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 ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
