||Oracle Tips by Burleson
Oracle10g Grid Computing
Chapter 17 -
Oracle’s Grid Integration Technologies
Parameters for Data Pump Import
reuse_datafiles – If the
datafile specified in the CREATE TABLESPACE statement already exists,
and the value of this parameter is set to N (default), then an error
message is issued. However, the import job will continue. If the
value is set to Y, a warning message is issued and the existing
datafile is reinitialized. However, this may result in a loss of
schemas – This
specifies a list of schemas to import. The schemas themselves are
first created, including system and object grants, password history,
and so on. Then all objects contained within the schemas are imported.
Non-privileged users can specify only their own schemas and no
information about the schema definition is imported.
specifies a file that will capture all the SQL DDL that the Import
utility will be executing based on other parameters. The SQL statement
is not executed, and the target database remains unchanged. You can
first edit the new SQL file with modifications and then run it on the
target database. This is similar to the method used in the original
export and import utilities in which export is run with ROWS=N and
then import is run with SHOW=Y.
table_exists_action – This
instructs the import utility on what to do if the table it is trying
to import already exists. This parameter is similar to the IGNORE
parameter in the original import utility, yet it has more options (see
SKIP – This
leaves the table unchanged and moves on to the next table (SKIP is the
This appends new rows from the source to the existing table.
This deletes existing rows and then loads the row from the source.
This drops the existing table, creates the new table according to the
source table definition, then loads the source data. (Tip: When you
use APPEND or TRUNCATE, checks are made to ensure that rows from the
source are compatible with the existing table prior to performing any
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