Oracle Data Pump in Oracle Database 10g
Oracle Data Pump is een nieuwere, snellere en een meer flexibel alternatief voor de exp en imp utilities die in vorige versie van Oracle werden gebruikt. Naast de basis import en export functionaliteit voorziet data pump in een PL/SQL API en ondersteuning voor externe tabellen.
  • Starten
  • Tabel Exports/Imports
  • Schema Exports/Imports
  • Database Exports/Imports
  • Overige Informatie
  • Data Pump API
  • Externe Tabellen
  • Help

Starten

Om de voorbeelden te laten werken zullen we eerst een object directory creëren die SCOTT kan benaderen:
CONN sys/password@db10g AS SYSDBA
GRANT CREATE ANY DIRECTORY TO scott;

CREATE OR REPLACE DIRECTORY test_dir AS '/u01/app/oracle/oradata/';
GRANT READ, WRITE ON DIRECTORY test_dir TO scott;

Tabel Exports/Imports

De TABLES parameter wordt gebruikt om tabellen te specificeren die geexporteerd moeten worden:

expdp scott/tiger@db10g tables=EMP,DEPT directory=TEST_DIR dumpfile=EMP_DEPT.dmp logfile=expdpEMP_DEPT.log

impdp scott/tiger@db10g tables=EMP,DEPT directory=TEST_DIR dumpfile=EMP_DEPT.dmp logfile=impdpEMP_DEPT.log

DeTABLE_EXISTS_ACTION=APPEND parameter stelt je in staat om data te importeren in bestaande tabellen.

Schema Exports/Imports

De OWNER parameter van exp is vervangen voor de SCHEMAS parameter welke gebruikt wordt om schema's die geëxporteerd moeten worden te specificeren:

Voorbeeld van een export en import syntax:

expdp scott/tiger@db10g schemas=SCOTT directory=TEST_DIR dumpfile=SCOTT.dmp logfile=expdpSCOTT.log

impdp scott/tiger@db10g schemas=SCOTT directory=TEST_DIR dumpfile=SCOTT.dmp logfile=impdpSCOTT.log

Database Exports/Imports

De FULL parameter geeft aan dat je een complete database export wil.

Een voorbeel van een full export en import syntax:

expdp system/password@db10g full=Y directory=TEST_DIR dumpfile=DB10G.dmp logfile=expdpDB10G.log

impdp system/password@db10g full=Y directory=TEST_DIR dumpfile=DB10G.dmp logfile=impdpDB10G.log

Overige Informatie

In tegenstelling tot de originele exp en imp utilities, worden al de data pump ".dmp" en".log" files gecreëerd op de Oracle server, niet op de cliënt machine.

Alle data pump acties worden door meerdere jobs uitgevoerd (servers processen geen DBMS_JOB jobs). Deze jobs voeren de regie over een hoofd proces die gebruik maakt van Advanced Queuing. Tijdens uitvoer wordt er een advanced queue tabel, genoemd naar de job naam, aangemaakt en gebruikt door het hoofd proces. De tabel wordt na eindigen van de datapump job gedropt. De Job en de advanced queue kunnen benoemd worden met de JOB_NAME parameter. Indien het cliënt proces gestopt wordt zal de bijbehorende data pump job niet stoppen. Uitvoeren van een "ctrl+c" op de cliënt stopt de cliënt output en komt met een command prompt. Met het typen van "status" op de prompt kan je de huidige job monitoren:

Export> status

Job: SYS_EXPORT_FULL_01
Operation: EXPORT
Mode: FULL
State: EXECUTING
Bytes Processed: 0
Current Parallelism: 1
Job Error Count: 0
Dump File: D:TEMPDB10G.DMP
bytes written: 4,096

Worker 1 Status:
State: EXECUTING
Object Schema: SYSMAN
Object Name: MGMT_CONTAINER_CRED_ARRAY
Object Type: DATABASE_EXPORT/SCHEMA/TYPE/TYPE_SPEC
Completed Objects: 261
Total Objects: 261
Data pump performance kan verbeterd worden door gebruik te maken van de PARALLEL parameter. Dit zou gebruikt moeten worden in combinatie met de "%U" wildcard in de DUMPFILE parameter zodat meerdere dumpfiles gemaakt kunnen worden of gelezen.
expdp scott/tiger@db10g schemas=SCOTT directory=TEST_DIR parallel=4 dumpfile=SCOTT_%U.dmp logfile=expdpSCOTT.log
De DBA_DATAPUMP_JOBS view kan gebruikt worden om de huidige jobs te monitoren:
system@db10g> select * from dba_datapump_jobs;

