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From:Suresh Kuna Date:September 1 2012 8:02am
Subject:Re: Understanding Slow Query Log
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Disable log-queries-not-using-indexes to log only queries > 100 sec.

Just do "> /var/lib/mysql/slow-queries.log" it will clear the log.

On Sat, Sep 1, 2012 at 12:34 PM, Adarsh Sharma <eddy.adarsh@stripped>wrote:

> Hi all,
>
> I am using Mysql Ver 14.14 Distrib 5.1.58 in which i enabled slow query log
> by setting below parameters in my.cnf :
>
> log-slow-queries=/usr/local/mysql/slow-query.log
> long_query_time=100
> log-queries-not-using-indexes
>
> I am assuming from the inf. from the internet that long_query_time is in
> seconds , but i see the slow query log ,  there are lots of statements (
> queries ) :
>
> # User@Host: user1[user1] @ abc.dd.aa.com [192.112.111.111]
> # Query_time: 0.052784  Lock_time: 0.000043 Rows_sent: 1  Rows_examined:
> 141145
> SET timestamp=1346409734;
> select count(ENTITY_NAME) from ALERT_EVENTS where EVENT_TIME >
> date_sub(now(),INTERVAL 60 MINUTE) and status=upper('failed') and
> ENTITY_NAME='FETL-ImpressionRC-conversion';
> # Time: 120831 10:43:14
> # User@Host: user1[user1] @ abc.dd.aa.com [192.112.111.111]
> # Query_time: 0.053599  Lock_time: 0.000079 Rows_sent: 1  Rows_examined:
> 141145
> SET timestamp=1346409794;
> select count(ENTITY_NAME) from ALERT_EVENTS where EVENT_TIME >
> date_sub(now(),INTERVAL 60 MINUTE) and status=upper('failed') and
> ENTITY_NAME='FETL-click-enhancer-deferred';
> # User@Host: user1[user2] @ abc.dd.aa.com [192.112.111.111]
> # Query_time: 0.054185  Lock_time: 0.000086 Rows_sent: 1  Rows_examined:
> 141145
> SET timestamp=1346409794;
> select count(ENTITY_NAME) from ALERT_EVENTS where EVENT_TIME >
> date_sub(now(),INTERVAL 60 MINUTE) and status=upper('failed') and
> ENTITY_NAME='FETL-ImpressionRC-conversion';
> # Time: 120831 10:43:22
> # User@Host: user2[user2] @ abc.dd.aa.com [192.112.111.111]
> # Query_time: 0.000163  Lock_time: 0.000045 Rows_sent: 1  Rows_examined: 13
>
>
>
> I don't  understand the query time unit in slow query log because i expect
> queries to be logged that takes > 100 s. I tested with sleep command for
> 60s , it doesn't logged in slow query log and when i sleep for 120 s it
> logged but i don't why the other queries are logging in slow log.
>
> # Query_time: 120.000259  Lock_time: 0.000000 Rows_sent: 1  Rows_examined:
> 0
> SET timestamp=1346443103;
> SELECT SLEEP(120);
>
> And also my slow log is increasing and decided to purge thorogh below
> command :
>
> cat /dev/null > /var/lib/mysql/slow-queries.log
>
>
> Anyone any ideas about this.
>
>
> Thanks
>



-- 
Thanks
Suresh Kuna
MySQL DBA

Thread
Understanding Slow Query LogAdarsh Sharma1 Sep
  • Re: Understanding Slow Query Logyoku ts1 Sep
  • Re: Understanding Slow Query LogSuresh Kuna1 Sep
    • RE: Understanding Slow Query LogRick James4 Sep
      • Re: Understanding Slow Query LogAdarsh Sharma5 Sep
        • Re: Understanding Slow Query LogManuel Arostegui5 Sep
          • Re: Understanding Slow Query LogAdarsh Sharma5 Sep
Re: Understanding Slow Query LogAdarsh Sharma5 Sep
  • RE: Understanding Slow Query LogRick James5 Sep
    • Re: Understanding Slow Query LogAndy Wallace5 Sep
      • RE: Understanding Slow Query LogRick James5 Sep
        • Re: Understanding Slow Query LogAndy Wallace5 Sep