Reducing call to a function
Hello,
I have to do some lookup for some fields (let's acll one of them A) in a table (Z). in order to avoid calling the function for all lines, I was thinking of grouping the lines based on the field A, and then, calling the function to do the lookup only based on the distinct values of A instead of doing it for all lines. This can also be done with a table function with the same idea.
My problem is that using this method, I don't know how to reverse the process: i.e. how do I associate the result of the lookup with all the records of Z to carry on my process ?
Thanks in advance
Hi,
Is this what you want?
WITH just_a AS
SELECT DISTINCT a
FROM z
, a_and_func AS
SELECT a
, my_func (a)
FROM just_a
SELECT whatever
FROM z
JOIN a_and_func af ON z.a = af.a
WHERE ...Like Peter said, declare the function as DETERMINISTIC.
The query above may or may not help you once you've done that.
Similar Messages
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Calling a library function node much faster than labview code?
Hi, I wrote a labview routine to perform a multiple tau autocorrelation on a large array of integers. A multi tau autocorrelation is a way to reduce the computation time of the correlation but at the expense of resolution. You can taylor the multitau correlation to give you good resolution where you need it. For instance, I require good resolution near the middle (the peak) of the correlation, so I do a linear autocorrelation for the first 64 channels from the peak, then I skip every second channel for the next 32, then skip every 4th channel for 32 more, then skip every 8th for 32 channels... etc.
Originally, I wrote my own multitau calculation, but it took several hours to perform for just 1024 channels of the correlation of around 2million points of data. I need to actually do the the correlation on probably 2 billion or more points of data, which would take days. So then I tried using labview's AutoCorrelation.vi which calls a library function. It could do a linear autocorrelation with 4 million points in less than a minute. I figured that writing my code in C and calling it using a call library function node would be faster, but that much faster?
Finally, I wrote some code that extracts the correlation data points that I would've got from my multitau code from the linear correlation function that I get from the AutoCorrelation.vi. Clearly this is not optimal, since I spend time calculating all those channels of the correlation function just to throw them away in the end, but I need to do this because the final step of my procedure is to fit the correlation function to a theoretical one. With say 2million points, the fit would take too long. The interesting thing here is that simply extracting the 1024 point from the linear autocorrelation function takes a significant amount of time. Is labview really that slow?
So, my questions are... if I rewrite my multitau autocorrelation function in C and call it using a call library function node, will it run that much faster? Can I achieve the same efficiency if I use a formula node structure? Why does it take so long just to extract 1024 points from an array?
I've tried hiding indicators and this speeds things up a little bit, but not very much.
I'll attach my code if you're interested in taking a look. There is a switch on the front panel called 'MultiTau'... if in the off position, the code performs the linear autocorrelation with the AutoCorrelation.vi, if in the on position, it performs a multitau autocorrelation using the code I wrote. Thanks for any help.
Attachments:
MultiTauAutocorrelate.vi 627 KBHi,
The C routine that AutoCorrelation.vi is using is probably a higly optimised routine. If you write a routine in LabVIEW, it should be less then 15% slower. But you'd have to know all ins and outs of LabVIEW. How data is handled, when memory is allocated, etc. Also note that the AutoCorrelation.vi has years of engineering behind it, and probably multiple programmers.
It might even be possible that the c code uses an algorithmic improvement, like the Fast Fourier Transform improves speed on the Fourier Transform. I think the autocorrelation can be done using FFT, but that isn't my thing, so I'm not sure.
For a fair comparation, posting the code in this forum was a good idea. I'm sure together we can get it to 115% or less of the C variant. (15/115 is just a guess, btw)
I'm still using LV7.1 for client compatibility, so I'll look at the code later.
Regards,
Wiebe.
"dakeddie" <[email protected]> wrote in message news:[email protected]...
