Lucene has an API for very fast deletion of the index (ie, it removes the files): IndexWriter.deleteAll(). It's part of the transaction, ie, you still must call .commit() to make the change visible to external readers.
But I don't know whether this is exposed in Solr... Mike On Thu, Sep 23, 2010 at 8:50 AM, Jonathan Rochkind <rochk...@jhu.edu> wrote: > Because even after you've deleted every document from the index, there are > still actually index _files_ on disk taking up space. Lucene organizes it's > files for quick access, and a consequence of this is that deleting a document > does not neccesarily reclaim the disk space. Optimize will reclaim that > disk space. > > For deleting ALL documents in your index there's actually a shortcut though. > Delete the entire solr 'data' directory and restart Solr, Solr will recreate > the data directory with starter index files. (Note you have to delete the > directory itself, if you just delete all the files inside it, Solr will get > unhappy). I am somewhat suspicious of doing this and would never do it on a > production index, but for just development playing around where it's not that > disastrous if something goes wrong, it's a lot lot quicker than an actual > delete command followed by an optimize. > ________________________________________ > From: kenf_nc [ken.fos...@realestate.com] > Sent: Thursday, September 23, 2010 8:22 AM > To: solr-user@lucene.apache.org > Subject: Re: How can I delete the entire contents of the index? > > Quick tangent... I went to the link you provided, and the delete part makes > sense. But the next tip, how to re-index after a schema change. What is the > point of step > > 5. Send an <optimize/> command. > > ? Why do you need to optimize an empty index? Or is my understanding of > Optimize incorrect? > -- > View this message in context: > http://lucene.472066.n3.nabble.com/How-can-I-delete-the-entire-contents-of-the-index-tp1565548p1567640.html > Sent from the Solr - User mailing list archive at Nabble.com. >
