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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 ;/
}/
if($2 ~ /questions|queries|innodb_rows|com_select |com_insert |com_update |com_delete |innodb_buffer_pool_read_requests/)/
print $2 $3;/
}'
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
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
就这样了，这几个命令自己用的比较多，随手分享出来。
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