Best option for data replication

Hello:
II am trying to understand the pros of cons of using snapshots, materialized views or replication to maintain data concurrency between a primary table and its copy in another database.
In addition, there are tables dependent on this copy in the other database.
1. Using materialized Views: Use this to keep the two tables in sync. Have triggers on this materialized view to handle inserts/updates/deletes to the primary table.
My question is if I do a full refresh, does it drop all the rows and reinsert? In that case, would it fail due to referential integrity? For instance, if a row is deleted in the primary table and if that row is referenced in the dependent tables, it would fail, wouldn't it?
2. Is Snapshot an option? I still have the same question as above.
3. If 1 and 2 are not options, do I have to replicate the data?
Thanks for your advice.

You can have triggers on a materialized view (or on the table that is the source for the materialized view). It's relatively rare that you ought to have triggers on a materialized view, but it is certainly possible. If the goal is to have triggers that handle referential integrity, though, that can be rather dangerous in general.
I would tend to argue that a parent table and all its child tables ought to exist in a single database. Having a parent table in one database and child tables in another that refer to a materialized view, while possible, is a design that will generally overcomplicate life. If you mean that that there will be a parent table and child tables on the master site that will be replicated using materialized views on the destination site, then you'd just need a refresh group.
If you do a full refresh, the mechanism depends on whether the materialized view is in a refresh group. If it is, Oracle will delete all the rows and re-insert. If it is not, Oracle will truncate the rows and re-insert.
Justin

Similar Messages

I need options for data replication within production db and dimensional db

Hi,
I'm looking for options on how to solve this issue. We've 2 databases, one is our production, operative database, used by around 400 users at a time, and another one, which is our dimensional model of the same info, used to obtain reports. We also have a lot of ETL's (extract, transform and load) processes running every night to update the dim model.
Mi problem is that we have some online reports, and nowadays, we're getting data from the operational database, causing a performance issue in online operations. We want to migrate this reports to the dimensional model, and we're trying to find the best options for doing this.
Options that we're considering are ETL's process running continuously every XX minutes, materialized views, ETL's on demand, and others.
Our objective is to minimize performance issues on transactional database.
We're using Oracle 8i (yes, the oldie one) and Reporting Services as report engine (reports just run a pkg to get data).
Any option is welcome.
Thx in advance.
Regards,
Adrian.

The best option for you if the performance is the
most important is ORACLE STREAMS. Also is the most
complex but the final results are very goodsAgreed. As User12345 points out, though, that requires Oracle 9.2 or higher.
Another option is the materialized views with Fast
Refresh , that need the materialized view logs in
the master site.
The first load is expensive but if you refresh each
15 minutes the cost is not high.I'd be careful about making that sort of statement. The overhead of both maintaining materialized view logs (which have to be written to synchronously with the OLTP transactions and which impose an overhead roughly equivalent to a trigger on the underlying table) and doing fast refreshes every 15 minutes can be extensive depending on the source system. One of the reasons that Streams came about was to limit this overhead.
For refresh i execute a cron shell that run the
DBMS_MVIEW.REFRESH package. my experience with group
refresh not was goodWhat was your negative experience with refresh groups? I've used them regularly without serious problems. Manual refreshes of individual materialized views against an OLTP system would scare the pants off me because you'd inevitably end up with transactionally inconsistent views of the data (i.e. child records would be present with no parent record, updates that affect multiple tables would be partially replicated until the next refresh, etc). Trying to move that sort of inconsistent data into a different data model, and trying to run reports off that data, would seem highly challenging at a minimum. Throwing everything into a single refresh group so that all the materialized views are transactionally consistent, or choosing a handful of refresh groups for those tables that are related to each other, seems like a far easier way to build a system.
Justin

What is the best option for tethering my IPhone 4s with my iPad? (the iPad is wifi only)

What is the best option for tethering my IPhone 4s with my iPad? (the iPad is wifi only)

