All M queries of an import mode dataset are executed only once per scheduled refresh. Therefore, if sufficient resources are available during these scheduled intervals, the M queries can contain more complex and resource-intensive operations without negatively impacting report query performance. In fact, well-designed data retrieval processes can benefit from report query performance as the source data is prepped to take greater advantage of the compression algorithms applied to import mode datasets. The systems impacted by these retrieval operations depend on the data source, whether the data sources is located on-premises or in a public cloud, such as MS Azure, and the operations of the query itself.
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