MySQL查看当前用户、存储引擎、日志

#查看MySQL的当前用户

mysql> SELECT USER();
+----------------+
| USER()         |
+----------------+
| root@localhost |
+----------------+
1 row in set (0.00 sec)

#查看所有用户

mysql> SELECT user,host,password FROM 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 rows in 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。

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

#查看数据库是否启用了log_bin

mysql> show variables like '%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 rows in set (0.00 sec)

#查看当前写入的日志

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

根据/etc/my.cnf 找到日志的配置路径

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

查看日志内容

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

　　

#查看MySQL支持的字符集

mysql> show character set ;

#查看默认字符集

mysql> show variables like '%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 rows in set (0.00 sec)

#查看某一库的字符集

mysql> show create database test;
+----------+---------------------------------------------------------------+
| Database | Create Database                                               |
+----------+---------------------------------------------------------------+
| test     | CREATE DATABASE `test` /*!40100 DEFAULT CHARACTER SET utf8 */ |
+----------+---------------------------------------------------------------+
1 row in set (0.00 sec)

查看某一表的字符集

mysql> show create table test.t1 G
*************************** 1. row ***************************
       Table: t1
Create Table: CREATE TABLE `t1` (
  `user` char(16) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL DEFAULT '',
  `host` char(60) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL DEFAULT '',
  `password` char(41) CHARACTER SET latin1 COLLATE latin1_bin NOT NULL DEFAULT ''
) ENGINE=MyISAM DEFAULT CHARSET=utf8
1 row in set (0.00 sec)

#修改字符集

mysql>alter database mydb character set utf-8;

#可以直接在配置文件中做添加，然后重启服务

[client]
character_set_server = utf8

[mysqld]
character_set_server = utf8