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From:Aveek Misra Date:May 25 2011 10:34am
Subject:Re: MySQL server has gone away
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Nothing in the error log or the slow query log that suggests that the query size is too
large or us taking too much time to execute.

Thanks
Aveek

On May 25, 2011, at 3:53 PM, Rik Wasmus wrote:

>> failed to execute "        SELECT * FROM cluster_info WHERE cluster = ?":
>> MySQL server has gone away
>> 
>> The error "MySQL server has gone away" is the error from the db handle. Can
>> anyone give me any pointers on why that happens? I looked up the
>> documentation in MySQL docs and the most common reason seems to be that it
>> happens if the query size is very large or if there is a timeout. None of
>> them seems to be a probable cause. The "max_allowed_packet" on the server
>> is 16 MB and as can be seen in the query above, the query is very small
>> and nowhere near the size limit. We also have a timeout setting
>> (wait_timeout) of 10 minutes and the above query for us cannot possibly
>> take that amount of time. In any case, given the same query, it executes
>> correctly 99% of time (so to speak). It fails intermittently with the
>> above error. What possibly could be the reason? I also looked at the max
>> connections on the server at that time (around ~80) and it is much less
>> than the limit we have (limit is 1000). How can I extract more information
>> when this happens? This error message sucks since it does not tell me what
>> exactly happened. The server version is 5.1.45.
> 
> Can you access the error log of the server? That can probably shed more light 
> on the issue...
> -- 
> Rik Wasmus
> 
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Thread
MySQL server has gone awayAveek Misra25 May
  • Re: MySQL server has gone awayRik Wasmus25 May
    • Re: MySQL server has gone awayAveek Misra25 May
      • Re: MySQL server has gone awayPrabhat Kumar26 May
        • Re: MySQL server has gone awayClaudio Nanni27 May
          • Re: MySQL server has gone awayars k31 May
            • Re: MySQL server has gone awaychandrudba31 May
          • Re: MySQL server has gone awaychandrudba31 May