#1. Understand that if you switch carriers, you can NOT take your existing iPhone with you. It won't work. You will need to purchase a new one.
#2. Your only choices are Sprint and Verizon. Decide who has the better coverage in your area. Keep in mind that you will NOT be able to get simultaneous voice and 3G data on either of these, as their CDMA networks do not support it. The U.S. T-Mobile network is not supported and is not fully compatible with the iPhone as it operates on a rarely used frequency compared to the rest of the world.
#3. What in the world are "niners"? Do you mean you want to be able to keep your existing "phone numbers"? If so, that should be no problem. Most numbers in the US are now portable.
#4. Consider WHY you want to switch. If the issue is really price, you're not going to see much of a difference. A few dollars a month at best for comparable voice and data plans.

Whats the best option for passing parameters between tf?

Dear All,
I have three Task Flows:
1. TF1
     - Main Taskflow that calls a web service to gather its data
2. TF2
     - Secondary taskflow which receives a parameter and depending on the value of the parameter received will display its data accordingly. Generally any data
     is feed from TF1
3. TF3
     - Same as TF2Use Case:
All three TF will be dropped to the page as Regions in a Webcenter Portal Application. Changes in TF1 should propagate into TaskFlow 2.
Question:
1. How do I configure that changes in TF1 would be propagated back into task flow 2 and 3 and whats the best option for this?
2. At runtime, user can choose to edit the page and TF2 and TF3 can be deleted but TF 1 should remain as the source of information.
Given the scenario above:
- shall I wire the taskflows via page parameters?
- contextual events?
What are the considerations that needs to be thought of. I havent done such requirements before.
Please help.
Webcenter 11.1.1.6

Contextual events seem to be the best case.
This way you can trigger whenever you want. Web services can be slow so you can trigger the event when the gathering of the data has been finished and then pass some value on the event.
An event also has a payload so it's an ideal scenario to add the data from the service on it so you can use it in the other TF's.
In order to manage the deletion of the TF1, you can use the UI events on the composer: http://docs.oracle.com/cd/E23943_01/webcenter.1111/e10148/jpsdg_page_editor_adv.htm#CHDHHFDJ

Best option for remote downlinking

I am going to be streaming video/audio to some clients all over the US, all of which will be using PC's.
90% of the time they are going to be in locations where a hardline to the internet isn't possible.
What is the best option for them to access my stream as well as provide me back a webcam feed?
Is a cell phone card as good as it gets now?
Thanks,
Chris

Your options here are entirely and completely dependent on the local network services. This could include cellular data packet networks (and there are various flavors), WISP, satellite data (Iridium, GlobalStar and such), dial-up at speeds anywhere from roughly 50 kilobaud down to unusable, local WiFi networks, or otherwise.
Satellite networks are the most pervasive, though do have technical limits and do have among the highest of the high prices. I'd not want to stream video (on a budget) on such networks.
If these clients are going to be located are fixed sites or specific geographic areas, you can potentially set up backhaul wireless networks. If local network coverage is bad (and the local terrain allows it), you can potentially set up your own WISP, and provide coverage for yourself and potentially others.
If this is the United States, you're going to encounter some rather severe limitations and network fragmentation outside the metropolitan areas. Inside the metropolitan areas, there are almost always options. Outside those areas, you'll find that some countries will tend to have more pervasive network services, and better wireless coverage. (DSL and cellular data coverage is very far from pervasive locally, and this is located in one of the most populous counties in a small US state. And the local geography is not particularly amenable to a WISP operating on a budget.)

Best options for uncompressed HD master?

