_SLPE_DEBUG               : INTERNAL: compare lobpage dbas from inode and from scan
ALLOW_CHECKSUM_MISMATCH   : DISCOURAGED: allow block checksum mismatch
ALLOW_DBA_MISMATCH        : DISCOURAGED: allow wrong dba in block
ALLOW_OTHER_OBJNO         : allow other objno in segment header(for out of sync data dictionaries)
ALLOW_TRAILER_MISMATCH    : DISCOURAGED: allow block trailer/incseq mismatch
ASM_DO_HARD_CHECKS        : Use H.A.R.D. checks to verify mirrors
AUTO_UPDATE_CHECKSUM      : When patching automatically update the checksum
AUTO_UPDATE_TRAILER       : When patching automatically update the trailer
BUFFER                    : row output buffer size
CF_FILES                  : Size of control file entry table
CF_TABLESPACES            : Size of Tablespace Controlfile Cache
COMPATIBLE                : database version (6|7|8|8.1|9|10)
CONTROL_FILE              : DUL control file name
DB_BLOCK_SIZE             : Oracle Data Block Size
DB_NAME                   : database name in file header
DB_ID                     : Database ID in file header
DC_COLUMNS                : Size of Column Dictionary Cache
DC_OBJECTS                : Size of Object Dictionary Cache
DC_TABLES                 : Size of Table Dictionary Cache
DC_USERS                  : Size of Users Dictionary Cache
DC_SEGMENTS               : Size of the Scanned Segment Dictionary Cache
DC_EXTENTS                : Size of Scanned Extent Dictionary Cache
DEFAULT_CHARACTER_SET     : Default character set Name or numeric id
DEFAULT_NATIONAL_CHARACTER_SET : Default National Character set Name or numeric id
EXPORT_MODE               : EXPort output MODE or SQL*Loader like output
FEEDBACK                  : display progress every x rows/blocks (0)
FILE                      : Output (dump or data) file name
FILE_SIZE_IN_MB           : max output file size, enables splitting output files
LDR_ENCLOSE_CHAR          : Character to enclose strings
LDR_OUTPUT_IN_UTF8        : Convert (N)Character strings to UTF8 (beta)
LDR_PHYS_REC_SIZE         : SQL*Loader physical record size
LOGFILE                   : DUL logfile
MAX_OPEN_FILES            : Maximum # files that are concurrently kept open
OSD_MAX_THREADS           : Port specific maximum number of threads
OSD_BIG_ENDIAN_FLAG       : Byte order in machine word
OSD_DBA_FILE_BITS         : File Number Size in DBA
OSD_FILE_LEADER_SIZE      : bytes/blocks before file header block
OSD_C_STRUCT_ALIGNMENT    : C Structure member alignment (0, 16, 32 or 64)
OSD_WORD_SIZE             : Size of a machine word always 32, except for MS/DOS(16)
PARSE_HEX_ESCAPES         : Use \xhh hex escape sequences in strings while parsing
RESET_LOGFILE             : truncate the logfile on each invocation
SCAN_DATABASE_SCANS_LOB_SEGMENTS : builds (possibly huge) SCANNEDLOBPAGE.dat  to locate missing lob pages and for unload lob segment
SCAN_STEP_SIZE            : Step/Alignment size while scanning raw device
TRACE_FLAGS               : DUL Internal Tracing Options
UNEXP_MAX_ERRORS          : max errors in a single table/partition during unexp
UNEXP_VERBOSE             : a little bit more output during scan, but much slower
USE_LOB_FILES             : to get old behaviour with each lob in its own lobfile
USE_SCANNED_EXTENT_MAP    : Use the scanned extent map in case of corrupted or missing segment headers
VERIFY_NUMBER_PRECISION   : Check precision and scale of numbers during conversion
WARN_RECREATE_FILES       : Issue a warning message if a data/export/control file will be recreated
WRITABLE_DATAFILES        : Allow DUL to update a data file, only required for FORMAT, UPDATE and SCAN DEVICE