Monitor active and completed truncations, and active rules using the Truncations and Truncation History subtabs.
Truncation rules govern when derived
and market data is deleted. Rules specify which of the oldest data to delete. There are two supported truncation rule types: scheduled and cache-full based rules.
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Scheduled (time-interval-based) rules truncate data according to set time intervals. For example, you may create a rule to: Every 10 minutes, on minute 5, truncate any data in table X that is older than 3 hours.
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Cache-full (memory-threshold-based) rules truncate data when a memory threshold is reached. For example, you may create a rule to: When the cache is 80% full, truncate any data in table X that is older than 3 hours.