I've just finished my first feature-length project in HDV on FCP, and I have some questions about output. In the past I've always been editing SD DV under 60 mins, so master output was always easy. But between the HDV and the 90 min. run time, things are a little more complicated.
We shot and edited in native HDV 1080/60i. We've rendered our final master sequence in HD ProRes, but I don't know where to go from here. These are my main questions:
1. My primary distribution is going to be SD DVD, but I want to keep an uncompressed HD master file backed up on multiple hard drives. What's my best output option for such a file? Can I just export a self-contained QT in sequence settings? Will that apply compression I don't want? Is there a better output option in Compressor?
2. Keep interlaced or deinterlace? Again, most people will be seeing this as an SD DVD.
3. I'd also like to get a local video outfit to make an HD tape master for more secure long-term archiving. What tape format is recommended?
4. Question I should have asked but didn't? Please, do tell.
Thanks in advance for any help.
Stu

Ken Summerall, Jr. wrote:
The absolute best quality that you are going to get is by exporting a QT movie using current settings and making it self contained. Since you shot and edited in an HDV sequence this will add no further compression (remember that HDV is already heavily compressed).
Uh-oh. That's not actually correct.
HDV is relatively unusual as shooting formats go, in that it's a GOP format, as opposed to an I-frame format. In I-frame formats, each frame of footage (or pair of fields, if you're shooting interlaced) is compressed all by itself, independently of all other frames (or field-pairs). But in a GOP format, a number of frames are compressed together — that's what "GOP" means: "group of pictures." The first frame is compressed independently, then the next frame is described in terms of what's different from the previous frame.
When you edit HDV +and then export it as HDV again,+ whether to videotape or to a Quicktime, the GOPs must be "conformed." As you edit, you make cuts that break the GOP structure, so the timeline cuts from the middle of one GOP to the middle of another without including the first frame on which that second GOP depends. So when you export or lay off, Final Cut has to go through and convert a bunch of I-frames to B- or P-frames, and convert a bunch of B- or P-frames to I-frames.
In essence, exporting or laying off HDV imposes a compression hit. You will reduce the quality of your footage.
Since the question was about the best option for mastering, HDV is +definitely not it.+ Would it be okay? That depends on the footage, and on how picky you are. But it's not the best option. The best option is to master to a (ha ha) mastering format. Uncompressed 8-bit, Uncompressed 10-bit and ProRes are good choices here.
As for tape … that's tougher. You can absolutely send an uncompressed or ProRes Quicktime file to a dubbing house and get it laid off to videotape, but the question is to what format? HDV is a poor choice, because of the aforementioned compression hit you take when conforming the GOPs. DVCPRO HD would actually be a step down for you, because it would downsample your 1440x1080 native footage (or your 1920x1080 master, if you chose to upres) to 1280x1080.
That leaves HDCAM and HDCAM SR. If you've done things like color correction or compositing in a 10-bit color space — or even long-slow dissolves to or from black, which is one of the places where 8-bit really falls apart on you — choose HDCAM SR. HDCAM is an 8-bit format only, and you'll lose color precision if you go to that format. But if you stayed 8-bit all the way through your workflow, then you can go to HDCAM without any real problems.
Note that both HDCAM and HDCAM SR +are compressed formats.+ Your only option for uncompressed HD videotape is D6, and good luck finding a Voodoo recorder nearby. But HDCAM and SR are good enough for professional mastering, so they'll surely be good enough for you as well. And they're both available in 94- and 124-minute lengths, so you can master your whole feature on a single tape.
(While you're at it, consider getting your uncompressed or ProRes master file dubbed off to a data tape format as well. You worked really hard on this project, so it makes sense to be a little paranoid about preserving the fruit of your labors.)

Select-options for date field.

Hi all,
i need to give select options for Date field.How can i give that.
Thanks & Regards
Ravi.

