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tal vez acabo de dar con la respuesta, a ver si funciona, de la ayuda de delphi:
TDataset
property BufferCount: Integer;
Description
TDataSet maintains an internal cache of records from the underlying database table. For example, if the dataset is used to populate a data-aware grid, the cache includes a record for each row in the grid. BufferCount indicates the size of this cache. An associated TDataLink object determines the value of BufferCount.
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