JExport vs DATAEXPORT

Hi,
I'm exporting data out of a huge planning cube with 14 dimensions. Does anyone better which method is better? JExport or DATAEXPORT. I've tried DATAEXPORT on a subset of data with dynamic calc turned off. The performance seems to be ok without dynamic calc. Any thoughts on JExport? Can I export out the dynamic calc members using JExport without degrading the performance? Thanks.
Regards,
Gerd

Hi,
I can't really say which is going to be faster in your circumstances, sometimes you just have to try and see, though what I will say is that if you are going to export dynamic calculated members then there is always going to be a performance hit, if you think about it the data for the dynamic members doesn't yet exist so it has to calculate them on the fly when you are exporting, depending on the amount of dynamic calc members and what they depend on will shape the way performance is going to be hit, in some cases this can be a massive hit in performance.
Cheers
John
http://john-goodwin.blogspot.com/

Similar Messages

Jexport CDF issue with Calc Manager

I have JEXPORT function which works fine as a essbase calc script.But when I try to validate in Calc Manager using EPMA Hyperion 11.1.1.3 ,It gives error
'Error:Unable to resolve UDA,attribute member or dimension member with value,name or type "" rule Capex.Capex.CAP_Jexport'
Note :It is a EPMA Application.
Can we not use CDF in calc manager fro EPMA?

Try using [url http://download.oracle.com/docs/cd/E17236_01/epm.1112/esb_tech_ref/dataexport.html]@DAYAEXPORT
JExport was written as a stop-gap until the native data import and export functions could be added to the Calc library.
Calc dataexport is very fast.
Regards,
Robb Salzmann

DATAEXPORT - Can the output to the file be changed

Hi,
I have a working DATAEXPORT calc. However I was wondering if there is a way to change the output that ends up in the file? Currently it is putting the dimensions in an order that does not coincide with my fix statement. I assume Essbase just knows the optimal output order or something. I basically want to change the output order and then maybe eliminate some columns and possibly concatenate two together with a '_'. Is this possible within the calc itself?
//ESS_LOCALE English_UnitedStates.Latin1@Binary
SET DATAEXPORTOPTIONS
DataExportDECIMAL 4;
DataExportRELATIONALFILE ON;
DataExportOVERWRITEFILE ON ;
DataExportDynamicCalc OFF;
DataExportDimHeader ON;
DataExportCOLHEADER "PERIOD";
/* Exports zero level data to specified directory */
FIX (
@Descendants("NU_Consolidated",0),
@Descendants("TOTCO_FERC",0),
@Descendants("NU_Actv",0),
@Children("YEARS"),
"NU_RESC",
"TOT_SCCC",
"TOT_CCCC",
"Charge_Type_Total",
"Final",
"Budget"
DATAEXPORT "File" "|" "/essbase111/cfa_test_090909.txt";
ENDFIX

Sorry Sam,
Dataexport does things in the most efficient way possible so it dies not allow you to order the dimensions. It also does not let you drop columns. The two options you have are:
1. Export to a relationsal table where you can then have a sql (dts or otherwise) reorder the columns, remove unwanted columns, concatinate columns, etc
2. write a perl or vb or other program to post process the file to be what you want
I would have offered using the jExport cdf as an alternative since it will do what you want, but I know you are not allowed it in your environment

DATAEXPORT file in custom defined Order?

Hi ,
I had a requirement to export Lev0 (Dynamic Calc) data from BSO application. I am able to do the export by using "DATAEXPORT" function, but the export file contain the default order as per dimensions design from outline.
I am pretty sure that i can do from the UDF fictions like "JExport", but my company policy won't entertain us to use CDF/UDF.
Appreciate if you Could suggest is there any way to export the data in custom defined order by using "DATAEXPORT" function?
Thanks,
Sriknath Reddy.

in dataexport, the column order is dictated by the dense and sparse dimensions and the dimension order in the outline. You could change but it could have performance impacts on other things. Another option would be to export into a relational table then you could extract from there in any order yo0u want. If this is not an option , the perhaps a report script

DATAEXPORT to RDBMS - changing column dim from Accounts to Time

While performing a DATAEXPORT to Oracle using DSN, the format of the table created has the members of the Accounts dimension in the columns and the other dimensions in the rows. Is is possible to change the column dimension from Accounts to Time while exporting data to RDBMS using the DATAEXPORT command?
The problem is that I have around 1000 members in the Accounts dimension and cannot have that many columns in my table. Is it possible to manually define the column dimension while using the DATAEXPORT command? I can use the Jexport cdf, but I am not sure if I will get the same performance as the DATAEXPORT with the bulk insert options.
Thanks,
FJ

