Difference between v$instance and v$thread

Hallo,
What is the difference between v$instance and v$thread?
Thanks,

Well, a mere description of the views in the official documentation isn't going to actually help you very much more than you could do with a simple "desc V$instance/desc V$thread", I suspect.
The answer I think you might be looking for is that a thread is not the same thing as an instance. In fact, we usually talk about "a thread of redo", which gets much closer to the issue here. Yes, it is true that one instance can only generate one 'thread of redo', so one instance = one thread, and there's a temptation to extrapolate from that and assume they're the same thing.
But they're not. An instance is a set of memory structures and processes. It has a name. It gets started and stopped. In can be running in various states (nomount, mount, open, read-only, primary, secondary etc).
A thread of redo is a history of redo generated by an instance. It has ever-incrementing checkpoint change numbers, times of last checkpoints, sequence numbers, blocks of redo that are forever being flushed to different parts of the current redo log. And so on.
Thus, V$INSTANCE tells you the state of the instance and V$THREAD tells you all you could ever want to know about where you're up to in the writing-redo stakes.

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Difference Between central instance And application instance

Hi every body can any one tell me that
what is the difference between Central instance and Application instance.
If i am using 4.7 ee with orcale data base.

Check these links
http://oreilly.com/catalog/sapadm/chapter/ch01.html
Basically these terms comes when you are working on live servers where all the users log into to do their daily work.
We says when we want to distribute the workload on servers we requires central instance and application servers.
Normally it is not known to common users where they are logging into...but they can login directly usign the specific Instance details of servers.
Please see this also
http://help.sap.com/saphelp_nw2004s/helpdata/en/c4/3a64e8505211d189550000e829fbbd/frameset.htm

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Hi
I don't know the clear difference between database, instance and schema.. In the broad sense, everything seems to be the same. If anyone can differentiate between them with some example, that will be of great help.
Thank you.

Hi,
In Oracle, people often do use "database" and "instance" interchangeably, or together as one term: "database instance".
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Difference between Central Instance and Application server?

Can anybody let me know the exact difference betwwen a Central Instance and An Application server?

I think it can help you to understand the concepts:
http://help.sap.com/saphelp_40b/helpdata/en/08/5741a84ae611d1894f0000e829fbbd/content.htm
Best regards,
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A Class defines what attributes (properties) and methods a particular item will have.
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public class Person
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String name;
int age;
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HTH,
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In the below code,
List<String> test = new ArrayList<String)();
list.add("one");
list.add("two");
list.add("three");
list.clear();
(or)
list = new ArrayList<String)();
list.add("four");
list.add("five");
What is the difference between List.clear() and creating new instance for list?

1. Use code tags to post codes -- [code]CODE[/code] will display asCODEOr click the CODE button and paste your code between the {code} tags that appear.
2. Invoking clear() sets all the elements of the ArrayList to null and resets the size to 0.    public void clear() {
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ArrayList<String> stringsB = stringsA;
: // add elements to stringsA
: // stringsB refers to the same populated list
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Difference between LockSupport.parkUntil and Thread.sleep method

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Could someone please explain the difference between LockSupport.parkUntil and Thread.sleep methods.
Thanks in advance.

javaLearner wrote:
The thing that I am trying to understand is - the difference / correlation between the two methods mentioned.
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(https://msdn.microsoft.com/en-us/library/system.threading.thread.currentculture(v=vs.110).aspx)

1)
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Rachit
Please mark as answer or vote as helpful if my reply does

Difference between application server and central instance

Hi everyone,
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Regards
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Hi,
just want to clarify that is is not correct that only one enqueue process can be configured on the CI.
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thanks
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A lot of users are asking what are the differences between PSE 30 and PSE 40.
This Thread provides information on this subject. First, you will find information copied from the section "New Features" of the useful "Adobe Photoshop Elements 4.0 User Guide". Then later on, you might find additional information on the same subject provided by users of PSE.
--- Start of copy of information in the PSE 4.0 User Guide ----
1 What's new in PSE 4.0
1.1 Editing and selection
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the object you want to extract; then scribble or place dots on the background, and Photoshop Elements separates the object from its background. This tool is perfect for creating composites or scrapbook images. (See User Guide "To use the Magic Extractor" on page 194.)
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Click an area of skin and watch the tonal balance of all colors in the photo improve. If you
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1.1.4 Red eye removal
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Straighten and crop crooked photos by drawing a horizontal or vertical line in the image. Photoshop
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What you see is what you get -see what each font looks like from within the font menu. (See
User Guide "To choose a font family and style" on page 332.)
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If you have Windows¨ XP Media Center 2005 installed, you can view your Photoshop Elements
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Select a group of photos and let Photoshop Elements isolate and display all the faces so that you can
quickly tag them. The Find Faces dialog box displays thumbnails of each face until you tag it. (See User Guide "To automatically find faces for tagging" on page 101.)
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Search for a variety of metadata criteria, such as file name, file type, shutter speed, camera
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--- Continuation in next Post of this Thread ----

