GETUPDATEBEFORES | INGNORUPDATEBEFORES
TABLE
...
GETUPDATECOLS(column_specification),
For tables with large number columns(i.e > 40 or even 300 columns), you should avoid using GETUPDATEBEFORES because it will include the before images of all the columns. Instead, use GETUPDATECLOS to allow you specify a subset of columns and get their before images only. This will reduce trail file size and thus improve the replication performance.