Hi Ravi,
Use the Component WDR_SELECT_OPTIONS to include select options in Web Dynpro ABAP. Follow these steps:
1. In your Component , "Used Componet" tab add Component WDR_SELECT_OPTIONS . Component Use can be any name that you want to give, eg SELECT_OPTIONS
2. Go to the View where you want to include the Date Select Options. I am assuming that you already have an Attribute of Type DATS in your context.
3. View: Properties Tab:Create Controller Usage and select
SELECT_OPTIONS     WDR_SELECT_OPTIONS
SELECT_OPTIONS     WDR_SELECT_OPTIONS     INTERFACECONTROLLER
4. View Layout Tab:Include a View Container. In this view container we will show the Date Select Options.
5. View Attributes Tab: Create Following two attributes:
M_HANDLER type IF_WD_SELECT_OPTIONS
M_WD_SELECT_OPTIONS type IWCI_WDR_SELECT_OPTIONS
6: View Methods Tab: Create a method eg CREATE_SELECTION_SCREEN. Call this method in the WDDOINIT of the view.
7:CREATE_SELECTION_SCREEN: Write following Code:
* Data Declaration
data:
        lt_range_table TYPE REF TO DATA.
data:
        lr_componentcontroller TYPE REF TO IG_COMPONENTCONTROLLER,
        lr_componentusage TYPE REF TO IF_WD_COMPONENT_USAGE.
* Execution
* Create Used Component
lr_componentusage = wd_this->wd_cpuse_select_options( ).
if LR_COMPONENTUSAGE->HAS_ACTIVE_COMPONENT( ) is initial.
    lr_componentusage->create_component( ).
endif.
* Get pointer to interface controller of select options
wd_this->M_WD_SELECT_OPTIONS = wd_this->wd_cpifc_select_options( ).
* initialize selction screen
wd_this->M_HANDLER = wd_this->M_WD_SELECT_OPTIONS->init_selection_screen( ).
* Create Range Table for: Date
CALL METHOD WD_THIS->M_HANDLER->CREATE_RANGE_TABLE
    EXPORTING
      I_TYPENAME     = 'DATS'
    RECEIVING
      RT_RANGE_TABLE = lt_range_table.
* Add Selection Field for: Date
CALL METHOD WD_THIS->M_HANDLER->ADD_SELECTION_FIELD
    EXPORTING
      I_ID                         = '<name of date attribute in the context>'
*      I_WITHIN_BLOCK               = MC_ID_MAIN_BLOCK
*      I_DESCRIPTION                =
*      I_IS_AUTO_DESCRIPTION        = ABAP_TRUE
      IT_RESULT                    = lt_range_table
*      I_OBLIGATORY                 = ABAP_FALSE
*      I_COMPLEX_RESTRICTIONS       =
*      I_USE_COMPLEX_RESTRICTION    = ABAP_FALSE
*      I_NO_COMPLEX_RESTRICTIONS    = ABAP_FALSE
*      I_VALUE_HELP_TYPE            = IF_WD_VALUE_HELP_HANDLER=>CO_PREFIX_NONE
*      I_VALUE_HELP_ID              =
*      I_VALUE_HELP_MODE            =
*      I_VALUE_HELP_STRUCTURE       =
*      I_VALUE_HELP_STRUCTURE_FIELD =
*      I_HELP_REQUEST_HANDLER       =
*      I_LOWER_CASE                 =
*      I_MEMORY_ID                  =
*      I_NO_EXTENSION               = ABAP_FALSE
*      I_NO_INTERVALS               = ABAP_FALSE
*      I_AS_CHECKBOX                = ABAP_FALSE
*      I_AS_DROPDOWN                = ABAP_FALSE
*      IT_VALUE_SET                 =
*      I_READ_ONLY                  = ABAP_FALSE
*      I_DONT_CARE_VALUE            =
*      I_EXPLANATION                =
      I_TOOLTIP                    = 'Select Date'.
8: To Fetch Data entered in the selection field, write following code on action of button click:
data:
        lt_date type REF TO DATA.
FIELD-SYMBOLS:
                 <fs_date> TYPE table.
* retrieve Date from Select Options
CALL METHOD WD_THIS->M_HANDLER->GET_RANGE_TABLE_OF_SEL_FIELD
    EXPORTING
      I_ID           = '<attrib_name>'
    RECEIVING
      RT_RANGE_TABLE = lt_date.
* assign Date Field Symbol
ASSIGN lt_date->* to <fs_date>.
9: Windows Window Tab: In the View Conatiner, embed the WND_SELECTION_SCREEN view from SELECT_OPTIONS component Usage of WDR_SELECT_OPTIONS component.
Regards,
Reema.

