Restructuring view maintenance system and method
First Claim
1. A system for incremental maintenance of replicated information between a base table and a target table that are restructured representations of each other, the system comprising:
- a monitoring module configured to receive notification of modifications to the base table;
a consultation module configured to consult the base table about the nature of the modifications to the base table in response to receipt of notification by the monitoring module; and
a conversion module configured to receive the nature of the modifications from the consultation module and propagate the modifications into the target table, including propagating changes to the metadata of the base table into the target table.
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Accused Products
Abstract
A database maintenance system and method are particularly suitable for maintaining a consistency of data between two or more database tables having schemas that may be heterogeneous (e.g., restructuring views of each other). Typically, one table is a base table and a second table is a restructuring view of the base table and may have been generated for faster query response, research, or the like. The restructuring view may have occurred naturally, or the base table may have been converted to the restructuring view using a series to of operators and optionally, a middleware schema. The restructuring view maintenance system is preferably configured to monitor changes to the base table, including changes to data and to metadata. The maintenance system is configured to receive notification of a modification to a base table, investigate the modifications, and determine which operator(s) have been used to convert the base table to the restructuring view. For each modification to the base table, the system then determines, according to the type of modification and the type of transformation used, which of a selected group of actions to take to map the modification onto the restructuring view. The selected group of actions may include variously: insert, update, delete, rename relation, drop table, and rename column, according to the type of modification and the mapping of the relationship between the base table and the target table.
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Citations
30 Claims
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1. A system for incremental maintenance of replicated information between a base table and a target table that are restructured representations of each other, the system comprising:
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a monitoring module configured to receive notification of modifications to the base table;
a consultation module configured to consult the base table about the nature of the modifications to the base table in response to receipt of notification by the monitoring module; and
a conversion module configured to receive the nature of the modifications from the consultation module and propagate the modifications into the target table, including propagating changes to the metadata of the base table into the target table. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for incremental maintenance of replicated information between a base table and a target table that are restructured representations of each other, the method comprising:
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receiving notification of modifications to the base table, including modifications to metadata of the base table;
consulting the base table about the nature of the modifications to the base table in response to receipt of notification by the monitoring module;
receiving the nature of the modifications; and
propagating the modifications into the target table, including propagating changes to the metadata of the base table into the target table. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An article of manufacture comprising a program storage medium readable by a processor and embodying one or more instructions executable by the processor to perform a method for incremental maintenance of replicated information between a base table and a target table that are restructured representations of each other, the method comprising:
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receiving notification of modifications to the base table, including modifications to metadata of the base table;
consulting the base table about the nature of the modifications to the base table in response to receipt of notification by the monitoring module;
receiving the nature of the modifications; and
propagating the modifications into the target table, including propagating changes to the metadata of the base table into the target table. - View Dependent Claims (22, 23, 24, 25, 26, 27, 29, 30)
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28. The article of manufacture of claim 123, wherein propagating the modifications into the target table further comprises, when the base table is mapped to the target table using a split operator, to select a propagation operation to propagate the modifications to the target table according to the nature of the modifications to the base table, the propagation operation selected from the group consisting of an insert operation, an update operation, a delete operation;
- and a column renaming operation.
Specification