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
>> )
>>
>> with the status "Sending data", and a lot of other similar queries in
>> queue with the status "Locked". One of these queries take approx 10.000
>> seconds to execute, but is just followed by another similar (identical)
>> query with the same duration. This is a problem mostly because it
>> prevents me doing restores while backups are "Dir inserting attributes"
>>
>> Obviously I would think it's a MySQL performance issue, but I was
>> wondering if anything had been done to the queries? They seem to be a
>> LOT slower and a LOT heavier.
>> I've just put more RAM into the server, but it's done little to improve
>> the duration of the queries. My server now has 4GB RAM (will update to
>> 6GB) - but again it's a recent issue, because Bacula has been running
>> perfectly for many months on 2GB RAM, until I updated to 3.0.1
>>
>> I've done REPAIR TABLE and OPTIMIZE TABLE and seen no improvement.
>>
>> Finally if anyone have any specific ideas to improve performance on my
>> huge SQL database, please share :)
>>     
>
> 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?

My real problem is these huge queries lock the File table, so no other
jobs can touch it for many hours.

// Tom

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