Monitoring Splunk

performance characteristics of dedup command

Justin_Grant
Contributor

I'm thinking about using the DEDUP commend to solve the following problem: I have an event with an ID field and I'd like to show only the latest event matching each unique ID value. In most cases all the events with the same ID will be near each other (in time) but they won't be adjacent.

First, is DEDUP the right command to use in this scenario?

Second, how can I ensure that DEDUP (or whatever command is best for this) performs optimally? I have control over all aspects of the data (what fields are emitted, index-time vs. search-time fields, etc.) other than how many events are generated and I have limited control over the size of each event.

1 Solution

V_at_Splunk
Splunk Employee
Splunk Employee

Yes, DEDUP is right. Be sure to use its SORTBY clause, otherwise it won't do what you want! (And tell SORTBY whether the ID is str, num, or ip.)

To improve performance, try extracting the ID field, and giving its value to sourcetype or host attribute. Then, index as few other fields as possible.

Finally, if you can limit scope of the query time-wise, with earliest or such, please do that to help performance.

View solution in original post

V_at_Splunk
Splunk Employee
Splunk Employee

Yes, DEDUP is right. Be sure to use its SORTBY clause, otherwise it won't do what you want! (And tell SORTBY whether the ID is str, num, or ip.)

To improve performance, try extracting the ID field, and giving its value to sourcetype or host attribute. Then, index as few other fields as possible.

Finally, if you can limit scope of the query time-wise, with earliest or such, please do that to help performance.

Get Updates on the Splunk Community!

Splunk Observability Cloud | Unified Identity - Now Available for Existing Splunk ...

Raise your hand if you’ve already forgotten your username or password when logging into an account. (We can’t ...

Index This | How many sides does a circle have?

February 2024 Edition Hayyy Splunk Education Enthusiasts and the Eternally Curious!  We’re back with another ...

Registration for Splunk University is Now Open!

Are you ready for an adventure in learning?   Brace yourselves because Splunk University is back, and it's ...