--- Continuation from previous Post -----
2 What's changed in PSE 4.0
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2.1.3 Quick Fix
Use the newly enhanced automatic correction options for the most common photo flaws. (See User Guide "To correct color in Quick Fix" on page 207.)
2.1.4 Easier color management
Easily get the color you expect when printing. N ew options and improved embedded
profile support streamline color management. (See User Guide "About color management" on page 236.)
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Fine tune exposure and lighting by working with the raw data from your digital camera, and
easily export photos to the universal DNG format. (See User Guide "About camera raw image files" on page 159.)
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Quickly remove noise caused by shooting in low light or with ISO camera settings by using the
new Remove JPEG Artifacts option in the Noise filter. (See User Guide "Reduce Noise" on page 289.)
2.2 Sharing and printing
2.2.1 Multimedia slide shows
Create feature-rich slide shows with all the new tools and options available in the Slide Show
Editor:
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2.3.1 Faster download
Use the enhanced Photo Downloader to quickly download photos from your digital camera and
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View your photos in full screen without the clutter of command menus and tools.
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--- End of Information Copied from the Adobe PSE 4.0 User Guide

Whats the actual difference between Business system and Business service

whats the actual difference between Business system and Business service

Business System
1) Business system is a logical system, and there is an importance on physical existence of the system.
2) Also SLD entry is required.
3)It is generally used for SAP applications, this is just a general prinicple followed but not mandatory.
4)This is defined as part of the SLD and is a physical system whose parameters are well defined.
5(Business systems refers to the physical systems, for instance the R/3 system. You define the business systems in the SLD
Business Service
1) You use a Business Service, when you do not have the System details of the the partner system to which you want to communicate. i.e. you have not configured the partner system in SLD.
2) Business Service is an Absract Unit with Sender and Receiver Interfaces,In this case you need to explicitly add the message interfaces while doing configuration in ID.
3) It is generally used for NON-SAP applications, this is just a general prinicple followed but not mandatory.
4) This is not defined as part of SLD and whose technical parameters are not completely known.
5)Business service is used when the message is not addressed to a business system. It is used mostly in B2B scenarios.
Also go through these links and threads...
http://help.sap.com/saphelp_nw2004s/helpdata/en/c7/301640033ae569e10000000a155106/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/14/80243b4a66ae0ce10000000a11402f/frameset.htm
Business service or Business system??
Business Service vs Business System in Integration Directory.
Best Regards

Difference between Planning Version and Simulation Version

Hi friends,
What is the difference between Planning Version and Simulation Version?
Thanks,
Debi

Debi
There are a lot of threads in this forum that give detailed info about version concept. Also you can refer to help.sap.
Anyways , planning version is the version against which your live cache data is stored. The data against this version is the one that the planners and buyers are going to refer to or use to make their planning and buying decisions. Data against the planning version is nothing but data relevant to the business .
There may be instances where you would like to simulate some scenario. If you want to do trial and error analysis and at the same time if you do not want to impact the actual business data , then you create simulation versions and simulate your scenario.
For example your actual sales orders received for the month of March may be 100 CS. This is the actual number that will be stored against your planning version. Lets say the demand planner wants to find out what will be the impact if there is a sudden bulk demand from a new customer for 500 CS - that is if he wants to do a what - if analysis then he can create a simulation version and try to check the impact .
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Aparna