Best practice for data migration install v1.40 - Error 2732 Directory manag

Hi
I'm attempting to install SAP Best Practice for Data migration 1.40 on Win Server 2008 R2 (64 bit).
Prerequisite error
Installation program stops with missing file error
The following file was not found
... \migration\InstallationWizard\BusinessObjects Data Services\setup.exe
The file is necessary for successful installation. Please connect to internet or refer to Quick Guide (available on SAP note 1527151) for information regarding the above file.
Windows installer log displays
Error 2732 Directory Manager not initialized
SAP note 1527151 does not exist or is internal.
Any help appreciated on what is the root cause of the error as the file does not exist in that folder in the installation zip file.
Other prerequisite of .NET 3.5.1 met already.
Patch is released since 20.11.2011 so I presume that it is a good installation set.
Thanks,
Alan

Hi Alan,
There are details on data migration v1.4 installations on SAP website and market place. The below link should guide to the right place. It has a power point presentation and other useful links as well.
http://help.sap.com/saap/sap_bp/DMS_V140/DMS_US/html/index.htm
Arun

Best option for Asynchronous method invocation? JMS or Pure Java Thread

Hi,
We've a swing based Client application which is supposed to run with a server in J2EE environment. Some process like Search etc are very time consuming. So we are going for asynchronous process.
Now the question is to find a best option for this. Two possible candidates are
1. JMS
2. Java Thread.
Can anybody suggest me which one is the best option in this context?

Actually my thought was the issues with code maintainability.Maintainability is different issue, it is much related to OOAD and design pattern you might want to choose to avoid coupling (thus high reusability and maintainability - eg: for future enhancement, etc)..
public interface SearchService {
     public static class DefaultFactory {
             public SearchService getInstance() {
                      return HttpSearchService.getInstance();
     public void search (String[] keywords, Observer obs);
public class HttpSearchService implements SearchService {
     public static HttpSearchService getInstance() {
            ... bla bla bla singleton ...
     public void search(final String [] keywords, final Observer obs) {
                 (new Thread() {
                          public void run() {
                                .. do http request ...
                                List result = ... parse http response ...
                                obs.update(list);
                 }).start();
SearchService ss = SearchService.DefaultFactory.getInstance();
ss.search( new String[] { "get", "me", "my" , "dukes" }, myTableModel );
...You can, in future, replace the default factory HttpSearchService with something faster, more appropriate SearchService, without changing many codes.
rgds,
Alex

Best Course for Data Warehousing

Hi,
I am planning to join data warehousing course .I heard there is lot courses in data warehousing .
Data warehousing with ETL tools or
Data warehousing with Crystal Reports or
Data warehousing with Business object or
Data warehousing with Informatica or
Data warehousing with Bo-Webel or
Data warehousing with Cognos or
Data warehousing with Data Stage or
Data warehousing with MSTR or
Data warehousing with Erwin or
Data warehousing with oracle.
Please suggest me which best to choose and which have more scope because I don't know the ABC of data warehousing but I have some experience in oracle.
Is it must that I need work experience in data warehousing then only can get a job ?Please tell me which is the best book for data warehousing which should start from scratch. Please give your suggestions about to my queries.
Thanks & Regards,
Raji

Hi,
Basically Datawarehouse is a concept.To develop DW , we need two tools mainly. One is ETL tool and other one is Reporting tool .
The few famous ETL tools are
Informatica
Data Stage
Few famous Reporting tools are
Crystal Reports
Cognos
Business object
As a DW developer you should aware of atleat one ETL tool and atleat one Reporting tool.The combination is your choice.It better to finout the best combination in point of job market , and then learn them.
Erwin is Datamodel tool. It can aslo be used in DW implementation. You have already have experience on ORacle,So my adivce is go for Data warehousing with oracle or Data warehousing with Informatica .And learn one reporting tool.I donot is there any reporting tool available from ORACLE.
My suggestion on books.
Fundamentals of Datawarehouse by PaulRaj Ponnai and
Datawarehouse toolkit.
http://www.inmoncif.com/about.html is one of the best site for Datawarehouse.
With rgds,
Anil Kumar Sharma .P
Assigning points is the way to say thanks in SDN site.

