Question

Oracle 10G datapump

Asked by: fireword

Hi
I have an Oracle 10G database where we currently import data from another 10G database using the impdp facility initiated by a unix shell script. This works fine and takes about 40 minutes.
Later in the year we have to migrate onto another platform where we will not be able to use this method.
I am investigating using the dbms_datapump utility from within pl/sql and have hit on a couple of problems.
Problem 1 is that trying to import the data within a named PL/SQL procedure fails with the NO_SUCH_JOB error. However, if i use the exact same code within an anonymous pl/sql block then the code runs to completion and the data is imported.
Problem 2 is that although the import worked in the anonymous pl/sql block it took 15 hours to complete.

Any ideas on getting it to execute within a named pl/sql procedure and achieving an execution time in keeping with it being called externally thru impdp.
Regards

test-proc-impdp.txt
- 3 KB
PL/SQL Procedure code used

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Asked On: 2009-01-30 at 02:33:14ID24097871
Tags: Oracle
,; datapump
,; impdp
,; PL/SQL
Topics: Oracle CRM
,; Oracle 10.x
,; PL / SQL
Participating Experts: 2
Points: 250
Comments: 15

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Answers

by: schwertnerPosted on 2009-01-30 at 03:26:55ID: 23507053

I use PL/SQL data pump API for third year and it works perfect.

PROCEDURE phr_impdp(p_dump VARCHAR2, p_dir VARCHAR2) IS
  l_dp_handle       NUMBER;
  l_last_job_state  VARCHAR2(30) := 'UNDEFINED';
  l_job_state       VARCHAR2(30) := 'UNDEFINED';
  l_sts             KU$_STATUS;
  v_date            DATE;
  v_date_part       VARCHAR2(55);
  v_file_dump_name  VARCHAR2(55); 
  v_file_log_name   VARCHAR2(55);
  v_dir             VARCHAR2(55) := upper(p_dir);
  v_value           VARCHAR2(4000) := 'IN (';
  v_first           CHAR := '0';
  v_sid             VARCHAR2(55);
  v_instance        VARCHAR2(55);
  v_host            VARCHAR2(55);
  v_count           INTEGER;
  v_count1          INTEGER;
  v_kill            VARCHAR2(400);
  v_exists          NUMBER;
  error_dir_file    EXCEPTION;
  v_encryption      VARCHAR2(55) := 'walldorf';
  v_sql             VARCHAR2(4000);
  v_error_count     INTEGER;
  v_job_name        VARCHAR2(55); 
  
BEGIN
  
  dbms_output.enable(100000);
  --
  --  Check if the directory is known to Oracle
  --
  check_dir_file(p_dir, p_dump, v_exists);
  IF v_exists <> 1 THEN
     raise error_dir_file;
  END IF;
  --
  dbms_output.put_line('Import of the Dump file '|| p_dump);
  dbms_output.put_line('into the following DB using Oracle:');
 
  -- makes unique name for the  Log file
  SELECT sysdate INTO v_date FROM dual;
  select instance_name into v_sid from v$instance;
  v_date_part := 'ImpDP_' || TO_CHAR(v_date,'MMDDYYYY_HH24MISS') || '_' || v_sid;
  v_job_name := 'PHR_imp' || SUBSTR(v_date_part,18,4);
  v_file_log_name := v_date_part || '.log';  
 
  SELECT instance_name, host_name 
  INTO v_instance, v_host
  FROM v$instance;
  dbms_output.put_line('Instance Name: ' || v_instance);
  dbms_output.put_line('Host Name: ' || v_host);
 
  -- code that does following:
  -- 1. kills all sessions to the particular PHR schemas
  -- 2. drops all PHR7 or NHIF schemas
 
   phr_clrsch('kill','drop','not_change');
 
 
  -- creates entries in the DBMS_DATAPUMP package API
  l_dp_handle := DBMS_DATAPUMP.open(
    operation   => 'IMPORT',
    job_mode    => 'FULL',
    remote_link => NULL,
    job_name    => v_job_name,
    version     => 'LATEST');
 
