Which are the following are true about a data warehouse database? Because the data is mainly read only, transactions and isolation are not usually a concern in a warehouse database. The design of the warehouse tables should be optimized for query that is there are usually many indexes per table and tables may be unnormalized to reduce the number of joins. Indexes should be kept to a minimum to reduce the time to load the data. The schema design of the warehouse tables should be similar to the schema of the operational database for ease of extract and loading.. The size of the warehouse database can be kept to a minimum by storing historical data in the operational system.

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