Newbie Question - Live Data
Hi All,
I am very new to the world of BI but have been programming with MS SQL Server and Crystal Reports for the past 15 years. I'm looking into SQL BI to replace our Crystal Reports suite and provide additional reporting functionality such
as drilldown capability and allowing users to edit/build their own reports. Some reports will require drilldown functionality and some do not, also, some reports require live data and others do not. A live data report might
include employee time punches, or an open orders report run at the end of the day.
To build drilldown reports, I understand that I must create data cubes which require Dimension and Fact tables that are generally populated by a data warehousing process using SSIS. In doing that, I no longer have live
data and the warehouse tables must be updated at some point.
I believe that if the report does not require drill-down functionality, you don't have to create a cube and can therefore connect directly to the live data.
What are the generally accepted practices for these scenarios? Should I build reports directly against a live system in SQL reports? If not, how would I go about updating the warehouse tables as needed?
Am I correct about the usage of the Dimension and Fact tables? Do they have to be based on a data warehouse? Could a cube pull data from a live table?
I really want to implement BI correctly, so this information would be of great help to me.
Thanks
There is a Myth that Business Intelligence (which includes Analysis Services) replaces current reporting in systems. This is not the case even though people are trying to do it or being “told” to do it in their current environment.
My suggestion is let’s separate analysis of data from real-time reporting. Analysis might include show a trend of Employee Turnover in the last 5 years to see if there is a growing problem. Real-Time reporting might be can get a list of new employees
in the last 3 months that have not finished all required training.
The real-time data can be updated by the employee today, and then re-reported the same day. The analysis of data would be run once a month lagging the end month of the report to 2 months prior to current month because
data is not completed.
Now to answer your questions:
1. What are the generally accepted practices for these scenarios? Should I build reports directly
against a live system in SQL reports? If not, how would I go about updating the warehouse tables as needed?
--> If you want to build the data warehouse to do the analysis type (Business Intelligence) reporting,
you will want to do it according to Best Practices in the community and Dimensions and Facts (Kimball Methodology) is a standard that holds up very well with Analysis Service cubes, even though there are other options - Data Vault or Inmon methods. Reports
in this scenario should not be against live data. SSIS is the Microsoft tool for ETL (Extract, Transform and Load) into a Data Warehouse.
You should only build those types of reports against real-time data as the example above with current employees.
2. Am
I correct about the usage of the Dimension and Fact tables? Do they have to be based on a data warehouse? Could a cube pull data from a live table?
-->Yes, you are correct, Yes it is best in a data warehouse and yes a cube can pull live data. BUT,
to pull live data, the cube would have to be what is called ROLAP connected and direct queries would run against Live Data and can cause headaches (blocking, long running) in the transaction system. A company I worked for in the past had a replicated database
for real-time reporting that was 2-15 seconds behind the transaction system and it worked well. But, not with a cube running on top of it. Dimensions and Facts are best for a cube.
Hope this helps.
http://www.kimballgroup.com/
http://www.inmon.com/
https://www.youtube.com/user/DataVaultAcademy
Thomas
TheSmilingDBA Thomas LeBlanc MCITP 2008 DBA
Similar Messages
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Newbie question: Send data to printer from ABAP program
Hello, I am a newbie.
I do not use SAPScript nor SmartForms.
But I need to send a printer command stream from my ABAP to printer.
Is it possible?
How can this be possible? Please give me some guideline.
I will reward you points. Promise.
Thankshi,
u can send ur program details to printer using submit to sap-spool statement.
SUBMIT TO SAP-SPOOL
Basic form
SUBMIT rep ... TO SAP-SPOOL.
Extras:
1.... DESTINATION dest ... COPIES cop
... LIST NAME name
... LIST DATASET dsn
... COVER TEXT text
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... LINE-COUNT lin
... LINE-SIZE col
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... DEPARTMENT dep
... ARCHIVE MODE armode
... ARCHIVE PARAMETERS arparams
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2. ... SPOOL PARAMETERS params
... ARCHIVE PARAMETERS arparams
... WITHOUT SPOOL DYNPRO
3. ... Further parameters (for passing variants)
are described in the documentation for SUBMIT
The syntax check performed in an ABAP Objects context is stricter than in other ABAP areas. See Missing print parameters with SUBMIT.
Effect
Calls the report rep with list output to the SAP spool database.
