In SAP Note 1999997 you can find more information for the top allocators. The translation tables are not automatically purged, but you could set the translator_cache_size parameter to a lower value to reduce the size of this pool. If the high memory consumption is not justified by the SQL statement complexity and data volume, you can additionally check SAP Note 2000002 and make sure that you haven't manually set a high value for the late materialization thresholds.
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