详解MySQL如何使用离线模式维护服务器

pt-kill --host=192.168.11.11 --user=percona -p --sentinel /tmp/pt-kill.sentinel2 --pid /tmp/pt-kill.pid --victims all --match-command 'Query' --ignore-user 'pmm|rdsadmin|system_user|percona' --busy-time 10 --verbose --print --kill
select concat('kill ',id,';') from information_schema.processlist where user='app_user';

mysql> create user app_user identified by 'App@!234TEst';
Query OK, 0 rows affected (0.20 sec)
mysql> GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP , REFERENCES, INDEX, ALTER, SHOW DATABASES, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE,CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, CREATE USER, EVENT, TRIGGER, CREATE TABLESPACE on *.* to app_user;
Query OK, 0 rows affected (0.00 sec)

[root@centos12 vagrant]# sysbench /usr/share/sysbench/oltp_read_write.lua --threads=10 --time=100? --mysql-db=sysbench --mysql-user=app_user --mysql-password='App@!234TEst' run
sysbench 1.0.20 (using bundled LuaJIT 2.1.0-beta2)
Running the test with following options:
Number of threads: 10
Initializing random number generator from current time
Initializing worker threads...

mysql> show processlist;
+----+-----------------+---------------------+----------+-------------+------+-----------------------------------------------------------------+------------------------------------------------------------------------------------------------------+---------+-----------+---------------+
| Id | User | Host | db | Command | Time | State | Info | Time_ms | Rows_sent | Rows_examined |
+----+-----------------+---------------------+----------+-------------+------+-----------------------------------------------------------------+------------------------------------------------------------------------------------------------------+---------+-----------+---------------+
| 5 | event_scheduler | localhost | NULL | Daemon | 2151 | Waiting for next activation | NULL | 2151034 | 0 | 0 |
| 9 | bhuvan | 192.168.33.11:50642 | NULL | Binlog Dump | 2102 | Source has sent all binlog to replica; waiting for more updates | NULL | 2102317 | 0 | 0 |
| 14 | bhuvan | localhost | NULL | Query | 0 | init | show processlist | 0 | 0 | 0 |
| 20 | app_user | localhost | sysbench | Execute | 0 | waiting for handler commit | COMMIT | 11 | 0 | 0 |
| 21 | app_user | localhost | sysbench | Execute | 0 | updating | DELETE FROM sbtest1 WHERE id=5000 | 6 | 0 | 0 |
| 23 | app_user | localhost | sysbench | Execute | 0 | waiting for handler commit | COMMIT | 8 | 0 | 0 |
| 24 | app_user | localhost | sysbench | Execute | 0 | waiting for handler commit | COMMIT | 18 | 0 | 0 |
| 25 | app_user | localhost | sysbench | Execute | 0 | updating | UPDATE sbtest1 SET c='99153469917-25523144931-18125321038-96151238215-88445737418-14906501975-136014 | 13 | 0 | 0 |
| 27 | app_user | localhost | sysbench | Execute | 0 | waiting for handler commit | COMMIT | 7 | 0 | 0 |
| 28 | app_user | localhost | sysbench | Execute | 0 | statistics | SELECT c FROM sbtest1 WHERE id=5003 | 0 | 0 | 0 |
| 29 | app_user | localhost | sysbench | Execute | 0 | updating | UPDATE sbtest1 SET c='84180675456-88426921120-90373546373-84823361786-77912396694-08592771856-912331 | 13 | 0 | 0 |
+----+-----------------+---------------------+----------+-------------+------+-----------------------------------------------------------------+------------------------------------------------------------------------------------------------------+---------+-----------+---------------+
13 rows in set (0.00 sec)

mysql> select @@offline_mode;
+----------------+
| @@offline_mode |
+----------------+
| 0 |
+----------------+
1 row in set (0.15 sec)
mysql> set global offline_mode=1;
Query OK, 0 rows affected (0.15 sec)
mysql> show processlist;
+----+-----------------+---------------------+------+-------------+------+-----------------------------------------------------------------+------------------+---------+-----------+---------------+
| Id | User | Host | db | Command | Time | State | Info | Time_ms | Rows_sent | Rows_examined |
+----+-----------------+---------------------+------+-------------+------+-----------------------------------------------------------------+------------------+---------+-----------+---------------+
| 5 | event_scheduler | localhost | NULL | Daemon | 2178 | Waiting for next activation | NULL | 2178008 | 0 | 0 |
| 9 | bhuvan | 192.168.33.11:50642 | NULL | Binlog Dump | 2129 | Source has sent all binlog to replica; waiting for more updates | NULL | 2129291 | 0 | 0 |
| 14 | bhuvan | localhost | NULL | Query | 0 | init | show processlist | 0 | 0 | 0 |
+----+-----------------+---------------------+------+-------------+------+-----------------------------------------------------------------+------------------+---------+-----------+---------------+
3 rows in set (0.01 sec)

mysql> set global offline_mode=0;
Query OK, 0 rows affected (0.00 sec)