Additions
... DESTINATION dest(output device)
... COPIES cop(number of copies)
... LIST NAME name(name of list)
... LIST DATASET dsn(name of spool dataset)
... COVER TEXT text(title of spool request)
... LIST AUTHORITY auth(authorization for display)
... IMMEDIATELY flag(print immediately ?)
... KEEP IN SPOOL flag(keep list after print ?)
... NEW LIST IDENTIFICATION flag(new spool request ?)
... DATASET EXPIRATION days(number of days list
retained)
... LINE-COUNT lin ( lin lines per page)
... LINE-SIZE col(col columns per line)
... LAYOUT layout(print format)
... SAP COVER PAGE mode(SAP cover sheet ?)
... COVER PAGE flag(selection cover sheet ?)
... RECEIVER rec(SAP user name of
recipient)
... DEPARTMENT dep(name of department)
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... ARCHIVE PARAMETERS arparams(structure with archiving
parameters)
... WITHOUT SPOOL DYNPRO(skip print control screen)
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' ' : Do not output cover sheet
'X' : Output cover sheet
'D' : Cover sheet output according to printer setting
armode with ARCHIVE MODE can accept the values '1', '2' and '3'. These values have the following meaning:
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'2' : Archive only
'3' : Print and archive
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Effect
Output is to the SAP spool database with the specified parameters. If you omit one of the parameters, the system uses a default value. Before output to the spool, you normally see a screen where you can enter and/or modify the spool parameters. However, you can suppress this screen with the following statement:
... TO SAP-SPOOL WITHOUT SPOOL DYNPRO
You could use this option if all the spool parameters have already been set!
Note
When specifying the LINE-SIZE, you should not give any value > 132 because most printers cannot print wider lists.
Addition 2
... SPOOL PARAMETERS params(structure with print
parameters)
... ARCHIVE PARAMETERS arparams(Structure with archive
parameters)
... WITHOUT SPOOL DYNPRO(skip print parameters
screen)
Effect
Output is to the SAP spool database with the specified parameters. The print parameters are passed by the field string params which must have the structure of PRI_PARAMS. The field string can be filled and modified with the function module GET_PRINT_PARAMETERS. The specification arparams with ARCHIVE PARAMETERS must have the structure of ARC_PARAMS. This parameter should only be processed with the function module GET_PRINT_PARAMETERS. Before output to the spool, you normally see a screen where you can enter and/or modify the spool parameters. However, you can suppress this screen with the following statement:
... WITHOUT SPOOL DYNPRO
Example
Without archiving
DATA: PARAMS LIKE PRI_PARAMS,
DAYS(1) TYPE N VALUE 2,
COUNT(3) TYPE N VALUE 1,
VALID TYPE C.
CALL FUNCTION 'GET_PRINT_PARAMETERS'
EXPORTING DESTINATION = 'LT50'
COPIES = COUNT
LIST_NAME = 'TEST'
LIST_TEXT = 'SUBMIT ... TO SAP-SPOOL'
IMMEDIATELY = 'X'
RELEASE = 'X'
NEW_LIST_ID = 'X'
EXPIRATION = DAYS
LINE_SIZE = 79
LINE_COUNT = 23
LAYOUT = 'X_PAPER'
SAP_COVER_PAGE = 'X'
COVER_PAGE = 'X'
RECEIVER = 'SAP*'
DEPARTMENT = 'System'
NO_DIALOG = ' '
IMPORTING OUT_PARAMETERS = PARAMS
VALID = VALID.
IF VALID <> SPACE.
SUBMIT RSTEST00 TO SAP-SPOOL
SPOOL PARAMETERS PARAMS
WITHOUT SPOOL DYNPRO.
ENDIF.
Example
With archiving
DATA: PARAMS LIKE PRI_PARAMS,
ARPARAMS LIKE ARC_PARAMS,
DAYS(1) TYPE N VALUE 2,
COUNT(3) TYPE N VALUE 1,
VALID TYPE C.