Hi, I wrote a labview routine to perform a multiple tau autocorrelation on a large array of integers. A multi tau autocorrelation is a way to reduce the computation time of the correlation but at the expense of resolution. You can taylor the multitau correlation to give you good resolution where you need it. For instance, I require good resolution near the middle (the peak) of the correlation, so I do a linear autocorrelation for the first 64 channels from the peak, then I skip every second channel for the next 32, then skip every 4th channel for 32 more, then skip every 8th for 32 channels... etc. Originally, I wrote my own multitau calculation, but it took several hours to perform for just 1024 channels of the correlation of around 2million points of data. I need to actually do the the correlation on probably 2 billion or more points of data, which would take days. So then I tried using labview's AutoCorrelation.vi which calls a library function. It could do a linear autocorrelation with 4 million points in less than a minute. I figured that writing my code in C and calling it using a call library function node would be faster, but that much faster?Finally, I wrote some code that extracts the correlation data points that I would've got from my multitau code from the linear correlation function that I get from the AutoCorrelation.vi. Clearly this is not optimal, since I spend time calculating all those channels of the correlation function just to throw them away in the end, but I need to do this because the final step of my procedure is to fit the correlation function to a theoretical one. With say 2million points, the fit would take too long. The interesting thing here is that simply extracting the 1024 point from the linear autocorrelation function takes a significant amount of time. Is labview really that slow?So, my questions are... if I rewrite my multitau autocorrelation function in C and call it using a call library function node, will it run that much faster? Can I achieve the same efficiency if I use a formula node structure? Why does it take so long just to extract 1024 points from an array?I've tried hiding indicators and this speeds things up a little bit, but not very much.I'll attach my code if you're interested in taking a look. There is a switch on the front panel called 'MultiTau'... if in the off position, the code performs the linear autocorrelation with the AutoCorrelation.vi, if in the on position, it performs a multitau autocorrelation using the code I wrote. Thanks for any help.
MultiTauAutocorrelate.vi:
http://forums.ni.com/attachments/ni/170/185730/1/MultiTauAutocorrelate.vi -
Calling a package function inside a sql
Hi friends!!!
First of all happy Christmas! And them please help! :)
We have a query calling a package function:
SELECT * FROM DW025H WHERE DW025H_NR=MPPCI.ENCR ('0000000000000000');There is a primary key just with one column DW025H_NR and the problem is that is not accessing by INDEX UNIQUE SCAN,
it's accessing by TABLE ACCESS FULL.
May be the problem is that we are calling a procedure inside the query?
I have been able to run that query accessing by primary key from my computer but a workmate hasn't!
We both are connecting the same data base 10.2.0.4 and using Oracle SQL Developer!
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 5343K| 1406M| 15670 (7)| 00:02:43 |
|* 1 | VIEW | DW025H | 5343K| 1406M| 15670 (7)| 00:02:43 |
|* 2 | FILTER | | | | | |
| 3 | TABLE ACCESS FULL| DW025H | 5343K| 1406M| 15670 (7)| 00:02:43 |
Predicate Information (identified by operation id):
1 - filter("DW025H_NR"="MPPCI"."ENCRIPTAPAN"('0000000000000000'))
2 - filter(CASE "OPS$SISINFO"."IS_USER_DNI"() WHEN 1 THEN
SYS_AUDIT('OPS$SISINFO','DW025H','CMINFOGR001',3) ELSE NULL END IS
NULL)
The correct path would be:
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 276 | 3 (0)| 00:00:01 |
|* 1 | FILTER | | | | | |
| 2 | TABLE ACCESS BY INDEX ROWID| DW025H | 1 | 276 | 3 (0)| 00:00:01 |
|* 3 | INDEX UNIQUE SCAN | PK_DW025H | 1 | | 2 (0)| 00:00:01 |
Predicate Information (identified by operation id):
1 - filter(CASE "OPS$SISINFO"."IS_USER_DNI"() WHEN 1 THEN
SYS_AUDIT('OPS$SISINFO','DW025H ','CMINFOGR001',3) ELSE NULL END IS NULL)
3 - access("DW025H_NR"="MPPCI"."ENCR"('0000000000000000'))
Please any ideas!?!?!
Thanks a lot!
José
Edited by: jamv on Dec 20, 2011 10:50 AMHello
Have a read of this and try to pull together the information in it and post it up here. That will help immensely with getting to the root of your problem...
HOW TO: Post a SQL statement tuning request - template posting
In the mean time:
From the execution plan you have extra predicates that aren't present in the query you supplied, so that's either not the SQL or you have something like VPD switched on.
Anyway, there could be lots of reasons for the difference in execution plan. Sorry if this is very basic and possibly patronising question but it's always worth checking the basics I think - are you both definitely connecting to the same database? If so, have a look in v$sqlarea for this SQL statement and find the SQL_ID, use this to query v$sql and look at the child_number column.
select
sql_id
from
v$sqlarea
where
sql_text like '%SELECT * FROM DW025H WHERE DW025H_NR=MPPCI.ENCR%(''0000000000000000'')%'
and
sql_text not like '%v$sqlarea%'
select child_number from v$sql where sql_id='<enter the sql id returned by the query above>'as an example...
