SQL Guide : Database system tables and system views : System tables for data synchronization : SYS_SYNC_MASTER_STORED_BLOB_REFS
  
SYS_SYNC_MASTER_STORED_BLOB_REFS
The BLOBs to be sent are stored in this table on the master. The implementation sees to it that the BLOB is physically saved on disk once only even if it is logically saved several times.
Column name
Description
REPLICA_ID
Internal ID of the replica database to which the message will be sent.
MSG_ID
Internal ID of the message.
BLOB_NUM
The number that identifies the BLOB.
DATA
A reference to the BLOB.
See also
System tables for data synchronization