sistats
Description
The sistats
command is one of several commands that you can use to create summary indexes. Summary indexing is one of the methods that you can use to speed up searches that take a long time to run.
The sistats
command is the summary indexing version of the stats
command, which calculates aggregate statistics over the dataset.
The sistats
command populates a summary index. You must then create a report to generate the summary statistics. See the Usage section.
Syntax
Required syntax is in bold.
- sistats
- [allnum=<bool>]
- [delim=<string>]
- ( <stats-agg-term>... | <sparkline-agg-term>... )
- [<by-clause>]
For descriptions of each of the arguments in this syntax, refer to the stats command.
Usage
The summary indexes exist separately from your main indexes.
After you create the summary index, create a report by running a search against the summary index. You use the exact same search string that you used to populate the summary index, substituting the stats
command for the sistats
command, to create your reports.
For more information, see About report acceleration and summary indexing and Use summary indexing for increased reporting efficiency in the Knowledge Manager Manual.
Supported functions
You can use a wide range of functions with the sistats
command. For general information about using functions, see Statistical and charting functions.
- For a list of statistical functions by category, see Function list by category
- For an alphabetical list of statistical functions, see Alphabetical list of functions
Statistical functions that are not applied to specific fields
With the exception of the count
function, when you pair the sistats
command with functions that are not applied to specific fields or eval
expressions that resolve into fields, the search head processes it as if it were applied to a wildcard for all fields. In other words, when you have | sistats avg
in a search, it returns results for | sistats avg(*)
.
This "implicit wildcard" syntax is officially deprecated, however. Make the wildcard explicit. Write | sistats <function>(*)
when you want a function to apply to all possible fields.
Memory and sistats search performance
A pair of limits.conf
settings strike a balance between the performance of sistats
searches and the amount of memory they use during the search process, in RAM and on disk. If your sistats
searches are consistently slow to complete you can adjust these settings to improve their performance, but at the cost of increased search-time memory usage, which can lead to search failures.
If you have Splunk Cloud you will need to file a Support ticket to change these settings.
For more information, see Memory and stats search performance in the Search Manual.
Examples
Example 1:
Create a summary index with the statistics about the average, for each hour, of any unique field that ends with the string "lay". For example, delay, xdelay, relay, etc.
... | sistats avg(*lay) BY date_hour
To create a report, run a search against the summary index using this search
index=summary | stats avg(*lay) BY date_hour
See also
- Related information
- For a detailed explanation and examples of summary indexing, see Use summary indexing for increased reporting efficiency in the Knowledge Manager Manual.
sirare | sitimechart |
This documentation applies to the following versions of Splunk® Enterprise: 8.0.0, 8.0.1, 8.0.2, 8.0.3, 8.0.4, 8.0.5, 8.0.6, 8.0.7, 8.0.8, 8.0.9, 8.0.10, 8.1.0, 8.1.1, 8.1.2, 8.1.3, 8.1.4, 8.1.5, 8.1.6, 8.1.7, 8.1.8, 8.1.9, 8.1.10, 8.1.11, 8.1.12, 8.1.13, 8.1.14
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