  DBMS_DATAPUMP.add_file(
    handle    => l_dp_handle,
    filename  => p_dump,
    directory => v_dir,
    filetype  => DBMS_DATAPUMP.KU$_FILE_TYPE_DUMP_FILE);
 
  DBMS_DATAPUMP.add_file(
    handle    => l_dp_handle,
    filename  => v_file_log_name,
    directory => v_dir,
    filetype  => DBMS_DATAPUMP.KU$_FILE_TYPE_LOG_FILE);
 
  DBMS_DATAPUMP.SET_PARALLEL(
    handle    => l_dp_handle,
    degree    => 4);
 
/* works 11g
  DBMS_DATAPUMP.set_parameter(
    handle => l_dp_handle,
    name   => 'ENCRYPTION_PASSWORD',
    value  =>   v_encryption
                               );
*/
 
  DBMS_DATAPUMP.start_job(l_dp_handle);
 
  DBMS_DATAPUMP.detach(l_dp_handle);
 
  --
  -- Wait the job to finish
  --
 
  syncr(v_job_name);
 
  dbms_output.put_line('Import successfully finished.');
  
EXCEPTION 
  WHEN error_dir_file THEN
     dbms_output.put_line('Errors by the Export encountered.');
     IF v_exists = -1 THEN
        dbms_output.put_line('Wrong Logical Directory ' || p_dir);
     ELSIF v_exists = -2 THEN
        dbms_output.put_line('Wrong Dump File ' || p_dump);
     END IF;
     raise_application_error(-20100, 'Error in phr_expdp!');
  WHEN OTHERS THEN
     dbms_output.put_line('Errors by the Import encountered.');
     dbms_output.put_line(substr(sqlerrm,1,254));
     DBMS_DATAPUMP.stop_job(
        handle => l_dp_handle,
        immediate => 1,
        keep_master => 0);
     DBMS_DATAPUMP.detach(l_dp_handle);
     raise_application_error(-20100, 'Error in  phr_impdp!');
 
END phr_impdp;

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by: firewordPosted on 2009-01-30 at 06:41:47ID: 23508596

Hi
Thanks for that, it is very similar to what I'm currently doing but I have taken a couple of tips from your code and applied them to mine to see if it will work.
However without any luck, as before, it will execute from an sqlplus session as an anonymous pl/sql block. But when inside a procedure and called via exec e.g exec p_test_impdp it fails, seemingly because it cannot create the master table required for the job handle.
Is there something in the roles/privileges within Oracle that gives different behavior between anonymous pl/sql and explicit pl/sql?
The error i am getting is :-
ORA-31626: job does not exist
ORA-31633: unable to create master table
"OPS$NIKU_MI.SYS_IMPORT_TABLE_23"
ORA-06512: at "SYS.DBMS_SYS_ERROR", line
95
ORA-06512: at "SYS.KUPV$FT", line 863
ORA-01031: insufficient privileges

by: schwertnerPosted on 2009-01-30 at 06:51:41ID: 23508721

The bad news is that it doesnt work on Oracle before 10.2.0.1
On 10.2.01 and higher it works fine under SYS account.
Also the directory should physically exist on the place mentioned,
there should not be logs with the name you use.
It works ...

But your DB (if upgraded) can be non consistent - upgrade software, not upgraded
Data base tables.

by: firewordPosted on 2009-01-30 at 07:02:53ID: 23508861

The version of the database is 10.2.0.3
The directory does exist, the extract file i am trying to load using dbms_datadump through PL/SQL is the same as the one we currently load using impdp.

The logs I have specified were created fine when called from an anonymous pl/sql block and the data was imported successfully albeit extremely slow.

by: sdstuberPosted on 2009-01-30 at 07:03:43ID: 23508867

I (and Oracle also) highly recommend you do NOT run any application code as SYS.
other than startup/shutdown and installs you should never have to do anything as SYS.
It's a bad practice to get into.

The difference between anonymous pl/sql block and a compiled procedure is, the anonymous block will run with the permissions of whomever is logged in at that time.

