|
Oracle 10g
|
-Data Pump Export (Import) Utilities-
In this issue, I will talk about Export/Import Utilities that are used
to transfer data among databases and to create a backup.
Data Pump Export (Import) utilities are newly introduced in Oracle10g
which enable loading/unloading the data extremely quickly.
If you have had troubles with exporting/importing the data, you may be very happy
with this new function. If you haven't used this utility so often, it is a good
opportunity to get to know this useful function.
Even though this new function is called Data Pump Export (Import), this function
does not actually use exp (imp) commands.
Instead, expdp (impdp) commands are newly introduced in Oracle10g.
One thing you have to be aware is that data created with exp command cannot be
loaded to the database with impdp command. You cannot use imp command to
the file that is created with expdp command.
The following are main features of Data Pump Export (Import):
(1)quick export/import operation
(2)transportable tablespace among different types of OS
There are many other features that you may find in documents.
In the next issue, I will further analyze this new function in detail.
I indicate the available parameters below for your reference.
(Excerpts from the document provided by Oracle Corporation)
##############################################################################
$ expdp help=y
Keyword Description (default)
------------------------------------------------------------------------------
ATTACH Attach to existing job, e.g. ATTACH [=job name]
CONTENT Specifies data to unload where the valid keywords are:
(ALL), DATA_ONLY, and METADATA_ONLY.
DIRECTORY Directory object to be used for dumpfiles and logfiles
DUMPFILE List of destination dump files (expdat.dmp),
e.g. DUMPFILE=scott1.dmp, scott2.dmp, dmpdir:scott3.dmp
ESTIMATE Calculate job estimates where the valid keywords are:
(BLOCKS) and STATISTICS
ESTIMATE_ONLY Calculate job estimates without performing the export.
EXCLUDE Exclude specific object types, e.g. EXCLUDE=TABLE:EMP
FILESIZE Specify the size of each dumpfile in units of bytes
FLASHBACK_SCN SCN used to set session snapshot back to
FLASHBACK_TIME Time used to get the SCN closest to the specified time
FULL Export entire database (N)
HELP Display Help messages (N)
INCLUDE Include specific object types, e.g. INCLUDE=TABLE_DATA
JOB_NAME Name of export job to create
LOGFILE Log file name (export log)
NETWORK_LINK Name of remote database link to the source system
NOLOGFILE Do not write logfile (N)
PARALLEL Change the number of active workers for current job
PARFILE Specify parameter file.
QUERY Predicate clause used to export a subset of a table.
SCHEMAS List of schemas to export (login schema)
STATUS Frequency (secs) job status is to be monitored where
the default (0) will show new status when available.
TABLES Identifies a list of tables to export -one schema only.
TABLESPACES Identifies a list of tablespaces to export.
TRANSPORT_FULL_CHECK Verify storage segments of all tables (N)
TRANSPORT_TABLESPACES List of tablespaces from which metadata will be unloaded.
VERSION Version of objects to export where valid keywords are:
(COMPATIBLE), LATEST, or any valid database version
The following commands are valid in interactive mode.
Note: Abbreviations are allowed
Command Description
------------------------------------------------------------------------------
ADD_FILE Add dumpfile to dumpfile set.
ADD_FILE=dumpfile-name
CONTINUE_CLIENT Return to logging mode. Job will be re-started if idle.
EXIT_CLIENT Quit client session and leave job running.
HELP Summarize interactive commands.
KILL_JOB Detach and delete job.
PARALLEL Change the number of active workers for current job.
PARALLEL=
START_JOB Start/resume current job.
STATUS Frequency (secs) job status is to be monitored where
the default (0) will show new status when available.
STATUS=[interval]
STOP_JOB Orderly shutdown of job execution and exits the client.
STOP_JOB=IMMEDIATE‚Í performs an immediate shutdown of the
Data Pump job.
##############################################################################
|
That's it for today.
Yoshihiro Uratsuji
|
|
