Basic question on RAC in Dataguard

RDBMS version : 10GR2
If my Primary DB is in RAC , should my Standby DB (Physical or Logical) be in RAC as well ?

Although all combinations are technically possible:
1) RAC Primary & Single Instance Standby
2) Single Instance Primary & RAC Standby
3) RAC Primary & RAC Standby,
the most common case is indeed 3)
1) will be probably not used for DR but for Reporting only
2) will be used during Migration to RAC
typically.
Kind regards
Uwe Hesse
http://uhesse.wordpress.com

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RAC and dataguard

With reference to this thread
is Dataguard and standby dbs is HA
RAC and DATAGAURD are two different approches for high availability and desaster recovery.
We are planning to implememt RAC and DATAGAURD but there are budget issues also.
With RAC As i understand we have multiple instances governing a single database. So multiple node/machines governing a single database server.
With DATAGAURD,we have a DR solution at another location.If the primary server fails,standby database takes up the role of primary.
With RAC alone,if any node fails, there is another node to do instance recovery or the server still continues. But what if database server crashes. WIth RAC alone and no dataguard, won't it allow downtime?

Hi Hashmi,
RAC and DataGuard are indeed different things, as you understood.
Regarding your question, there is no database server, that's the whole thing. There is one database (which resides on external redundant storage like Netapp, EMC, etc.) and there are several servers that are running the instances. Downtime will occur only if the storage crashes. And if you don't trust your storage you can have ASM redundancy, so storage failure will not cause downtime as well.
The down side, is that there is one database, so if you have logical corruption, human error, or something similar you can loose data or have downtime.
However, the high availability is real.
In DataGuard, once the primary is down it takes some time (not long) to activate the standby, but it has a different IP, so you should configure your DNS/clients (in advance or at failover) to connect to the activated standby.
HTH
Liron Amitzi
Senior DBA consultant
[www.dbsnaps.com]

Tnsnames configuration for RAC and dataguard

Hi everyone,
I have an environment with RAC and dataguard (production is RAC, standby is single instance) and I was wondering what is the best way to configure the clients (since I have quite a few and I don't want to change their tnsnames if I need to failover to the standby database).
Now, I need to have both RAC nodes of course, the question is what I should do with the standby...
The problems are:
1. If I add the standby as another address, 1/3 of the connections will get to it and I don't think it's a good idea
2. I can disable the load_balance, but then all connections will go to the first node's listener
3. After a failover, if the RAC nodes are down, it will take a long time to connect (the servers will not respond and the client will wait for timeout if it tries to connect to the RAC nodes first, only after the timeout it will try the standby and succeed)
Any ideas and suggestions will be appreciated.
Thanks,
Liron

Hi Robert,
I agree that the standby should be up, but you have to admit that if it is down it should not delay connections to the primary...
About the DNS, it's not that I don't trust the SA, but this is an environment for a customer so it should be as independent as it can be. So the failover process will be easy and fast. I don't know if I can get DNS permissions, but that's a good idea...
A question that can be derived from this:
assuming that I use observer to have an automatic failover, how should I configure my TNS? If the standby will become the primary automatically, I have to configure the clients to connect to the activated standby automatically. With no DNS changes or anything manual.
I guess in this case, my best option will be with LOAD_BALANCE=off, some of the clients will have RAC-NODE1 as first address and some will have RAC-NODE2, the standby will be the last address and we'll suffer the timeout if the primary will be down when connecting to the activated standby.
If anyone has other ideas, it would be great.
Thanks,
Liron

Basic question

Hello, i have a basic question. if i have defined 2 fields in a cube or a dso:
Name Quantity
and from the external flat file i get some characters for my quantity field. would my load fail? for standard dso and for write optimized?
NOTE: quantity field is a keyfigure defined as numeric.
and the load coming in has "VIKPATEL" for Quantity field and not numbers.
thanks

Hi Vik,
Yes, the load will fail.
May be you coud first load this data into BW (into PSA) and set both fields as characters fields. Then you can create DSO, do transformation from this PSA to the DSO, and put your logic as to what do you want to do with those Quantity that is not number (e.g. convert to 0, or 'Not assgined', etc).
You can use transfer rule, or a clean up ABAP code in the start routine.
Hope this helps.

