Expired scenario segment instances are purged in batches whose size is specified by the purgingBatchSize property of the ScenarioManager component. In a purging job, multiple batches of this size are purged until there are no remaining expired instances of each segment. Each batch is wrapped in a separate transaction to ensure that only the updates in a particular batch are rolled back if any problems occur.

By default, the value of purgingBatchSize is set to 200. Increasing the purgingBatchSize value has the advantage of allowing scheduled purging to be performed in fewer transactions. However, a lower values decreases the number of records that need to be rolled back if there is a problem with a transaction.