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  1. #1
    Join Date
    Dec 2003

    Unanswered: Using impdp to restore entire db

    If we're using impdp to restore an entire db, is it better to drop the database, re-create it, then perform the impdp? Or can we perform the impdp directly over the existing incarnation?


  2. #2
    Join Date
    Aug 2003
    Where the Surf Meets the Turf @Del Mar, CA
    Provided Answers: 1
    better? based upon what metric(s)?
    Might it depend upon which command line qualifiers specified?
    <> impdp help=yes
    Import: Release - 64bit Production on Thursday, 17 May, 2007 10:03:51
    Copyright (c) 2003, 2005, Oracle.  All rights reserved.
    The Data Pump Import utility provides a mechanism for transferring data objects
    between Oracle databases. The utility is invoked with the following command:
         Example: impdp scott/tiger DIRECTORY=dmpdir DUMPFILE=scott.dmp
    You can control how Import runs by entering the 'impdp' command followed
    by various parameters. To specify parameters, you use keywords:
         Format:  impdp KEYWORD=value or KEYWORD=(value1,value2,...,valueN)
         Example: impdp scott/tiger DIRECTORY=dmpdir DUMPFILE=scott.dmp
    USERID must be the first parameter on the command line.
    Keyword               Description (Default)
    ATTACH                Attach to existing job, e.g. ATTACH [=job name].
    CONTENT               Specifies data to load where the valid keywords are:
                          (ALL), DATA_ONLY, and METADATA_ONLY.
    DIRECTORY             Directory object to be used for dump, log, and sql files.
    DUMPFILE              List of dumpfiles to import from (expdat.dmp),
                          e.g. DUMPFILE=scott1.dmp, scott2.dmp, dmpdir:scott3.dmp.
    ENCRYPTION_PASSWORD   Password key for accessing encrypted column data.
                          This parameter is not valid for network import jobs.
    ESTIMATE              Calculate job estimates where the valid keywords are:
                          (BLOCKS) and STATISTICS.
    EXCLUDE               Exclude specific object types, e.g. EXCLUDE=TABLE:EMP.
    FLASHBACK_SCN         SCN used to set session snapshot back to.
    FLASHBACK_TIME        Time used to get the SCN closest to the specified time.
    FULL                  Import everything from source (Y).
    HELP                  Display help messages (N).
    INCLUDE               Include specific object types, e.g. INCLUDE=TABLE_DATA.
    JOB_NAME              Name of import job to create.
    LOGFILE               Log file name (import.log).
    NETWORK_LINK          Name of remote database link to the source system.
    NOLOGFILE             Do not write logfile.
    PARALLEL              Change the number of active workers for current job.
    PARFILE               Specify parameter file.
    QUERY                 Predicate clause used to import a subset of a table.
    REMAP_DATAFILE        Redefine datafile references in all DDL statements.
    REMAP_SCHEMA          Objects from one schema are loaded into another schema.
    REMAP_TABLESPACE      Tablespace object are remapped to another tablespace.
    REUSE_DATAFILES       Tablespace will be initialized if it already exists (N).
    SCHEMAS               List of schemas to import.
    SKIP_UNUSABLE_INDEXES Skip indexes that were set to the Index Unusable state.
    SQLFILE               Write all the SQL DDL to a specified file.
    STATUS                Frequency (secs) job status is to be monitored where
                          the default (0) will show new status when available.
    STREAMS_CONFIGURATION Enable the loading of Streams metadata
    TABLE_EXISTS_ACTION   Action to take if imported object already exists.
                          Valid keywords: (SKIP), APPEND, REPLACE and TRUNCATE.
    TABLES                Identifies a list of tables to import.
    TABLESPACES           Identifies a list of tablespaces to import.
    TRANSFORM             Metadata transform to apply to applicable objects.
                          Valid transform keywords: SEGMENT_ATTRIBUTES, STORAGE
                          OID, and PCTSPACE.
    TRANSPORT_DATAFILES   List of datafiles to be imported by transportable mode.
    TRANSPORT_FULL_CHECK  Verify storage segments of all tables (N).
    TRANSPORT_TABLESPACES List of tablespaces from which metadata will be loaded.
                          Only valid in NETWORK_LINK mode import operations.
    VERSION               Version of objects to export where valid keywords are:
                          (COMPATIBLE), LATEST, or any valid database version.
                          Only valid for NETWORK_LINK and SQLFILE.
    The following commands are valid while in interactive mode.
    Note: abbreviations are allowed
    Command               Description (Default)
    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=<number of workers>.
    START_JOB             Start/resume current job.
                          START_JOB=SKIP_CURRENT will start the job after skipping
                          any action which was in progress when job was stopped. 
    STATUS                Frequency (secs) job status is to be monitored where
                          the default (0) will show new status when available.
    STOP_JOB              Orderly shutdown of job execution and exits the client.
                          STOP_JOB=IMMEDIATE performs an immediate shutdown of the
                          Data Pump job.
    You can lead some folks to knowledge, but you can not make them think.
    The average person thinks he's above average!
    For most folks, they don't know, what they don't know.
    Good judgement comes from experience. Experience comes from bad judgement.

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