使用mysqladmin ext了解MySQL运行状态

摘要:

      mysqladmin是 MySQL一个重要的客户端,最常见的是使用它来关闭数据库,除此,该命令还可以了解MySQL运行状态、进程信息、进程杀死等。本文介绍一下如何使用 mysqladmin extended-status(因为没有"歧义",所以可以使用ext代替)了解MySQL的运行状态。

1. 使用-r/-i参数

      使用mysqladmin extended-status命令可以获得所有MySQL性能指标,即show global status的输出,不过,因为多数这些指标都是累计值,如果想了解当前的状态,则需要进行一次差值计算,这就是mysqladmin extended-status的一个额外功能,非常实用。默认的,使用extended-status,看到也是累计值,但是,加上参数 -r(--relative),就可以看到各个指标的差值,配合参数-i(--sleep)就可以指定刷新的频率,那么就有如下命令:

mysqladmin --no-defaults -uroot -r -i 1 -p123456 extended-status

+---------------------------------------+----------+
| Variable_name                         | Value    |
+---------------------------------------+----------+
| Aborted_clients                       | 0        |
| Aborted_connects                      | 0        |
| Binlog_cache_disk_use                 | 0        |
| Binlog_cache_use                      | 0        |
| Bytes_received                        | 35       |
| Bytes_sent                            | 7372     |
……………………
| Threads_running                       | 0        |
| Uptime                                | 1        |
| Uptime_since_flush_status             | 1        |
+---------------------------------------+----------+

2. 配合grep使用

配合grep使用,我们就有:

mysqladmin --no-defaults -uroot -p123456 -r -i 1 extended-status |grep "Questions\|Queries\|Innodb_rows\|Com_select \|Com_insert \|Com_update \|Com_delete "

| Com_delete                            | 0        |
| Com_insert                            | 0        |
| Com_select                            | 0        |
| Com_update                            | 0        |
| Innodb_rows_deleted                   | 0        |
| Innodb_rows_inserted                  | 0        |
| Innodb_rows_read                      | 0        |
| Innodb_rows_updated                   | 0        |
| Queries                               | 113      |
| Questions                             | 113      |

3. 配合简单的awk使用

使用awk,同时输出时间信息:

mysqladmin --no-defaults -uroot -p123456 -P3306 -r -i 1 ext |awk -F"|" {\
  if($2 ~ /Variable_name/){    print " <-------------    "  strftime("%H:%M:%S") "    ------------->";  }  if($2 ~ /Questions|Queries|Innodb_rows|Com_select |Com_insert |Com_update |Com_delete |Innodb_buffer_pool_read_requests/)    print $2 $3;}
 <-------------    11:37:27    ------------->
 Com_delete                             0        
 Com_insert                             0        
 Com_select                             0        
 Com_update                             0        
 Innodb_buffer_pool_read_requests       6549     
 Innodb_rows_deleted                    0        
 Innodb_rows_inserted                   0        
 Innodb_rows_read                       0        
 Innodb_rows_updated                    0        
 Queries                                131      
 Questions                              131      
 <-------------    11:37:28    ------------->
 Com_delete                             0        
 Com_insert                             0        
 Com_select                             0        
 Com_update                             0        
 Innodb_buffer_pool_read_requests       0        
 Innodb_rows_deleted                    0        
 Innodb_rows_inserted                   0        
 Innodb_rows_read                       0        
 Innodb_rows_updated                    0        
 Queries                                1        
 Questions                              1   

4. 配合复杂一点的awk

反正也不简单了,那就更复杂一点,这样让输出结果更友好点,因为awk不支持动态变量,所以代码看起来比较复杂:

mysqladmin --no-defaults -uroot -p123456 -r -i 1 ext |gawk -F"|" "BEGIN{ count=0; }"{ if($2 ~ /Variable_name/ && ++count == 1){\
    print "----------|---------|--- MySQL Command Status --|----- Innodb row operation ----|-- Buffer Pool Read --";    print "---Time---|---QPS---|select insert update delete|  read inserted updated deleted|   logical    physical";}else if ($2 ~ /Queries/){queries=$3;}else if ($2 ~ /Com_select /){com_select=$3;}else if ($2 ~ /Com_insert /){com_insert=$3;}else if ($2 ~ /Com_update /){com_update=$3;}else if ($2 ~ /Com_delete /){com_delete=$3;}else if ($2 ~ /Innodb_rows_read/){innodb_rows_read=$3;}else if ($2 ~ /Innodb_rows_deleted/){innodb_rows_deleted=$3;}else if ($2 ~ /Innodb_rows_inserted/){innodb_rows_inserted=$3;}else if ($2 ~ /Innodb_rows_updated/){innodb_rows_updated=$3;}else if ($2 ~ /Innodb_buffer_pool_read_requests/){innodb_lor=$3;}else if ($2 ~ /Innodb_buffer_pool_reads/){innodb_phr=$3;}else if ($2 ~ /Uptime / && count >= 2){  printf(" %s |%9d",strftime("%H:%M:%S"),queries);  printf("|%6d %6d %6d %6d",com_select,com_insert,com_update,com_delete);  printf("|%6d %8d %7d %7d",innodb_rows_read,innodb_rows_inserted,innodb_rows_updated,innodb_rows_deleted);  printf("|%10d %11d\n",innodb_lor,innodb_phr);}}

----------|---------|--- MySQL Command Status --|----- Innodb row operation ----|-- Buffer Pool Read --
---Time---|---QPS---|select insert update delete|  read inserted updated deleted|   logical    physical
 11:39:51 |        1|     0      0      0      0|     0        0       0       0|         0           0
 11:39:52 |        1|     0      0      0      0|     0        0       0       0|         0           0
 11:39:53 |        1|     0      0      0      0|     0        0       0       0|         0           0
 11:39:54 |        1|     0      0      0      0|     0        0       0       0|         0           0
 11:39:55 |        1|     0      0      0      0|     0        0       0       0|         0           0
 11:39:56 |        1|     0      0      0      0|     0        0       0       0|         0           0
…………
…………

这里注意,要是awk是mawk的话,会出现:function strftime never defined ,所以要用gawk。

 

本文来自:http://www.orczhou.com/index.php/2014/03/some-tricky-about-mysqladmin-extended-status/

使用mysqladmin ext了解MySQL运行状态【转】,古老的榕树,5-wow.com

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