OWNER_NAME JOB_NAME OPERATION
------------------------------ ------------------------------ ------------------------------
JOB_MODE STATE DEGREE ATTACHED_SESSIONS
------------------------------ ------------------------------ ---------- -----------------
SYSTEM SYS_EXPORT_FULL_01 EXPORT
FULL EXECUTING 1 1
De INCLUDE en EXCLUDE parameters kan bebruikt worden om de export/import te limiteren tot bepaalde objecten. Als de INCLUDE parameter wordt gebruikt worden alleen die objecten in de export meegenomen die ook gespecificeerd zijn. Als de EXCLUDE parameter wordt gebruikt zullen alle objecten meegenomen worden in de export behalve die worden gespecificeerd:
expdp scott/tiger@db10g schemas=SCOTT include=TABLE:"IN ('EMP', 'DEPT')" directory=TEST_DIR dumpfile=SCOTT.dmp logfile=expdpSCOTT.log

expdp scott/tiger@db10g schemas=SCOTT exclude=TABLE:"= 'BONUS'" directory=TEST_DIR dumpfile=SCOTT.dmp logfile=expdpSCOTT.log

Data Pump API

Met de data pump utilities zorgt Oracle voor een PL/SQL API. Onder een voorbeeld hoe deze API gebruikt kan worden om een schema export te maken:
SET SERVEROUTPUT ON SIZE 1000000
DECLARE
l_dp_handle NUMBER;
l_last_job_state VARCHAR2(30) := 'UNDEFINED';
l_job_state VARCHAR2(30) := 'UNDEFINED';
l_sts KU$_STATUS;
BEGIN
l_dp_handle := DBMS_DATAPUMP.open(
operation => 'EXPORT',
job_mode => 'SCHEMA',
remote_link => NULL,
job_name => 'EMP_EXPORT',
version => 'LATEST');

DBMS_DATAPUMP.add_file(
handle => l_dp_handle,
filename => 'SCOTT.dmp',
directory => 'TEST_DIR');

DBMS_DATAPUMP.add_file(
handle => l_dp_handle,
filename => 'SCOTT.log',
directory => 'TEST_DIR',
filetype => DBMS_DATAPUMP.KU$_FILE_TYPE_LOG_FILE);

DBMS_DATAPUMP.metadata_filter(
handle => l_dp_handle,
name => 'SCHEMA_EXPR',
value => '= ''SCOTT''');

DBMS_DATAPUMP.start_job(l_dp_handle);

DBMS_DATAPUMP.detach(l_dp_handle);
END;
/
Als de Job eenmaal gestart is kan de status bekeken worden met:
system@db10g> select * from dba_datapump_jobs;

Externe Tabellen

Oracle heeft support voor pump technieken in externe tabellen meegeleverd. De ORACLE_DATAPUMP access driver kan gebruikt worden om data te uit te laden in data pump export files en deze daarna weer herladen. Het uit laden van data gebeurd als de externe tabel is gecreëerd met de "AS" clause:
CREATE TABLE emp_xt
ORGANIZATION EXTERNAL
(
TYPE ORACLE_DATAPUMP
DEFAULT DIRECTORY test_dir
LOCATION ('emp_xt.dmp')
)
AS SELECT * FROM emp;
De data kan bekeken worden met:
SELECT * FROM emp_xt;
De syntaxis om een externe tabel te creëren die naar een bestaande file wijst is gelijk maar zonder de "AS" clause:
DROP TABLE emp_xt;

CREATE TABLE emp_xt (
EMPNO NUMBER(4),
ENAME VARCHAR2(10),
JOB VARCHAR2(9),
MGR NUMBER(4),
HIREDATE DATE,
SAL NUMBER(7,2),
COMM NUMBER(7,2),
DEPTNO NUMBER(2))
ORGANIZATION EXTERNAL (
TYPE ORACLE_DATAPUMP
DEFAULT DIRECTORY test_dir
LOCATION ('emp_xt.dmp')
);

SELECT * FROM emp_xt;

Help

De HELP=Y optie laat de beschikbare parameters zien:
expdp help=y

Export: Release 10.1.0.2.0 - Production on Tuesday, 23 March, 2004 8:33

Copyright (c) 2003, Oracle. All rights reserved.


The Data Pump export utility provides a mechanism for transferring data objects
between Oracle databases. The utility is invoked with the following command:

Example: expdp scott/tiger DIRECTORY=dmpdir DUMPFILE=scott.dmp

You can control how Export runs by entering the 'expdp' command followed
by various parameters. To specify parameters, you use keywords:

Format: expdp KEYWORD=value or KEYWORD=(value1,value2,...,valueN)
Example: expdp scott/tiger DUMPFILE=scott.dmp DIRECTORY=dmpdir SCHEMAS=scott
or TABLES=(T1:P1,T1:P2), if T1 is partitioned table

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 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 while 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 performs an immediate shutdown of the
Data Pump job.



impdp help=y

Import: Release 10.1.0.2.0 - Production on Saturday, 11 September, 2004 17:22

Copyright (c) 2003, 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.
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 (Y/N) to specific objects.
Valid transform keywords: SEGMENT_ATTRIBUTES and STORAGE.
ex. TRANSFORM=SEGMENT_ATTRIBUTES:N:TABLE.
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=.
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.
STATUS=[interval]
STOP_JOB Orderly shutdown of job execution and exits the client.
STOP_JOB=IMMEDIATE performs an immediate shutdown of the
Data Pump job.
Zie ook dpdump over het netwerk 
 

Advertentie

>

Poll

Voorkeur
 

Wie is er aanwezig

We hebben 161 gasten online