Oracle Distributed Systems

DBMS_RECTIFIER_DIFF: Comparing Replicated Tables

If you are not sure whether the data at two sites are identical, you can use the DBMS_RECTIFIER_DIFF package to find out.

How the Package Is Used

The DBMS_RECTIFIER_DIFF’s DIFFERENCES procedure compares two instantiations of a table. The table at one of two sites is considered the reference, or “truth” table, and the other is the “comparison” table. The procedure stores discrepancies between the truth table and comparison table in a “missing rows” table, which the user must create. If differences exist, the DBA can use the RECTIFY procedure to synchronize the comparison table with the truth table. The truth table is not modified.

Installation and Access

The DBMS_RECTIFIER_DIFF package iscreated when the Oracle database is installed. The dbmsrepc.sql script (found in the built-in packages source directory) contains the source code for this package’s specification. This script is called by catrep.sql, which must be run to install the advanced replication packages. The wrapped SQL script prvtrctf.sqlcreates the public synonym DBMS_RECTIFIER_DIFF. No EXECUTE privileges are granted on DBMS_RECTIFIER_DIFF; only the owner (SYS) and those with the EXECUTE ANY PROCEDURE system privilege may execute the package.

DBMS_RECTIFIER_DIFF Procedures

Procedure Name	Description
DIFFERENCES	Determines differences between the truth table and the comparison table
RECTIFY	Synchronizes the comparison table with the truth table

DBMS_RECTIFIER_DIFF Exceptions

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