Getting UTL FILE error trying to read from User_TUNE_MVIEW

Question

I am trying to set up a materialized view using the dbms_advisor.tune_mview which works and populates the user_tune_mview table. Supposedly I am supposed to be able to extract the suggested SQL from that table by
a) logging on as sysdba and
i) create directory MYDIR as 'C:\';
ii) grant read,write on directory mydir to grantee (in my case aradmin)
b) logging back on as aradmin (the user) and running,
c)
exec_dbms_advisor.create_file(dbms_advisor.get_task_script('TASK_Number'),
'MYDIR','FIXME.txt');
the last step does not work:
instead I get a cascade of errors other people must have also encountered which are:
ORA-29283: invalid file operation
ORA-06512: at "SYS.UTL_FILE", line 475
ORA-29283: invalid file operation
ORA-06512: at "SYS.PRVT_ADVISOR", line 140
ORA-06512: at "SYS.DBMS_ADVISOR", line 527
ORA-06512: at line 2
Since this is a called oracle package I am at a loss and hope that someone else ran into this and solved it.
thanks in advance.

Answer 1

What version pof the database are you using and what documentation are you reading regarding exec_dbms_advisor. I can not find anything.
This may be related:
Oracle Server Performance Technical Forum
Thread Status: Active
From: [email protected] 09-Nov-05 07:59
Subject: Broken SQL Access Advisor
RDBMS Version: 10.2.0.1.0
Operating System and Version: MS Windows XP SP2
Error Number (if applicable): ORA-13600
Product (i.e. SQL*Loader, Import, etc.): SQL Access Advisor
Product Version:
Broken SQL Access Advisor
When I try to create SQL Access Advisor task
VARIABLE task_id NUMBER;
VARIABLE task_name VARCHAR2(255);
EXECUTE :task_name := 'MYTASK';
EXECUTE DBMS_ADVISOR.CREATE_TASK ('SQL Access Advisor', :task_id, :task_name);
I get this error
begin DBMS_ADVISOR.CREATE_TASK ('SQL Access Advisor', :task_id, :task_name); end;
ORA-13600: error encountered in Advisor
ORA-13635: The value provided for parameter ADJUSTED_SCALEUP_GREEN_THRESH cannot be converted to a number.
ORA-06512: at "SYS.PRVT_ADVISOR", line 3902
ORA-06512: at "SYS.DBMS_ADVISOR", line 102
ORA-06512: at line 1
From: Joze Senegacnik 09-Nov-05 21:59
Subject: Re : Broken SQL Access Advisor
Ivo,
I think you have encountered a bug. I get the same error on my 10.2. The ADJUSTED_SCALEUP_GREEN_THRESH parameter is defined in SYS.WRI$_ADV_DEF_PARAMETERS table having value 1.25. The other similar parameter OVERALL_SCALEUP_GREEN_THRESH has value of 1.5 (this one also causes a procedure crash). Both should be converted to a number type but obviously can't be. If you change their values to 1 and 2 respectively then the procedure successfully completes. Therefore I suspect that this is a bug and the best idea is to log a TAR. If you will not do it, I'll log it.
Regards, Joze
From: Joze Senegacnik 10-Nov-05 07:16
Subject: Re : Broken SQL Access Advisor
Ivo,
Hmmmm..., in my previous post I overlooked the fact that the problem is the NLS setting for decimal point. If you set NLS_LANG=american_america.us7ascii then things work correctly. I would expect that Oracle would do a proper NLS handling inside their package.
The other possibility is to properly set nls_numeric_characters parameter and then run your code.
alter session set nls_numeric_characters='.,';
Sorry for misleading information in my previous post.
Regards, Joze
From: [email protected] 10-Nov-05 07:24
Subject: Re : Broken SQL Access Advisor
That's it! There is a problem with decimal point, while we use comma (',') in Czech as decimal point, and therefore the conversion of '1.25' to number is unsuccessful...
I'm not sure, if this a bug (looks like not-very-clever feature), if you think so, please create a TAR.
Thanks for your help.
From: Joze Senegacnik 10-Nov-05 07:41
Subject: Re : Re : Broken SQL Access Advisor
I don't consider this behaviour a bug. However, I would expect that Oracle would use proper NLS settings internally in the package.
Regards, Joze