Select option for date

i want give default values in select option for date (for a period)
I used
SELECT-OPTIONS y_s_mnth FOR y_v_dt_month default first to last OPTION BT.
first and last are dates.
I am getting error dialog box....specify ranges...
Please give sample code..

Hi Suhas,
I hope this code will help you. Reward me if it is helpful.
select-options : y_s_mnth FOR sy-datum.
initialization.
y_s_mnth-sign   = 'I'.
y_s_mnth-option = 'BT'.
y_s_mnth-low    = sy-datum - 30.    "first_day
y_s_mnth-high   = sy-datum.         "last_day
append y_s_mnth.
clear y_s_mnth.
Regards,
Sagar

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I want to play my movie on an HDTV from my laptop or USB drive. What is the best option for Publish+Share?
I don't need to preserve layers for future re-edits and smaller file size is better but not if it's at the expense of playback quality.
Should I choose Computer or Disk? Pros and cons?
Should I choose MPEG or AVCHD? Pros and cons?
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Seems like there are 4 "best options" - can anyone advise further?
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Frame Rate
Audio Setting
MPEG
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29.97
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MPEG
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29.97
MPEG, 384 kbps, 48 kHz, 16 bit, Stereo
AVCHD
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H.264 Blu-ray
1920 x 1080
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Dolby Digital, 192 kbps, 48 kHz
AVCHD
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1920 x 1080
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SAP Best Practices for Data Migration :repositories only on MS SQL Server ?

Hi,
I'm implementing the "SAP Best Practices for Data Migration" (see https://websmp109.sap-ag.de/bp-datamigration).
As part of the installation you have to install MS SQL Server Express Edition. The installation guide contains detailed steps to do this. All repositories for Data Services should be running on SQL Server, according to the installation guide.
The customer I'm working for now does not want to use SQL Server, but DB2, as company standard.
So I use DB2 for the local and profiler repositories.
I notice however that the web application http://localhost:8080/MigrationServices does not support DB2.The only database type you can select in the configuration area is MS SQL Server.
Is this a limitation, a by design ?

Hans,
The current release of SAP Best Practices for Data Migration, v1.32, supports only MS SQL Server. The intent when developing the DM content was to quickly set up a temporary, standardized data migration environment, using tools that are available to everyone. SQL Server Express was chosen to host the repositories, because it is easy to set up and can be downloaded for free. Sone users have successfully deployed the content on Oracle XE, but as you have found, the MigrationServices web application works only with SQL Server.
The next release, including the web app, will support SQL Server and Oracle, but not DB2.
Paul

Best option for upgrading to CS 6

Hello,
I need some help. I currently have CS 5 and 5.5 installed across 7 PCs and 1 MAC within the marketing department in my company. What would be the best option for upgrading all of them to CS 6 Master Collection. (how many PCs can I use a license on? How many licenses would I have to purchase to install on all the machines?)
Thanks.

There is no ambiguity here: You buy 7+1 licenses. Though you have 2 activations per license, they are not meant to run your facility on the cheap. I suggest you read the EULA....
Mylenium

Best practices for data migration

Hi All,
This thread is useful for those who can use their opportunity to share the ideas and knowledge for making better and best use of data migration using Business Objects Data Services.

Hans,
The current release of SAP Best Practices for Data Migration, v1.32, supports only MS SQL Server. The intent when developing the DM content was to quickly set up a temporary, standardized data migration environment, using tools that are available to everyone. SQL Server Express was chosen to host the repositories, because it is easy to set up and can be downloaded for free. Sone users have successfully deployed the content on Oracle XE, but as you have found, the MigrationServices web application works only with SQL Server.
The next release, including the web app, will support SQL Server and Oracle, but not DB2.
Paul

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