MySQL5.6.30如何升級到MySQL5.7.18

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本次升級采用：out of place 邏輯升級方式：

基本步驟：
①：停止業務，備份現有數據庫（mysqldump 方式或者物理備份）
②：下載 MySQL5.7.18 軟件包，然后安裝到別的目錄，
③：修改配置 my.cnf 配置文件，指定 basedir 為新的軟件目錄
④：啟動新版本數據庫，然后執行 mysql_upgrade -uroot -p 升級數據庫；
⑤：升級完成，重啟數據庫
⑥：檢查升級結果：select version();

升級 MySQL 檢查：
①：現有 MySQL 數據庫是否已經備份
②：業務是否已經停止

1、檢查現有環境：
①：檢查 MySQL 狀態：
[mysql@db2 ~]$ ps -ef | grep mysql
mysql 1806 1 0 14:36 ? 00:00:00 /bin/sh /mysql/bin/mysqld_safe –defaults-file=/mysql/my.cnf
mysql 1868 1806 0 14:36 ? 00:00:00 /mysql/bin/mysqld –defaults-file=/mysql/my.cnf –basedir=/mysql –datadir=/mysql/data –plugin-dir=/mysql/lib/plugin –log-error=/mysql/data/db2.err –pid-file=/mysql/data/db2.pid

②：查看現有配置文件
[mysql@db2 ~]$ vim /mysql/my.cnf

[mysql]
no_auto_rehash
default_character_set = utf8
socket = /mysql/data/mysql.sock

[client]
default_character_set = utf8

[mysqld]

server_id = 1607
port = 3306
basedir = /mysql/
datadir = /mysql/data/
socket = /mysql/data/mysql.sock
pid_file = /mysql/data/mysql.pid
log_error = /mysql/data/mysql_error.log
log_bin = /mysql/data/mysql_bin
relay_log = /mysql/data/relay_bin
character_set_server = utf8
collation_server = utf8_general_ci

innodb_buffer_pool_size = 8G
innodb_buffer_pool_instances = 8
innodb_log_file_size = 1G
innodb_log_files_in_group = 3
innodb_log_buffer_size = 24M
innodb_flush_log_at_trx_commit = 1
innodb_file_per_table = 1
innodb_flush_method = O_DIRECT
innodb_io_capacity = 200
innodb_io_capacity_max = 600
innodb_thread_concurrency = 0
innodb_autoinc_lock_mode = 2
innodb_lock_wait_timeout = 60
innodb_read_io_threads = 4
innodb_write_io_threads = 4
innodb_max_dirty_pages_pct = 80
innodb_autoextend_increment = 512
innodb_checksum_algorithm = NONE
innodb_doublewrite = 0
innodb_use_native_aio = 1
innodb_open_files = 8192

sync_binlog = 1
sync_relay_log = 1
relay_log_info_repository = TABLE
master_info_repository = TABLE
expire_logs_days = 10
binlog_format = ROW
transaction-isolation = READ-COMMITTED
concurrent_insert = 2
skip_slave_start = TRUE

back_log = 2000
thread_stack = 256k
thread_cache_size = 256
key_buffer_size = 256M
tmp_table_size = 64M
read_buffer_size = 2M
read_rnd_buffer_size = 8M
sort_buffer_size = 2M
join_buffer_size = 2M
query_cache_size = 0
query_cache_type = 0
max_heap_table_size = 64M
binlog_cache_size = 2M
table_open_cache = 8192
max_allowed_packet = 64M
bulk_insert_buffer_size = 64M

max_connect_errors = 100000
max_connections = 500
connect_timeout = 300
wait_timeout = 86400
interactive_timeout = 86400
lower_case_table_names = 1
open_files_limit = 20480
skip_name_resolve
skip_external_locking
explicit_defaults_for_timestamp = TRUE
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

③：檢查現有 MySQL 的版本信息：
[mysql@db2 ~]$ mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 6
Server version: 5.6.30 Source distribution

