Is RAID 5 not recommended for Oracle database ?

- I am planning to install Oracle database
Here are the specs:
- Dell PowerEdge T610 server
- Windows 2008 R2 (64-bit )
- 24 GB memory
- Oracle 10g database (64-bit database)
- Our database is for an ERP based client server application
- Will have around 35-45 users
- Will have around 150-200 transaction per day ( 8AM-5PM) only database
- database would be around 10-15GB (data files)
Now I am planning to buy the hardware server, I heard that RAID 5 is not recommended for Oracle database.
Is it true ?
What do you recommended for Oracle database ? RAID 5 (or) RAID 1

johnpau2013 wrote:
I heard that RAID 5 is not recommended for Oracle database.
Is it true ?Kind off... as Oracle (as per the RAC Starter Kits for example) explicitly recommends SAME - as in Stripe And Mirror Everything.
This is a combination of RAID1 and RAID0.
However, you will also get whitepapers from storage vendors like EMC in partnership with Oracle, that explains how to configure and use RAID5 storage and how effective this is. And as some will tell you, RAID5 can work just fine with Oracle... and some others will grimace and tell you how bad an idea that is from personal experiences.
In a nutshell - RAID5 requires a parity calculation on each write. That is a very expensive overhead if that calculation impacts the fwrite() (file write) command of a process writing data to disk. It significantly slows down the write operation.
However, if that parity calculation is done asynchronously and does not effect the elapsed time for a fwrite(), then a fwrite() to RAID5 is as fast or as slow as it would be to RAID10 for example.
Unsure how many modern storage system supports off-loading the parity calculation and not impacting the write I/O call. This can be done using ASICs (Application Specific Integrated Circuits), specialised s/w on the storage server, etc.
Whatever you put in place - test the RAID config thoroughly up front and ensure that performance is up to specs. There's a utility called fio (<i>Flexible I./O</i>) written by a Linux kernel hacker that works for Oracle. It is an excellent utility to use to generate and test I/O - but it is Linux and Unix based.
Any specific reason using Windows? Linux is by far a more predominant 64bit operating system than Windows, and has significant higher market share in Oracle RDBMS than Windows. Given the fact that over 93% of the 500 fastest computer systems on this planet runs Linux, I'm always kind of amazed that some would still use Windows as a server-side o/s for Oracle.

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hi both,
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RAID5 for oracle database

Hi,
Can you please confirm if RAID5 configuration is suitable for oracle database,?database size:50Gb OS:HP/UX version:10gr2
Sincerely
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user8913464 wrote:
what is the impact of this heavy disk write penalty, let's say that each disk size is 300Gb and number of disks is 4,database size:50GbThat depends entirely on the I/O system and I/O fabric layer.
Newer systems can receive the RAID 5 write into memory cache on the storage system (no parity block calculation overhead, no parity block write overhead). It then does this (the parity "stuff') when flushing that memory buffer to disk. Kind of like an Oracle delayed block cleanout where the changer of block data does not pay the penalty for cleaning and writing the block.
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thank you for reading my post
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orafad was a faster typist than I.
Message was edited by:
Justin Cave

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Hi
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Abu Al MAmun,
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I did read the post on to how you have to install the current patch set for 11.2.
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How to set JDBC Data Sources in Oracle MapViewer for Oracle database 12c Release 1 (12.1.0.1)

