Introduction to ACD Replications
ACD (Add, Change, Delete) Replications are a special type of replication that track the operations done against a database rather than replicating the data itself. When an ACD Replication is defined, a source table is defined and a special ACD target table is created in the target database. The Event Producer will now monitor the source database for any transactions against the table specified in the ACD Replication and a record will be inserted into the ACD target table specifying each operation (Add, Change or Delete) that occurs for the transaction. The ACD target table is a transaction log for the specified source table.
ACD Target Table Metadata
The ACD target table consists of all the columns from the source table preceded by five pre-defined columns that provide transaction log information. The five columns are:

Column Name | Data Type | Description
CNX_ACD_TXID | VarChar(64) | Transaction ID from source database All operations within a transaction will have the same CNX_ACD_TXID
CNX_ACD_SequenceNumber | Integer | Sequence number within a transaction. Each operation within a transaction will have a sequence number denoting its position within a transaction. For example, if a transaction contains an insert, an update, and a delete, in that order, the sequence number of the insert will be 1, update will be 2 and the delete will be 3.
CNX_ACD_TimeCreated | TimeStamp | This is the timestamp from the source database denoting the time the operation occurred.
CNX_ACD_ChangeUser | WVarChar(256) | User ID that made the change in the source database
CNX_ACD_ChangeType | Char(1) | Type of change. Possible values are A,B,C or D

where