XXXX> select /* my sql statement*/ rownum id from dual;
ID
1
1 row selected.
Elapsed: 00:00:00.10
XXXX> select sql_id from v$sqlarea where sql_text like '%my sql statement%'
and sql_text not like '%v$sqlarea%';
SQL_ID
a6ss4v79udz6g
1 row selected.
Elapsed: 00:00:03.56
XXXX> select child_number from v$sql where sql_id='a6ss4v79udz6g'
2 /
CHILD_NUMBER
0
1 row selected. If you have more than one row in v$sql there could be differences in the optimiser environment. The supplied like shows you how to gather the information that should help find what the differences are if any.
Also as a side note if you're calling PL/SQL functions from SQL, you can take advantage of subquery caching to help reduce the number of calls (depending on your version). As it stands, your function is most likely going to be called for every row - when there is only a single row returned, that's not necessarily a problem but for multiple rows, the overhead can quickly grow. If there's no way to get rid of the function call, select the function from dual instead i.e.
SELECT * FROM DW025H WHERE DW025H_NR= (SELECT MPPCI.ENCR%('0000000000000000') FROM dual);This also (as I learnt a couple of weeks ago) works when you're using columns in the table your selecting from as parameters to the function.
HTH
David -
Matscript node void ouputs when calling user-defined functions
Hi,
I have a (for most of you, probably simple) problem with calling user defined function within a mathscript node.
I have a script inside a MathScript node which calls three UD functions. When I try to output variables, LabView sets their type to void, so I cannot use them further. this would imply, that the script is nondeterministic, (since the types would get set at runtime). However, if I replace the call to the UD function with the actual contents of the function, the variable becomes deterministic. Now, since I have several call to these functions, I have no desire in writing all of them many time, introducing many variables etc. What would you advise me to do?
Find attached my scripts and functions.
I need this script running on a RT Target, and have been battling this for weeks, with almost no success!
Thanks, Regards,
Luka
Attachments:
Scripts.zip 2 KBMArtin, hello!
As far as I know, LabView checks the syntax as you write in the MS Node, and since there is no X mark next to the line number, it indicates, that the syntax is correct. Since i have set the path to the UDF in both the VI options and in the general MAthScript setting, how does adding the path command help? even if I add path('directory') command, a yellow exclamation mark appears, saying the command is slowing down performance.
(this is the original help explanation:
The warning glyph indicates that LabVIEW operates with reduced error checking at edit time and slower run-time performance for the MathScript Node. The following conditions cause the warning glyph to appear. To remove the warning glyph from the MathScript Node and improve run-time performance, modify your script as follows to resolve the condition in your script:
Your script calls addpath or pathremove (legacy name rmpath), or calls cd, path, or userpath with one or more inputs, which change the MathScript search path list at run time. Remove these functions and use the MathScript page to configure the default search path)
Could you please post a screenshot of your VI, just to see, if you've got anything different set up?
I am running LV2012.
Luka -
Call a java function on retrieval
Hi,
Is it possible to call a java function on retrieval from a member formula or may be business rule. Will it be more efficient than the member formula itself ? Currently our member formula on dynamic member is timing out.
It'll be nice if you could point me towards some material to read on and experiment.
Any pointers will be helpful.
Thanks.>> if I'm wrong but this CRC will work only if my data is in database tables
Data dynamically retrieved from Essbase VIA APS with using MDX queries
>>dynamic calc member is retrieving and calculation data from the planning cube itself.
No . It ONLY for stored member.
I need reduce using DCALC
>> Do you have any more detailed info on how to deploy this and how to call this in member formula or calc script
Just now i don have any detailed document for this. But
1) You need to know about Essbase Load Rules, Maxl Load Data, MDX data retirvies.
2) You need advanced PL-SQL experience for using it -
How to call a C function calling a Java Method from another C function ?
Hi everyone,
I'm just starting to learn JNI and my problem is that I don't know if it is possible to call a C function calling a Java Method (or doing anything else with JNI) from another C function.
In fact, after receiving datas in a socket made by a C function, I would like to create a class instance (and I don't know how to do it too ; ) ) and init this instance with the strings I received in the socket.
Is all that possible ?