CALL FUNCTION 'GET_PRINT_PARAMETERS'
EXPORTING DESTINATION = 'LT50'
COPIES = COUNT
LIST_NAME = 'TEST'
LIST_TEXT = 'SUBMIT ... TO SAP-SPOOL'
IMMEDIATELY = 'X'
RELEASE = 'X'
NEW_LIST_ID = 'X'
EXPIRATION = DAYS
LINE_SIZE = 79
LINE_COUNT = 23
LAYOUT = 'X_PAPER'
SAP_COVER_PAGE = 'X'
COVER_PAGE = 'X'
RECEIVER = 'SAP*'
DEPARTMENT = 'System'
SAP_OBJECT = 'RS'
AR_OBJECT = 'TEST'
ARCHIVE_ID = 'XX'
ARCHIVE_INFO = 'III'
ARCHIVE_TEXT = 'Description'
NO_DIALOG = ' '
IMPORTING OUT_PARAMETERS = PARAMS
OUT_ARCHIVE_PARAMETERS = ARPARAMS
VALID = VALID.
IF VALID <> SPACE.
SUBMIT RSTEST00 TO SAP-SPOOL
SPOOL PARAMETERS PARAMS
ARCHIVE PARAMETERS ARPARAMS
WITHOUT SPOOL DYNPRO.
ENDIF. -
Newbie question saving data to a VO
I have a datagrid with a list of files. I'd like the user to be able to select one or more files and add text/data in a form. On a click event I'd like to save the form data and to a VO for the selected file. Eventually I'll pass the an array of AssetVOs to a BlazeDS service.
Here's my VO:
package com.example.vo
public class AssetVO
public var fileName: String;
public var fileSize: String;
public var assetType: String;
public var assetTags: Array;
public var assetName: String;
public var assetDescription: String;
public var readyForReview: Boolean;
public function AssetVO()
What's the simplest way to accomplish this task?
ThanksI have a datagrid with a list of files. I'd like the user to be able to select one or more files and add text/data in a form. On a click event I'd like to save the form data and to a VO for the selected file. Eventually I'll pass the an array of AssetVOs to a BlazeDS service.
Here's my VO:
package com.example.vo
public class AssetVO
public var fileName: String;
public var fileSize: String;
public var assetType: String;
public var assetTags: Array;
public var assetName: String;
public var assetDescription: String;
public var readyForReview: Boolean;
public function AssetVO()
What's the simplest way to accomplish this task?
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Newbie Question: How much computer do I need?
Newbie Question:
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I have an external DVD writer on my iMac.
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GeekyBoyNow how do I make a data CD and
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InDesign or Acrobat (newbie question)
Hi,
I tried posting this in the LiveCycle Designer forum, but I think it's a bit too much of a newbie question:
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You can (I said I was oversimplifying). However there are contractual
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>Which would be preferable -- receiving form data from LiveCycle or Acrobat?
It depends what you want to do.
>
>I wish I knew what the difference was between these two programs. Is it purely a matter of emphasis on one task or another?
They come to the same problem in different ways. For a simple task
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Aandi Inston -
2 newbies question about diskgroups
Hi gurus,
I have 2 newbies question:
Im working in a RAC Database (11.2.0.3) on Redhat 5.3 with some disk groups. One of this groups have 6 disks on it with different space (134, 236G, 236G, 185G, 185G and 185G).
My questions are:
1) What would be happend when the lower space disk will be full?
2) At this moment the diskgroups are at 45% so i was thinking to change their spaces to have all with the same space (around 193G each), it would create any problem? i should restart database or can do it with database up?
Thanksif a disk is filled, what would happen? could i resize the disks with same size without stop database and without affecting the data stored within each disc?
By the word 'disk' I assume you mean LUN . When a LUN in a disk group is filled, ASM will use the remaining LUNs to store the data. You should always use LUNs of uniform size to avoid uneven I/O .
could i resize the disks with same size without stop database and without affecting the data stored within each disc
You can get the Unix/Storage team to allocate more LUNs for this Server. Once these LUNs are added , check if the following pre-reqs are met for the LUN which is yet to be added to the disk group
v$asm_disk.HEADER_STATUS = 'CANDIDATE'
v$asm_disk.PATH = /dev/rdsk/youLUNname
v$asm_disk.NAME will be NULL
Now you can add the LUNs using
alter diskgroup DATA_DG01 add disk '/dev/rdsk/youLUNname' rebalance power 4 ; wait for rebalance to finish (check status in V$ASM_OPERATION)
Yes. The above can be done without stopping the DB. It won't affect the stored data either. -
Two newbie questions:
1. I have a simple batch file as below that I execute using ifsshell.
login system/manager
cd /FolderSystem
put /usr/local/oracle/testifs/test.txt
logout
How do I copy to iFS all files in a specified local directory - /usr/local/oracle/testifs/* doesn't seem to work.
