Splunk® Enterprise

Managing Indexers and Clusters of Indexers

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Splunk Enterprise version 6.x is no longer supported as of October 23, 2019. See the Splunk Software Support Policy for details. For information about upgrading to a supported version, see How to upgrade Splunk Enterprise.
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Optimize indexes

While the indexer is indexing data, one or more instances of the splunk-optimize process will run intermittently, merging index files together to optimize performance when searching the data. The splunk-optimize process can use a significant amount of cpu but only briefly. You can reduce the number of concurrent instances of splunk-optimize by changing the value of maxConcurrentOptimizes in indexes.conf, but this is not typically necessary.

If splunk-optimize does not run frequently enough, searching will be less efficient.

splunk-optimize runs only on hot buckets. You can run it on warm buckets manually, if you find one with a larger number of index (.tsidx) files; typically, more than 25. To run splunk-optimize, go to $SPLUNKHOME/bin and type:

 splunk-optimize -d|--directory <bucket_directory>

splunk-optimize accepts a number of optional parameters. To see a list of available parameters, type:


For more information on buckets, see How Splunk stores indexes.

Last modified on 13 February, 2017
Manage pipeline sets for index parallelization
Use the monitoring console to view indexing performance

This documentation applies to the following versions of Splunk® Enterprise: 6.3.0, 6.3.1, 6.3.2, 6.3.3, 6.3.4, 6.3.5, 6.3.6, 6.3.7, 6.3.8, 6.3.9, 6.3.10, 6.3.11, 6.3.12, 6.3.13, 6.3.14, 6.4.0, 6.4.1, 6.4.2, 6.4.3, 6.4.4, 6.4.5, 6.4.6, 6.4.7, 6.4.8, 6.4.9, 6.4.10, 6.4.11, 6.5.0, 6.5.1, 6.5.2, 6.5.3, 6.5.4, 6.5.5, 6.5.6, 6.5.7, 6.5.8, 6.5.9, 6.5.10

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