Thank you very much for your help !Hard to understand the question, but by most interpretations the answer is going to be yes.
You do of course understand that JNI is the "API" that sits between Java and C and that every call between the two must go through that. You can't call it directly. -
How to call a SQL function from an XSL expression
Hi
In R12, in Payroll Deposit adivce/Check writer, We need to sort the earnings tag <AC_Earnings> in to two different categories as regular and other earnings. In the DB and form level of element defintiion we have a DFF which differentiates between the two kinds of earnings. But the seeded XML that is gerneated by the check writer does not have this field.
The seeded template displays all the earnings in one column. How can we achieve this in the template without modifying the seeded XML.
The one approach i have is to write a function and based on the return value sort the data. For this I need to know :
1) How to call a SQL function from an XSL expression that is allowed in BI template.
If anyone ahs faced similar requirements please share your approach.
Thanks
SrimathiThank u..
but i'd seen that link wen i searched in google..
Is it possible without using any 3rd party JARs and all?
and more importantly plz tell me what should be preferred way to call a javascript function?
Do it using addLoadEvent() or Windows.Load etc
OR
Call it thru Xsl? (I donno how to do dis)
Thanks in Advance..
Edited by: ranjjose on Jun 3, 2008 8:21 AM -
Problem while calling an RFC Function Module in Background
Hello,
I have created a RFC function module for reading data from an external DB system. The FM calls an external RFC program (coded in C++ using RFC SDK), which delivers the required data. This external program is maintainged as an TCP RFC Connection in SM59.
Further I have created a report, that calls the RFC function module to get the data from the external RFC programm.
My problem is, when I call the report in foreground, everything works OK, the RFC connection works and data can be read from the external program.
However, when I schedule the report to run in background as a job, the report is stating in the protocoll that there was a problem calling the defined RFC connection (although the connection is working properly at that time).
More funny is, this particular problem with running in background occurs only in the productive system, in test and development system the report works correctly also while running as a job in background.
Can you suggest the solution to this problem? Could it be something with authorisations or server settings?
I will be on holiday for the next 6 weeks, so take your time to answer .
Regards,
Dusan.
Edited by: Julius Bussche on Jan 22, 2009 7:19 PM
Please read the forum rules about u r g e n t ...This is an external RFC server program, not a remote enabled ABAP RFC function module as the others seem to be assuming, right?
Is it possible that your DEV and QAS systems only have one application server, but the PROD has many and dedicated one(s) for processing low priority background jobs?
It might be that the target server of your TCP connection is not this BTC instance, and your RFC server is returning the data "locally" - so, into nirvana...
Just guessing, but might be worth checking.
Cheers,
Julius -
How can I have a backing file call a JavaScript function?
I have a Weblogic portal with a JSP portlet. The portlet has a backing file. How can I get the backing file to call a JavaScript function in my portlet?
thanksHi
your questions are not correct because you are mixing up server side operations with client side operations.
First server side code executes then the page is sent to the browser , then any javascript executes on the browser. So asking for javascript to be called from backing file (server side) doesn't make sense or asking for javascript to read a parameter doesnt exactly work either.
However in your server code suppose you have a variable action in the request that you want javascript to know then in your JSP you would add something like
<script type="text/javascript">
var action = '${requestScope.action}';
alert(action);//or whatever you want to do
<c:if test="${requestScope.someOthervariable == ''xyz'}"><%-- this check is done on the server --%>
callSomeJavascript(); <%--this javascript is only executed when the server side value of someOtherVariable is xyz --%>
</c:if>
</script>
i.e. you can output the javascript that has the variables you need or the function calls you want.
Like I said understand whats server side and whats client side. -
How can I call a plsql function from an attribute?
I have an attribute defined in an element. I want execute a PLSQL function from the attribute, and display the returne value with an HTML template.
I've defined the attribute's type like PLSQL, and I've put the called of the function in the value of the attribute, but it doesn't work. The only value I obtain is an URL (I think that is the URL of the function or someting like this).
How can I call to my function from the attribute and display the returnes value in the page?
Thanks.Thanks, but it doesn't work. I have an attribute called ID_BOL and I want to associate a sequence to that attribute. I've created a function, with the sequence. This function return de value of the sequence. I want taht the attribute takes the value of the sequenece dinamically.
I've tried it, creating the type attribute like PLSQL, and calling the function from the attribute, but it doesn't work.
How can I return the sequence value to my attribute?
