Difference between Context and Queue in UDF

hi,
i am trying to write udf but i have doubt when do i select Contect and when do i select Queue as my udf ? How do we decide which one i select ?
Thanks & Regards
Naveen

when u go 4 advanced udf functionalites u need this. for simple udf not req to play with queue nor context. the input when using a context or queue will be an array of strings but in simple udf's it is just a single string that u will be accessing. u can also check here:
http://help.sap.com/saphelp_nw2004s/helpdata/en/40/7b8e40496f6f1de10000000a1550b0/content.htm

Similar Messages

Difference between notifiers and queues

Hi, I have a question about notifiers and queues. I try to do a moving average for 6 min, having data with a sampling rate of 25 us. I use a producer/ consumer architecture. The producer loop reads 3 DMA Fifos from my FPGA vi and writes them in three diferent queues. Each queue is beeing read again in three consumer loop, one for each queue. I thought this might be faster??!! If I limit my queue to a certain size than after some minutes I get a timeout error, if I say 0 ms for timeout. I wanted to make sure that nothing will get lost. If I don't limit my queue size ( -1) after 10 minutes I get a message that I don't have enough memory to operate. I also can see that that in Task manager the page file is getting bigger and bigger until 2 gb. So from this poit of view I would assume that my average calculation is to slow and data has to be stored inbetween. So my consumer loop is to slow. Well I don't have any idea how to make my code faster. I also do a cascade for the averaging and the average is beeig calculated adding the new value and subtract the oldest value in the array.
Than I tryed using the notifiers. As I read you can not size a notifier. But what happens if the consumer loop is slower than the producer loop? Do I loose data? When using notifiers I don't get any error messages, like don't have enough memory . So what is the diference between notifiers and queues?
Has also someone any idea how to make the code faster ?
Thanks
Attachments:
mittel_Fifo1+2+3_gra_notif.vi ‏274 KB

Check the number of elements in the queue when running your vi, so you can see if your queue is running full.
Furthermore, your code looks a bit 'dirty'. From that I guess, there is still a lot of improvements that can be made to get the performance you need.
Take a look at the 'ptbypt Mean.vi' (I don't remember the exact name).
Felix
www.aescusoft.de
My latest community nugget on producer/consumer design
My current blog: A journey through uml

Difference between ubbconfig and queues

Ignore my ignorance as I am a newbie,
What is the sort of information contained in ubbconfig and does it actually create the queues and if not who creates the queues once we bounce tuxedo.
I had this situation last week where we created a new ubbconfig and bounced the application and suddenly we had to create the queues again using the scripts.How did we loose the queues in the first place.
Thanks to all nice samaritans.

Hi Vaibhav.
The ubbconfig in a Tuxedo application defines the physical structure of a Tuxedo application (all defined application and system servers, as well as the defined machines for the application).
Optionally, it also defines information on advertised services. The best reference I can point you at for what it does is here: http://edocs.bea.com/tuxedo/tux81/rf5/rf588.htm#1531911 (apologies if you've been there previously)
Booting a Tuxedo application will create the IPC queues for all servers - if this isn't happening, there are some issues with either your server, or possibly something more subtle in your configuration (like a duplicate IPCKEY).
Now, the IPC queues used by servers are completely separate from /Q stable storage queues - these exist either in memory or on disk as separate configurable items. If you have disk-based /Q queues, regenerating your TUXCONFIG should have no effect on them whatsoever, as long as your QMCONFIG file has a different IPCKEY to your UBBCONFIG file.
Does that help at all?
 
Kevin Powe
http://www.integral-techsolutions.com

What is Context and queue?

Q.1What is context and queue in graphical mapping?
Q.2What is the difference between context and queue in graphical mapping and how these concepts are useful in mapping?