Thanks for the quick reply, Glenn.
But, I did go through the technical reference and it mentions that the DataExportColHeader option can only be used with text files and I am trying to export to a relational database.
Regards,
Francis

Extracting Data via DATAEXPORT command in CalcScript

Hi
I have cube with the following dimensions :-
Accounts - ACC1 , ACC2 , ACC3
Years - 2005 , 2006 , 2007 , 2008 , 2009 , 2010 , 2011 , 2012
Region - R1 , R2 , R3 , R4
Product - P1, P2 , P3
Now these members above are just for examples. I want to export the zero level data for 2005, 2006 , 2007 , 2008 , 2009 , 2010 and I want the output in the following format : -
Acc1,2005,R1,P1,"DATA"
Acc2,2005,R1,P1,"DATA"
Acc3,2005,R1,P1,"DATA"
Acc1,2006,R1,P1,"DATA"
Is it possible to get such an output, I pretty new to essbase, would be great if someone can explain how?
Thanks in advance

assuming you only had those four dimensions, then using dataexport it is not possible, you have to have at least one column that is from a dense dimension. Assuming a report script or jexport cdf, the same is true. You always need to have something that represents the columns.

DATAEXPORT Calc Script Command

Whether Data Export is faster than JEXPORT ? (True/False)

I tend to believe that Dataexport is good for bulk data export and Jexport is good for formatted data export.
Jexport gives you more flexibility as to which data with what condition needs to be extracted and maybe that's why it's still my favorite.
Cheers,
Alp

JExport cdf function working - but changing essbase files ?

Hello,
we finally managed to get CDF JEXPORT function running
(Link http://www.jasonwjones.com/?p=68 was very helpful)
now we scheduled daily exports to txtfiles and oracle database - it's running well - we scheduled to export every night from testdatabase and productiondatabase -
but I noticed, that it's now changing the essbase *.pag and *.ind files last-accessed-datestamps (not all of our 100 GB -but obviously those we fix the export to)
as we run daily incremental backups and essbase has to be offline during that time, this causes us several hours of offline time every night - because additional 50 GB of data have to be secured - the dataexport command does not change the files but jexport does
-> did anymody notice something like this ? jexport changing datestamps of *.pag and *.ind files ?
my common understanding is that an export is reading data and should not change files - as we want to export attributes we can not use dataexport command
of course I am aware of workarounds like: use dataexport command, do not export every day, buy a faster backupserver, run restructure so that the relevant data is in fewer datafiles - but still hoping that there is a better solution.
regards
Rodian

Hi,
thank you for being interested into the issue
we use the new essbase / hyperion planning / epm 11.1.2.1 64 bit on windows 2008 R2-
maybe you or somebody else has an idea or we really didn't see the easy way
what we need is a fast export of essbase data combined with alias member names and attribute member names
dataexport command seems not to allow to export essbase data combined with/sorted/fixed by attribute dimensions - we realized already that dataexport is much faster (15 min instead of 24 hours for the major export part - so we ended up with a combined approach already (it was already tricky to get jexport running exporting to oracle tables):
1 dataexport script (15 min runtime for all real essbase budget data using dataexport to file and 2 jexport scripts (5 min each), which we actually just use to derive the corresponding attribute dimension values for those of the 5000 members, which are used for budgeting in the selected planning scenario
We managed jexport to export to oracle database directly, while dataexport we managed only to export to file (so it needs another script to import into oracle database again)
Furthermore, we needed also the alias values of each member - which dataexport and jexport did not deliver - so we had to use sql statements to derive it from the hyperion planning application oracle tables hsp_object and hsp_alias
at the end, the result of the 3 calcscripts and the alias names from the hyperion planning oracle table have to be written to 2 txt files, which get delivered to SAP on daily basis - the reason why we ended up with such a wild mix of scripts is obviously that SAP and the other involved planning system defined the data to be delivered
as we have only 2 interfaces and 2 planning/essbase applications and limited financial budgets, it appeared too big effort to invest time into ODI (still open, what the cost of this would have been, if the scripts could be scheduled and would be fast)
all scripts are scheduled and run daily and are very reliable - with the only disadvantage, that the queried *.pag and *.ind (not all files change) files tend to change datestamp every night now.
I clearly identified jexport the root of it.
we managed outline extractor utility 11.1.2.0 running as well on 11.1.2.1 - but looks like this can not scheduled and allows only to export the pure value lists of attributes and members
the only thing i could test is placing the jexport script into a hyperion planning businessrule instead of an essbase calc script and exporting to textfile only (but I expect same result)
so the only remaining alternative might be to extract also the attribute dimension values (hsp_member_to_attribute) for our members from the hyperion planning oracle tables and combine them with our essbase data
so what we actually miss is an essbase dataexport command, which allows to export essbase data with attribute values and member names from alias tables directly into oracle tables (ok, to a flat file would be ok as well)
regards
Rodian