Thanks. -
Visual fortran calling a c function in visual studio
Hi,
I am running Windows 8.1 with Visual Studio Prof. 2012. I have installed Visual Fortran also. Now I wanted to make a solution with two projects one for Visual Fortran and one for C, and be able to call a C function from within the Fortran.
Can someone, please, show how to do this step by step? Guide with pictures would be awesome.
Thanks in advance.Hi Engineer101,
One way to integrate your code into TestStand would be to save it as a .dll file. Cick this link for information on how to do this in visual c++ 2008. Once you have the dll, you can call it in teststand using a c/c++ dll action step. I hope this helps, and let me know if you have any further questions!
Al B.
Staff Software Engineer - TestStand
CTA/CLD -
How to call a Javascript function from backing bean without any event
Hi,
Someone knows how to call a Javascript function from backing bean without any event ?
thanksPlease review the following thread:
ADF Faces call javascript
Luis. -
How to call the 'DETAIL' function in ALV for a program?
Dear Friends,
I have a prf_tree (TYPE REF TO cl_gui_alv_tree), and I added below codes to add an new button for displaying the detail record, it works fine:
CALL METHOD prf_toolbar->add_button
EXPORTING
fcode = prf_tree->mc_fc_detail
icon = icon_detail
butn_type = cntb_btype_button
text = ''
quickinfo = 'Show Details'.
Everytime I click this new button, a window will popup and display the record details.
My question is: how to call this standard function ('DETAIL' function) in a program? for example:
CASE ldf_ok_code.
WHEN gcf_okcode_save.
PERFORM okcode_save.
WHEN 'SHOW_DETAIL'.
CHECK gdf_nodkey_9003 IS NOT INITIAL.
PERFORM SHOW_DETAIL.(How to write this code to display the detail data of the selected record?)
Thanks a lot!Hi,
Go for Interactive Reporting
like When u click on the output then it will show the Detail report u want .
for that purpose Pls
Use Hide command .
And call another report
by using SUBMITT Program -
Calling Synchronous RFC Function Module in Background
Hi all,
Currently we are working on some requirement where in we have to retrieve data from one system(CRM) and update the same into another system(ECC). We have developed a RFC Function in CRM system and it is being called from ECC system as in synchronous mode via a batch program.
Now since all sychronous call to a RFC function will be dialog there is a constraint on the runtime which is being set by maximum run time for each dialog work process. So my question is there an option to call an RFC function synchronously in background (background task) so there is no runtime performance.
The standard TRFC, QRFC calls in background runs asynchronously and so I am trying to check with the SDN world as whether has anyone tried SRFC(Synchronous) call in background?
Thanks in advance,
JagathSo my question is there an option to call an RFC function synchronously in background (background task) so there is no runtime performance.
One solution would be to increase the value of the "time out" parameter defined the CRM system. This i feel is not a fool-proof solution as the run-times cannot be predicted. Check this thread: Re: RFC timeout profile parameter
For me a better solution would be to implement tRFC call instead of a synchronous call. Any reasons why you don't want to implement a tRFC ?
BR,
Suhas
Edited by: Suhas Saha on Jun 26, 2010 8:52 AM -
Hello Guys,
I have a question regarding calling a RFC function module.
In BW - BI 7.0 I call a RFC function module:
(The ABAP program in BW-BI 7.0 is below)
CALL FUNCTION ''ZTESTFUNCTIONMODULE' " Function module in ECC
DESTINATION 'DECCLNT110' " ECC system
TABLES
it_gl_item = it_gl
it_errlog_gl = it_errlog_gl.
The 'ZTESTFUNCTIONMODULE' is RFC enabled in the ECC system.
The purpose is we retarct the data from BW to ECC.
When I run the function module it always asks for the user id and password.
The SAP logon screen appears and it asks for the user id and password.
The destination is maintained in the SM59 transaction and also the user is maintained there. I think it should login automatically into remote system and return the tables. is it correct. How to skip the logon screen.
Do I have to pass the user id and password in the function module. I think it should take the user id from the SM59 destination. Is it correct.
Please advise. As always thanks for your help guys.Hi Senthil,
I think you answered your query in your question itself
The user ID and password need to be maintained in RFC destination in SM59.
Go to SM59 and then click on test connection..if it does not ask for ID and passwoed that means correct ID and password is maintained in SM59 otherwise maintain it.
Regards,
Atish
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