Hi,
Context Change
Message mapping works internally by using queues
If no further elements are imported at a particular hierarchy level, a Context Change is inserted in the queue
Use node functions to handle changes in the message hierarchy.
Context changes have impact on:
User-Defined Functions
Breaking and inserting of hierarchy levels Manipulation of queues ant contexts
Explicit context selection on source elements and nodes
Using node functions
removeContexts: deletes all context changes of a queue
SplitByValue: insert additional context changes in a queue
Check this link for all details.
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/be05e290-0201-0010-e997-b6e55f9548dd
A tool to display queues:
-Upload or create source xmldocument in test mode
- Right-click on box representing element or function
- Select Show queue
Also check out this link
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/be05e290-0201-0010-e997-b6e55f9548dd
Hope this will help you.
Regards
Aashish Sinha
PS : reward points if helpful

Difference Between Normal and External Context Mapping

Hi,
I wonder the Difference Between Normal and External Context Mapping.
I1ve already read the docs and articles but I didnt understand.
Thanks,
Jorge Luiz
Edited by: Jorge Castro on Oct 9, 2008 4:23 PM

Jorge,
With this type of Mapping (also called Reverse Mapping) you can map the context of an using component, to that of the used component.
You can find an example of this concept in WDA ALV: If you look at component SALV_WD_TABLE (which you declare as used when you intend to use ALV), you'll see that it has a node DATA declared as external. In your using component, you map your actual data node to this node.
This allows the ALV to leave the DATA node type open and so to be reused, adjusting it's structure depending on the using component's data.
Edited by: Alejandro Bindi on Oct 9, 2008 4:42 PM
Made a mistake! Have not used this in a while...Ext. mapping is the OTHER way...Using -map-> Used Fixed.

What is the difference between SWF and F4V in the context of Streaming or progressive Download?

Hello everybody,
I am absolutely a beginner in working with Captivate and furthermore my technological know how is not that good.
So, I have problems to understand if the export formats SWF and F4V are both capable to be published in the Internet as streaming video and as progressive Download? Well so, I do not really understand the difference between streaming and progessive download either?
Furthermore I was asking myself if this issue depends on how I imported flash videos (there are these two options) in my Captivate project during the production phase?
I would be very thankful for some helping information!
Greetings,
Mareike the beginner

Welcome to our community
I'm not certain I fully understand the differences myself, but will toss out what I believe to be true about the formats. Hopefully, if I'm incorrect in my bellief, someone with more definitive knowledge will chime in.
It was explained to me a couple of years back and is my understanding that "streaming" only applies to a video based format such as F4V, FLV and it doesn't apply to SWF. With SWF, you may specify a preload value. So when the SWF transmits from the web server to the PC, a certain percentage has to be received before play begins. But that's not streaming. It's preloading.
For streaming to occur, the web server establishes a communication channel between the server and the destination PC. This channel is monitored to see what speed is in use. Only enough information is then transmitted to be comfortable at that speed. If the speed improves during the connection, the server serves data at a faster rate. If the connection degrades, the information transmitted is also scaled back so as to accommodate the lower speed.
With SWF, after it has all been downloaded, a savvy user is able to poke around in their temporary internet files and save the SWF for play later. With streaming, this isn't possible because as the stream is viewed, it evaporates from memory.
Seriously hoping others will chime in here to confirm or deny this.
Cheers... Rick
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MAIN DIFFERENCES BETWEEN PARALLEL AND SEQUENTAIL PRCESSING???

HI PALS,
I WANT THE COMPLETE DIFFERENCES BETWEEN PARALLEL AND SEQUENTIAL PROCESSING!
IN THE CONTEXT OF RFC.