Using an essbase substitution variable in dataexport command in a BR

Hi,
I have created a calc script to export data using DATAEXPORT, and to define the filename an essbase variable.
Here all right
I copy this code to a business rules to run it from a business rules, but I have a problem with the essbase variable, when I validate it, it gives me the error:
Detail:Encountered "&FileNm" at line 28, column 26.
Was expecting:
My essbase variable is set to:
"e:\Hyperion\products\Essbase\EssbaseServer\app\TMPGB\dataexportCustomerY2.txt"
in double quote
How anyone use in a Business rules with the command dataexport an essbase substitution variable

So it works in a calc script and not a BR, I know BR's sometimes don't always act exactly the same as calc scripts and you occassionally hit issues like this.
What version are you using because I have a feeling I have tested this in the past and I am sure it worked.
Cheers
John
http://john-goodwin.blogspot.com/

DataExport in Business Rules

Hi,
is there a way to make the DataExport calcscript command works in Business Rules ?
I made the script below to export data in a calcscript and it works fine.
//ESS_LOCALE French_France.MS1252@Default
SET DATAEXPORTOPTIONS
DataExportLevel "LEVEL0";
DataExportRelationalFile ON;
DataExportOverwriteFile ON;
DataExportDecimal 2;
DATAEXPORTDIMHEADER OFF;
FIX ("Probables", "FY08","Officielle",@RELATIVE("E23",0));
DATAEXPORT "File" "," "D:\Hyperion\AnalyticServices_LTQuebec\APP\LTQuebec\Finance\Dump_Data\TestBV_SBQ.txt" "#MI";
ENDFIX;
The main objective is to have a level-0 file of all data for a specific version, scenario, year and entity. This file will be used (after modification like inluding alias and comments from Planning) as a reference by users.
Now, I would like to move it in a business rule to be able to pass parameters from a Planning form.
In my example "E23" is an entity and I would like it to change to follow user security in Planning (user will not be able to choose other entity than those they can access in Planning).
I tried to do it in a report but it is too slow as we have 12 dimensions, 3 of them having more than 1000 members.
Is anybody did something similar before (using DataExport or another method) ?
Thanks

Hi John,
my problem is not with DataExport performance, which is really fast (5 seconds or less). We have only level-0 members included in the export and none currently has dynamic calc.
The performance issue is with reports that take a long time to generate as we have 1000+ Activity * 1000+ Products * 1000+ Sectors so, basically 1,000,000,000 cells * the numbers of entities included. Last time I ran my test report, it ran for 6 hours before I killed it. Even with "Suppress Missing", it seems to try to extract all data first and remove missing after.
This is why we changed to DataExport, which is more efficient. But the fact that DataExport seems to be unrecognized by business rules cause me the problem that I can't use parameters and users will be able to see entities that are not their own (unless I create 200 scripts, one for each users, which will not really be a solution).
Thanks

