Module 5: Correlating Events Flashcards
What is a Transaction?
A group of events related by having common values for one or more fields
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Where can events come from?
Events can come from multiple sources, sourcetypes, or hosts, and can span several timestamps
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Where can events related to a single purchase from an online store?
It can span across an application server, database, and e-commerce engine
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True or False: Can one email message create multiple events as it travels through various queues?
True
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What does a network traffic log represent?
A single user generating a single http request
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Visiting a single website normally generates what kind of http requests?
HTML, JavaScript, CSS files
Flash, images, etc
What are some of the transaction command’s characteristics?
- field-list can be one field name or a list of field names
- events are grouped into transactions based on the values of these fields
- if multiple fields are specified and a relationship exists between those fields, events with related field values are grouped into a single transaction
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What are the common constraints for the transaction command?
maxspan
maxpause
startswith
endswith
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When would you use the transaction command?
When you want to create a single event from a group of events
“the events must share the same value in specified field”
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Transactions can cross multiple tiers such as ___ or ___
Web servers or Application servers
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What command could you use at any point in the search pipeline to filter results?
The search command
“behaves exactly like search strings before the first pipe”
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What does the highlight command do?
It highlights the terms you specify
example: highlight JSESSIONID
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The transaction command produces additional fields, such as?
- duration - the difference between the timestamps for the first and last event in the transaction
- eventcount - the number of events in the transaction
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When using the transaction command you can also?
You can also define a max overall time span and max gap between events
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How would you set the overall max time span using the transaction command?
- maxspan=10m
- maximum total time between the earliest and latest events
- if not specified, default is -1 (or no limit)
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