Database Smart Flash Cache and Data Guard

We are on Oracle 11.2.0.2 on OEL 5 and our considering buying fusion io (PCIe flash drives) for our Production (Primary) database.
My question is; Can we use Physical Data Guard with the Primary side using Database Smart Flash Cache and keep-ing tables and/or partitions in the Flash Cache and have a Standby side that does not have Database Smart Flash Cache?

Yes you can.
Data Guard will not check what type drive you are using. As long as you meet the database and network requirements it will work.
http://www.oracle.com/technetwork/database/features/availability/maa-090890.html
Check out these white papers if you have concerns
"Migration to Automatic Storage Management (ASM)"
"Best Practices for Creating a Low-Cost Storage Grid for Oracle Databases"
In addition here's an example of using two different file systems with Data Guard
http://pythianpang.wordpress.com/2009/07/07/data-guard-asm-primary-to-filesystem-physical-standby-using-rman-duplicate/
Best Regards
mseberg

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Smart flash cache and Oracle Linux 6

I can't use smart flash cache feature on Oracle database 11.2.0.3.0 I installed on Oracle Linux 6.
I installed Oracle database 11.2.0.3.0 on Oracle Linux 6.1 and try to use smart flash cache feature,
I got this error when I start database:
ORA-00439: feature not enabled: Server Flash Cache
ORA-01078: failure in processing system parameters
My environment are:
OS: Oracle Linux 6.1 (x86_64)
Kernel: 2.6.32-100.34.1.el6uek.x86_64
DB: 11.2.0.3.0
Related parameter in pfile I used to start database to use smart flash cache feature,
*.db_flash_cache_file='/d09/db_flash_cache/db_flash_file.raw'
*.db_flash_cache_size=32G
I have accomplished this on Oracle database 11.2.0.2.0 on Oracle Linux 5.5 before, I don't think new version of database cause the issue but I'm not sure is there any smart flash cache issue with the Oracle Linux 6.1?
Note:
I need to use Oracle Linux 6.1 instead of Oracle Linux 6.2 and can't updated the kernel to UEK2 because the SSD PCI-E card only support on this distro and kernel version.
Edited by: Rapid E-Suite on Apr 16, 2012 11:22 AM

Hi;
Oracle Enterprise Linux was changed to Oracle Linux, isn't ?
Oracle stopped calling their Linux distro as "Oracle Enterprise Linux" since OEL5.5 or 5.6 (I'm not sure). Therefore, today there is Oracle Linux only? If so, I'm using OL6.1 also means OEL6.1, correct?
But, If the doc really means Oracle Enterprise Linux only then should it means OEL5.5 or 5.6?AFAIK both refer to Oracle Linux.If somebody mention they have OEL6.1 or Oracle linux 6.1 than I accept it Oracle linux(Enterprise)
You may see FAQ documents:
http://www.oracle.com/us/technologies/027617.pdf?ssSourceSiteId=ocomtr
If you have still dubt than I suggest rise thread at Forum Home » Linux » Oracle Linux forum part
Regard
Helios

Smart Flash Cache

Hi,
is the smart flash cache only available on sun oracle hardware ?
I know that this option is available only on OEL end Solaris, but I'n not sure on hardware ?
Thank a lot.

Hi;
Oracle Database Smart Flash Cache is a feature that was first introduced with Oracle Database 11g Release 2. Only available on Oracle Linux and Oracle Solaris, this feature increases the size of the database buffer cache without having to add RAM to the system. In effect, it acts as a second level cache on flash memory and will especially benefit read-intensive database applications.
Source:
http://blogs.oracle.com/linux/entry/oracle_database_smart_flash_cache_only_on_oracle_linux_and_oracle_solaris
Also see:
How To Size the Database Smart Flash Cache [ID 1317950.1]
Regard
Helios

Smart flash cache algorithm

I'd like to understand exactly how smart flash cache algorithm works.
I’ve read the Oracle white paper on smart flash cache. It says following:
Exadata Smart Flash Cache provides an automated caching mechanism for frequently-accessed data in the Exadata Database Machine.
What is the algorithm to figure out "frequently accessed data”?
It also say following -
The Oracle Database and Exadata Storage Server Software work closely together to cache frequently accessed data.
When the database sends a read or write request to Exadata Storage Server, it includes additional information in the request about whether the data is likely to be read again and therefore whether it should be cached.
Again what's the algorithm to figure out that data is likely to be read again?
Does it simply cache all random reads against tables and indexes and ignores all sequential reads, scans, writing backups and mirrored blocks?
I’ve also read that, Exadata tags each DB I/O is with metadata indicating I/O type which influence caching . Can somebody shed light on what are various I/O types and which ones are cached?