DataExport Syntax Error in Business Rules

I am having issues trying to create a data export business rule in version 9.3.1. The syntax works fine as a calc script but when I copied it to a business rule I get a syntax error at the first bracket ({) after the 'DATAEXPORTOPTIONS.' The error says it was expecting "\", "]]", <SUBST_VARIABLE>...
The script is pretty simple:
SET DATAEXPORTOPTIONS
DataExportColFormat ON;
DataExportColHeader "Account";
DataExportOverwriteFile ON;
FIX(&ActYear, "Plan","Working.DIV","Local","USD","EUR""HSP_InputValue",@LEVMBRS("Entity",0),"Patch_US","Total Employees")
FIX(@REMOVE(&LastClosedMonth:"Dec",&LastClosedMonth))
FIX("RegularWages","MeritInc","FICATax","FUTATax","SUTATax","IntlTax",@DESCENDANTS("HCFT"),@DESCENDANTS("HCPT"),@DESCENDANTS("HCInt"))
DATAEXPORT "File" "," "F:\Hyperion\AnalyticServices\app\AOLWFP\WrkForce\Exp_WrkForce_ActYear.txt";
ENDFIX
ENDFIX
ENDFIX
I know the data export would not work with business rules unless you have at least patch version 9.3.1.1.5. This shouldn't be an issue:
EAS - 9.3.1.4
BR - 9.3.1.1.11
Planning - 9.3.1.1.12.5
Has anyone come across this before? Any help would be greatly appreciated.
-John

Thank you for pointing this out.
I'm currently browsing metalink kb but "7021469 - Business Rules should support dataexport and dataimportbin functionality" provides no results.
hbr_93300_readme.pdf refers indeee to that issue but I cannot upgrade to that version (because, as stated in that pdf, I should upgrade all prouducts to 9.3.3)
You said it might be solved in Administration Services release 9.3.1.5 (I believe 9.3.1.1.5 was a typo), but the readme does not mention it...

DATAEXPORT to sql server is giving error

Hi,
I am using DATAEXPORT to export data to SQL tables but its giving error:
MY TABLE:
USE SBC;
Create table TEST
     Period nchar(20),
     HSP_Rates nchar(20),
     Years nchar(10),
     Currency nchar(5),
     Scenario nchar(20),
     ICP nchar(20),
     [Co.] nchar(20),
     Version nchar(20),
     Product nchar(20),
     Entity nchar(30),
Account nchar(50),
     Data numeric(18, 5)
Created this order based on export taken on file
**My Script:**
SET DATAEXPORTOPTIONS
     DataExportLevel "ALL";
     DATAEXPORTCOLFORMAT ON;
     DataExportOverwriteFile ON;
     DataExportDecimal 4;
DATAEXPORTCOND ("HSP_InputValue" <> #MISSING And "HSP_InputValue" <> 0);
FIX (@REMOVE(@RELATIVE ("Balance_Sheet",0),"CY_Earnings"),"Per7","HSP_InputValue","FY12","Local","MY12 Budget", @RELATIVE ("ICP Top",0),@RELATIVE ("Co Total",0),Working,@RELATIVE (PODS,0),@RELATIVE ("Entity",0));
/*DATAEXPORT "File" "," "D:\Test.txt"*/
DATAEXPORT "DSN" "TEST" "Test" "admin" "XXXXXX";
ENDFIX;
Output when exported to File:
"Per7"
"HSP_InputValue","FY12","Local","MY12 Budget","No IC","Co 100","Working","ALLEZ","100-1050","Subs_Cash",500000.046
"HSP_InputValue","FY12","Local","MY12 Budget","No IC","Co 100","Working","AirFreight","100-1050","Subs_Cash",534324.370
ERROR IN LOGS:
[Fri Feb 03 01:10:20 2012]Local/SBC///15796/Info(1013210)
User [admin@Native Directory] set active on database [SBC]
[Fri Feb 03 01:10:20 2012]Local/SBC/SBC/admin@Native Directory/2208/Info(1013091)
Received Command [Calculate] from user [admin@Native Directory]
[Fri Feb 03 01:10:20 2012]Local/SBC/SBC/admin@Native Directory/2208/Info(1013167)
Received Command [Calculate] from user [admin@Native Directory] using [Test.csc]
[Fri Feb 03 01:10:20 2012]Local/SBC/SBC/admin@Native Directory/2208/Info(1021004)
Connection String is generated
[Fri Feb 03 01:10:20 2012]Local/SBC/SBC/admin@Native Directory/2208/Info(1021041)
Connection String is [DSN=SBC;UID=...;PWD=...;]
[Fri Feb 03 01:10:20 2012]Local/SBC/SBC/admin@Native Directory/2208/Info(1021000)
Connection With SQL Database Server is Established
[Fri Feb 03 01:10:20 2012]Local/SBC/SBC/admin@Native Directory/2208/Info(1021013)
ODBC Layer Error: [21S01] ==> [[Microsoft][ODBC SQL Server Driver][SQL Server]Column name or number of supplied values does not match table definition.]
[Fri Feb 03 01:10:20 2012]Local/SBC/SBC/admin@Native Directory/2208/Info(1021014)
ODBC Layer Error: Native Error code [213]
[Fri Feb 03 01:10:20 2012]Local/SBC/SBC/admin@Native Directory/2208/Error(1012085)
Unable to export data to SQL table [Test]. Check the Essbase server log and the system console to determine the cause of the problem.
[Fri Feb 03 01:10:20 2012]Local/SBC/SBC/admin@Native Directory/2208/Info(1021002)
SQL Connection is Freed
[Fri Feb 03 01:10:20 2012]Local/SBC/SBC/admin@Native Directory/2208/Warning(1080014)
Transaction [ 0xb0006( 0x4f2b885c.0xd4e40 ) ] aborted due to status [1012085].
[Fri Feb 03 01:10:20 2012]Local/SBC/SBC/admin@Native Directory/2208/Info(1012579)
Total Calc Elapsed Time for [Test.csc] : [0.022] seconds
I have tried using SQL Drivers for ODBC connection as well as Wire protocol driver.
Please assist asap.
Regards,
Vinit

