Updating partition key column

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These enterprises are challenged by the support and maintenance requirements of very large databases (VLDB), and must devise methods to meet those challenges.One way to meet VLDB demands is to create and use for finer levels of manageability and improved performance. Each partition is stored in its own segment and can be managed individually.An index will be helpful in the latter case but not the former.

The following forms of partitioning can be implemented in defined by a key column or set of columns, with no overlap between the ranges of values assigned to different partitions.It is common to want to remove old partitions of data and periodically add new partitions for new data.One of the most important advantages of partitioning is precisely that it allows this otherwise painful task to be executed nearly instantaneously by manipulating the partition structure, rather than physically moving large amounts of data around.The company measures peak temperatures every day as well as ice cream sales in each region.Conceptually, we want a table like: We know that most queries will access just the last week's, month's or quarter's data, since the main use of this table will be to prepare online reports for management.In this situation we can use partitioning to help us meet all of our different requirements for the measurements table.

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