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a file in which records are ordered according to the values of one or more key fields.
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a sequential file in which records are physically adjacent, in sequential order.
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Slowly Changing Dimensions |
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The approaches involving maintaining a list or history by adding related rows or new columns, or simply ignoring the problem by retaining the only the current data.Type I, Type II, Type III
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A snowflake schema is a set of tables comprised of a single, central fact table surrounded by normalised dimension hierarchies. Each dimension level is represented in a table. Snowflake schema implement dimensional data structures with fully normalised dimensions. Star schema are an alternative to snowflake schema.
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A star schema is a set of tables comprised of a single, central fact table surrounded by de-normalised dimensions. Each dimension is represented in a single table. Star schema implement dimensional data structures with de-normalised dimensions. Snowflake schema are an alternative to star schema.
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It has system-generated artificial primary key values, which allows to maintain historical records in the Data Warehouse more effectively.
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a relation that consists of a set of columns with a heading and a set of rows.
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data whose accuracy is relevant to some one moment in time.
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Involves in building a datawarehouse first and then building datamarts.
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the activity of executing many short, fast running programs, providing the end user with consistent two or three second response time.
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data possessing both primitive and derived characteristics; usually very sensitive to the running of the business.
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Glossary 