Chawla,
Fixed in 9.3.3, Check out this, their are few more bugs fixed related to DataExport.
http://docs.oracle.com/cd/E10530_01/doc/epm.931/esb_93300_readme.pdf
8404516 Calculator.The DATAEXPORTCOND calculation command clashes with the FIX
command.
8913164 Calculator. Data exports that use DATAEXPORTCOND do not always export all
the data expected because not all conditions are taken into account within the
DATAEXPORTCOND statement
8988310 Calculator. When exporting data using the DATAEXPORT command from a
duplicate outline that contains a shared hierarchy, the exported data contains the
shared member, not the prototype Etc..
Cheers...!!
Rahul S.

DATAEXPORT - set Dynamic File name in Calc Script

Hi,
I have a calc script which exports data from BSO cube to a flat file. Currently I have hard coded file name within the calc script which is
DATAEXPORT "File" "," "D:/in/CAPXPT_FERC_*FY12*.txt";
and, for example, I want use the substition varaible to dynamically assign the file name let' say
DATAEXPORT "File" "," "/u11/oracle/OHDDEVD/in/CAPXPT_FERC *" + &fYear + "*.txt";
Is there any way to set the export file name dynamically?
Thanks for your help
Regards,

A kind of intriguing thought would be to use the sub var as a way to drive the file name, then grab Robb Salzmann's CDF to dynamically set sub vars on the fly, and then use a RTP to grab that string. I have no idea if this would all tie together, but it would be interesting to try.
Here's Robb's post: http://codingwithhyperion.blogspot.com/2011/08/create-and-update-substitution.html This is my second in a row post that refers to his CDF -- it is almost like that's my pseudonym except of course I'm too thick to write a CDF.
Regards,
Cameron Lackpour
Edited by: CL on Sep 20, 2011 10:36 AM
Spelling. Arrgh.

JEXPORT is not working for me

Hi , Can somebody please help me for JEXPORT.
I copied the JAR file and the properties file. And registered the CDF.
Now i can see the function name @JEXPORT in User defined functions in Calc script. I wrote a simple script.
I am getting this error, *Error: 1200324 Error compiling formula for [Gross Sales.] (line 5): operator expected after [@JExportTo]*
/*ESS_LOCALE English_UnitedStates.Latin1@Binary*/
FIX (FY09,Actual)
"Gross Sales."(
@JExportTo ("File" "," "EA-SALES-EXPORT-OCT21.txt",",","",
@LIST (
@Name (@CURRMBR (Account)),
@Name (@CURRMBR (Pack)),
@Name (@CURRMBR (Period)),
@Name (@CURRMBR (Currency)),
@Name (@CURRMBR (Entity)),
@Name (@CURRMBR (Legal Entity)),
@Name (@CURRMBR (Version)),
@Name (@CURRMBR (HSP_Rates)))
@LIST("Actual"));
ENDFIX;
And if i don't put the member name before @JEXPORT, i will get the *Error: 1012000 Invalid Syntax - Not a CALC command [@JExportTo]*
Edited by: MAHESH ALAPATI on Oct 22, 2009 9:30 AM

