Ni 5122: Use of functions that manipulate attributes in NISCOPE
HI, all
I would like to first thank Alan L for responding to my last message. It was helpful.
I am currently using ni 5122 in sampling data sets and EACH set consists of 400 triggered records
and each record contains 1024 points (So this 1024 X 400 matrix will constitute a single image).
The sampling rate is 33 Mhz(There is a reason for choosing this sampling frequency, plz do not
suggest me to increase the sampling frequency as a solution).
Since the trigger occurs at 10 KHz, it will take 40 milliseconds to acquire
a data set which corresponds to a single frame of image.
I am trying to configure my program ( I am using VC++) such a way that I fetch the data
from on-board memory of digitizer to main memory of host computer and perform DSP
on each triggered record while sampling rather than waiting for the entire data set (1024 X 400) to be collected.
The frequency of the trigger signal is 10 kHz, meaning that I have 100 usec for each triggered
record. Since I am using approximately 31 usec to sample the data, I have about 69 usec of idling
period bewteen each triggered record. So, I have attempted to utilize those idling period.
I have looked at "Acquiring data continuously" section of "High Speed Digitizer Help" manual.
From there, I found out that I can fetch triggered records while sampling is still going on.
The manual suggests me to play with the following attributes.
NISCOPE_ATTR_FETCH_RECORD_NUMBER
NISCOPE_ATTR_FETCH_NUM_RECORDS
with the family of
niScope_SetAttributeXXX and niScope_GetAttributeXXX functions.
I have attempted to change value of those attributes but
got the following error.
"The channel or repeated capability name is not allowed." This error also occured
when I attempted to just READ! (The functions I mentioned above appear immediately
before niScope_InitiateAcquisition function in my prog.)
I have also looked at the accompanying c example codes to remedy this,
but found a strange thing in the code. Within the example which uses
niScope_SetAttributeViInt32, the parameter channelList is set to VI_NULL
instead of "0", "1" or "0,1". Why?
As I mentioned earlier, I can get a single frame of image every 40 millisec
( 25 frame/sec), if everything works as I planned. Without fetching portion of
codes, my program currently generates about 20 frame/sec but when I include
the fetching codes, the frame rate decreases to 8 frame/sec.
If anybody has a better idea of reducing fetching time than the one I am using,
please help me.
Godspeed
joon
I would like to thank you (Brooks W.) for the reply.
I think I have stated that " 'my program' generates 20 fps if fetching portion of code is omitted." As I have mentioned earlier I am developing own app. S/W using VC++.
I am already using niScope_FetchBinary16 which you have suggested in your reply.
Here is a full disclosure of issues I am experiencing when fetching triggered records from 5122. I initially wrote a simple code which runs in int main() function and profiled the time used to fetch data using niScope_FetchBinary16. The rate was 23.885714 million samples/sec. However, when I integrated the exact same piece of code to my Win32 app., the rate has gone down to 8.714891 million samples/sec. My PCI link is running at 33 Mhz so the PCI clearly has nothing to do with this problem
I have been looking through NI Discussion forum to find an answer for this and found a person (look at jim_monte's thread "Improving NI-SCOPE performance ") who is experiencing a similar kind of problem. He noticed while executing his program that what appears to be unnecessary DLLs are being loaded.
Is my problem caused by something that jim_monte suggests or do you have any other explanation to my issue?
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SOLVED: How can I use or call a function that returns %ROWTYPE?
Hi
edit: you can probably skip all this guff and go straight to the bottom...In the end this is probably just a question of how to use a function that returns a %rowtype. Thanks.
Currently reading Feuerstein's tome, 5th ed. I've downloaded and run the file genaa.sp, which is a code generator. Specifically, you feed it a table name and it generates code (package header and package body) that will create a cache of the specified table's contents.
So, I ran:
HR@XE> @"C:\Documents and Settings\Jason\My Documents\Work\SQL\OPP5.WEB.CODE\OPP5.WEB.CODE\genaa.sp"
749 /
Procedure created.
