Each channel can be set to a different persistence level. The default persistence level is level 1. Below is a list of persistence levels. Messages are kept in the database for every level except for level 0.
Level 0 is reserved for channels where recovery is not needed and speed is key. This is the only persistence level where messages can be lost if qie crashes. In all other levels it is written to the database to make sure you can recover the message.
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Persistence Level
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Description
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Level 0
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Messages are NOT persisted to the database. Use this option only if processing speed is critical and message recovery is not needed (e.g. processing large batch files which can easily be reprocessed if the channel stops unexpectedly or encounters critical errors).
Speed: Very Fast
Persistence: None
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Level 1
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Messages are persisted as they enter the inbound queue and as they are completed. Any messages that are in the processing or outbound queues when the channel is stopped will be restored back to the inbound queue when the channel is restarted.
Speed: Fast
Persistence: Inbound, Completed
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Level 2
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Messages are persisted as they enter the inbound queue, the outbound queue and as they are completed. Any messages that are in the processing queue when the channel is stopped will be restored back to the inbound queue when the channel is restarted.
Speed: Medium
Persistence: Inbound, Outbound, Completed
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Level 3
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Messages are persisted at every step, including each transition from one channel node to the next.
Speed: Reduced
Persistence: Inbound, Processing, Outbound, Completed
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