mysqladmin是MySQL一個重要的客戶端，最常見的是使用它來關閉數據庫，除此，該命令還可以了解MySQL運行狀態、進程信息、進程殺死等。本文介紹一下如何使用mysqladmin extended-status(因為沒有"歧義"，所以可以使用ext代替)了解MySQL的運行狀態。
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：
復制代碼 代碼如下:
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：
復制代碼 代碼如下:
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：
復制代碼 代碼如下:
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：
復制代碼 代碼如下:
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);\
}}'
復制代碼 代碼如下:
----------|---------|--- 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
就這樣了，這幾個命令自己用的比較多，隨手分享出來。
本文標題: Linux中使用mysqladmin extended-status配合Linux命令查看MySQL運行狀態
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