mysql语句怎么看 mysql怎么查看数据类型

如何看mysql执行的sql语句

1先通过status命令查看Mysql运行状态

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mysql status;

--------------

mysql Ver 14.14 Distrib 5.1.73, for redhat-linux-gnu (x86_64) using readline 5.1

Connection id: 113752

Current database: information_schema

Current user: push_user@localhost

SSL: Not in use

Current pager: stdout

Using outfile: ''

Using delimiter: ;

Server version: 5.1.73 Source distribution

Protocol version: 10

Connection: Localhost via UNIX socket

Server characterset: latin1

Db characterset: utf8

Client characterset: latin1

Conn. characterset: latin1

UNIX socket: /tmp/mysql.sock

Uptime: 22 days 8 hours 31 min 23 sec

Threads: 38 Questions: 1037751897 Slow queries: 2356 Opens: 79836

Flush tables: 1 Open tables: 64 Queries per second avg: 537.282

--------------

在上面显示列表的最后一条，我们来查看Slow queries这一项的值，如果多次查看的值大于0的话,说明有些查询sql命令执行时间过长。

2)这时再通过show processlist命令来查看当前正在运行的SQL，从中找出运行慢的SQL语句，找到执行慢的语句后，再用explain命令查看这些语句的执行计划。

mysql show processlist;

+--------+-----------+---------------------+--------------------+---------+-------+-------+------------------+

| Id | User | Host | db | Command | Time | State | Info |

+--------+-----------+---------------------+--------------------+---------+-------+-------+------------------+

| 50270 | ambari | DataBase-01:41512 | ambari | Sleep | 23 | | NULL |

| 50271 | ambari | DataBase-01:41511 | ambari | Sleep | 6 | | NULL |

| 50272 | ambari | DataBase-01:41514 | ambari | Sleep | 23 | | NULL |

| 62452 | oozie | DataBase-02:42987 | oozie | Sleep | 25 | | NULL |

| 63660 | ambari | DataBase-01:56052 | ambari | Sleep | 0 | | NULL |

| 110404 | push_user | localhost:33817 | quartz | Sleep | 12 | | NULL |

| 112835 | push_user | localhost:46571 | hibernate | Sleep | 1 | | NULL |

| 113163 | push_user | localhost:56585 | hibernate | Sleep | 1 | | NULL |

| 113289 | push_user | 14.118.132.20:47333 | DW | Sleep | 628 | | NULL |

| 113320 | push_user | localhost:47428 | hibernate | Sleep | 3 | | NULL |

| 113321 | push_user | localhost:47429 | hibernate | Sleep | 3 | | NULL |

| 113322 | push_user | localhost:47430 | hibernate | Sleep | 3 | | NULL |

| 113357 | push_user | localhost:52337 | hibernate | Sleep | 3 | | NULL |

| 113364 | push_user | localhost:57206 | hibernate | Sleep | 3 | | NULL |

| 113366 | push_user | localhost:34813 | hibernate | Sleep | 1 | | NULL |

| 113398 | push_user | localhost:37382 | hibernate | Sleep | 1 | | NULL |

| 113498 | push_user | localhost:47626 | quartz | Sleep | 12717 | | NULL |

| 113709 | push_user | localhost:59382 | hibernate | Sleep | 1 | | NULL |

| 113710 | push_user | localhost:33627 | hibernate | Sleep | 1 | | NULL |

| 113715 | hive | DataBase-02:54968 | hive | Sleep | 2390 | | NULL |

| 113716 | hive | DataBase-02:54969 | hive | Sleep | 2390 | | NULL |

| 113717 | hive | DataBase-02:54974 | hive | Sleep | 2336 | | NULL |

| 113718 | hive | DataBase-02:54975 | hive | Sleep | 2336 | | NULL |

| 113719 | push_user | localhost:48243 | hibernate | Sleep | 1 | | NULL |

| 113720 | push_user | localhost:48245 | hibernate | Sleep | 1 | | NULL |

| 113721 | push_user | localhost:48244 | hibernate | Sleep | 1 | | NULL |

| 113722 | push_user | localhost:48247 | hibernate | Sleep | 1 | | NULL |

| 113723 | push_user | localhost:48249 | hibernate | Sleep | 1 | | NULL |

| 113724 | push_user | localhost:48248 | hibernate | Sleep | 1 | | NULL |

| 113745 | push_user | localhost:50684 | hibernate | Sleep | 1 | | NULL |

| 113746 | push_user | localhost:50685 | hibernate | Sleep | 1 | | NULL |

| 113747 | push_user | localhost:50695 | hibernate | Sleep | 1 | | NULL |

| 113748 | push_user | localhost:50696 | hibernate | Sleep | 1 | | NULL |

| 113749 | push_user | localhost:50697 | hibernate | Sleep | 1 | | NULL |

| 113750 | push_user | localhost:50699 | hibernate | Sleep | 1 | | NULL |

| 113751 | push_user | localhost:50700 | hibernate | Sleep | 1 | | NULL |

| 113752 | push_user | localhost | information_schema | Query | 0 | NULL | show processlist |

| 113753 | push_user | 14.118.132.20:28688 | DW | Sleep | 396 | | NULL |

+--------+-----------+---------------------+--------------------+---------+-------+-------+------------------+

38 rows in set (0.00 sec)

或者通过如下命令查询:

mysql use information_schema;

mysql select * from PROCESSLIST where info is not null;

+--------+-----------+-----------+--------------------+---------+------+-----------+--------------------------------------------------+

| ID | USER | HOST | DB | COMMAND |

TIME | STATE | INFO |

+--------+-----------+-----------+--------------------+---------+------+-----------+--------------------------------------------------+

| 113752 | push_user | localhost | information_schema | Query |

0 | executing | select * from PROCESSLIST where info is not null |

+--------+-----------+-----------+--------------------+---------+------+-----------+--------------------------------------------------+

1 row in set (0.00 sec)

如何查看mysql执行过的语句

开启记录MySQL执行过SQL语句的方法很简单：编辑/etc/my.cnf文件，在[mysqld]节下面添加：log=/var/lib/mysql/sql_row.log行（日志的路径自己根据需要定义）。

[mysqld]

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

user=mysql

# Default to using old password format for compatibility with mysql 3.x

# clients (those using the mysqlclient10 compatibility package).

old_passwords=1

log=/var/lib/mysql/sql_row.log

# Disabling symbolic-links is recommended to prevent assorted security risks;

# to do so, uncomment this line:

# symbolic-links=0

[mysqld_safe]

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

修改完毕后，记得重启 MySQL：

service mysql restart

# 或者

/etc/init.d/mysqld stop

/etc/init.d/mysqld start

现在你去 /var/lib/mysql/ 路径下的 sql_row.log 文件应该是能够看到 MySQL 什么时候执行了哪些程序了。

如何查看mysql中执行sql语句

如果我的理解没错的话，你的意思是正在执行的sql语句吧，

命令：

mysqlshow full processlist;

示例：

mysqlselect sleep(20);

另一个session执行：

mysqlshow full processlist;

--- 可以看到正在执行的语句 ---

| 183 | root | localhost | NULL | Query | 6 | User sleep | select sleep(20) |