user12254641 wrote:
Thanks for your inputs.
I see it knows what not to cache.
However I was wondering if it has any special algorithm to decide frequently accessed data.
It seems it will cache all random read/writes and of course file headers and control files.There are really two parts to caching: 1) what to cache and 2) the management of cached data.
Assuming cell_flash_cache = default for these segments: index/table, any single block operation is cached. Also IIRC, multi-block reads (but not smart scan multi-block reads) are also cached, up until a certain size (64k or 128K are numbers that comes to mind, but I don't have the code open to check at this moment).
The cache management is basically LRU based, like the db buffer cache -- frequently accessed data is kept on the hot end, and data is aged out on the cold end and replaced.
While I'm sure "algorithms" are interesting for the geek in us, I 'm not sure how this info aids in any management or decision making. Questions are generally better formulated discussing what you would like to do so that appropriate advice can be given. You're question is context free.
Regards,
Greg Rahn | blog | twitter | linkedin

Pin redo logs into smart flash cache (Exadata Flash PCI F20 cache)

Need to know if we could pin redo logs into smart flash cache.
For example to pin table..
we use Alter table dhaval storage (cell_flash_cache keep) -----
Similarly can we pin redo logs into flash cache ?
If not, what is the alternative to put redo logs into flash cache ?

At Oracle OpenWorld the Exadata Smart Flash Log feature was announced. The Smart Flash Log feature requires Exadata Storage 11.2.2.4.0 or later, and Databases version 11.2.0.2 Bundle Patch 11 or greater. This feature allows a modest amount of flash to be used as a secondary write place. It wites redo to both flash and disk and returns the call to the db for the first one that finishes. By doing so it improves user transaction response time, and increases overall database throughput for IO intensive workloads.
Regards,
Greg Rahn
http://structureddata.org

Comparision between Multimaster replication and data guard

Hi,
I have some questions regarding Multimaster Replication and Data Guard. Like
*1.)* I have a web site having database in oracle 10.2.0 and multimaster replication configured on it. But whenever i need to change the structure of the tables i
need to stop replication. So my web site is unavailable but my first priority is availability. So will it be useful for me to configure data guard.
*2.)* I have configured data guard for testing . My Database is Named as Gard and physical standby database is like stan.
it is working fine.
suppose my main database server get corrupted i have no option to start main database server. Now i left with only standby server how i can start standby server
as database main server.
*3.)* Is there any if main database stop working Standby database start working as main without dba intervention.
Thanks
Umesh
Edited by: Umesh Sharma on Jan 14, 2009 4:17 AM

Hi Umesh,
first of all you should be aware that Dataguard and Replication are two completely different things.
While the database where you replicate to is always up and open in read write mode, a physical standby can either be recovering or open in read only mode.
1.) I think from what you are telling you probably should consider using dataguard with a logical standby database, but be aware that there will be some limitations regarding datatypes.
2.) you can do a failover or a switchover, depending on your database version switchback may not be possible
3.) have a look at dataguard broker, you can use it to automate the failover
Best regards,
PP

Free Report Writer for Oracle Database except Crystal Report and Data Vison

Dear All,
I want Free Report Writer for Oracle Database except Crystal Report and Data Vision software.
Wr are working on Linux and windows both platform.
Any one have direct link or website address for it ?
Regards,
Vipul Patel
Ahmedabad

Please check the following link -
http://www.google.co.in/search?client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&channel=s&hl=en&q=open+source+report+writer+for+oracle&meta=&btnG=Google+Search
Regards.
Satyaki De.

Difference between Manual Standby and Data Guard Broker..

hi,
could any let me know any usefull docs which help to understand the difference between manual dr and data guard broker?
thanks,

>
could any let me know any usefull docs which help to understand the difference between manual dr and data guard broker?
>
Without Data Guard Broker:
http://www.oracle.com/pls/db112/to_toc?pathname=server.112/e17022/toc.htm
With Data Guard Broker:
http://www.oracle.com/pls/db112/to_toc?pathname=server.112/e17023/toc.htm
See especially why you want to use the broker:
http://download.oracle.com/docs/cd/E11882_01/server.112/e17023/concepts.htm#i1013106
In short: You should have a good reason if you do not use the broker, because it is the officially recommended way to maintain Data Guard. It is even required for some features like Fast-Start Failover.
Kind regards
Uwe Hesse
http://uhesse.wordpress.com

Difference between physical standby database and Data Guard

Hi guys,
Today I attended one interview. They asked me a difference between the Oracle Physical Standby database and Oracle Dataguard?
Upto my knowledge Oracle Physical Standby Database is one type of Standby Database can be configured using Oracle Databaguard Feature.
Can you people calrify me on this.
Regards,
Vijayaraghavan K

hello,
yes you are right upto some extent...here is para form oracle doc
Oracle Data Guard is the most effective and comprehensive
data availability, data protection, and disaster recovery solution
for enterprise databases. It provides the management, monitoring,
and automation software infrastructure to create and maintain one
or more synchronized standby databases to protect data from failures,
disasters, errors, and corruptions.
Data Guard standby databases can be located at remote disaster
recovery sites thousands of miles away from the production data center,
or they may be located in the same city, same campus,
or even in the same building. If the production database
becomes unavailable because of a planned or an unplanned outage,
Data Guard can switch any standby database to the production role,
thus minimizing downtime and preventing any data loss.oracle data guard is maximum availiblity solution which maintain physical standby databases and in case of failure of production can switch production role to and standby database.
read it here
http://www.oracle.com/technology/deploy/availability/htdocs/DataGuardOverview.html
thanks and regards
VD
Edited by: Dixit on Aug 31, 2009 1:35 AM
Edited by: Dixit on Aug 31, 2009 1:36 AM