The compiled procedure will run with the permissions of the procedure's owner.
And, since dbms_datapump is AUTHID CURRENT_USER, the "current" user will be the procedures' owner, regardless of who invokes it.

by: schwertnerPosted on 2009-01-30 at 07:05:42ID: 23508897

Migrating to 10.2.0.3 did you run the catupgrade.sql script to upgrade the
Dictionary?
What says this:

set linesize 10000
SELECT SUBSTR(comp_id,1,15) comp_id, status, SUBSTR(version,1,10)
version, SUBSTR(comp_name,1,30) comp_name
FROM dba_registry ORDER BY 1;

If the version of the components CATALOG, CATPROC, XDB (among others) is lower than the patch-set version that you have applied, re-run the script catpatch.sql after a startup migrate. See the readme file of the patch-set for all these mandatory post-installation instructions.

by: firewordPosted on 2009-01-30 at 07:30:55ID: 23509187

For Schwertner

Component versions for CATALOG, CATPROC and others are all set to 10.2.0.3.

For Sdstuber

Nothing is running under SYS!
Your comments re AUTHID is very useful. I've put the procedure into a package and defined it as AUTHID CURRENT_USER, the job is currently executing as a named procedure which resolves the first of my problems.
The next issue to resolve is why it should be 22½ times slower loading the same file using dbms_datapump compared with impdp.

by: sdstuberPosted on 2009-01-30 at 07:34:46ID: 23509238

are you having network issues between databases while impdp is loading a file you have already transferred to the target server?

by: firewordPosted on 2009-01-30 at 07:56:16ID: 23509542

The .dmp file is on the same unix server as the database so I don't think that's an issue

by: sdstuberPosted on 2009-01-30 at 08:02:48ID: 23509641

which database? the target db? If so, that's probably why it's so fast, it's loading directly opposed to dbms_datapump which must negotiate sqlnet traffic

by: firewordPosted on 2009-01-30 at 08:23:19ID: 23509905

yep, the target db is on the same server.
I'm running it this time with a parallel option and it does appear to be doing lots more than it was yesterday. There is one table that is over 6gb in size that takes the bulk of the time.
will leave it running and info later/

by: schwertnerPosted on 2009-01-30 at 09:03:42ID: 23510428

If you see ALERT<sid>.LOG file you will see the reason.
I see it right now.
You will see delay of ONLINE REDO LOF switch because of
noncompleted checkpoint.
This causes the error.
In this case you have to increase the number of the online redo log
groups and to separate them on different disk device.
The database and the dump file also should be separated.
I know this issue very good, if you run 10.2.0.4 you will see
also the a lot of messages that a disk operation uses more then 500 msec.
to finish.
Simply your disk 'farm" is overloaded.

by: firewordPosted on 2009-01-30 at 10:51:45ID: 23511518

Hi Schwertner

Thanks for that, I am not the DBA so can't access the alert logs. I will raise your points with the DBA next week.
One of the reasons I'm looking at using pl/sql dbms_datapump rather than impdp is that we are migrating the database onto a new server where we won't have the same access to be able to tun impdp. The likelihood here is that the actual extract dump file will be in a different location to the database so that issue will resolve itself, however I'm not able to test this directly and am really just doing proof of concept development at the moment.

by: schwertnerPosted on 2009-01-30 at 12:14:26ID: 23512413

Data Pump works ONLY on the server.
So everything is there - no option.
But I programmed a procedure that reads the files in the directory and
delivers the user the Data Pump log file.
Be aware that DBMS_DATAPUMP enables only a part of the parameters
of EXPDP and IMPDP.
Be aware that up to 10.2.0.3 due bugs NLS character set transformations do not work with Data Pump. Possibly 10.2.0.4 will be better.

by: firewordPosted on 2009-02-02 at 02:24:29ID: 31540882

Each of the experts provided information that enabled me to progress further with the problems i was encountering than i had been able to.

20120131-EE-VQP-002

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Oracle 10G datapump

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Oracle

datapump

impdp

PL/SQL

Oracle CRM

Oracle 10.x

PL / SQL

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