Gravic, Inc.

Eugene P Jarema

Bruce D Holenstein

Paul J Holenstein

Dylan R Holenstein

Gary E Strickler

An automated method is provided for comparing a first database table and a second database table with each other to produce a table of differences therebetween. The first database table and the second database table include one or more subsets of data that are intended to match each other. The first database table and the second database table each include multiple rows, each row having multiple columns. A first set of indicia is generated comprising indicia for a subset of the columns of each of the multiple rows of a subset of the first database table, and a second set of indicia is generated comprising indicia for a subset of the columns of each of the multiple rows of a subset of the second database table. The second set of indicia are generated without regard to an original order of the columns in the second database. The indicia in the first set of indicia are compared with the indicia in the second set of indicia on a row-by-row basis, wherein the comparing occurs without regard to an original order of the rows in the second database table. Any indicia in the first set of indicia that are not present in the second set of indicia are identified, thereby identifying a first set of mismatched indicia. Likewise, any indicia in the second set of indicia that are not present in the first set of indicia are identified, thereby identifying a second set of mismatched indicia. The table of differences is populated with the identified indicia. The second database table may be repaired by using at least one of the first set of mismatched indicia and the second set of mismatched indicia.

Method for comparing rows of subsets of two database tables without regard to an original order of rows and columns in either database table

A method and system are provided for comparing a first database table and a second database table with each other to produce a table of differences therebetween. The first database table and the second database table include one or more subsets of data that are intended to match each other, and the first database table and the second database table each include multiple rows. Indicia is generated for each of the multiple rows of a subset of the first database table, and each of the multiple rows of a subset of the second database table. The generated indicia for each of the multiple rows of the subset of the first database table are compared with the generated indicia for the subset of each of the multiple rows of the subset of the second database table, on a row-by-row basis, wherein the comparing occurs without regard to an original order of the rows in either the first database table or the second database table. Any generated indicia for each of the multiple rows of the subset of the first database table that are not present in the generated indicia for each of the multiple rows of the subset of the second database table are identified as a first set of mismatched indicia. Any generated indicia for each of the multiple rows of the subset of the second database table that are not present in the generated indicia for each of the multiple rows of subset of the first database table are identified as a second set of mismatched indicia. The table of differences is populated with the generated indicia. The second database table may be repaired by using at least one of the first set of mismatched indicia and the second set of mismatched indicia.

Method and apparatus for comparing rows of subsets of two database tables without regard to an original order of rows in either database table

A method and system are provided for comparing a first database table and a second database table with each other to produce a table of differences therebetween. The first database table and the second database table include one or more subsets of data that are intended to match each other, and the first database table and the second database table each include multiple rows. Indicia is generated for each of the multiple rows of the first database table, and each of the multiple rows of the second database table. The generated indicia for each of the multiple rows of the first database table are compared with the generated indicia for each of the multiple rows of the second database table, wherein the comparing occurs without regard to an order of the rows in either the first database table or the second database table. Any generated indicia for each of the multiple rows of the first database table that are not present in the generated indicia for each of the multiple rows of the second database table are identified as a first set of mismatched indicia. Any generated indicia for each of the multiple rows of the second database table that are not present in the generated indicia for each of the multiple rows of the first database table are identified as a second set of mismatched indicia. The table of differences is populated with the generated indicia.

Method and apparatus for comparing two database tables without regard to an original order of rows in either database table

A method is provided for resolving collisions in a database replication system. The system includes a source database and a target database, wherein changes made at the source database are replicated to the target database. Each database has one or more tables, and at least one of the tables has multiple constraints. A collision is detected during data replication as a result of one of the tables having multiple constraints. One constraint that contributes to the collision is identified. The constraint that contributes to the collision is relaxed, or the cause of the constraint that contributes to the collision is removed. This process is repeated for all additional constraints that contribute to the collision. In this manner, the collision is resolved.

Method for resolving collisions in a database replication system by relaxing a constraint that contributes to collisions, or removing the cause of the constraint that contributes to the collisions

A data replication engine is controlled in a system that replicates data associated with a plurality of transactions from a source database to a target database. The system includes a change queue that contains transaction data associated with the transactions. The system maintains one or more attributes outside of the change queue which are associated with transactions. One or more attributes outside of the change queue are identified which are associated with a transaction. The one or more of the identified attributes are then used to control the replication engine.

Control of a data replication engine using attributes associated with a transaction

Collisions are resolved in a database replication system. The system includes a plurality of nodes arranged in either a master-slave or network configuration. Each node includes a database, wherein changes made at the databases of each node are replicated to the databases at one or more of the other nodes. When a collision is detected during data replication between multiple nodes, the collision is resolved by a rule that gives precedence to certain nodes over other nodes.

Growing community of inventors

Downington, PA, United States of America

Eugene P Jarema