2. Can database user be mapped to iFS user?
Thanks in advance,
Anandhixsi wrote:
- Is there a way to display X-Axis labels vertically in a chart?
See Badunit's reply below.
- Is there a way to display only specific values in a line chart?
You can create a chart from "all the data in a table or only data in selected cells of one or more tables," according to the Numbers '09 Users Guide. Rather than reinvent the wheel, I'll refer you to Chapter 7 of that document, and specifically to Page 132.
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Regards,
Barry
Message was edited by: Barry -
I have the new Cisco RV042G router, and I have just a few "newbie questions" about it as I get started using it:
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I also want to setup a VLAN on a port for guests to access the Internet, but not have any access to my personal network. Here's the steps I've done so far. Is this sufficient or is there anything else I need to do?
I went to Setup>Network, enabled Multiple Subnets.
I added 192.168.254.1/255.255.255.0 as a subnet.
I went to Port Management>Port Setup, set the port I wanted to use (Port 4) to VLAN2.
I went to Firewall>Access Rules, added two rules:
Deny All Traffic from 192.168.254.0 to 192.168.1.0.
Deny All Traffic from 192.168.1.0 to 192.168.1.0.
Thanks everyone for your help!Easy. just goto the DHCP field and fill in the Static DHCP fields.
Assigning static IP addresses by adding devices from a list
Click Show unknown MAC addresses. The IP & MAC binding list appears. If the web browser displays a message about the pop-up window, allow the blocked content.
The devices are listed by the IP address and the MAC address. (Typically the MAC address appears on a label on the bottom panel or back panel of a device.) If needed, you can clickRefresh to update the data.To select a device, first enter a descriptive Name. Then check the Enable box. Alternatively, select all devices in the list by clicking the check box at the top of the Enable column.
Click OK to add the devices to the Static IP list, or click Close to close the pop-up window without adding the selected devices. After you click OK, a message appears. The message includes important information. Read it before clicking OK. Keep the browser open and wait until the selected MAC addresses appear in the Static IP list.
Modify or remove list entries, as needed:
To modify the settings: Click a device in the list. The information appears in the text fields. Make the changes, and then click Update. If you do not need to make changes, you can click Add New to de-select the entry and clear the text fields.
To delete an entry from the list: Click the entry that you want to delete, and then clickDelete. To select a block of entries, click the first entry, hold down the Shift key, and then click the final entry in the block. To select individual entries, press the Ctrl key while clicking each entry. To de-select an entry, press the Ctrl key while clicking the entry.
Assigning static IP addresses by entering devices manuallyIn the Static IP Address section, add or edit entries as needed. Remember that the settings are not saved until you click the Save button.
To add a new device to the list: Enter the following information, and then click Add to list.
Static IP Address: Enter the static IP address. You can enter 0.0.0.0 if you want the router to assign a static IP address to the device.
MAC Address: Enter the MAC address of the device. (Typically the MAC address appears on a label on the bottom panel or the back panel of a device.) Enter the address without punctuation.
Name: Enter a descriptive name for the device.
Enable: Check this box to assign the static IP address to this device.
To add another new entry: Enter the information, and then click Add to list.
To modify the settings: Click a device in the list. The information appears in the text fields. Make the changes, and then click Update. If you do not need to make changes, you can clickAdd New to de-select the entry and clear the text fields.
To delete an entry from the list: Click the entry that you want to delete, and then click Delete. To select a block of entries, click the first entry, hold down the Shift key, and then click the final entry in the block. To select individual entries, press the Ctrl key while clicking each entry. To de-select an entry, press the Ctrl key while clicking the entry.
Using the Static IP List to Block Devices
You can use the Static IP list to control access to your network. You can block access by devices that are not on the list or do not have the correct IP address.
Add devices to the Static IP list as described in Static IP Addresses.
Enable or disable the following features:
Block MAC address on the list with wrong IP address: Check this box to prevent a computer from accessing your network if its IP address has been changed. For example, if you previously assigned a static IP address of 192.168.1.100 and someone configures the device to use 192.168.149, the device will not be allowed to connect to your network. This feature discourages users from changing their device IP addresses without your permission. Uncheck the box to allow access regardless of the current IP address assignment.
Block MAC address not on the list: Check this box to block access from devices that are not included in the Static IP list. This feature prevents unknown devices from accessing your network. Uncheck the box to allow access by any connected device that is configured with an IP address in the correct range.
