Re: I'm killing my database
Re: I'm killing my database
- Subject: Re: I'm killing my database
- From: Scott Winn <email@hidden>
- Date: Wed, 25 Apr 2007 12:03:52 -0700
Thanks Chuck. I will give it a look.
I still don't know what the problem was, but I have updated FrontBase and its plugin (I was a few point releases behind). The release notes for some of those points included delete fixes. I also added EC.undoManager().removeAllActions(). I haven't disposed of the editing context yet, but I may once I have checked the performance results from my most recent run.
I put the same data back through the importer and no DB crash this time, although things still seemed very slow. More than 1/2 an hour to process about 1 MB of data seem like a bit much. I checked free memory just prior to doing the delete and it never dips below 74%.
Scott
On Apr 24, 2007, at 10:32 PM, Guido Neitzer wrote:
On 24.04.2007, at 20:59, Chuck Hill wrote:
The first thing I would do is to add this line: recordContext .undoManager().removeAllActions();
The next thing I would do (voodoo or not) is to periodically dispose of recordContext and create a replacement. In the past that was vital.
It still is. It helps. Not necessarily for performance but normally for memory usage. I normally do bulk import in batches of up to 500 objects per batch, then save and dispose the editingContext, set it to null and create in new one in the next batch. Also for bulk updating of EOs.
That works well for my importers.
If you need to resolve relationships during import, pre-fetching the relationships can make a huge difference.
As as you are deleting, I have a DeletePrefetcher class that may be of use. I originally wrote this as a bug workaround, but it might also make the fetches more efficient. It is part of our GVCEOFExtensions framework that you can get from http:// sourceforge.net/projects/gvcsitemaker
To save you the download, I have temporarily stuck a copy here:
Chuck
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Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems.
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