how to get load time in milliseconds or microseconds in mysql

I' ve searched and sear开发者_如何学Goched, but I wasn't able to find an easy way to get this:

Query OK, 50000 rows affected (0.35 sec) 

in milliseconds or microseconds.

How can I achieve it?

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I came with the same problem, I did my queries from a linux console using time

$ time mysql --user="user" -D "DataBase" -e "SELECT SQL_NO_CACHE COUNT(1) FROM table"

 ------------
 count(1)
 ------------
 750
 ------------

 real 0m0.269s
 user 0m0.014s
 sys  0m0.015s

or

$ time -f"%e" mysql --user="user" -D "DataBase" -e "SELECT SQL_NO_CACHE COUNT(1) FROM table"

------------
 count(1)
------------
 750
------------
 0.24

It gives different values from "mysql" but at least is something you can work with, for example this script:

#!/bin
temp = 1
while [ $temp -le 1000]
do
    /usr/bin/time -f"%e" -o"/home/admin/benchmark.txt" -a mysql --user="user" -D "DataBase" -e "SELECT SQL_NO_CACHE COUNT(1) FROM table"  > /dev/null 2> /dev/null
    let temp=$temp+1
done

Execute the query 1000 times, -f shows only the real time, -o the output file, -a appends to the output, > /dev/null 2> /dev/null ignores the query output so it doesn't print in console each time.

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That time's calculated by the mysql monitor application and isn't done by the mysql server. It's not something you can retrieve programatically by doing (say) select last_query_execution_time() (which would be nice).

You can simulate it in a coarse way by doing the timing in your application, by taking system time before and after calling the query function. Hopefully the client-side overhead would be minimal compared to the mysql portion.

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You could time it yourself in the code that runs the query:

Pseudo code:

double StartTime = <now>
Execute SQL Query 
double QueryTime = <now> - StartTime