_id;
Expect 1
1
# Characteristics of entries with THREAD_ID of con1
# There is only one entry with this id.
SELECT COUNT(*) = 1 AS 'Expect 1'
FROM performance_schema.socket_instances
WHERE THREAD_ID = @thread_id;
Expect 1
1
# Check content for client connection 2 (tcpip)
SELECT EVENT_NAME = 'wait/io/socket/sql/client_connection'
AND (IP LIKE '%127.0.0.1' OR IP = '::1')
AND PORT = @port
AS 'Expect 1'
FROM performance_schema.socket_instances
WHERE THREAD_ID = @thread_id;
Expect 1
1
# Characteristics of entries with THREAD_ID of con2
# There is only one entry with this id.
SELECT COUNT(*) = 1 AS 'Expect 1'
FROM performance_schema.socket_instances
WHERE THREAD_ID = @thread_id;
Expect 1
1
# Check the content for client connection 3 (unix domain).
SELECT EVENT_NAME = 'wait/io/socket/sql/client_connection'
AND IP = ''
AND PORT = 0
AS 'Expect 1'
FROM performance_schema.socket_instances
WHERE THREAD_ID = @thread_id;
Expect 1
1
# Characteristics of entries with THREAD_ID of con3
# There is only one entry with this id.
SELECT COUNT(*) = 1 AS 'Expect 1'
FROM performance_schema.socket_instances
WHERE THREAD_ID = @thread_id;
Expect 1
1
# Show differences to socket_instances before con1, con2 and con3 connecting
SELECT EVENT_NAME, IP
FROM performance_schema.socket_instances
WHERE (EVENT_NAME,OBJECT_INSTANCE_BEGIN,THREAD_ID,SOCKET_ID,IP,PORT,STATE)
NOT IN (SELECT EVENT_NAME,OBJECT_INSTANCE_BEGIN,THREAD_ID,SOCKET_ID,IP,PORT,STATE
FROM my_socket_instances)
ORDER BY THREAD_ID;
EVENT_NAME IP
wait/io/socket/sql/client_connection <LOCALHOST>
wait/io/socket/sql/client_connection <LOCALHOST>
wait/io/socket/sql/client_connection
connection default;
connection con1;
disconnect con1;
connection con2;
disconnect con2;
connection con3;
disconnect con3;
connection default;
# After waiting a bit we should have no differences to socket_instances
# before con1, con2, con3 connecting.
SELECT *
FROM performance_schema.socket_instances
WHERE (EVENT_NAME,OBJECT_INSTANCE_BEGIN,THREAD_ID,SOCKET_ID,IP,PORT,STATE)
NOT IN (SELECT EVENT_NAME,OBJECT_INSTANCE_BEGIN,THREAD_ID,SOCKET_ID,IP,PORT,STATE
FROM my_socket_instances)
ORDER BY THREAD_ID;
EVENT_NAME OBJECT_INSTANCE_BEGIN THREAD_ID SOCKET_ID IP PORT STATE
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