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I have a very very basic question, so excuse me for that... I just would like to know the difference ( and the difference in usage) between sql and pl/sql?
thank you
Yann

SQL - the structured query language - is the language available for extracting data from the database. It is a 4GL, and each command stands alone and performs a database action.
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SQL is capable of a LOT more than people usually realize. Unfortunate, as people often create PL/SQL programs when single SQL statements will do the job. I encourage reading the O'Reilly 'Mastering Oracle SQL' book ... only after fiunishing that book do I recommend any of Feuerstein's excellent PL/SQL books.

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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, bd

Yes 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.

HT1311 I know this is a basic question, however, how do i change my pass word on itunes to stop my kids from automatically buying tunes from the I store... as my card details are already saved they just log in with their ipods and download via my account

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http://support.apple.com/kb/HE36
Regards.

HT1848 Forgive such a basic question, it's easier than looking it up. I have my iTunes music on macbook pro and have only synced it to one iPod. I want to buy a new iPod and want to know will I be able to sync my music from computer to new iPod at no ch

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will I be able to sync my music from computer to new iPod at no charge?
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Basic question regarding SSIS 2010 Package where source is Microsoft Excel 97-2005 and there is no Microsoft office or Excel driver installed in Production

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I got one basic question regarding SSIS 2010 Package where source is Microsoft Excel 97-2005. I wanted to know How this package works in production where there is no Microsoft office or Excel driver installed. To check that there is excel driver installed
or not, I followed steps: Start-->Administrative Tools--> Data Sources(ODBC)-->Drivers and I found only 2 drivers one is SQL Server and another one is SQL Server Native Client 11.0.
Windows edition is Windows Server 2008 R2 Enterprise, Service Pack-1 and System type is 64-bit Operating System.
We are running this package from SQL Server Agent and using 32-bit (\\Machine_Name\d$\Program Files (x86)\Microsoft SQL Server\110\DTS\Binn\DTExec.exe /FILE "\\Machine_Name\d$\ Folder_Name\EtL.dtsx" /CONFIGFILE "\\Machine_Name\d$\Folder_Name\Config.dtsConfig"
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I discussed with my DBA and He said that SSIS is having inbuilt Excel driver but I am not convinced.
Could anyone please clear my confusion/doubt?
I have gone through various links but my doubt is still not clear.
Quick Reference:
SSIS in 32- and 64-bits
http://toddmcdermid.blogspot.com.au/2009/10/quick-reference-ssis-in-32-and-64-bits.html
Why do I get "product level is insufficient..." error when I run my SSIS package?
http://blogs.msdn.com/b/michen/archive/2006/11/11/ssis-product-level-is-insufficient.aspx
How to run SSIS Packages using 32-bit drivers on 64-bit machine
http://help.pragmaticworks.com/dtsxchange/scr/FAQ%20-%20How%20to%20run%20SSIS%20Packages%20using%2032bit%20drivers%20on%2064bit%20machine.htm
Troubleshooting OLE DB Provider Microsoft.ACE.OLEDB.12.0 is not registered Error when importing data from an Excel 2007 file to SQL Server 2008
http://www.mytechmantra.com/LearnSQLServer/Troubleshoot_OLE_DB_Provider_Error_P1.html
How Can I Get a List of the ODBC Drivers that are Installed on a Computer?
http://blogs.technet.com/b/heyscriptingguy/archive/2005/07/07/how-can-i-get-a-list-of-the-odbc-drivers-that-are-installed-on-a-computer.aspx
Thanks Shiven:) If Answer is Helpful, Please Vote