Hi
Parallel Processing
To achieve a balanced distribution of the system load, you can use destination additions to execute function modules in parallel tasks in any application server or in a predefined application server group of an SAP system.
Parallel-processing is implemented with a special variant of asynchonous RFC. Itu2019s important that you use only the correct variant for your own parallel processing applications: the CALL FUNCTION STARTING NEW TASK DESTINATION IN GROUP keyword. Using other variants of asynchronous RFC circumvents the built-in safeguards in the correct keyword, and can bring your system to its knees
Details are discussed in the following subsections:
·        Prerequisites for Parallel Processing
·        Function Modules and ABAP Keywords for Parallel Processing
·        Managing Resources in Parallel Processing
Prerequisites for Parallel Processing
Before you implement parallel processing, make sure that your application and your SAP system meet these requirements:
·        Logically-independent units of work:
The data processing task that is to be carried out in parallel must be logically independent of other instances of the task. That is, the task can be carried out without reference to other records from the same data set that are also being processed in parallel, and the task is not dependent upon the results of others of the parallel operations. For example, parallel processing is not suitable for data that must be sequentially processed or in which the processing of one data item is dependent upon the processing of another item of the data.
By definition, there is no guarantee that data will be processed in a particular order in parallel processing or that a particular result will be available at a given point in processing.
·        ABAP requirements:
¡        The function module that you call must be marked as externally callable. This attribute is specified in the Remote function call supported field in the function module definition (transaction SE37).
¡        The called function module may not include a function call to the destination u201CBACK.u201D
¡        The calling program should not change to a new internal session after making an asynchronous RFC call. That is, you should not use SUBMIT or CALL TRANSACTION in such a report after using CALL FUNCTION STARTING NEW TASK.
¡        You cannot use the CALL FUNCTION STARTING NEW TASK DESTINATION IN GROUP keyword to start external programs.
·        System resources:
In order to process tasks from parallel jobs, a server in your SAP system must have at least 3 dialog work processes. It must also meet the workload criteria of the parallel processing system: Dispatcher queue less than 10% full, at least one dialog work process free for processing tasks from the parallel job.
Function Modules and ABAP Keywords for Parallel Processing
You can implement parallel processing in your applications by using the following function modules and ABAP keywords:
·        SPBT_INITIALIZE: Optional function module.
Use to determine the availability of resources for parallel processing.
You can do the following:
¡        check that the parallel processing group that you have specified is correct.
¡        find out how many work processes are available so that you can more efficiently size the packets of data that are to be processed in your data.
·        CALL FUNCTION Remotefunction STARTING NEW TASK Taskname DESTINATION IN GROUP:
With this ABAP statement, you are telling the SAP system to process function module calls in parallel. Typically, youu2019ll place this keyword in a loop in which you divide up the data that is to be processed into work packets. You can pass the data that is to be processed in the form of an internal table (EXPORT, TABLE arguments). The keyword implements parallel processing by dispatching asynchronous RFC calls to the servers that are available in the RFC server group specified for the processing.
Note that your RFC calls with CALL FUNCTION are processed in work processes of type DIALOG. The DIALOG limit on processing of one dialog step (by default 300 seconds, system profile parameter rdisp/max_wprun_time) applies to these RFC calls. Keep this limit in mind when you divide up data for parallel processing calls.
·        SPBT_GET_PP_DESTINATION: Optional function module.
Call immediately after the CALL FUNCTION keyword to get the name of the server on which the parallel processing task will be run.
·        SPBT_DO_NOT_USE_SERVER: Optional function module.
Excludes a particular server from further use for processing parallel processing tasks. Use in conjunction with SPBT_GET_PP_DESTINATION if you determine that a particular server is not available for parallel processing (for example, COMMUNICATION FAILURE exception if a server becomes unavailable).
·        WAIT: ABAP keyword
WAIT UNTIL
Required if you wish to wait for all of the asynchronous parallel tasks created with CALL FUNCTION to return. This is normally a requirement for orderly background processing. May be used only if the CALL FUNCTION includes the PERFORMING ON RETURN addition.
·        RECEIVE: ABAP keyword
RECEIVE RESULTS FROM FUNCTION Remotefunction
Required if you wish to receive the results of the processing of an asynchronous RFC. RECEIVE retrieves IMPORT and TABLE parameters as well as messages and return codes.
Managing Resources in Parallel Processing
You use the following destination additions to perform parallel execution of function modules (asynchronous calls) in the SAP system:
In a predefined group of application servers:
CALL FUNCTION Remotefunction STARTING NEW TASK Taskname
DESTINATION IN GROUP Groupname
In all currently available and active application servers:
CALL FUNCTION Remotefunction STARTING NEW TASK Taskname
DESTINATION IN GROUP DEFAULT
Sequential Processing
In the following cases, the system chooses sequential (non-parallel) processing:
●      In table RSADMIN, entry QUERY_MAX_WP_DIAG has value (column value) 1.
●      The entire query consists of one sub-access only.
●      The query is running in a batch process.
●      The query was started from the query monitor (transaction RSRT) using various debug options (for example, SQL query display, execution plan display). See, Dividing a MultiProvider Query into Sub-Queries.
●      The query requests non-cumulative key figures.
●      Insufficient dialog processes are available when the query is executed. These are required for parallel processing.
●      The query is configured for non-parallel processing.
●      You want to save the result of the query in a file or a table.
In Release SAP NetWeaver 7.0, the system can efficiently manage the large intermediate results produced by parallel processing. In previous releases, the system terminated when it reached a particular intermediate result size and proceeded to read data sequentially. This is no longer the case. Therefore, the RSADMIN parameter that was used in previous releases for reading a MultiProvider sequentially is no longer used.
Reward If Helpfull,
Naresh

