There are four types of schemas are available in data warehouse. Out of which the star schema is mostly used in the data warehouse designs. The second mostly used data warehouse schema is snow flake schema.We will see about these schemas in detail.tar Schema: A star schema is the one in which a central fact table is sourrounded by denormalized dimensional tables. A star schema can be simple or complex. A simple star schema consists of one fact table where as a complex star schema have more than one fact table.
Sandstorms -- also called duststorms -- are caused by strong winds blowing over loose soil or sand, and picking up so much of that material that visibility is greatly reduced. The widespread abundance of loose sand in deserts makes them the most common locations for sandstorms to form.In desert regions at certain times of the year, sandstorms become more frequent because the strong heating of the air over the desert causes the lower atmosphere to become unstable.This instability mixes strong winds in the middle troposphere downward to the surface, producing stronger winds at the surface.he widespread abundance of loose sand in deserts makes them the most common locations for sandstorms to form. In desert regions at certain times of the year, sandstorms become more frequent because the strong heating of the air over the desert causes the lower atmosphere to become unstable.
Intense rainfall can also cause the overflow of lakes and rivers. If a large mass of snow melts all at onc â¦ e it can also cause a flood. Floods usually result from excessive rainfall or from rough waves along coastal lowlands, and is either clogged or baked up. Floods are also caused by erosion.