使用mysqladmin检测MySQL运行状态的教程_MySQL

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 -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. 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)%20 == 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

就这样了，这几个命令自己用的比较多，随手分享出来。