What is this Where clause by time doing?

[wrussell12]

Is this requesting all the records, from 3 minutes ago?

index="my_index" source="bandstats" recordType="core" 
    | dedup coreName 
    | where _time < (now() - 180) 

_time = 1565372570 (minus 3600)
now = 1565376170 (current time)
3mins ago = 1565375990
1565372570 < 1565375990

So, this search is looking for records that are older than 3 minutes ago?

This where clause seems to be making the entire search slow, what would be a better alternative?

[richgalloway · Accepted solution]

Yes, the where clause is looking for events that are at least 3 minutes old. This is unnecessary. Use index="my_index" source="bandstats" recordType="core" latest=-3m | dedup coreName.

You can confirm what is making the search slow with the Job Inspector.

[wrussell12]

How could I use this what a datamodel, and tstats?

Optimized:

 index="my_index" source="bandstats" recordType="core" latest=-3m
     | dedup coreName 

.

 | tstats latest(band.coreName) as coreName from bandstats.band by coreId, _time
 | where _time < (now() - 180) 

[richgalloway]

tstats does not support the latest option so you're stuck with where.