MySQL查看当前用户、存储引擎、日志

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#查看MySQL的当前用户

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mysql> SELECTUSER();
+----------------+
| USER() |
+----------------+
| root@localhost |
+----------------+
1 row inset (0.00 sec)

#查看所有用户

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mysql> SELECTuser,host,passwordFROM mysql.user;
+---------+-------------+-------------------------------------------+
| user| host | password|
+---------+-------------+-------------------------------------------+
| root | localhost | *7AE39BE5035D5C32361400FF7DEDD757AA76896A |
| root | 10.4.5.9 | *7AE39BE5035D5C32361400FF7DEDD757AA76896A |
| root | 127.0.0.1 | *7AE39BE5035D5C32361400FF7DEDD757AA76896A |
| gechong | 10.4.14.168 | *11B9ACA21786F766739D0EB1483C5F64212B81AC |
+---------+-------------+-------------------------------------------+
4 rowsin set (0.00 sec)

#查看当前数据库版本，版本5.5一下默认的存储引擎并非是InnoDB，如果需要可以手动修改。

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mysql> select@@version ;
+------------+
| @@version |
+------------+
| 5.1.73-log |
+------------+
1 row inset (0.00 sec)

#查看数据库是否启用了log_bin

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mysql> show variableslike '%log_bin%';
+---------------------------------+-------+
| Variable_name | Value |
+---------------------------------+-------+
| log_bin | ON |
| log_bin_trust_function_creators |OFF |
| log_bin_trust_routine_creators |OFF |
| sql_log_bin | ON |
+---------------------------------+-------+
4 rowsin set (0.00 sec)

#查看当前写入的日志

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mysql> show master status ;
+----------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+----------------+----------+--------------+------------------+
| log-bin.000002 | 231 | test | |
+----------------+----------+--------------+------------------+
1 row inset (0.00 sec)

根据/etc/my.cnf 找到日志的配置路径

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log-bin = /var/lib/mysql/log-bin

查看日志内容

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[root@10-4-14-168 ~]# mysqlbinlog /var/lib/mysql/log-bin.000002

#查看MySQL支持的字符集

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mysql> show character set ;

#查看默认字符集

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mysql> show variableslike '%char%';
+--------------------------+----------------------------+
| Variable_name | Value |
+--------------------------+----------------------------+
| character_set_client | latin1 |
| character_set_connection | latin1 |
| character_set_database | utf8 |
| character_set_filesystem |binary |
| character_set_results | latin1 |
| character_set_server | utf8 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rowsin set (0.00 sec)

#查看某一库的字符集

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mysql> show create databasetest;
+----------+---------------------------------------------------------------+
| Database| Create Database |
+----------+---------------------------------------------------------------+
| test | CREATEDATABASE `test` /*!40100 DEFAULT CHARACTER SET utf8 */|
+----------+---------------------------------------------------------------+
1 row inset (0.00 sec)

查看某一表的字符集

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mysql> show create table test.t1 \G
*************************** 1. row ***************************
Table: t1
Create Table: CREATETABLE `t1` (
`user`char(16) CHARACTERSET utf8 COLLATEutf8_bin NOT NULL DEFAULT '',
`host`char(60) CHARACTERSET utf8 COLLATEutf8_bin NOT NULL DEFAULT '',
`password`char(41) CHARACTERSET latin1 COLLATElatin1_bin NOT NULL DEFAULT ''
) ENGINE=MyISAM DEFAULT CHARSET=utf8
1 row inset (0.00 sec)

#修改字符集

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mysql>alterdatabase mydb characterset utf-8;

#可以直接在配置文件中做添加，然后重启服务

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[client]
character_set_server = utf8
[mysqld]
character_set_server = utf8

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