In Kusto, you must start each query with find, an unquoted string is a column name, and the lookup value must be a quoted string. In Splunk, you can omit the search keyword and specify an unquoted string. In the following examples, the Splunk field rule maps to a table in Kusto, and Splunk's default timestamp maps to the Logs Analytics ingestion_time() column. The following sections give examples of how to use different operators in Splunk and Kusto. In Kusto, it can be used with the where operator. (2) In Splunk, the function is invoked by using the eval operator. In Kusto, it's used as part of extend or project. (1) In Splunk, the function is invoked by using the eval operator. | extend myTime = now() - totimespan("1d"). For example, search | eval n=relative_time(now(), becomes. (1) In Kusto, Splunk's equivalent of relative_time(datetimeVal, offsetVal) is datetimeVal + totimespan(offsetVal). Kusto's returns a number between 0.0 and 1.0, or if a parameter is provided, between 0 and n-1. Splunk's function returns a number between zero to 2 31-1. In Splunk, searchmatch allows searching for the exact string. (1) Also note that Splunk uses one-based indices. (1) Although replace functions take three parameters in both products, the parameters are different. Replace_string(), replace_strings() or replace_regex() The following table specifies functions in Kusto that are equivalent to Splunk functions. In Kusto, you can define a policy called ingestion_time that exposes a system column that can be referenced through the ingestion_time() function. In Splunk, each event gets a system timestamp of the time the event was indexed. Both have the ability to work dynamically with data types and roughly equivalent set of datatypes, including JSON support.Ĭoncepts essentially are the same between Kusto and Splunk. Kusto data types are more explicit because they're set on the columns. In Splunk, each event has its own set of fields. In Kusto, this setting is predefined as part of the table structure. Kusto logs have the concept of a table, which has columns. Splunk doesn't expose the concept of event metadata to the search language. Both implementations allow unions and joining across these partitions. This setting directly affects the performance of queries and the cost of the deployment.Īllows logical separation of the data. Splunk doesn't.Ĭontrols the period and caching level for the data. Kusto allows arbitrary cross-cluster queries. The following table compares concepts and data structures between Splunk and Kusto logs: Concept Direct comparisons are made between the two to highlight key differences and similarities, so you can build on your existing knowledge. The keepevents= argument is not supported in SPL2.This article is intended to assist users who are familiar with Splunk learn the Kusto Query Language to write log queries with Kusto. Use the sort command before the dedup command if you want to change the order of the events, which dictates which event is kept when the dedup command is run.Īlternative: If you are using the from command, you can specify the ORDER BY clause instead of using the sort command. The sortby argument is not supported in SPL2. In SPL2, the list of fields must be comma-delimited. In SPL2, command options must be specified before the. This performance behavior also applies to any field with high cardinality and large size.ĭifferences between SPL and SPL2 Command options must be specified first If you search the _raw field, the text of every event in memory is retained which impacts your search performance. Avoid using the dedup command on the _raw field if you are searching over a large volume of data.
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