Context Vs Queue in UDF

Can you give an idea about Context Vs Queue in UDF????

Hi ! Gabriel
this indicated which values from your XML will be inserted into your funciton
either one - value
from one context only - context
or all - queue
check this page to understand
Working with Contexts or Queues
http://help.sap.com/saphelp_nw04/helpdata/en/f8/2857cbc374da48993c8eb7d3c8c87a/content.htm
http://help.sap.com/saphelp_nw04/helpdata/en/f8/2857cbc374da48993c8eb7d3c8c87a/content.htm
look into this link that explains about the same.
value ---> is a value for the input parameter. It may be a single value or multiple values.
Queue-----> it is an entire instance of XML message. That means, if you have duplicates of a node, all those contexts will be includedin Queue, which is passed to UDF.
Context -
> refers to a particular context of the XML message.
Please refer to the following document which comprehensively explain differences b/w the various options with examples
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/9202d890-0201-0010-1588-adb5e89a6638https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/9202d890-0201-0010-1588-adb5e89a6638
http://help.sap.com/saphelp_nw04/helpdata/en/d2/58cd3b11571962e10000000a11402f/frameset.htm
There r 2 types of UDF - Simple and Advanced- Simple UDFs uses Value, wherein we can manipulate only one value (input is one String). Therefore a single string is expected as input and the output would also b a single string.
- Advanced UDFs uses Context or Queue, where you manipulate many values (input is an array of Strings).
This will help u
http://help.sap.com/saphelp_nw2004s/helpdata/en/40/7b8e40496f6f1de10000000a1550b0/content.htm
Thanks!!
Regards
Abhishek

What is the main difference between ws_upload and gui_upload?

Hi All,
What is the main difference between ws_upload and gui_upload?
In what contexts should we use these two function modules??
Thanks,
Creasy

search the forum before posting.
You can find lot of posts related.

What is the Difference Between Adapter and Proxy

Hi Master,
I want to know the Difference Between Adapters and Proxies.
And when we are using proxies and Adapters....
Regards,
SReddy

Adapters are part of the Adapter Framework. Adapters provide the technical connectivity to enable the integration of SAP and non-SAP applications through XIs Integration Engine.Again, Adapters are used for connectivity from and to external systems with XI that cannot communicate via proxies.Adapters are only required in SAP systems older than 6.20 and external systems.
Systems based on 6.20or higher can communicate directly with proxies.
The literal definition of a proxy is an object / process authorized to act for another; an agent or a substitute. In simpler terms, proxies in the XI context are objects used to encapsulate the creation (from a sender system) or parsing of XML (at a receiver system) as well as the communication with the relevant runtime components required to send or receive those messages.
Proxies are generated from Message Interface in IR.
The Proxy Runtime controls these objects / processes, and can itself be controlled by the applications it communicates with. The Proxy Runtime currently has the following components available: 1. ABAP Proxy Runtime Communication using XI or Web Services a. Web Service Runtime 2. Java Proxy Runtime Communication using XI (J2EE) The objects that the Proxy Runtime then controls are created via Proxy Generation, for both ABAP and Java. In the following sections a client proxy is used by an application to send messages outside of the system it resides in (normally to the IS in this context). Conversely, a server proxy is used by an application to receive messages from sources outside itself (again, normally the IS in this context).

