Sometimes the file appears bigger than it should. The difference between the original and uploaded files is a multiple of the DM_FILE_BLOCKSIZE parameter on the server.
* Modify the symbol SQL_BSIZE to be 4000 bytes or more less than the DM_NETWORK_BLOCKSIZE. NOTE The DM_FILE_BLOCKSIZE and SQL_BSIZE symbol values must be the same. The DM_FILE_BLOCKSIZE value must not exceed the DM_NETWORK_BLOCKSIZE
Modify the symbol SQL_BSIZE to be 4000 bytes or more less than the DM_NETWORK_BLOCKSIZE. NOTE The DM_FILE_BLOCKSIZE and SQL_BSIZE symbol values must be the same. The DM_FILE_BLOCKSIZE value must not exceed the DM_NETWORK_BLOCKSIZE
Modify the symbol DM_NETWORK_BLOCKSIZE to be 1000 bytes (or more) but not exceed the value of BDP. Modify the symbol DM_FILE_BLOCKSIZE to be 4000 bytes (or more) but not exceed the value of DM_NETWORK_BLOCKSIZE. Web Client Performance Optimization
Modify the symbol SQL_BSIZE to be 4000 bytes or more less than the DM_NETWORK_BLOCKSIZE. NOTE The DM_FILE_BLOCKSIZE and SQL_BSIZE symbol values must be the same. The DM_FILE_BLOCKSIZE value must not exceed the DM_NETWORK_BLOCKSIZE