You could just trying the sample script on sample.basic database, if it verifies then it points to an issue with your script if it doesn't then it is down to the registration of the cdf.
/* Fix on Actual so that only one scenario is evaluated, otherwise a record for each scenario will be written and duplicated in the export */
Fix ("actual")
"sales" (
          * Export to a text file
          * arg 1: specify "file" to export to a text file
          * arg 2: file name. This file name must be used to close the file after the calculation completes
          * arg 3: delimiter. Accepts "tab" for tab delimited
          * arg 4: leave blank when exporting to text files
          * arg 5: an array of member names
          * arg 6: an array of data
          @JExportTo("file","c:/flat.txt",",","",@List(@NAME(@currmbr(Market)),@NAME(@currmbr(Product)),@NAME(@currmbr(measures)),@NAME(@currmbr(year))), @LIST(actual,budget,Variance) ) ;
EndFix;
*     Clean up
/*Close the file*/
RUNJAVA com.hyperion.essbase.cdf.export.CloseTarget "file" "c:/flat.txt" ;
Cheers
John
http://john-goodwin.blogspot.com/

Using DataExport to create an out put

Iam currently trying to export the level 0 data to a text file( or table) so I can remap the data to a different member
I want a spcific format so it's easy to dump the data to a SQl table.
Currently when I run the following calcscript I get the results as shown below, WIth m1 showing in the first line( it's a dense dimension.
What I want is M1 showing on each row..how can i do that?
Thanks,
SET DATAEXPORTOPTIONS
DataExportLevel "LEVEL0";
DATAEXPORTOVERWRITEFILE ON;
DataExportColFormat OFF;
DataExportDimHeader ON;
DataExportColFormat ON;
FIX("FY2011","Budget","Version1",Amount,FixedAssets,DirectBU,"USD","3011",@LEVMBRS("CostCenters",0),"M1");
DATAEXPORT "File" "," "BEAM";
/*DATAEXPORT "DSN" "bfp" "ClaritydataCS.dbo.BEAM_Output_Budget" "bfpcssql" "pBaUsDsGwEoTrd123";*/
ENDFIX;
Result
"M1"
"VERSION1","FixedAssets","Budget","USD","3011","622185","BU_None","Amount","FY2011",274861.942
"VERSION1","FixedAssets","Budget","USD","3011","652222","BU_None","Amount","FY2011",282.48
"VERSION1","FixedAssets","Budget","USD","3011","652293","BU_None","Amount","FY2011",18052.12
"VERSION1","FixedAssets","Budget","USD","3011","652210","BU_None","Amount","FY2011",102970.24
"VERSION1","FixedAssets","Budget","USD","3011","652801","BU_None","Amount","FY2011",305.28
"VERSION1","FixedAssets","Budget","USD","3011","652802","BU_None","Amount","FY2011",23606.68
"VERSION1","FixedAssets","Budget","USD","3011","652803","BU_None","Amount","FY2011",375305.51
"VERSION1","FixedAssets","Budget","USD","3011","652804","BU_None","Amount","FY2011",4249.49
"VERSION1","FixedAssets","Budget","USD","3011","652430","BU_None","Amount","FY2011",53.81
"VERSION1","FixedAssets","Budget","USD","3011","653220","BU_None","Amount","FY2011",27532.52
"VERSION1","FixedAssets","Budget","USD","3011","653225","BU_None","Amount","FY2011",147806.52
"VERSION1","FixedAssets","Budget","USD","3011","652610","BU_None","Amount","FY2011",331.48
"VERSION1","FixedAssets","Budget","USD","3011","652614","BU_None","Amount","FY2011",204.28
"VERSION1","FixedAssets","Budget","USD","3011","653283","BU_None","Amount","FY2011",969.53
"VERSION1","FixedAssets","Budget","USD","3011","653249","BU_None","Amount","FY2011",27.36

Yes you can export multiple dense dimension columns. In your case I believe the fix statement is limiting what you are exporting. You don't mention what version you are on, but if you reald my blog http://glennschwartzbergs-essbase-blog.blogspot.com/, you will see there could be issues when the data is missing. There is a 4 part series on data export.
I have found that it is best to first export to a flat file and verify that the data is good and what the actual columns are then try to go to a relational source. It took me a little tweaking the first time I did it. I made all of my columns excelt the data columns as Varchar (varchar2 for Oracle)

JExport vs DATAEXPORT

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