Q: Please provide some advice on the pros and cons of having a data mart in separate instance instead of with a data warehouse.
Let me first say that it depends on your architected environment. If you have an ETL tool vs. using SQL would change these pros and cons. Mine will be based on using an ETL tool with multiple instances. Pros: 1) You can put the data closer to the user community; 2) You can build the data mart into the appropriate data structure (relational vs. multidimensional); 3) You can tune the two database environments better than one since the workloads will be different.
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