Utilizing rules in a distributed information sharing system
First Claim
1. A method for controlling a capture process running on a source database server, the method comprising the steps of:
- said capture process propagating messages between said source database server and a destination database server;
said capture process scanning one or more records from a redo log that records changes made at said source database server;
said capture process generating a particular message that includes data from said one or more records;
said capture process calling a rules engine to make an evaluation of a set of rules based on said data from said one or more records, wherein each rule of said set of rules is associated with a condition and first data that identifies an action;
for a particular rule of said set of rules whose corresponding condition is satisfied based on said evaluation, said rules engine returning said first data for said particular rule; and
said capture process performing the action identified by the first data returned by said rules engine.
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Abstract
Described herein are various approaches that allow rules to be used to specify actions, that alleviate the complexity and burden of developing and maintaining rules in a rules-based messaging system, and that provide more efficient ways of evaluating rules. The approaches allow rules to specify user-defined transformation functions for transforming messages, to specify when and how to perform row migration, and to specify other types of actions. Rules are grouped into rule sets. Several types of rule sets, referred to as positive and negative rule sets, allow users to use rules that are less complex to develop and maintain. Rule sets are evaluated more efficiently by attempting to evaluate the rule set with less information than is needed to evaluate all the rules in the rule set. Also, the results of rules evaluations that are based on a set of values are cached for later retrieval.
125 Citations
20 Claims
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1. A method for controlling a capture process running on a source database server, the method comprising the steps of:
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said capture process propagating messages between said source database server and a destination database server; said capture process scanning one or more records from a redo log that records changes made at said source database server; said capture process generating a particular message that includes data from said one or more records; said capture process calling a rules engine to make an evaluation of a set of rules based on said data from said one or more records, wherein each rule of said set of rules is associated with a condition and first data that identifies an action; for a particular rule of said set of rules whose corresponding condition is satisfied based on said evaluation, said rules engine returning said first data for said particular rule; and said capture process performing the action identified by the first data returned by said rules engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification