Friday, October 24, 2014

IMPDP TABLE_EXISTS_ACTION = APPEND, REPLACE, [SKIP] and TRUNCATE

 

IMPDP  TABLE_EXISTS_ACTION PARAMETER EXPLAINED



 Data Pump IMPDP TABLE_EXISTS_ACTION = APPEND, REPLACE, [SKIP] and TRUNCATE
In conventional import utility (IMP) we have ignore =y option which will ignore the error when the object is already exist with the same name.

When it comes to the data pump there is one enhanced option of ignore=y which is called TABLE_EXISTS_ACTION. The values for this parameter give 4 different options to handle the existing table and data.

$ impdp help=y

    TABLE_EXISTS_ACTION
    Action to take if imported object already exists.
    Valid keywords are: APPEND, REPLACE, [SKIP] and TRUNCATE.

    SKIP: Default value for this parameter is SKIP. This parameter is exactly same as the IGNORE=Y option in conventional import utility.

    APPEND: This option appends the data from the data dump. The extra rows in the dump will be appended to the table and the existing data remains unchanged.

    TRUNCATE: This option truncate the exiting rows in the table and insert the rows from the dump

    REPLACE: This option drop the current table and create the table as it is in the dump file. Both SKIP and REPLACE options are not valid if you set the  CONTENT=DATA_ONLY for the impdp.

   
Method to Import only rows does not exist in the target table
See some examples here.

In this example lets use abc table in my schema (ATOORPU)

SQL> select * from abc;

USERNAME                          USER_ID CREATED
------------------------------ ---------- ---------
eds                                    44 19-DEC-12
rew                                    33 19-DEC-12
ARV                                    70 20-DEC-12
ARVIND                                 69 20-DEC-12
ATOORPU                                64 19-DEC-12
BI                                     63 19-DEC-12

I took the data pump dump export EXPDP of employee table.

oracle@orcl: $ expdp atoorpu directory=DPUMP dumpfile=abc.dmp logfile=abc.log tables=abc

Export: Release 11.2.0.1.0 - Production on Fri Oct 24 09:25:02 2014

Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.
Password:

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Starting "ATOORPU"."SYS_EXPORT_TABLE_01":  atoorpu/******** directory=DPUMP dumpfile=abc.dmp logfile=abc.log tables=abc
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 64 KB
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
. . exported "ATOORPU"."ABC"                             5.921 KB       6 rows
Master table "ATOORPU"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for ATOORPU.SYS_EXPORT_TABLE_01 is:
  /u01/app/oracle/dpump/abc.dmp
Job "ATOORPU"."SYS_EXPORT_TABLE_01" successfully completed at 09:25:36


oracle@qpdbdev201:[/u01/app/oracle/dpump] $ sqlplus atoorpu

SQL*Plus: Release 11.2.0.1.0 Production on Fri Oct 24 09:25:57 2014

Copyright (c) 1982, 2009, Oracle.  All rights reserved.


   ------ TABLE_EXISTS_ACTION=SKIP  ------

In this example I want to use table_exists_action=skip, where I want to skip the table data in my import, if a similar table exists.

oracle@orcl: $ impdp atoorpu directory=DPUMP dumpfile=abc.dmp logfile=abc_imp_skip.log tables=abc table_exists_action=skip

Import: Release 11.2.0.1.0 - Production on Fri Oct 24 09:32:32 2014

Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.
Password:

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Master table "ATOORPU"."SYS_IMPORT_TABLE_01" successfully loaded/unloaded
Starting "ATOORPU"."SYS_IMPORT_TABLE_01":  atoorpu/******** directory=DPUMP dumpfile=abc.dmp logfile=abc_imp_skip.log tables=abc table_exists_action=skip
Processing object type TABLE_EXPORT/TABLE/TABLE
ORA-39151: Table "ATOORPU"."ABC" exists. All dependent metadata and data will be skipped due to table_exists_action of skip
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Job "ATOORPU"."SYS_IMPORT_TABLE_01" completed with 1 error(s) at 09:32:42


    ------     TABLE_EXISTS_ACTION=APPEND    ------

I have deleted and inserted 4 new rows into employee table. So as of now the rows the dump and table are different and I am going to import the dump with APPEND option.

SQL> delete from employee;

4 rows deleted.

SQL> insert into abc (select * from abc_bak);

4 rows created.

SQL> commit;
SQL> select * from abc;

USERNAME                          USER_ID CREATED
------------------------------ ---------- ---------
ARVd                                   70 20-DEC-12
ARVIND2                                69 20-DEC-12
ATOORPUe                               64 19-DEC-12
BIf                                    63 19-DEC-12

$  impdp atoorpu directory=DPUMP dumpfile=abc.dmp logfile=abc_imp_append.log tables=abc table_exists_action=append

Import: Release 11.2.0.1.0 - Production on Fri Oct 24 09:37:34 2014

Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.
Password:

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Master table "ATOORPU"."SYS_IMPORT_TABLE_01" successfully loaded/unloaded
Starting "ATOORPU"."SYS_IMPORT_TABLE_01":  atoorpu/******** directory=DPUMP dumpfile=abc.dmp logfile=abc_imp_append.log tables=abc table_exists_action=append
Processing object type TABLE_EXPORT/TABLE/TABLE
ORA-39152: Table "ATOORPU"."ABC" exists. Data will be appended to existing table but all dependent metadata will be skipped due to table_exists_action of append
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
. . imported "ATOORPU"."ABC"                             5.921 KB       6 rows
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Job "ATOORPU"."SYS_IMPORT_TABLE_01" completed with 1 error(s) at 09:37:42


Now 4 more rows appended to the table. Lets verify that



SQL> select * from abc;

USERNAME                          USER_ID CREATED
------------------------------ ---------- ---------
ARVd                                   70 20-DEC-12
ARVIND2                                69 20-DEC-12
ATOORPUe                               64 19-DEC-12
BIf                                    63 19-DEC-12
eds                                    44 19-DEC-12
rew                                    33 19-DEC-12
ARV                                    70 20-DEC-12
ARVIND                                 69 20-DEC-12
ATOORPU                                64 19-DEC-12
BI                                     63 19-DEC-12

8 rows selected.

        ------ TABLE_EXISTS_ACTION=TRUNCATE     ------ 

    Now let’s try with table_exists_action=truncate option. In truncate option it will truncate the content of the existing table and insert the rows from the dump. Currently my abc table has 8 rows which we inserted last insert.

$   impdp atoorpu directory=DPUMP dumpfile=abc.dmp logfile=abc_imp_trunc.log tables=abc table_exists_action=truncate

Import: Release 11.2.0.1.0 - Production on Fri Oct 24 09:39:39 2014

Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.
Password:

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Master table "ATOORPU"."SYS_IMPORT_TABLE_01" successfully loaded/unloaded
Starting "ATOORPU"."SYS_IMPORT_TABLE_01":  atoorpu/******** directory=DPUMP dumpfile=abc.dmp logfile=abc_imp_trunc.log tables=abc table_exists_action=truncate
Processing object type TABLE_EXPORT/TABLE/TABLE
ORA-39153: Table "ATOORPU"."ABC" exists and has been truncated. Data will be loaded but all dependent metadata will be skipped due to table_exists_action of truncate
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
. . imported "ATOORPU"."ABC"                             5.921 KB       6 rows
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Job "ATOORPU"."SYS_IMPORT_TABLE_01" completed with 1 error(s) at 09:39:46


SQL >  select * from abc


USERNAME                          USER_ID CREATED
------------------------------ ---------- ---------
eds                                    44 19-DEC-12
rew                                    33 19-DEC-12
ARV                                    70 20-DEC-12
ARVIND                                 69 20-DEC-12
ATOORPU                                64 19-DEC-12
BI                                     63 19-DEC-12


        ------ TABLE_EXISTS_ACTION=REPLACE    ------


This option drop the current table in the database and the import recreate the new table as in the dumpfile.

$ impdp atoorpu directory=DPUMP dumpfile=abc.dmp logfile=abc_imp_replace.log tables=abc table_exists_action=replace

Import: Release 11.2.0.1.0 - Production on Fri Oct 24 09:41:59 2014

Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.
Password:

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Master table "ATOORPU"."SYS_IMPORT_TABLE_01" successfully loaded/unloaded
Starting "ATOORPU"."SYS_IMPORT_TABLE_01":  atoorpu/******** directory=DPUMP dumpfile=abc.dmp logfile=abc_imp_replace.log tables=abc table_exists_action=replace
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
. . imported "ATOORPU"."ABC"                             5.921 KB       6 rows
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Job "ATOORPU"."SYS_IMPORT_TABLE_01" successfully completed at 09:42:07


Now if you check the last_ddl_time for the table it would be the same as the import time.


SQL> select OBJECT_NAME, to_char(LAST_DDL_TIME,'dd-mm-yyyy hh:mi:ss') created from dba_objects where OBJECT_NAME='ABC' and owner='ATOORPU';


OBJECT_NAME                    CREATED          
--------------------------             -------------------
ABC                                        24-10-2014 09:42:06

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