1. 使用-r/-i參數
使用mysqladmin extended-status命令可以獲得所有MySQL性能指標，即show global status的輸出，不過，因為多數這些指標都是累計值，如果想了解當前的狀態，則需要進行一次差值計算，這就是mysqladmin extended-status的一個額外功能，非常實用。默認的，使用extended-status，看到也是累計值，但是，加上參數-r(--relative)，就可以看到各個指標的差值，配合參數-i(--sleep)就可以指定刷新的頻率，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，我們就有：
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. 配合簡單的awk使用
使用awk，同時輸出時間信息：
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. 配合復雜一點的awk
反正也不簡單了，那就更復雜一點，這樣讓輸出結果更友好點，因為awk不支持動態變量，所以代碼看起來比較復雜：
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
就這樣了，這幾個命令自己用的比較多，隨手分享出來。