What's the Difference Between OLAP and OLTP?

HI,
What's the difference between OLAP and OLTP ? and which one is Best?
-Arun.M.D

Hi,
The big difference when designing for OLAP versus OLTP is rooted in the basics of how the tables are going to be used. I'll discuss OLTP versus OLAP in context to the design of dimensional data warehouses. However, keep in mind there are more architectural components that make up a mature, best practices data warehouse than just the dimensional data warehouse.
Corporate Information Factory, 2nd Edition by W. H. Inmon, Claudia Imhoff, Ryan Sousa
Building the Data Warehouse, 2nd Edition by W. H. Inmon
With OLTP, the tables are designed to facilitate fast inserting, updating and deleting rows of information with each logical unit of work. The database design is highly normalized. Usually and at least to 3NF. Each logical unit of work in an online application will have a relatively small scope with regard to the number of tables that are referenced and/or updated. Also the online application itself handles the majority of the work for joining data to facilitate the screen functions. This means the user doesn't have to worry about traversing across large data relationship paths. A heavy dose of lookup/reference tables and much focus on referential integrity between foreign keys. The physical design of the database needs to take into considerations the need for inserting rows when deciding on physical space settings. A good book for getting a solid base understanding of modeling for OLTP is The Data Modeling Handbook: A Best-Practice Approach to Building Quality Data Models by Michael C. Reingruber, William W. Gregory.
Example: Let's say we have a purchase oder management system. We need to be able to take orders for our customers, and we need to be able to sell many items on each order. We need to capture the store that sold the item, the customer that bought the item (and where we need to ship things and where to bill) and we need to make sure that we pull from the valid store_items to get the correct item number, description and price. Our OLTP data model will contain a CUSTOMER_MASTER, A CUSTOMER_ADDRESS_MASTER, A STORE_MASTER, AN ITEM_MASTER, AN ITEM_PRICE_MASTER, A PURCHASE_ORDER_MASTER AND A PURCHASE_ORDER_LINE_ITEM table. Then we might have a series of M:M relationships for example. An ITEM might have a different price for specific time periods for specific stores.
With OLAP, the tables are designed to facilitate easy access to information. Today's OLAP tools make the job of developing a query very easy. However, you still want to minimize the extensiveness of the relational model in an OLAP application. Users don't have the wills and means to learn how to work through a complex maze of table relationships. So you'll design your tables with a high degree of denormalization. The most prevalent design scheme for OLAP is the Star-Schema, popularized by Ralph Kimball. The star schema has a FACT table that contains the elements of data that are used arithmatically (counting, summing, averaging, etc.) The FACT Table is surrounded by lookup tables called Dimensions. Each Dimension table provides a reference to those things that you want to analyze by. A good book to understand how to design OLAP solutions is The Data Warehouse Toolkit: Practical Techniques for Building Dimensional Data Warehouses by Ralph Kimball.
Example: let's say we want to see some key measures about purchases. We want to know how many items and the sales amount that are purchased by what kind of customer across which stores. The FACT table will contain a column for Qty-purchased and Purchase Amount. The DIMENSION tables will include the ITEM_DESC (contains the item_id & Description), the CUSTOMER_TYPE, the STORE (Store_id & store name), and TIME (contains calendar information such as the date, the month_end_date, quarter_end_date, day_of_week, etc).
Database Fundamentals > Data Warehousing and Business Intelligence with Mike Lampa
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What's the difference between "PreparedStatement" and "Statement"?

What's the difference between "PreparedStatement" and "Statement"?
Which is better??????

Read the docs for the two classes. The differences are apparent there.
Which one is better depends on your needs. I think that constructing and executing a PreparedStatement can be a bit less performant than just a Statement, if you're only executing the query one time. But I don't think that difference will normally be noticable in the context of a given application.
Additionally, if you have to pass any dates or strings to the query, you'll want PreparedStatement's parameters, rather than trying to format and escape things in the query string.

