- Mark as New
- Bookmark Message
- Subscribe to Message
- Mute Message
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
What is Splunk database engine?
- Mark as New
- Bookmark Message
- Subscribe to Message
- Mute Message
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content


Splunk uses a proprietary data store called an index which consists of raw files. It is nothing like a conventional DB. Here is a good explanation of what an index is and how Splunk stores data:
http://docs.splunk.com/Documentation/Splunk/6.6.0/Indexer/Howindexingworks
Here is a good explanation of how data is stored in the index:
http://docs.splunk.com/Documentation/Splunk/6.6.0/Indexer/HowSplunkstoresindexes
MongoDB is used by Splunk to facilitate certain internal functionality like the kvstore but is by no means where data is stored as it is ingested from Universal Forwarders etc. Data that is ingested from external sources all goes to an index as specified in your configuration.
- Mark as New
- Bookmark Message
- Subscribe to Message
- Mute Message
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
@tnesavich_splun - just FYI - the links no longer work
- Mark as New
- Bookmark Message
- Subscribe to Message
- Mute Message
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content

- Mark as New
- Bookmark Message
- Subscribe to Message
- Mute Message
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Thank you, that worked. https://docs.splunk.com/Documentation/Splunk/9.0.1/Indexer/HowSplunkstoresindexes
- Mark as New
- Bookmark Message
- Subscribe to Message
- Mute Message
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content

Splunk might be using mongDB database, not sure even i want confirmation.
Why mongoDB: Coz i have seen the process named mongoDB running when indexer starts or restart.
Also source = C:\Program Files\Splunk\var\log\splunk\mongod.log with index=_internal*
- Mark as New
- Bookmark Message
- Subscribe to Message
- Mute Message
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content

I believe the mongoDB is part of the KV Store not indexing.
- Mark as New
- Bookmark Message
- Subscribe to Message
- Mute Message
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content


@stath002 is correct. It's for storing state or whatever you'd like but absolutely it's not the data storage system.
Learn more: About the app key value store
- Mark as New
- Bookmark Message
- Subscribe to Message
- Mute Message
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
I think Splunk might be using Lucene as a backend seach engine, though I am not sure, and looking for a confirmation.
- Mark as New
- Bookmark Message
- Subscribe to Message
- Mute Message
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
No. Splunk uses its own proprietary storage/db.
- Mark as New
- Bookmark Message
- Subscribe to Message
- Mute Message
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Yes, it might use its own proprietary storage, but what about the search engine? Lucene sounds like a good possibility.
- Mark as New
- Bookmark Message
- Subscribe to Message
- Mute Message
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
is it mean, Splunk develop its own system to do this from ZERO? And it is really does not have any kind direct/significant relation to other DB technology?
- Mark as New
- Bookmark Message
- Subscribe to Message
- Mute Message
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content


Yes, Splunk developed their own on-disk storage format from "zero". (If you call having a C++ compiler and standard libraries "zero") From an architecture perspective, there are large differences between an ACID-capable generalized RDBMS and (essentially) a search engine's data storage. Splunk does not have (and does not need) many of the features a relational DB has. Also, most relational DB's full-text search are ugly side-additions. The Splunk developers were able to make an on-disk data format that meets their needs exactly.
- Mark as New
- Bookmark Message
- Subscribe to Message
- Mute Message
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content

Hi there,
Splunk does not use arealtional database to store events and indexes.
The storage is all flat file based.
Please have a look here:
http://www.splunk.com/base/Documentation/4.1.4/Admin/WhatsaSplunkindex
Hope that answers your question?
Cheers,
simuvid
- Mark as New
- Bookmark Message
- Subscribe to Message
- Mute Message
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content


Adding updated link:
http://docs.splunk.com/Documentation/Splunk/6.5.1/Indexer/Howindexingworks
