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Differences between Data Pump impdp and import utility

Oracle Tips by Burleson Consulting
January 3,  2009

 

Question:  What are the Differences between Data Pump impdp and import utility?  I know that import does the same things as impdp, but I'm not clear on the differences.

Answer:  The original import utility dates back to the earliest releases of Oracle, and it's quite slow and primitive compared to Data Pump.  While the old import (imp) and Data Pump import (impdp) do the same thing, they are completely different utilities, with different syntax and characteristics. 

Here are the major syntax differences between import and Data Pump impdp:

  • Data Pump does not use the BUFFERS parameter
  • Data Pump export represents the data in XML format
  • A Data Pump schema import will recreate the user and execute all of the associated security privileges (grants, user password history).
  • Data Pump's parallel processing feature is dynamic. You can connect to a Data Pump job that is currently running and dynamically alter the number of parallel processes.
  • Data Pump will recreate the user, whereas the old imp utility required the DBA to create the user ID before importing. 

The Oracle docs list syntax differences between the traditional import (imp) and Data Pump (impdp):

Original Import Parameter Comparable Data Pump Import Parameter
BUFFER
A parameter comparable to BUFFER is not needed.
CHARSET
A parameter comparable to CHARSET is not needed.
COMMIT
A parameter comparable to COMMIT is not supported.
COMPILE
A parameter comparable to COMPILE is not supported.
CONSTRAINTS
EXCLUDE=CONSTRAINT
DATAFILES
TRANSPORT_DATAFILES
DESTROY
REUSE_DATAFILES
FEEDBACK
STATUS
FILE
DUMPFILE
FILESIZE
Not necessary. It is included in the dump file set.
FROMUSER
SCHEMAS
FULL
FULL
GRANTS
EXCLUDE=GRANT
HELP
HELP
IGNORE
TABLE_EXISTS_ACTION
INDEXES
EXCLUDE=INDEX
INDEXFILE
SQLFILE with INCLUDE INDEX
LOG
LOGFILE
PARFILE
PARFILE
RECORDLENGTH
A parameter comparable to RECORDLENGTH is not needed.
RESUMABLE
A parameter comparable to RESUMABLE is not needed. It is automatically defaulted for privileged users.
RESUMABLE_NAME
A parameter comparable to RESUMABLE_NAME is not needed. It is automatically defaulted for privileged users.
RESUMABLE_TIMEOUT
A parameter comparable to RESUMABLE_TIMEOUT is not needed. It is automatically defaulted for privileged users.
ROWS=N
CONTENT=METADATA_ONLY
ROWS=Y
CONTENT=ALL
SHOW
SQLFILE
SKIP_UNUSABLE_INDEXES
SKIP_UNUSABLE_INDEXES
STATISTICS
A parameter comparable to STATISTICS is not needed. If the source table has statistics, they are imported.
STREAMS_CONFIGURATION
STREAMS_CONFIGURATION
STREAMS_INSTANTIATION
A parameter comparable to STREAMS_INSTANTIATION is not needed.
TABLES
TABLES
TABLESPACES
This parameter still exists, but some of its functionality is now performed using the TRANSPORT_TABLESPACES parameter.
TOID_NOVALIDATE
A command comparable to TOID_NOVALIDATE is not needed. OIDs are no longer used for type validation.
TOUSER
REMAP_SCHEMA
TRANSPORT_TABLESPACE
TRANSPORT_TABLESPACES (see command description)
TTS_OWNERS 
A parameter comparable to TTS_OWNERS is not needed because the information is stored in the dump file set.
USERID
A parameter comparable to USERID is not needed. This information is supplied as the username/password when you invoke Import.
VOLSIZE
A parameter comparable to VOLSIZE is not needed because tapes are not supported.

For complete details, see the book "Advanced Oracle Utilities".

 
 
 
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Oracle Utility Information 

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