>>>>> 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.

__Martin

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