3/1/2024 0 Comments Left join splunk inputlookupStep 2: Use the join command to add in the IP addresses from the blacklist, including every IP address that matches between the two changes from a 0 to a 1. Step 1: Start by creating a temporary value that applies a zero to every ip address in the data. In this search, we are looking for ip addresses that are not found on our ip blacklist. Index=test | dedup ip | eval temp_value=0 | table ip temp_value | join type=left ip | table ip temp_value | where temp_value=0 Let’s look at a sample search that draws a simple picture of what you can do to join. How to Use the Join Command in Splunk (+Example) An inner join produces only results where the main search and subsearch match.A left join produces ALL of the results from the main search joined with matching results from the subsearch.There are two types of joins: left and inner. Now that we know what to prepare with join, let’s take a look at the syntax: |join type= left|inner Types of Join Commands Read on to learn how to use the join command responsibly. While on the surface it seems like a solution that could be applied to everything, it can consume too much time and Splunk resources if it’s used irresponsibly. WARNING: T he join command should not be used lightly. Or you’re trying to compare values from a lookup because you need to find values that match or don’t match. Let’s say you’re trying to match an IP address information from one index to another index with CIDR’s. To minimize the resource consumption within Splunk, the join command is primarily used when the results of the subsearch are relatively small - 50,000 rows or fewer. To use the join command, the field name must be the same in both searches and it must correlate to two data sets. The join command brings together two matching fields from two different indexes. The answer is yes! In these cases, we can use the join command to achieve the results we’re looking for. When searching across your data, you may find it necessary to pull fields and values from two different data sources.
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