Wednesday, July 16, 2008

Data pump Import (impdp) patt #1

Data Pump Import is a utility for loading an export dump file set into a target system. The dump file set is made up of one or more disk files that contain table data, database object metadata, and control information. The files are written in a proprietary, binary format. During an import operation, the Data Pump Import utility uses these files to locate each database object in the dump file set.

Import can also be used to load a target database directly from a source database with no intervening dump files. This allows export and import operations to run concurrently, minimizing total elapsed time. This is known as a network import.

Data Pump Import enables you to specify whether a job should move a subset of the data and metadata from the dump file set or the source database (in the case of a network import), as determined by the import mode. This is done using data filters and metadata filters, which are implemented through Import commands

Invoking Data Pump Import

The Data Pump Import utility is invoked using the impdp command. The
characteristics of the import operation are determined by the import parameters you specify. These parameters can be specified either on the command line or in a parameter file.

Data Pump Import Interfaces

You can interact with Data Pump Import by using a command line, a parameter file, or an interactive-command mode.

1.Command-Line Interface: Enables you to specify the Import parameters directly on the command line. For a complete description of the parameters available in the command-line interface, see Parameters Available in Import's Command-Line Mode


ParameterDescription
Default
attach
connects a client session to a current running data pump import job

content
filters what is import: data_only, metadata_only , all
all
directory
destination of log and dump files
data_pump_dir
dumpfile
name of the dump file

estimate
method used to estimate dump file size : blocks or statistics

estimate_only
Y/N. instruct data_pump whether data should be imported or estimated.
N
exclude
exclude objects and data from being imported.

flashback_scn
scn of the database to flash back to to during imported

full
Y/N. import all data and metadata in a full mode import
N
help
Y/N. display a list of avillable commands and options
N
include
specify which objects and data will be exported

job_name
name of the job
system generated
logfile
name of log file
expdp.log
network_link
source database link for a data pump job importing a remote database

nologfile
a Y/N flag used to suppress log file creation

parallel
set number of workers for the export job
1
parfile
name the parameter file to use

query
filters row from table during the import

schemas
name the schema to be exported for schema mode import

remap_datafiles
change the name fo source datafiles

remap tablespace
change the name fo source tablespace

remap_schema
import data into a new schema

skip_unusable_indexes
a N/Y flag

sql file
name of file in which DDL of the import will be write

table_exists_action
instruct import how to proceed if the table being imported is exist. Values include skip,append,truncate and replace
skip
status
displays detailed status of the data pump job

tables
list of tables and partitions to be exported for table mode import

tablespace
list of tablespaces to import in tablespace mode

transport_full_check
Specifies whether the tablespaces being imported should be verified as a self-contained set.

transport_tablespaces
specifies a transportable tablespace mode import

transport_datafiles
list of datafiles to be imported during a transportable tablespace mode import

version
specifies the version of the database.



Please go part#2
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