"Ben" wrote:

> Hello,
>
> Im a member of a team planning a data warehousing project. We have multiple data sources which are aggregated in a staging area. This is then denormalised and imported into the datawarehouse database.
>
> I am looking at ideas for incremental data refresh, rather than a drop and re-import of all data. This would allow us to have historic data.
>
> Does anyone have any tips that might be helpful for detecting changes in the source data for import? We have had some bad experiences with triggers on our source database in the past, so would rather not use these. I have considered replication and log shipping, but these just give a replica of the source data and does not flag the updated/new data.
>
> Any help would be greatly appreciated.
>
> Thanks.
>