install soname "password_reuse_check";
set global password_reuse_check_interval= 0;
# Default value (sould be unlimited i.e. 0)
SHOW GLOBAL VARIABLES like "password_reuse_check%";
Variable_name	Value
password_reuse_check_interval	0
# insert user
grant select on *.* to user_name@localhost identified by 'test_pwd';
grant select on *.* to user_name@localhost identified by 'test_pwd';
ERROR HY000: Your password does not satisfy the current policy requirements
show warnings;
Level	Code	Message
Warning	1819	password_reuse_check: The password was already used
Error	1819	Your password does not satisfy the current policy requirements
alter user user_name@localhost identified by 'test_pwd';
ERROR HY000: Operation ALTER USER failed for 'user_name'@'localhost'
show warnings;
Level	Code	Message
Warning	1819	password_reuse_check: The password was already used
Error	1819	Your password does not satisfy the current policy requirements
Error	1396	Operation ALTER USER failed for 'user_name'@'localhost'
# check exparation
set global password_reuse_check_interval= 10;
alter user user_name@localhost identified by 'test_pwd';
ERROR HY000: Operation ALTER USER failed for 'user_name'@'localhost'
show warnings;
Level	Code	Message
Warning	1819	password_reuse_check: The password was already used
Error	1819	Your password does not satisfy the current policy requirements
Error	1396	Operation ALTER USER failed for 'user_name'@'localhost'
select hex(hash) from mysql.password_reuse_check_history;
hex(hash)
6276C87127F2B65FC6B24E94E324A02FF0D393D7FB7DEAF6F5F49F0A8AB006711D5C6EF67E36A251AB6337E7E20D312F9ED66D70EB699A6EC85B1E0BC7F376C0
# emulate old password
update mysql.password_reuse_check_history set time= date_sub(now(), interval
11 day);
alter user user_name@localhost identified by 'test_pwd';
show warnings;
Level	Code	Message
drop user user_name@localhost;
show create table mysql.password_reuse_check_history;
Table	Create Table
password_reuse_check_history	CREATE TABLE `password_reuse_check_history` (
  `hash` binary(64) NOT NULL,
  `time` timestamp NOT NULL DEFAULT current_timestamp(),
  PRIMARY KEY (`hash`),
  KEY `tm` (`time`)
) ENGINE=Aria DEFAULT CHARSET=latin1 PAGE_CHECKSUM=1
select count(*) from mysql.password_reuse_check_history;
count(*)
1
drop table mysql.password_reuse_check_history;
# test error messages
set global password_reuse_check_interval= 0;
drop table if exists mysql.password_reuse_check_history;
Warnings:
Note	1051	Unknown table 'mysql.password_reuse_check_history'
# test error messages
create table mysql.password_reuse_check_history (wrong_structure int);
grant select on *.* to user_name@localhost identified by 'test_pwd';
ERROR HY000: Your password does not satisfy the current policy requirements
show warnings;
Level	Code	Message
Warning	1105	password_reuse_check:[1054] Unknown column 'hash' in 'field list'
Error	1819	Your password does not satisfy the current policy requirements
set global password_reuse_check_interval= 10;
grant select on *.* to user_name@localhost identified by 'test_pwd';
ERROR HY000: Your password does not satisfy the current policy requirements
show warnings;
Level	Code	Message
Warning	1105	password_reuse_check:[1054] Unknown column 'time' in 'where clause'
Error	1819	Your password does not satisfy the current policy requirements
drop table mysql.password_reuse_check_history;
uninstall plugin password_reuse_check;