Hope that helps.
Regards Simon
http://www.linksysinfo.org -
I am trying to view MS Access database records in a jsp page
using Dreamweaver 8.0.2 (as part of the Cafe Townsend tutorial)
In the Databases panel I can see the database objects. The
test to database connection successfuly returns database records.
However, when I click on LIVE DATA VIEW icon, a red exclamation
mark(!) appears next to the Recordset(rs_Comment) #prior version#
line of the Server Behaviors tab.
When I select this line and double-click a message box
saying: "This server behavior was created with a prior version of
UltraDev. It will be replaced with the current version when you
click OK in the server behavior dialog box." appears. I hit OK in
the box, and hit OK in the Recordset dialog box that also appears.
The exclamation marked line disappears from the Server Behavior
tabbed pane, but the problem remains unsolved.
I uninstalled and reinstalled DW8, but the problem persists.
Any help would be appreciated."RogerLH" <[email protected]> wrote in
message
news:fgnke1$qqi$[email protected]..
> I am trying to view MS Access database records in a jsp
page using
> Dreamweaver
> 8.0.2 (as part of the Cafe Townsend tutorial)
>
> In the Databases panel I can see the database objects.
The test to
> database
> connection successfuly returns database records.
However, when I click on
> LIVE
> DATA VIEW icon, a red exclamation mark(!) appears next
to the
> Recordset(rs_Comment) #prior version# line of the Server
Behaviors tab.
>
> When I select this line and double-click a message box
saying: "This
> server
> behavior was created with a prior version of UltraDev.
It will be replaced
> with
> the current version when you click OK in the server
behavior dialog box."
> appears. I hit OK in the box, and hit OK in the
Recordset dialog box that
> also
> appears. The exclamation marked line disappears from the
Server Behavior
> tabbed
> pane, but the problem remains unsolved.
>
> I uninstalled and reinstalled DW8, but the problem
persists.
>
> Any help would be appreciated.
Does the code get changed in any way, or does the code stay
exactly the same
and is dreamweaver somehow not recognizing it anymore?
Joris -
Can't View Live Data in DW8 Tutorial
I am trying to view MS Access database records in a jsp page
using Dreamweaver 8.0.2 (as part of the Cafe Townsend tutorial)
In the Databases panel I can see the database objects. The
test to database connection successfuly returns database records.
However, when I click on LIVE DATA VIEW icon, a red exclamation
mark(!) appears next to the Recordset(rs_Comment) #prior version#
line of the Server Behaviors tab.
When I select this line and double-click a message box
saying: "This server behavior was created with a prior version of
UltraDev. It will be replaced with the current version when you
click OK in the server behavior dialog box." appears. I hit OK in
the box, and hit OK in the Recordset dialog box that also appears.
The exclamation marked line disappears from the Server Behavior
tabbed pane, but the problem remains unsolved.
I uninstalled and reinstalled DW8, but the problem persists.
Any help would be appreciated.quote:
Originally posted by:
RogerLH
I am trying to view MS Access database records in a jsp page
using Dreamweaver 8.0.2 (as part of the Cafe Townsend tutorial)
In the Databases panel I can see the database objects. The
test to database connection successfuly returns database records.
However, when I click on LIVE DATA VIEW icon, a red exclamation
mark(!) appears next to the Recordset(rs_Comment) #prior version#
line of the Server Behaviors tab.
When I select this line and double-click a message box
saying: "This server behavior was created with a prior version of
UltraDev. It will be replaced with the current version when you
click OK in the server behavior dialog box." appears. I hit OK in
the box, and hit OK in the Recordset dialog box that also appears.
The exclamation marked line disappears from the Server Behavior
tabbed pane, but the problem remains unsolved.
I installed and reinstalled DW8, but the problem persists.
Any help would be appreciated.
I'm new to the Forum and DW I need some help saving a file
and then opening back up in the interface lol -
Unable to see live data view for a access db
I'm using the following:
Asp.net C#
Server 2003 Sp2/
DW CS3
Access db
I'm attempting to connect to a "local" db on my server.
I use the database connection string"
Provider=Microsoft.Jet.OLEDB.4.0;
Data Source=C:\catalog\Catalog\files.mdb;
Persist Security Info=False
ole db connection
While in the data link properties window the connection is
successful but in the ole db connection window I get "An
unidentified error has occurred".
If I just press ok I'm unable to see any of the table in my
db.