Type help; or \h for help. Type \c to clear the current input statement.

mysql \s
————–
mysql Ver 14.14 Distrib 5.6.30, for Linux (x86_64) using EditLine wrapper

Connection id: 6
Current database:
Current user: root@localhost
SSL: Not in use
Current pager: stdout
Using outfile:
Using delimiter: ;
Server version: 5.6.30 Source distribution
Protocol version: 10
Connection: Localhost via UNIX socket
Server characterset: latin1
Db characterset: latin1
Client characterset: utf8
Conn. characterset: utf8
UNIX socket: /tmp/mysql.sock
Uptime: 5 min 32 sec

Threads: 1 Questions: 18 Slow queries: 0 Opens: 67 Flush tables: 1 Open tables: 60 Queries per second avg: 0.054
————–

mysql select version();
+———–+
| version() |
+———–+
| 5.6.30 |
+———–+
1 row in set (0.01 sec)

mysql

④：關閉數據庫：
[mysql@db2 ~]$ mysql -u root -p –execute= SET GLOBAL innodb_fast_shutdown=0
Enter password:
[mysql@db2 ~]$ mysql -u root -p –execute= show global variables like innodb_fast_shutdown
Enter password:
+———————-+——-+
| Variable_name | Value |
+———————-+——-+
| innodb_fast_shutdown | 0 |
+———————-+——-+
[mysql@db2 ~]$ mysqladmin -uroot -p shutdown
Enter password:

注意：innodb_fast_shutdown 參數解釋：
關閉：innodb_fast_shutdown=
0：完成所有的 full purge 和 merge insert buffer 操作 (如：做 InnoDB plugin 升級時)
1：默認，不需要完成上述操作，但會刷新緩沖池中的臟頁
2：不完成上述兩個操作，而是將日志寫入日志文件，下次啟動時，會執行恢復操作 recovery
沒有正常地關閉數據庫(如：kill 命令)/innodb_fast_shutdown= 2 時，需要進行恢復操作。

2、下載 mysql5.7.18, 并且解壓到新目錄
mysql-5.7.18-linux-glibc2.5-x86_64.tar.gz （這個軟件包解壓后就可以用，不用安裝）
[mysql@db2 ~]$ tar zxvf mysql-5.7.18-linux-glibc2.5-x86_64.tar.gz （把軟件直接解壓到 /home/mysql）
[mysql@db2 ~]$ mv mysql-5.7.18-linux-glibc2.5-x86_64/ mysql5718 (mysql5718 這個就是新的軟件目錄)

3、修改配置文件：my.cnf
[mysql@db2 mysql5718]$ cp /mysql/my.cnf ./
[mysql@db2 mysql5718]$ vim my.cnf
basedir = /home/mysql/mysql5718/ —– 只需要修改這一行就可以，指向新目錄

4、使用新軟件啟動 MySQL 數據庫：
[mysql@db2 mysql5718]$ /home/mysql/mysql5718/bin/mysqld_safe –defaults-file=/home/mysql/mysql5718/my.cnf –socket=/mysql/data/mysql.sock

5、升級 MySQL：
[mysql@db2 mysql5718]$ /home/mysql/mysql5718/bin/mysql_upgrade -uroot -p –socket=/mysql/data/mysql.sock
Enter password:
Checking if update is needed.
Checking server version.
Running queries to upgrade MySQL server.
Checking system database.
mysql.columns_priv OK
mysql.db OK
mysql.engine_cost OK
mysql.event OK
mysql.func OK
mysql.general_log OK
mysql.gtid_executed OK
mysql.help_category OK
mysql.help_keyword OK
mysql.help_relation OK
mysql.help_topic OK
mysql.innodb_index_stats OK
mysql.innodb_table_stats OK
mysql.ndb_binlog_index OK
mysql.plugin OK
mysql.proc OK
mysql.procs_priv OK
mysql.proxies_priv OK
mysql.server_cost OK
mysql.servers OK
mysql.slave_master_info OK
mysql.slave_relay_log_info OK
mysql.slave_worker_info OK
mysql.slow_log OK
mysql.tables_priv OK
mysql.time_zone OK
mysql.time_zone_leap_second OK
mysql.time_zone_name OK
mysql.time_zone_transition OK
mysql.time_zone_transition_type OK
mysql.user OK
Upgrading the sys schema.
Checking databases.
sys.sys_config OK
Upgrade process completed successfully.
Checking if update is needed.

