(转)使用mysqladmin ext懂得MySQL运行状态

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(转)使用mysqladmin ext了解MySQL运行状态
http://www.orczhou.com/index.php/2014/03/some-tricky-about-mysqladmin-extended-status/

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。

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 -uroot -r -i 1 -pxxx extended-status
+------------------------------------------+----------------------+
| Variable_name                            | Value                |
+------------------------------------------+----------------------+
| Aborted_clients                          | 0                    |
| Com_select                               | 336                  |
| Com_insert                               | 243                  |
......
| Threads_created                          | 0                    |
+------------------------------------------+----------------------+

2. 配合grep使用
配合grep使用,我们就有:
mysqladmin -uroot -r -i 1 -pxxx extended-status /
|grep "Questions/|Queries/|Innodb_rows/|Com_select /|Com_insert /|Com_update /|Com_delete "
| Com_delete                               | 1                    |
| Com_delete_multi                         | 0                    |
| Com_insert                               | 321                  |
| Com_select                               | 286                  |
| Com_update                               | 63                   |
| Innodb_rows_deleted                      | 1                    |
| Innodb_rows_inserted                     | 207                  |
| Innodb_rows_read                         | 5211                 |
| Innodb_rows_updated                      | 65                   |
| Queries                                  | 2721                 |
| Questions                                | 2721                 |

3 3. 配合简单的awk使用
使用awk,同时输出时间信息:

mysqladmin -uroot -p -h127.0.0.1 -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;/
}'
<-------------    12:38:49    ------------->
Com_delete                             0
Com_insert                             0
Com_select                             0
Com_update                             0
Innodb_buffer_pool_read_requests       589
Innodb_rows_deleted                    0
Innodb_rows_inserted                   2
Innodb_rows_read                       50
Innodb_rows_updated                    50
Queries                                105
Questions                              1
<-------------    12:38:50    ------------->
Com_delete                             0
Com_insert                             0
Com_select                             0
Com_update                             0
Innodb_buffer_pool_read_requests       1814
Innodb_rows_deleted                    0
Innodb_rows_inserted                   0
Innodb_rows_read                       8
Innodb_rows_updated                    8
Queries                                17
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 -P3306 -uroot -p -h127.0.0.1 -r -i 1 ext |/
awk -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
10:37:13 |     2231|   274    214     70      0|  4811      160      71       0|      4146           0
10:37:14 |     2972|   403    256     84     23|  2509      173      85      23|      4545           0
10:37:15 |     2334|   282    232     66      1|  1266      154      67       1|      3543           0
10:37:15 |     2241|   271    217     66      0|  1160      129      66       0|      2935           0
10:37:17 |     2497|   299    224     97      0|  1141      149      95       0|      3831           0
10:37:18 |     2871|   352    304     74     23|  8202      226      73      23|      6167           0
10:37:19 |     2441|   284    233     82      0|  1099      121      78       0|      3292           0
10:37:20 |     2342|   279    242     61      0|  1083      224      61       0|      3366           0

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