HR@XE> exec genaa('EMPLOYEES');which generated a nice bunch of code, viz:
create or replace package EMPLOYEES_cache is
function onerow ( EMPLOYEE_ID_in IN HR.EMPLOYEES.EMPLOYEE_ID%TYPE) return HR.EMPLOYEES%ROWTYPE;
function onerow_by_EMP_EMAIL_UK (EMAIL_in IN HR.EMPLOYEES.EMAIL%TYPE) return HR.EMPLOYEES%ROWTYPE;
procedure test;
end EMPLOYEES_cache;
create or replace package body EMPLOYEES_cache is
TYPE EMPLOYEES_aat IS TABLE OF HR.EMPLOYEES%ROWTYPE INDEX BY PLS_INTEGER;
EMP_EMP_ID_PK_aa EMPLOYEES_aat;
TYPE EMP_EMAIL_UK_aat IS TABLE OF HR.EMPLOYEES.EMPLOYEE_ID%TYPE INDEX BY HR.EMPLOYEES.EMAIL%TYPE;
EMP_EMAIL_UK_aa EMP_EMAIL_UK_aat;
function onerow ( EMPLOYEE_ID_in IN HR.EMPLOYEES.EMPLOYEE_ID%TYPE)
return HR.EMPLOYEES%ROWTYPE is
begin
return EMP_EMP_ID_PK_aa (EMPLOYEE_ID_in);
end;
function onerow_by_EMP_EMAIL_UK (EMAIL_in IN HR.EMPLOYEES.EMAIL%TYPE)
return HR.EMPLOYEES%ROWTYPE is
begin
return EMP_EMP_ID_PK_aa (EMP_EMAIL_UK_aa (EMAIL_in));
end;
procedure load_arrays is
begin
FOR rec IN (SELECT * FROM HR.EMPLOYEES)
LOOP
EMP_EMP_ID_PK_aa(rec.EMPLOYEE_ID) := rec;
EMP_EMAIL_UK_aa(rec.EMAIL) := rec.EMPLOYEE_ID;
end loop;
END load_arrays;
procedure test is
pky_rec HR.EMPLOYEES%ROWTYPE;
EMP_EMAIL_UK_aa_rec HR.EMPLOYEES%ROWTYPE;
begin
for rec in (select * from HR.EMPLOYEES) loop
pky_rec := onerow (rec.EMPLOYEE_ID);
EMP_EMAIL_UK_aa_rec := onerow_by_EMP_EMAIL_UK (rec.EMAIL);
if rec.EMPLOYEE_ID = EMP_EMAIL_UK_aa_rec.EMPLOYEE_ID then
dbms_output.put_line ('EMP_EMAIL_UK lookup OK');
else
dbms_output.put_line ('EMP_EMAIL_UK lookup NOT OK');
end if;
end loop;
end test;
BEGIN
load_arrays;
end EMPLOYEES_cache;
/which I have run successfully:
HR@XE> @"C:\Documents and Settings\Jason\My Documents\Work\SQL\EMPLOYEES_CACHE.sql"
Package created.
Package body created.I am now trying to use the functionality within the package.
I have figured out that the section
BEGIN
load_arrays;
end EMPLOYEES_cache;
/is the initialization section, and my understanding is that this is supposed to run when any of the package variables or functions are referenced. Is that correct?
With that in mind, I'm trying to call the onerow() function, but it's not working:
HR@XE> select onerow(100) from dual;
select onerow(100) from dual
ERROR at line 1:
ORA-00904: "ONEROW": invalid identifier
HR@XE> select employees_cache.onerow(100) from dual;
select employees_cache.onerow(100) from dual
ERROR at line 1:
ORA-06553: PLS-801: internal error [55018]
HR@XE> select table(employees_cache.onerow(100)) from dual;
select table(employees_cache.onerow(100)) from dual
ERROR at line 1:
ORA-00936: missing expressionHe provides the code genaa.sp, and a very brief description of what it does, but doesn't tell us how to run the generated code!
Now, I have just done some googling, and it seems that what I am trying to do isn't possible. Apparently %ROWTYPE is PL/SQL, and not understood by SQL, so you can't call onerow() from sql. Correct?
So I try wrapping the call in an exec:
HR@XE> exec select employees_cache.onerow(100) from dual;
BEGIN select employees_cache.onerow(100) from dual; END;
ERROR at line 1:
ORA-06550: line 1, column 30:
PLS-00382: expression is of wrong type
ORA-06550: line 1, column 7:
PLS-00428: an INTO clause is expected in this SELECT statement
HR@XE> exec select table(employees_cache.onerow(100)) from dual;
BEGIN select table(employees_cache.onerow(100)) from dual; END;
ERROR at line 1:
ORA-06550: line 1, column 14:
PL/SQL: ORA-00936: missing expression
ORA-06550: line 1, column 7:
PL/SQL: SQL Statement ignored
HR@XE> exec employees_cache.onerow(100)
BEGIN employees_cache.onerow(100); END;
ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00221: 'ONEROW' is not a procedure or is undefined
ORA-06550: line 1, column 7:
PL/SQL: Statement ignoredNo joy.
Of course, now that I'm looking at it again, it seems that the way to go is indicated by the first error:
PLS-00428: an INTO clause is expected in this SELECT statement
So am I supposed to create a type of EMPLOYEES%ROWTYPE in a PL/SQL procedure, and the idea of this code, is that the first call to onerow() runs the initialiation code, which populates the cache, and all subsequent calls to onerow() (whether by my session or any other) will use the cache?
I've had a stab at this, but still, no joy:
create or replace procedure testcache is
emp employees%rowtype;
begin
select employees_cache.onerow(100) from dual into emp;
dbms_output.put_line('Emp id: ' || emp.employee_id);
end testcache;
show errors
HR@XE> @testcache.sql
Warning: Procedure created with compilation errors.
Errors for PROCEDURE TESTCACHE:
LINE/COL ERROR
4/9 PL/SQL: SQL Statement ignored
4/54 PL/SQL: ORA-00933: SQL command not properly ended
HR@XE>Have a feeling this should be really easy. Can anybody help?
