mysql DBA: Summary of common mysqladmin commands
- 2020-06-12 10:48:26
- OfStack
1. Use the -ES1en / -i parameter
Using the mysqladmin ES5en-ES6en command, you can get all of the MySQL performance metrics, the output of show global status, but because most of these metrics are cumulative values, you need to do a difference calculation if you want to know the current state. This is an additional useful feature of mysqladmin ES12en-ES13en. By default, extended-ES15en is used, which is also the cumulative value. However, with the parameter -ES16en (--relative), you can see the difference of each indicator. With the parameter -ES18en (--sleep), you can specify the frequency of the refresh.
mysqladmin -uroot -r -i 1 -pxxx extended-status
+------------------------------------------+----------------------+
| Variable_name | Value |
+------------------------------------------+----------------------+
| Aborted_clients | 0 |
| Com_select | 336 |
| Com_insert | 243 |
......
| Threads_created | 0 |
+------------------------------------------+----------------------+2. Use with grep
With the use of grep, we have:
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. Use with simple awk
Use awk and output time information:
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 14. awk with 1 point complexity
It's not that simple anyway, so it's a little more complicated 1, which makes the output a little friendlier, because awk doesn't support dynamic variables, so the code looks a little more complicated:
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 That's it. I use these commands a lot and share them with you.