Difference between abap object and function

hi all,
i read the book on abap object of the difference between abap object and classical abap.
i know that there is only 1 instance of a specific function group but somehow i still not so clear why subsequent vehicle cannot use the same function. i also can use the do and loop to call the function? if cannot then why?
hope can get the advice.
thanks
using function *********
function-pool vehicle.
data speed type i value 0.
function accelerate.
speed = speed + 1.
endfunction.
function show_speed.
write speed.
endfunction.
report xx.
start-of-selection.
*vehicle 1
call function 'accelerate'.
call function 'accelerate'.
call function 'show_speed'.
*vehicle 2
*vehicle 3
*****abap object*******
report xx.
data: ov type ref to vehicle,
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start-of-selection.
do 5 times.
create object ov.
append ov to ov_tab.
enddo.
loop at ov_tab into ov.
do sy-tabix times.
call method ov->accelerate.
enddo.
call method ov->show_speed.
endloop.

Hi
Now try this:
REPORT ZTEST_VEHICLEOO .
PARAMETERS: P_CAR   TYPE I,
            P_READ TYPE I.
*       CLASS vehicle DEFINITION
CLASS VEHICLE DEFINITION.
PUBLIC SECTION.
    CLASS-DATA: MAX_SPEED   TYPE I,
                MAX_VEHICLE TYPE I,
                NR_VEHICLES TYPE I.
    CLASS-METHODS CLASS_CONSTRUCTOR.
    METHODS CONSTRUCTOR.
    METHODS ACCELERATE.
    METHODS SHOW_SPEED.
    METHODS GET_SPEED EXPORTING E_SPEED TYPE I.
PRIVATE SECTION.
    DATA: SPEED      TYPE I,
          NR_VEHICLE TYPE I..
ENDCLASS.
*       CLASS vehicle IMPLEMENTATION
CLASS VEHICLE IMPLEMENTATION.
METHOD CLASS_CONSTRUCTOR.
    NR_VEHICLES = 0.
ENDMETHOD.
METHOD CONSTRUCTOR.
    NR_VEHICLES = NR_VEHICLES + 1.
    NR_VEHICLE = NR_VEHICLES.
ENDMETHOD.
METHOD ACCELERATE.
    SPEED = SPEED + 1.
    IF MAX_SPEED < SPEED.
      MAX_SPEED   = SPEED.
      MAX_VEHICLE = NR_VEHICLE.
    ENDIF.
ENDMETHOD.
METHOD SHOW_SPEED.
    WRITE: / 'Speed of vehicle nr.', NR_VEHICLE, ':', SPEED.
ENDMETHOD.
METHOD GET_SPEED.
    E_SPEED = SPEED.
ENDMETHOD.
ENDCLASS.
DATA: OV     TYPE REF TO VEHICLE,
      OV_TAB TYPE TABLE OF REF TO VEHICLE.
DATA: V_TIMES TYPE I,
      FL_ACTION.
DATA: V_SPEED TYPE I.
START-OF-SELECTION.
DO P_CAR TIMES.
    CREATE OBJECT OV.
    APPEND OV TO OV_TAB.
ENDDO.
LOOP AT OV_TAB INTO OV.
    IF FL_ACTION = SPACE.
      FL_ACTION = 'X'.
      V_TIMES = SY-TABIX * 2.
    ELSE.
      FL_ACTION = SPACE.
      V_TIMES = SY-TABIX - 2.
    ENDIF.
    DO V_TIMES TIMES.
      CALL METHOD OV->ACCELERATE.
    ENDDO.
    CALL METHOD OV->SHOW_SPEED.
ENDLOOP.
SKIP.
WRITE: / 'Higher speed', VEHICLE=>MAX_SPEED, 'for vehicle nr.',
            VEHICLE=>MAX_VEHICLE.
SKIP.
READ TABLE OV_TAB INTO OV INDEX P_READ.
IF SY-SUBRC <> 0.
    WRITE: 'No vehicle', P_READ.
ELSE.
    CALL METHOD OV->GET_SPEED IMPORTING E_SPEED = V_SPEED.
    WRITE: 'Speed of vehicle', P_READ, V_SPEED.
ENDIF.
Try to repeat this using a function group and I think you'll undestand because it'll be very hard to do it.
By only one function group how can u read the data of a certain vehicle?
Yes you can create in the function group an internal table where u store the data of every car: in this way u use the internal table like it was an instance, but you should consider here the example is very simple. Here we have only the speed as characteristic, but really we can have many complex characteristics.
Max

Difference between v$instance and v$thread

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