With indexed fields Splunk works more or less similarily to a "classic" database search which is waaaaaay faster (especially with some types of searches) but at the cost of the field being immutable after the initial ingest-time extraction. If you search for a condition "field=value" Splunk doesn't - as many other solutions - scan an index of the "field" field for an occurrence of the string "value" but (simplifying a bit) rather scans for all occurrences of the string "value" and then checks in which events from the resulting set this value is in a proper spot within the event so that it matches the field "field". Syntax: TERM () Description: Match whatever is inside the parentheses as a single term in the index, even if it contains characters that are usually recognized as minor breakers, such as periods or underscores.Second thing is that due to that fact, Splunk works differently that, for example, Elastic (although in latest versions it is supposed to have some "schema on the fly" functionality but I haven't seen it in action yet). That's the first important thing about Splunk. In general - unless explicitly defined as index-time fields - no fields are extracted during ingestion. Hope you have understood the usage of first(), last(), earliest() and latest() with stats command clearly.It's a long story. If you will check the image 1, you can see the most recent timestamp value in â_timeâ field is â 12:00:07â and using â| stats latest(_raw)â function we are getting the value of â_rawâ field associated with that time which is âWed 12:00:07 Sneha is 18 years oldâ. Now, we have used â| stats latest(_raw)â, which is the giving the event (the value of â_rawâ field)which has the most recent timestamp( chronologically latest). Timestamp ( chronologically latest event).Ä®xample: 4 index=info | table _time,_raw | stats latest(_raw) This function is used to retrieve the event which has most recent If you will check the image 1, you can see the oldest timestamp value in â_timeâ field is â 11:34:23â and using â | stats earliest(_raw)â function we are getting the value of â_raw â field associated with that time which is â Wed Ap11:34:23 Saheb is 15 years old.â. Now, we have used â| stats earliest(_raw)â, which is the giving the event(the value of â_rawâ field) which has the oldest timestamp ( chronologically earliest). NOTE: Chronological order defines ordering events in accordance withÄ®xample:3 index=info | table _time,_raw | stats earliest(_raw) If youâre used to SQL, you can think of it like replacing SELECT with tstats and swapping the order of your WHERE and GROUP BY clauses. Writing Tstats Searches The syntax for tstats takes some practice to get right. This function is used to retrieve the event with the oldest timestamp The tstats command is most commonly employed for accelerated data models and calculating metrics for your event data. From the result set according to the order of events which is â Wed Ap11:34:23 Saheb is 15 years old.â ( Irrespective of the timestamp). If you will compare this with image 1 you will understand this value of â_rawâ with the timestamp â 11:34:23â is the last event or the value in the â_rawâ field. Or, in the other words you can say itâs giving the last value in the â _rawâ field. We have used â | stats last(_raw)â, which is giving the last event or the bottom event from the event list. This function is used to retrieve the last seen value of a specified field.Ä®xample:2 index=info | table _time,_raw | stats last(_raw) From the result set according to the order of events which is â Wed 12:00:07 Sneha is 18 years oldâ ( irrespective of the timestamp). If you will compare this with image 1 you will understand this value of â_rawâ with the timestamp â 12:00:07â is the first event or value of â_rawâ field. Or, in the other words you can say itâs giving the first seen value in the â_rawâ field. This means thatr you cannot use tstats for this search or add owp to the indexed fields. For example, the following search returns a table with two columns (and 10 rows). We have used â | stats first(_raw)â, which is giving the first event from the event list. you can use tstats only on indexed fields, in your case owp shouldn't be an indexed field. This function is used to retrieve the first seen value of a specified field.Ä®xample:1 index=info |table _time,_raw | stats first(_raw) However, you may prefer that collect break multivalue fields into separate field-value pairs when it adds them to a raw field in a summary index. Now, we will show you the usage of these functions on this event set. Please, see the below image to see how the result of this query looks like. To show the usage of these functions we will use the event set from the below query. Those are, first(), last() ,earliest(), latest(). Today we have come with a new interesting topic, some useful functions which we can use with stats command.
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