Linux中使用mysqladmin extended-status配合Linux命令查看MySQL运行状态_MySQL
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。
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:
代码如下:
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,我们就有:
代码如下:
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. 配合简单的awk使用
使用awk,同时输出时间信息:
代码如下:
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:
代码如下:
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);\
}}'
代码如下:
----------|---------|--- 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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