========================================================================
STEP 1 - SETUP
========================================================================
CREATE PROCEDURE handleError() 
BEGIN
DECLARE no_such_table CONDITION FOR 1146;
DECLARE CONTINUE HANDLER FOR no_such_table select 1;
INSERT INTO test.no_table values (1);
END//
CREATE PROCEDURE signalError() 
BEGIN
DECLARE mycond CONDITION FOR SQLSTATE '42S02';
SIGNAL mycond SET MESSAGE_TEXT = 'An error occurred';
END//
CREATE PROCEDURE bigError()
BEGIN
SIGNAL SQLSTATE "HY000" SET MYSQL_ERRNO = 40000, MESSAGE_TEXT = "A big error number";
END//
truncate  performance_schema.events_errors_summary_by_thread_by_error;
truncate  performance_schema.events_errors_summary_by_user_by_error;
truncate  performance_schema.events_errors_summary_by_host_by_error;
truncate  performance_schema.events_errors_summary_by_account_by_error;
truncate  performance_schema.events_errors_summary_global_by_error;

# Control thread


# Create new user user1.

create user user1@localhost;
grant ALL on *.* to user1@localhost;

# Create new user user2.

create user user2@localhost;
grant ALL on *.* to user2@localhost;

# Connection 1

use bad_db;
ERROR 42000: Unknown database 'bad_db'
SELECT * from test.no_table;
ERROR 42S02: Table 'test.no_table' doesn't exist
call signalError();
ERROR 42S02: An error occurred
call bigError();
ERROR HY000: A big error number

# Connection 2

SELECT * from test.no_table;
ERROR 42S02: Table 'test.no_table' doesn't exist
I dont know the syntax;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'I dont know the syntax' at line 1
call handleError();
1
1
#-------------------------------------------------------------
# Now see the error stats from P_S tables.
#-------------------------------------------------------------

# events_errors_summary_by_thread_by_error.
ERROR_NUMBER	ERROR_NAME	SQL_STATE	SUM_ERROR_RAISED	SUM_ERROR_HANDLED
NULL	NULL	NULL	1	0
1049	ER_BAD_DB_ERROR	42000	1	0
1146	ER_NO_SUCH_TABLE	42S02	1	0
1644	ER_SIGNAL_EXCEPTION	HY000	1	0
ERROR_NUMBER	ERROR_NAME	SQL_STATE	SUM_ERROR_RAISED	SUM_ERROR_HANDLED
1064	ER_PARSE_ERROR	42000	1	0
1146	ER_NO_SUCH_TABLE	42S02	1	1

# events_errors_summary_by_user_by_error.
SELECT USER, ERROR_NUMBER, ERROR_NAME, SQL_STATE, SUM_ERROR_RAISED, SUM_ERROR_HANDLED from performance_schema.events_errors_summary_by_user_by_error where SUM_ERROR_HANDLED>0 OR SUM_ERROR_RAISED>0;
USER	ERROR_NUMBER	ERROR_NAME	SQL_STATE	SUM_ERROR_RAISED	SUM_ERROR_HANDLED
user1	NULL	NULL	NULL	1	0
user1	1049	ER_BAD_DB_ERROR	42000	1	0
user1	1146	ER_NO_SUCH_TABLE	42S02	1	0
user1	1644	ER_SIGNAL_EXCEPTION	HY000	1	0
user2	1064	ER_PARSE_ERROR	42000	1	0
user2	1146	ER_NO_SUCH_TABLE	42S02	1	1

# events_errors_summary_by_host_by_error.
SELECT HOST, ERROR_NUMBER, ERROR_NAME, SQL_STATE, SUM_ERROR_RAISED, SUM_ERROR_HANDLED from performance_schema.events_errors_summary_by_host_by_error where SUM_ERROR_HANDLED>0 OR SUM_ERROR_RAISED>0;
HOST	ERROR_NUMBER	ERROR_NAME	SQL_STATE	SUM_ERROR_RAISED	SUM_ERROR_HANDLED
localhost	NULL	NULL	NULL	1	0
localhost	1049	ER_BAD_DB_ERROR	42000	1	0
localhost	1064	ER_PARSE_ERROR	42000	1	0
localhost	1146	ER_NO_SUCH_TABLE	42S02	2	1
localhost	1644	ER_SIGNAL_EXCEPTION	HY000	1	0

