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The search query index=myindex source=c: \mydata. txt NOT error=* specifies three criteria for the events to be returned:

The index must be myindex, which is a user-defined index that contains the data from a specific source or sources.

The source must be c: \mydata. txt, which is the name of the file or directory where the data came from.

The error field must not exist in the events, which is indicated by the NOT operator and the wildcard character (*).

The NOT operator negates the following expression, which means that it returns the events that do not match the expression. The wildcard character () matches any value, including an empty value or a null value. Therefore, the expression NOT error= means that the events must not have an error field at all, regardless of its value.

The search query does not use quotation marks around the source value, which means that it is case-sensitive and exact. If there are any variations in the source name, such as capitalization or spacing, they will not match the query.

References

Search command syntax details

Search command examples

Basic searches and search results

The four types of lookups that Splunk provides out-of-the-box are file-based, external, KV Store, and geospatial. File-based lookups use CSV files to map fields from your data to fields in the external table. External lookups use Python scripts or binary executables to populate your events with field values from an external source. KV Store lookups use a key-value store to map fields from your data to fields in the external table. Geospatial lookups use KMZ or KML files to match location coordinates in your events to geographic feature collections1.