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?
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