Martin Simmons wrote:
>>>>>> On Thu, 18 Jun 2009 17:11:04 +0200, Michel Meyers said:
>>>>>>
>> Martin Simmons wrote:
>>
>>>>>>>> On Wed, 17 Jun 2009 13:48:58 +0200, Tom Sommer said:
>>>>>>>>
>>>> Martin Simmons wrote:
>>>>
>>>>>>>>>> On Tue, 16 Jun 2009 15:05:18 +0200, Tom Sommer said:
>>>>>>>>>>
>>>>>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> I have a somewhat pressing problem with the performance of my Bacula
>>>>>> installation.
>>>>>>
>>>>>> My MySQL database currently holds 247,342,127 (36GB) records in the File
>>>>>> table, and 78,576,199 (10GB) records in the Filename table.
>>>>>>
>>>>>> Since 3.0.0, but even more since 3.0.1, I have a problem with queries
>>>>>> being really slow. Basically when doing a full backup of a server
>>>>>> (mailserver, LOTS of small files), I can have my MySQL hanging for up to
>>>>>> 24+ hours on queries like this:
>>>>>>
>>>>>> INSERT INTO Filename( Name )
>>>>>> SELECT a.Name
>>>>>> FROM (
>>>>>>
>>>>>> SELECT DISTINCT Name
>>>>>> FROM batch
>>>>>> ) AS a
>>>>>> WHERE NOT
>>>>>> EXISTS (
>>>>>>
>>>>>> SELECT Name
>>>>>> FROM Filename AS f
>>>>>> WHERE f.Name = a.Name
>>>>>> )
>>>>>>
>> [...]
>>
>>>>> Sorry, I don't know how to optimize it.
>>>>>
>>>>> These queries are part of the new "batch insert" code. You can turn that
>>>>> off
>>>>> by passing --disable-batch-insert to configure when building Bacula.
>>>>>
>>>>>
>>>> what does this mean in practice? 1 query per file? or?
>>>>
>>> The non-batch approach makes several queries per file.
>>>
>> But it will do so as it backs up the files, as opposed to the batch
>> approach where it collects all the queries and does them at the end of
>> the job, right?
>>
>
> Yes, but if you have spooling turned on, then it will spool the attributes too
> and insert them all at the end using several queries per file.
>
Well, the problem is really that first is spends time storing the files,
and then it spends time saving information about the backup in the database.
It would make more sense, for larger clients, to spend the idle database
time (while taking the file backup) more wisely.
I'm having a hard time judging if turning off batch-inserts is the right
action, if I would gain anything from this.
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