# events_errors_summary_by_account_by_error.
SELECT USER, HOST, ERROR_NUMBER, ERROR_NAME, SQL_STATE, SUM_ERROR_RAISED, SUM_ERROR_HANDLED from performance_schema.events_errors_summary_by_account_by_error where SUM_ERROR_HANDLED>0 OR SUM_ERROR_RAISED>0;
USER	HOST	ERROR_NUMBER	ERROR_NAME	SQL_STATE	SUM_ERROR_RAISED	SUM_ERROR_HANDLED
user1	localhost	NULL	NULL	NULL	1	0
user1	localhost	1049	ER_BAD_DB_ERROR	42000	1	0
user1	localhost	1146	ER_NO_SUCH_TABLE	42S02	1	0
user1	localhost	1644	ER_SIGNAL_EXCEPTION	HY000	1	0
user2	localhost	1064	ER_PARSE_ERROR	42000	1	0
user2	localhost	1146	ER_NO_SUCH_TABLE	42S02	1	1

# events_errors_summary_global_by_error.
SELECT ERROR_NUMBER, ERROR_NAME, SQL_STATE, SUM_ERROR_RAISED, SUM_ERROR_HANDLED from performance_schema.events_errors_summary_global_by_error where SUM_ERROR_HANDLED>0 OR SUM_ERROR_RAISED>0;
ERROR_NUMBER	ERROR_NAME	SQL_STATE	SUM_ERROR_RAISED	SUM_ERROR_HANDLED
NULL	NULL	NULL	1	0
1049	ER_BAD_DB_ERROR	42000	1	0
1064	ER_PARSE_ERROR	42000	1	0
1146	ER_NO_SUCH_TABLE	42S02	2	1
1644	ER_SIGNAL_EXCEPTION	HY000	1	0

#-----------------------------------------------------
# Truncate stats
#-----------------------------------------------------
TRUNCATE performance_schema.events_errors_summary_by_thread_by_error;
TRUNCATE performance_schema.events_errors_summary_by_user_by_error;
TRUNCATE performance_schema.events_errors_summary_by_host_by_error;
TRUNCATE performance_schema.events_errors_summary_by_account_by_error;
TRUNCATE performance_schema.events_errors_summary_global_by_error;
SELECT * from performance_schema.events_errors_summary_by_thread_by_error where SUM_ERROR_HANDLED>0 OR SUM_ERROR_RAISED>0;
THREAD_ID	ERROR_NUMBER	ERROR_NAME	SQL_STATE	SUM_ERROR_RAISED	SUM_ERROR_HANDLED	FIRST_SEEN	LAST_SEEN
SELECT * from performance_schema.events_errors_summary_by_user_by_error where SUM_ERROR_HANDLED>0 OR SUM_ERROR_RAISED>0;
USER	ERROR_NUMBER	ERROR_NAME	SQL_STATE	SUM_ERROR_RAISED	SUM_ERROR_HANDLED	FIRST_SEEN	LAST_SEEN
SELECT * from performance_schema.events_errors_summary_by_host_by_error where SUM_ERROR_HANDLED>0 OR SUM_ERROR_RAISED>0;
HOST	ERROR_NUMBER	ERROR_NAME	SQL_STATE	SUM_ERROR_RAISED	SUM_ERROR_HANDLED	FIRST_SEEN	LAST_SEEN
SELECT * from performance_schema.events_errors_summary_by_account_by_error where SUM_ERROR_HANDLED>0 OR SUM_ERROR_RAISED>0;
USER	HOST	ERROR_NUMBER	ERROR_NAME	SQL_STATE	SUM_ERROR_RAISED	SUM_ERROR_HANDLED	FIRST_SEEN	LAST_SEEN
SELECT * from performance_schema.events_errors_summary_global_by_error where SUM_ERROR_HANDLED>0 OR SUM_ERROR_RAISED>0;
ERROR_NUMBER	ERROR_NAME	SQL_STATE	SUM_ERROR_RAISED	SUM_ERROR_HANDLED	FIRST_SEEN	LAST_SEEN
drop procedure handleError;
drop procedure signalError;
drop procedure bigError;
drop user user1@localhost;
drop user user2@localhost;