Hi S Kumar Dubey,
In SSIS, the Excel Source and Excel Destination natively use the Microsoft Jet 4.0 OLE DB Provider which is installed by SQL Server. The Microsoft Jet 4.0 OLE DB Provider deals with .xls files created by Excel 97-2003. To deal with .xlsx files created by
Excel 2007, we need the Microsoft ACE OLEDB Provider. SQL Server doesn’t install the Microsoft ACE OLEDB Provider, to get it we can install the
2007 Office System Driver: Data Connectivity Components or
Microsoft Access Database Engine 2010 Redistributable or Microsoft Office suit.
The drivers listed in the ODBC Data Source Administrator are ODBC drivers not OLEDB drivers, therefore, the Excel Source/Destination in SSIS won’t use the ODBC driver for Excel listed in it by default. On a 64-bit Windows platform, there are two versions
of ODBC Data Source Administrator. The 64-bit ODBC Data Source Administrator is C:\Windows\System32\odbcad32.exe, while the 32-bit one is C:\Windows\SysWOW64\odbcad32.exe. The original 32-bit and 64-bit ODBC drivers are installed by the Windows operating system.
By default, there are multiple 32-bit ODBC drivers and fewer 64-bit ODBC drivers installed on a 64-bit platform. To get more ODBC drivers, we can install the 2007 Office System Driver: Data Connectivity Components or Microsoft Access Database Engine 2010 Redistributable.
Besides, please note that 2007 Office System Driver: Data Connectivity Components only install 32-bit ODBC and OLEDB drivers because it only has 32-bit version, but the Microsoft Access Database Engine 2010 Redistributable has both 32- bit version and 64-bit
version.
If you have any questions, please feel free to ask.
Regards,
Mike Yin
TechNet Community Support

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Hi,
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Venkata Devaraj !!!

Basic Questions

Hi all,
I´ve some basic questions - we are seeking for an alternative for our MS Exchange System. So I need some more information before going to hot testing Oracle :-)
- Does Oracle Coll. support multiple Domains? Not only subdomains - either completley different Domains?
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A more technical question:
On my first testing (Solaris 10, Sparc) I run into a strange phaenomen - my FQDN hast an '-' interated and the installation process interpreted it as '_'? I mean I have read something about that but couldn´t find that in the doc. anymore. I think it is a big problem for sending mails if the system change my domain name from [email protected] to mail@fq_dn.com ... ;-)
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Hi Eisfalke!
Oracle Collaboration Suite supports multiple domains.
You will not create users with SQL but with some other commandline tools as their data goes into the OID and the CS database. But yes, it has tools for bulkcreation.
I have not yet had the pleasure of working with a domain with a - but you should be capable of creating a new domain with a dash and remove the domain with the underscore.
cu
Andreas

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Hi!
I have some very basic questions about compiling source on 10.6. BTW, if the unix discussions still exist, they've hidden them pretty well, so I hope I'm in the right place for this!
First off, you simply cd to the source dir, wherever it may be - in my case ~/Downloads/source/ - and during the install process, everything will be installed in its proper dir, right?
How do you know which compiler to use? There seem to be several: make, gmake, gcc, g++, etc...
Once you do figure out which compiler to run, the process is supposed to go like this, right?
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Xcode 3.2.4
Python 2.7

sudont wrote:
I have some very basic questions about compiling source on 10.6. BTW, if the unix discussions still exist, they've hidden them pretty well, so I hope I'm in the right place for this!
This is the place for UNIX discussions. If you have developer-related questions, there is a forum dedicated to that as well: Developer Forums
First off, you simply cd to the source dir, wherever it may be - in my case ~/Downloads/source/ - and during the install process, everything will be installed in its proper dir, right?
Yes. Hopefully the project you want to install follows standard conventions. If so, you can do "./configure", then "make", and finally "sudo make install" to install the software into "/usr/local".
How do you know which compiler to use? There seem to be several: make, gmake, gcc, g++, etc...
The make file will figure that stuff out.
Once you do figure out which compiler to run, the process is supposed to go like this, right?
./configure
make (or whatever)
make install
Yes, with the addition of "sudo" before "make install" because "/usr/local" is owned by root.
But this doesn't always work for me. For instance, I'm trying to compile 'arm', but it doesn't seem to have a 'configure' script.
$ ls ~/Downloads/arm
ChangeLog
README
armrc.sample
setup.py
LICENSE
arm
install
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I apologize for the basic nature of these questions, but the answers weren't obvious to me from the materials I was able to locate.
gba

sineadholly wrote:
Problem with speaker. I read you need to do a firmware update to get the speaker option on your product's menu so i've completely updated it, but still no option to switch speaker on, and won't just come on when i unplug the headphones, any ideas?
what exactly is the model of your Mozaic? Is it EZ 00, EZ 300 or plane ZEN Mozaic?

Basic question on RAC in Dataguard

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