All I want to do is setup the Live Data view
Thanks in advance for all your help."madhooper" <[email protected]> wrote in
message
news:fcc6vt$jd6$[email protected]..
>
>
> I'm using the following:
>
> Asp.net C#
> Server 2003 Sp2/
> DW CS3
> Access db
>
> I'm attempting to connect to a "local" db on my server.
> I use the database connection string"
>
> Provider=Microsoft.Jet.OLEDB.4.0;
> Data Source=C:\catalog\Catalog\files.mdb;
> Persist Security Info=False
> ole db connection
>
> While in the data link properties window the connection
is successful but
> in
> the ole db connection window I get "An unidentified
error has occurred".
>
> If I just press ok I'm unable to see any of the table in
my db.
>
> All I want to do is setup the Live Data view
>
> Thanks in advance for all your help.
Did you configure your testing server?
Set up a testing server
http://livedocs.adobe.com/en_US/Dreamweaver/9.0/WSc78c5058ca073340dcda9110b1f693f21-79e0.h tml
Preparing to build dynamic sites
http://livedocs.adobe.com/en_US/Dreamweaver/9.0/WSc78c5058ca073340dcda9110b1f693f21-7a31.h tml -
Basic questions on data modeling
Hi experts,
I have some basic questions regarding data modeling within MDM. I understand the available table types and the concept of lookup fields. I know that the MDM data modeling concept is different to the relational concept. But having a strong database background my first step was to design a relational data model which I would like to transfer to a MDM repository. Unfortunately I didn't found good information material on this. So here are some questions maybe you can help me:
1) Is it the right approach to model n:m relationships with multivalued lookup fields? E.g. main table Users with lookup field from subtable SapAccounts (a user can have accounts in different SAP systems, that means more than one account).
2) Has a record always be unique in MDM repositories (e.g. should we use Auto ID's in every table or do we have to mark a combination of fields as unique)? Is a composite key of 2 or more fields represented with marking these fields as unique?
3) The concept of relationships in MDM is only based on relationships between single records (not valid for all records in a table)? Is it necessary to define all relationships similar to the relational data model in MDM? Is there something similar to referential integrity in MDM?
4) Is it possible to change the main table to a sub table later on if we realize that it has also to be used as a lookup table for another table (when extending the data model) or do we have to create a new repository from scratch?
Thank you for your answers.
Regards, bdYes you are correct. It is almost difficult to map relational database to mdm one. But again MDM is not 'just' a database. It holds much more 'master' information as compared to any relational db.
1) Is it the right approach to model n:m relationships with multivalued lookup fields? E.g. main table Users with lookup field from subtable SapAccounts (a user can have accounts in different SAP systems, that means more than one account).
Yes Here you need to use MV look up tables or can also try Qualifier tables if it gets more complex
2) Has a record always be unique in MDM repositories (e.g. should we use Auto ID's in every table or do we have to mark a combination of fields as unique)? Is a composite key of 2 or more fields represented with marking these fields as unique?
Concept of uniqueness differs here that you also have something called Display Fields (DF). A combination of DF can also be treated as Unique one. For instance while importing records if you select these DF as a combination, you will eliminate any possible of duplicates based on this combination. Auto Id is one of the ways to have a unique id once record is within MDM. While you use UF or DF to eliminate any possible duplicates at import level
3) The concept of relationships in MDM is only based on relationships between single records (not valid for all records in a table)? Is it necessary to define all relationships similar to the relational data model in MDM? Is there something similar to referential integrity in MDM?
Hmm... good one. Referencial Integrity. What I assume you are talking is that if you have relationships between tables then removing a record will not be possible as it is a foreign key for some record. Here MDM does not allow that. As Relationships within MDM are physical and not conceptual. For instance material can have components. Now if material does not exist then any relationship to components is not worthwile to maintain. Hence relationshsip is eliminated. While in relational model relationships are more conceptual. Hence with MDM usage of lookups and main table you do not need to maintain these kind of relationships on your own.
4) Is it possible to change the main table to a sub table later on if we realize that it has also to be used as a lookup table for another table (when extending the data model) or do we have to create a new repository from scratch?
No. It is not possible to convert main table. There is only one main table and it cannot be changed.
I went for the same option but it did not work. What I suggest is to look up your legacy system one by one and see what fields in general can be classified as Master, Reference, Transactional - You will start getting answers immediately.
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