Difference between tRFC and RFC

Hi Experts,
Can any one help me in details to differentiate tRFC from RFC in their application perspective.
And also let me know the role of ALE and BAPI in both the connection log.ie,Where we have to use ALE and BAPI.
Regards
Kumar

Hi,
RFC = Remote Function Call and TRFC = Transactional Remote Function Call
Transactional RFC and Queued RFC are variants of the Remote Function Call that make the data transfer between different SAP R/3 systems more reliable and more secure.
Transactional RFC
http://help.sap.com/saphelp_nw04/helpdata/en/8b/ceea3b31aac554e10000000a114084/content.htm
RFC Help link
http://help.sap.com/saphelp_nw04/helpdata/en/b0/eae2a889e711d2956500a0c94260a5/frameset.htm
Refer BAPI & ALE
what is difference between BAPI and ALE
Re: ALE & BAPI communication
Re: bapi-ale interface
/Srinivas

Differences between rfc and ale/idoc.

hi ..
       will u please send the differences between rfc and ale/idoc's.

Hi,
Please reward with points if helpful................
ALE is SAP proprietary technology that enables data communications between two or more SAP R/3 systems and/or R/3 and external systems. There are three layers in ALE system: application services, distribution services, and communication services.
For communication services, ALE performs a Remote Function Call (RFC) using the port definition and RFC destination specified by the customer model. RFC is used to communicate between applications of different systems in the SAP environment includes connections between SAP systems as well as between SAP systems and non-SAP systems. Remote Function Call (RFC) is the standard SAP interface for communication between SAP systems. The RFC calls a function to be executed in a remote system.
Means of creating and operating distributed applications.
The purpose of Application Line Enabling is to guarantee a distributed, but integrated, R/3 installation. This involves business-controlled message exchange with consistent data across loosely linked SAP applications.
Application integration is achieved not via a central database, but via synchronous and asynchronous communication.
Application Link Enabling comprises the following three layers:
application services
distribution services
communication services
Two Development Models
     Distribution using BAPIs
     Distribution using Message type
The programming model "Distribution using message types" contains the definitions of message types and IDoc types and the ABAP code for processing inbound and outbound IDocs.
Defining message types and IDoc types:
If you want to create message type enhancements for master data distribution, you also have to create a new message type for each enhancement.
The ALE interface does not allow you to create different segment data for different IDoc types for the same message type.
Writing ABAP code:
         Outbound Processing
           Inbound Processing
You can find information on other ALE functions under:
                               Master Data Distribution
                              Communicating with Non-R/3 Systems
1. The Remote Function Call facility allows you to call an R/3 Function module on a remote machine.
2. To communicate between two R/3 Systems and also with an External System. External Application program also can call these function module for integration.
3. RFC or sRFC - Synchronous RFC
                 aRFC - Asynchronous RFC
                  tRFC - Transactional RFC
                  qRFC - Queued RFC (I.e. Serialization of tRFC)
Types of RFC Call
Synchronous
CALL FUNCTION Func Destination Dest
CALL FUNCTION func DESTINATION 'NONE' ...
CALL FUNCTION func DESTINATION BACK' ...
Asynchronous
CALL FUNCTION func STARTING NEW TASK taskname
PERFORMING form ON END OF TASK
RECEIVE RESULTS FROM FUNCTION func
Thanks
sivaparvathi

Differences between C350D and C350

Hello,
what is the differences between C350D and C350?
Thanks

Hi There,
C3x0D was designed as an outbound only box, the idea being that your internal servers would send mast amounts of mail to the C3x0D and we process and deliver.
The main differences are:
1: Multiple IP Interfaces
Deliver from 256 source addresses to minimise rate limiting issues
2: Configurable Source IP per destination
Nominate specific source IP for certain destinations
3: Virtual Gateways
10,000 Concurrent connections, delivery queue per destination
4: Domain Key signatures
Validate you are the trusted source of the mail
5: Destination Controls
Control delivery rates to suit ISP acceptance policies
6: Configurable Bounce profiles per destination
Customize retries and delay periods for differing destinations
7: Message and Content Filters
Apply disclaimers, unsubscribe information and tracking headers
8: Optional Sophos engine
Ensure clean mail only is sent
More information on the support portal regarding C350D, or messenger me and I will send you the pdf.
Laters :)

Difference between Context and Queue in UDF

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