Optimize is an expensive operation. It will cost you 2x disk space, plus
CPU and RAM. It is usually advisable not to optimize unless you really need
to, and do not optimize frequently. Whether this can impact the server and
search depends on the index size and hardware specification.

See more here:

https://lucidworks.com/2017/10/13/segment-merging-deleted-documents-optimize-may-bad/

https://lucidworks.com/2018/06/20/solr-and-optimizing-your-index-take-ii/

https://youtu.be/poARdta7Z_s

Best regards,
Edward

Em qua, 26 de dez de 2018 01:14, Talha Muhammed <talhanat...@gmail.com
escreveu:

>  I recently installed Solr 6.4 and configured it to work with Full import
> of index using DataImportHandler as the data's were stored at SQL server.
>
> Now I want to do delta import for the new/updated records to be index to
> solr. But unfortunately this functionality is not working through my Solr
> Admin,  But the new/updated data's are getting indexed automatically.
>
> When I verified the logs,  I could see that the below warning messages are
> occurring recursively.
>
> "2018-12-19 16:13:21.927 WARN  (qtp736709391-15) [   x:solrprod]
> o.a.s.u.DirectUpdateHandler2 Starting optimize... Reading and rewriting the
> entire index! Use with care."
>
> Kindly help and suggest whether rewriting the entire index is an issue or
> not and let me know whether it can impact my server or search.
>
> Thanks,
> Talha
>

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