出現上述信息，就表明 MySQL 升級完成了；

6、升級完成后，重啟數據庫
[mysql@db2 mysql5718]$ /home/mysql/mysql5718/bin/mysqladmin shutdown -u root -p
[mysql@db2 mysql5718]$ /home/mysql/mysql5718/bin/mysqld_safe –defaults-file=/home/mysql/mysql5718/my.cnf –socket=/mysql/data/mysql.sock

7、登錄數據庫檢查升級狀態：
[mysql@db2 bin]$ mysql -u root -p
Enter password:
ERROR 2002 (HY000): Can t connect to local MySQL server through socket /tmp/mysql.sock (2)
有時候我們登錄 MySQL 的時候會出現上面的錯誤，可是我們已經在配置文件指定了 mysql.sock 的目錄呀，為什么還去找別的目錄呢，解決方法有兩種：
第一在 my.cnf 配置文件添加下面的信息：（有時候不管用，比如我們上面的配置文件已經添加了可是還是報錯）
[mysql]
socket = /mysql/data/mysql.sock

第二種：我們做個軟連接到 tmp 下就可以了：
[mysql@db2 bin]$ ln -s /mysql/data/mysql.sock /tmp/mysql.sock
做完軟連接后，我們再等了數據庫就 OK 了：
[mysql@db2 bin]$ mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.18-log MySQL Community Server (GPL)

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type help; or \h for help. Type \c to clear the current input statement.

mysql \s
————–
mysql Ver 14.14 Distrib 5.6.30, for Linux (x86_64) using EditLine wrapper

Connection id: 3
Current database:
Current user: root@localhost
SSL: Not in use
Current pager: stdout
Using outfile:
Using delimiter: ;
Server version: 5.7.18-log MySQL Community Server (GPL)
Protocol version: 10
Connection: Localhost via UNIX socket
Server characterset: utf8
Db characterset: utf8
Client characterset: utf8
Conn. characterset: utf8
UNIX socket: /tmp/mysql.sock
Uptime: 4 min 16 sec

Threads: 1 Questions: 6 Slow queries: 0 Opens: 110 Flush tables: 1 Open tables: 25 Queries per second avg: 0.023
————–

mysql select version();
+————+
| version() |
+————+
| 5.7.18-log |
+————+
1 row in set (0.39 sec)

mysql

######################################################################

知識擴展：
關閉：innodb_fast_shutdown=

0：完成所有的 full purge 和 merge insert buffer 操作(如：做 InnoDB plugin 升級時)
1：默認，不需要完成上述操作，但會刷新緩沖池中的臟頁
2：不完成上述兩個操作，而是將日志寫入日志文件，下次啟動時，會執行恢復操作 recovery
沒有正常地關閉數據庫(如：kill 命令)/innodb_fast_shutdown= 2 時，需要進行恢復操作。

恢復：innodb_force_recovery=

0：默認，但需要恢復時執行所有恢復操作
1：忽略檢查到的 corrupt 頁
2：阻止主線程的運行，如主線程需要執行 full purge 操作，會導致 crash
3：不執行事務回滾操作
4：不執行插入緩沖的合并操作
5：不查看撤銷日志 undo log，InnoDB 存儲引擎會將所有未提交的事務視為已提交
6：不執行前滾的操作

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