标签：sha ror var hang involve network password lock existing
In-Place Upgrade: Involves shutting down the old MySQL version, replacing the old MySQL binaries or packages with the new ones, restarting MySQL on the existing data directory, and running mysql_upgrade.
Logical Upgrade: Involves exporting existing data from the old MySQL version using mysqldump, installing the new MySQL version, loading the dump file into the new MySQL version, and running mysql_upgrade.
MySQL5.7.11，此参数的默认值为keyring_file（是一个二进制文件的插件），InnoDB表空间在初始化InnoDB之前需要此插件来加密，但是MySQL5.7.12及以后此参数默认为空，所以5.7.11升级到5.7.12后，如果已经在之前的版本中使用此插件对InnoDB表空间进行了加密，在开启服务时需要指定参数 --early-plugin-load
系统表MySQL5.6中INFORMATION_SCHEMA 中存在系统变量和状态变量的表，show variables 和show status也是基于此库中的表，在5.7.6时被Performance Schema也存在这四张表，show 语句开始基于Performance Schema中的表，如果show_compatibility_56参数开启，则兼容5.6
下面的测试库是从MySQL5.6版本中直接物理恢复到MySQL5.7环境下的
mysql> select version();
+------------+
| version() |
+------------+
| 5.7.10-log |
+------------+
1 row in set (0.00 sec)
mysql> show variables like ‘%56%‘;
ERROR 1146 (42S02): Table ‘performance_schema.session_variables‘ doesn‘t exist
mysql> use performance_schema;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> show tables like ‘%variable%‘;
Empty set (0.00 sec)
mysql> set global show_compatibility_56=ON;
Query OK, 0 rows affected (0.00 sec)
mysql> show variables like ‘%56%‘;
+-----------------------------+-------+
| Variable_name | Value |
+-----------------------------+-------+
| sha256_password_proxy_users | OFF |
| show_compatibility_56 | ON |
+-----------------------------+-------+
2 rows in set (0.00 sec)
ONLY_FULL_GROUP_BY, STRICT_TRANS_TABLES, NO_ENGINE_SUBSTITUTION默认开启
如以下sql在only full group by下，name非聚集字列，如果不在乎返回的address的值是否准确，则可以使用ANY_VALUE函数，这样address字段就无需满足full group by 出现在group by 中
SELECT name, ANY_VALUE(address), MAX(age) FROM t GROUP BY name;
mysql.user的password字段在5.7.6中已去除，认证信息记录在authentication_string中，运行in-place upgrade 迁移password列值到authentication_string
如果是通过logical upgrade，需要注意：
You must include the --add-drop-table option
You must not include the --flush-privileges option
server端的更改
MySQL5.7.5开始mysql_old_password 插件被移除
secure-auth 系统变量仅支持值1
--skip-secure-auth 选项被弃用
old_password系统变量的值1（将密码hash为41位的hash值）不再被允许
old_password ()函数被移除
字段类型YEAR(2)被更改为YEAR(4)
MySQL5.7.2开始mysql.user系统表中的plugin字段不允许为空，运行mysql_upgrade会进行如下操作
UPDATE mysql.user SET plugin = ‘mysql_native_password‘
WHERE plugin = ‘‘ AND (Password = ‘‘ OR LENGTH(Password) = 41);
FLUSH PRIVILEGES;
需要注意sql_mode的变更，如：
mysql> SET sql_mode = ‘‘;
Query OK, 0 rows affected (0.00 sec)
mysql> CREATE TABLE t (d DATE DEFAULT 0);
SET sql_mode = ‘NO_ZERO_DATE,STRICT_ALL_TABLES‘;
INSERT INTO t (d) VALUES(DEFAULT);Query OK, 0 rows affected (0.52 sec)
mysql> SET sql_mode = ‘NO_ZERO_DATE,STRICT_ALL_TABLES‘;
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> INSERT INTO t (d) VALUES(DEFAULT);
ERROR 1292 (22007): Incorrect date value: ‘0000-00-00‘ for column ‘d‘ at row 1
SQL变更
MySQL5.7.5之前GET_LOCK()在执行第二次的额时候会释放前面获得的锁，在此版本以后支持同时获得多个锁，如：
mysql> select version();
+------------+
| version() |
+------------+
| 5.6.33-log |
+------------+
1 row in set (0.00 sec)
mysql> SELECT GET_LOCK(‘lock1‘,10);
+----------------------+
| GET_LOCK(‘lock1‘,10) |
+----------------------+
| 1 |
+----------------------+
1 row in set (0.00 sec)
mysql> SELECT GET_LOCK(‘lock2‘,10);
+----------------------+
| GET_LOCK(‘lock2‘,10) |
+----------------------+
| 1 |
+----------------------+
1 row in set (0.00 sec)
mysql> SELECT RELEASE_LOCK(‘lock2‘);
+-----------------------+
| RELEASE_LOCK(‘lock2‘) |
+-----------------------+
| 1 |
+-----------------------+
1 row in set (0.00 sec)
mysql> SELECT RELEASE_LOCK(‘lock1‘);
+-----------------------+
| RELEASE_LOCK(‘lock1‘) |
+-----------------------+
| NULL |
+-----------------------+
1 row in set (0.00 sec)
返回null说明此锁已经被释放了
http://dev.mysql.com/doc/refman/5.7/en/upgrading-from-previous-series.html
标签：sha ror var hang involve network password lock existing
原文地址：http://www.cnblogs.com/Bccd/p/5987426.html
