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Implementing Splunk 7, Third Edition

You're reading from   Implementing Splunk 7, Third Edition Effective operational intelligence to transform machine-generated data into valuable business insight

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Product type Paperback
Published in Mar 2018
Publisher Packt
ISBN-13 9781788836289
Length 576 pages
Edition 3rd Edition
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Author (1):
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James D. Miller James D. Miller
Author Profile Icon James D. Miller
James D. Miller
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Table of Contents (15) Chapters Close

Preface 1. The Splunk Interface FREE CHAPTER 2. Understanding Search 3. Tables, Charts, and Fields 4. Data Models and Pivots 5. Simple XML Dashboards 6. Advanced Search Examples 7. Extending Search 8. Working with Apps 9. Building Advanced Dashboards 10. Summary Indexes and CSV Files 11. Configuring Splunk 12. Advanced Deployments 13. Extending Splunk 14. Machine Learning Toolkit

Using wildcards efficiently


Though the index is based on words, it is possible to use wildcards when necessary, albeit a little carefully. Take a look at some interesting facts about wildcards:

  • Only trailing wildcards are efficient: Stated simply, bob* will find events containing Bobby efficiently, but *by or *ob* will not. The latter cases will scan all events in the time frame specified.
  • Wildcards are tested last: Wildcards are tested after all other terms. Given the search authclass *ob* hello world, all other terms besides *ob* will be searched first. The more you can limit the results using full words and fields, the better your search will perform.

Supplementing wildcards in fields

Given the following events, a search for world would return both events:

2012-02-07T01:04:31.102-0600 INFO AuthClass Hello world. [user=Bobby, ip=1.2.3.3] 
2012-02-07T01:23:34.204-0600 INFO BarClass Goodbye. [user=Bobby, ip=1.2.3.3, message="Out of this world"] 

What if you only wanted the second event but all...

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