Many thanks in advance.
Jason
Edited by: 942375 on 08-Feb-2013 11:45>
Ha, figured it out
>
Hopefully you also figured out that the example is just that: a technical example of how to use certain Oracle functionality. Unfortunately it is also an example of what you should NOT do in an actual application.
That code isn't scaleable, uses expensive PGA memory, has no limit on the amount of memory that might be used and, contrary to your belief will result in EVERY SESSION HAVING ITS OWN CACHE of exactly the same data if the session even touches that package.
Mr. Feuerstein is an expert in SQL and PL/SQL and his books cover virtually all of the functionality available. He also does an excellent job of providing examples to illustrate how that functionality can be combined and used. But the bulk of those examples are intended solely to illustrate the 'technical' aspects of the technology. They do not necessarily reflect best practices and they often do not address performance or other issues that need to be considered when actually using those techniques in a particular application. The examples show WHAT can be done but not necessarily WHEN or even IF a given technique should be used.
It is up to the reader to learn the advantages and disadvantages of each technicalogical piece and determine when and how to use them.
>
Now, I have just done some googling, and it seems that what I am trying to do isn't possible. Apparently %ROWTYPE is PL/SQL, and not understood by SQL, so you can't call onerow() from sql. Correct?
>
That is correct. To be used by SQL you would need to create SQL types using the CREATE TYPE syntax. Currently that syntax does not support anything similar to %ROWTYPE.
>
So am I supposed to create a type of EMPLOYEES%ROWTYPE in a PL/SQL procedure, and the idea of this code, is that the first call to onerow() runs the initialiation code, which populates the cache, and all subsequent calls to onerow() (whether by my session or any other) will use the cache?
>
NO! That is a common misconception. Each session has its own set of package variables. Any session that touches that package will cause the entire EMPLOYEES table to be queried and stored in a new associative array specifically for that session.
That duplicates the cache for each session using the package. So while there might be some marginal benefit for a single session to cache data like that the benefit usually disappears if multiple sessions are involved.
The main use case that I am aware of where such caching has benefit is during ETL processing of staged data when the processing of each record is too complex to be done in SQL and the records need to be BULK loaded and the data manipulated in a loop. Then using an associative array as a lookup table to quickly get a small amount of data can be effective. And if the ETL procedure is being processed in parallel (meaning different sessions) then for a small lookup array the additional memory use is tolerable.
Mitigating against that is the fact that:
1. Such frequently used data that you might store in the array is likely to be cached by Oracle in the buffer cache anyway
2. Newer versions of Oracle now have more than one cache
3. The SQL query needed to get the data from the table will use a bind variable that eliminates repeated hard parsing.
4. The cursor and the buffer caches ARE SHARED by multiple sessions globally.
So the short story is that there would rarely be a use case where ARRAYs like that would be preferred over accessing the data from the table. -
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Dear all;
I have the following sample date below
create table temp_one
id number(30),
placeid varchar2(400),
issuedate date,
person varchar2(400),
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primary key(id)
insert into temp_one values (1, 'NY', to_date('03/04/2011', 'MM/DD/YYYY'), 'John', 3);
insert into temp_one values (2, 'NY', to_date('03/03/2011', 'MM/DD/YYYY'), 'Adam', 7);
insert into temp_one values (3, 'Mexico', to_date('03/04/2011', 'MM/DD/YYYY'), 'Wendy', 3);
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This gets the output you posted from the sample data you posted:
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, TO_CHAR ( TRUNC (issuedate, 'IW')
, 'MM/DD/YYYY'
) || ' - '|| TO_CHAR ( TRUNC (issuedate, 'IW') + 6
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Latest update of Firefox is REALLY slow. Is it just all the extra functionality that has been added or is there a button I need to press to make it the same speed as it use to be? I'll have to start usin safari again as this isn't funny anymore
Can i retro grade back to the last version?uninstalled firefox ....deleted all files still remaining under mozilla firefox directory in program files ... to avoid having to reprogram all my settings, reisntall all addons as well .. I did not remove anything from mozilla firefox that is stored in either appdata or under the windows users directory (if any)
... the as suggested reinstalled the latest version of the firefox browser using the link you provided in the email ..; tested and several issues still remain present and unresolved ....
so please this is urgent or I will have to jump browsers and start using chrome .. because we work 14 hours a day 6 (sometimes 7) days a week, to get ready for the launch of our newest venture and we cannot lose that much days on browser related issues ... so please instead of putting me through week long step process .. of do this .. do that .. can you please actually look into the issue from your end .. I use firefox for so many, many years thta I deserve this kind of support .. thnx Robert -
Hi, Does anyone know when Apple may be introducing a smaller more managable IPhone so we dont have to carry a brick around with us anymore. Even if this means less functions that, lets be honest, we dont all use at all. Many thanks
jamesfromjersey ci wrote:
Hi, Does anyone know when Apple may be introducing a smaller more managable IPhone so we dont have to carry a brick around with us anymore. Even if this means less functions that, lets be honest, we dont all use at all. Many thanks
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