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From:Claudio Nanni Date:May 11 2012 6:36pm
Subject:Re: Deadlock due lockwait. How can I tell mysql to wait longer?
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Hello Andrés

did you notice that both transactions are trying to update records with
same *accountid='3235296' *
and that they lock the same index page? *space id 5806 page no 69100 n bits
176 index*

Cheers

Claudio

2012/5/11 Andrés Tello <mr.criptos@stripped>

> Ok, so I had a deadlock...
>
> But then, why a deadlock doesn't rollback all the transaccion?
>
>
> On Fri, May 11, 2012 at 9:55 AM, Baron Schwartz <baron@stripped> wrote:
>
> > Deadlocks and lock wait timeouts are independent of one another. A
> > deadlock happens when there is a cycle in the waits-for graph. Your
> > transactions are *active* for 132 and 33 seconds, but the deadlock
> > happens at the instant the conflict is detected, not after waiting. A
> > deadlock cannot be resolved by waiting, by definition. Hence the name,
> > deadlock. The only way to resolve it is to choose a victim.
> >
> > On Fri, May 11, 2012 at 3:06 AM, Andrés Tello
> <mr.criptos@stripped>
> > wrote:
> > > Ok... I have one of those pesky error, in an application not handling
> > > deadlocks or lockwaits.
> > >
> > > The database object can't be modified to support deadlock/lockwatis...
> > > I can only change database parameteres
> > >
> > > Database info: Server version: 5.5.22-log Source distribution
> > >
> > >
> > > from show engine innodb status;
> > > {abstract}
> > > *** (1) TRANSACTION:
> > > TRANSACTION 5F7EA9A, ACTIVE 33 sec starting index read
> > > mysql tables in use 1, locked 1
> > > LOCK WAIT 13 lock struct(s), heap size 3112, 27 row lock(s)
> > > update `account` set `balance`= 0.00 + '-6.07' where
> accountid='3235296'
> > > *** (1) WAITING FOR THIS LOCK TO BE GRANTED:
> > > RECORD LOCKS space id 5806 page no 69100 n bits 176 index `PRIMARY` of
> > > table `f_database`.`account` trx id 5F7EA9A lock_mode X locks rec but
> not
> > > gap waiting
> > >
> > > *** (2) TRANSACTION:
> > > TRANSACTION 5F7A398, ACTIVE 132 sec starting index read, thread
> declared
> > > inside InnoDB 500
> > > mysql tables in use 1, locked 1
> > > 14 lock struct(s), heap size 3112, 27 row lock(s)
> > > MySQL thread id 92442, OS thread handle 0x7f903b949710, query id
> 32378480
> > > 90.0.0.51 mario Updating
> > > update `account` set `balance`= 0.00 + '-1.37' where
> accountid='3235296'
> > >
> > > *** (2) HOLDS THE LOCK(S):
> > > RECORD LOCKS space id 5806 page no 69100 n bits 176 index `PRIMARY` of
> > > table `f_database`.`account` trx id 5F7A398 lock mode S locks rec but
> not
> > > gap
> > >
> > > *** (2) WAITING FOR THIS LOCK TO BE GRANTED:
> > > RECORD LOCKS space id 5806 page no 69100 n bits 176 index `PRIMARY` of
> > > table `f_database`.`account` trx id 5F7A398 lock_mode X locks rec but
> not
> > > gap waiting
> > >
> > > *** WE ROLL BACK TRANSACTION (1)
> > >
> > > The issue is that I had a lock for over 132 seconds and the other was
> > > waiting for 33 seconds, so I get a lockwait.
> > >
> > > accountid is locked by a
> > > select balance from account where accountid='3235296' lock in shared
> mode
> > > How can I tell mysql to wait longer? I know the process which is doing
> > the
> > > deadlock, is a long balance process... I know that it takes time,
> > sometives
> > > over 15 minutes, but they always resolve...
> > >
> > > How Can I tell mysql to wait for the lock as needed? like for over 12
> > > minutes?
> > >
> > > TIA
> >
> >
> >
> > --
> > Baron Schwartz
> > Author, High Performance MySQL
> > http://www.xaprb.com/
> >
> > --
> > MySQL General Mailing List
> > For list archives: http://lists.mysql.com/mysql
> > To unsubscribe:    http://lists.mysql.com/mysql
> >
> >
>



-- 
Claudio

Thread
Deadlock due lockwait. How can I tell mysql to wait longer?Andrés Tello11 May
  • Re: Deadlock due lockwait. How can I tell mysql to wait longer?Baron Schwartz11 May
    • Re: Deadlock due lockwait. How can I tell mysql to wait longer?Andrés Tello11 May
      • Re: Deadlock due lockwait. How can I tell mysql to wait longer?Claudio Nanni11 May
        • Re: Deadlock due lockwait. How can I tell mysql to wait longer?Andrés Tello11 May
          • Re: Deadlock due lockwait. How can I tell mysql to wait longer?Claudio Nanni11 May
            • Re: Deadlock due lockwait. How can I tell mysql to wait longer?Andrés Tello11 May
      • Re: Deadlock due lockwait. How can I tell mysql to wait longer?Baron Schwartz11 May
        • Re: Deadlock due lockwait. How can I tell mysql to wait longer?Andrés Tello11 May
        • Re: Deadlock due lockwait. How can I tell mysql to wait longer?Johan De Meersman14 May
          • RE: Deadlock due lockwait. How can I tell mysql to wait longer?David Lerer14 May
Re: Deadlock due lockwait. How can I tell mysql to wait longer?Baron Schwartz14 May
  • Re: Deadlock due lockwait. How can I tell mysql to wait longer?Claudio Nanni14 May
    • Re: Deadlock due lockwait. How can I tell mysql to wait longer?Andrés Tello14 May
      • Re: Deadlock due lockwait. How can I tell mysql to wait longer?Claudio Nanni14 May
        • RE: Deadlock due lockwait. How can I tell mysql to wait longer?Rick James14 May