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A row LCR represents a change made to a row of the table by a DML operation, and for this reason the row LCR is sometimes called a DML LCR. Typically each row LCR represents a change to an individual row in the table. One DML operation can affect several rows in the table, in which case an LCR is created for each of those affected rows.
If the row contains a column with a data type of LONG, LONG RAW, LOB, CLOB, or XML type stored as CLOB, then a change made to such a column may generate more than one LCR, depending on the size of the data.