CHAPTER 7Logical Change Records

The Logical Change Record (LCR) is a specially formatted message that represents a database change. In previous chapters, LCRs were mentioned frequently when discussing how database changes are captured, propagated, and applied. The capture process and synchronous capture process create an LCR that represents the DDL or DML changes to the database. There are two types of LCRs:

Image Row LCR Represents the change made to a single row (sometimes called DML LCR)

Image DDL LCR Represents the change made by a DDL command

Both these ...

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