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Hi,
I have a requirement to put together a Oracle SQL template to create re-usable DDL/DML Scripts for Oracle databases.
Only the Oracle DBA will be running the scripts so permissions is not an issue.
The workflow for any DDL is as follows:-
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First let me address your question. (This is the easy part.)
1. The existence of tables can be found in DBA_TABLES. Query it and and then use conditional logic and execute immediate to process the DDL.
2. The existence of table columns is found in DBA_TAB_COLUMNS. Query it and then conditionally execute your DDL. You can copy the "before picture" of the table using that same dba view, or even better, use DBMS_METADATA.
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Now, to the heart of the matter...
You think I did not understand your requirements?
Please be respectful of people's comments. Many of us are professionals with decades of experience working with databases and Oracle technology. We volunteer our valuable time and knowledge here for free. It is extremely common for someone to post what they feel is an easy SQL or PL/SQL question without stating the real goal--the business objective. Experienced people will spot that the "wrong question" has been asked, and then cut to the chase.
We have some good questions for you. Not questions we need answers from, but questions you need to ask yourself and your team. You need to reexamine this post and deduce what those questions are. But I'll give you some hints: Why do you need to do what you are asking? And will this construct you are asking for even solve the root cause of your problems?
Then ponder the following quotations about asking the right question:
Good questions outrank easy answers.
— Paul Samuelson
The only interesting answers are those which destroy the questions.
— Susan Sontag
The scientific mind does not so much provide the right answers as ask the right questions.
— Claude Levi-Strauss
You can tell whether a man is clever by his answers. You can tell whether a man is wise by his questions.
— Mahfouz Naguib
One hears only those questions for which one is able to find answers.
— Friedrich Nietzsche
Be patient towards all that is unresolved in your heart and try to love the questions themselves.
— Rainer Maria Rilke
What people think of as the moment of discovery is really the discovery of the question.
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Judge a man by his questions rather than his answers.
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Hi All,
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EdStevens wrote:
Justin Mungal wrote:
EdStevens wrote:
user1970505 wrote:
Hi All,
I need a server sizing for the below mentioned architecture:
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1. Application server: Windows server 2008 R2
2. Database Server: Windows server 2008 R2, Oracle 11g r2
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Thanks........I'd seriously reconsider hosting Oracle db on Windows. Obviously there are many, many shops that do. And obviously it is often a case of the fact that they do not have (and choose to not acquire) expertise in Linux. But I've been in IT for 30+ years and have worked on IBM S-370 and its variants and descendents, Windows since v3, DEC VMS, IBM OS/2, Solaris, AIX, HPUX, and Oracle Linux. The first Oracle database I ever created was on Windows 3.11 and at that point I had never seen *nix. Now I am in a position to state that Windows is the worst excuse of an operating system of any I have ever used. I am constantly amazed/amused by how often (at least once a month on schedule, plus unplanned times) that our Windows SA has to send out a notice that he is re-booting his servers. I can't remember the last time we had to reboot a Linux server ( I have 4 of them)
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I haven't been working in IT for as long as many of the folks around here, only about 10 years. I'm a former system admin that maintained both Linux and Windows servers, but my focus was on Windows. In the right hands, Windows can be rock solid. If a system admin has to reboot Windows servers often, he is most likely doing something wrong, or is rebooting for security updates. It's never as simple as "Windows Sucks," or "Linux Sucks;" it all depends on who's running the system (again, in my opinion).
I have seen some windows servers run uninterrupted for so long no one could remember the admin password. But more often memory leaks and the "weekly update" (replacing last weeks bugs with this weeks) is the culprit.
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Installing Oracle Application Server 10.2 for Oracle Database Lite

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Install with the base, do not select any other options. Only choose webcache if you require the use of a software load balancer.

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But when you login all reports is showing errors bellow
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[nQSError: 43119] Query Failed:
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if this doesn't work check your credentials.
mark if this helps

Solaris 10 patches for Oracle Database 11gR2

Hi,
I downloaded Oracle Solaris 10 s/w from e-Delivery and got it installed. For Oracle Database 11gR2 I also need the followging patches:
120754-06: SunOS 5.10_x86 libmtsk
119961-05: SunOS 5.10_x86: Assembler
119964-14: SunOS 5.10_x86 Shared library patch for C++_x86
Though we have access to MyOracleSupport we can only download s/w patches using our support contract with Oracle and not OS patches.
Is there any other way I can get these patches.
Rgds,
Thiru.

Thiru,
You won't find the patches in the patches/ directory on the DVD or the ISO image. Oracle integrates the patches directly into the packages, so there is no need to provide or install them separately.
All patches have a patch number (e.g. 120754) and a revision (e.g. 06). A newer revision of a patch always contains all fixes of the previous revisions. So try to run "showrev -p | grep 120754" instead, and you'll see that patch 120754-08 is pre-installed. As revision 08 is newer/higher than 06, the patch requirement is satisfied.
Hope that helps,
mp.

Compression for oracle database and index compression during import of data

Hi All,
I have a query , in order to import into oracle database and also have compression and index compression , do we have some kind of load args for r3load and also do we have to change the tpl file ?

Hello guy,
I did this kind of compression within migration project before.
I performed index compress first and then export -> import with table compress.
One thing you should take care, delete nocompress flag from TARGET.SQL (created by program SMIGR_CREATE_DDL, program SMIGR_CREATE_DDL created pure non-compression objects for these considered non-standard tables). For table columns > 255, we should not delete this flag.
Regarding to the index compress in source system, please check the following notes:
Note 1464156 - Support for index compression in BRSPACE 7.20
Note 1109743 - Use of Index Key Compression for Oracle Databases
Note 682926 - Composite SAP note: Problems with "create/rebuild index"
Best Regards,
Ning Tong

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