Grid Control and Data Guard Setup

Hi,
I have 4 PCs on which I wish to test the following:
1. OEM Grid Control 10.2 - Console + Service + Agent
2. Data Guard feature with Broker
3. Standby Setup for a Primary Database.
I will create the Primary DB on one Linux PC.
Standby DB using Grid Control & DataGuard on second Linux PC.
The Third PC is also Linux but the fourth PC is Windows XP.
Please guide me in understanding the following:
1. On which PCs should I install OEM Grid Control 10.2 - Console + Service + Agent?
2. On which PC should I setup DB Broker?
Please assume that I will use Oracle 10.2 Softwares and Linux x86 version.
Regards

well why don't you go ahead and test?!
Test and see whether you want to put oms, console all one machine, or whether you want to separate out the componests (you'll need an agent on each box regardless). I have no idea what the specs of your machines are, so why don't read the documentation on Grid and dataguard, see what the recommended settings are and then plan what you want to do.
Bazza

Grid control agent and data guard in mount mode

Hello,
I would like to know how you manage your data guards when you do not have the license for active data guard with the grid control agents. The standby database is in mount mode, so the agents cannot query the database.
What do you guys do in such cases? Remove the agent? Or wait till a switchover?

Check this out with a mounted database
[lo***p02].oracle:/home/oracle > sqlplus dbsnmp
SQL*Plus: Release 11.2.0.3.0 Production on Mon Jun 4 15:52:11 2012
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Enter password:
ERROR:
ORA-01033: ORACLE initialization or shutdown in progress
Process ID: 0
Session ID: 0 Serial number: 0It cannot connect.
And then
[lo****p02].oracle:/home/oracle > sqlplus / as sysdba
SQL*Plus: Release 11.2.0.3.0 Production on Mon Jun 4 15:57:49 2012
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
SQL> select open_mode from v$database;
OPEN_MODE
MOUNTED

Sql Developer and Data Guard enabled instance

I have version 1.1.2.25 SQL Developer and when I try to connect to Oracle 10gR2 instance which is data guard enabled and its logical standby it spits few message, and then connects, but data is not visible from any table.
Is there any way to see data and other code while in logical standby instance which only in read only mode?
Thanks.

This problem came when I tried to connect to Oracle
instance which is a logical standby in data guard
setup. Eventually connection is made and then you can
not see any object.
In logical standby database its suppose to be read
only and should be available for query.
In TOAD you can see every thing and when you want to
make any change ,it spits an error and wouldn't allow
you to make any change.
My question was, why SQL Developer is not showing the
objects in the list and its contains.Perhaps we could help you if you told us what the error was.

Can streams and data guard run together

I need to set up a staging database to run streams from.
Can I use data guard from the production database to the staging database and
streams on top of that?
Has anyone done this?

Correction:
Data Guard Redo Apply can be used to provide high availability/disaster recovery for a Streams database. For best practices using Dataguard Redo Apply with Streams, see http://www.oracle.com/technology/deploy/availability/pdf/MAA_WP_10gDataGuardRoleTransitionsStreams.pdf
Data Guard SQL Apply cannot be used to provide high availability/disaster recovery for a Streams database.

Supplemental logging with Oracle 10gR2 Streams and Data Guard

Hello,
I have a environment with Oracle DB 10gR2 and Physical Standby with Data Guard DR Conf. Right now, this environment is going to be extended to a replication schema using 2-way Oracle Streams Replication (for replication to the central office from this branch office, other branchs will be added soon). The primary DB will be replicated to the other primary DB (in the remote central office).
So, there is my question: It's completly necesary to specify Supplemental Logging on the sources databases (primaries) for setting 2-way Streams Replication?, and, if it's completly necesary, then, do I can set Supplemental Logging on primaries without affect theirs physical standbys, or do I need to do something special?
Thanks in advance.

Sorry, it's repeated. 'cus browser connection problem.

Grid Control 10gR2 and Data guard for repository HA

Hi,
We have a set up of two instances of OMS running on two seperate servers. I was suggested Dataguard as a failsafe high availability solution. It was to run two seperate OMSs using one single repository database, which has hot standby managed by dataguard.
But, I guess, I am confused that, if my repository fail, there will be no OMS to perform failover in Dataguard GUI.
Am I missing any point? How has others setup their repository? Any help is appreciated ...

Check this out with a mounted database
[lo***p02].oracle:/home/oracle > sqlplus dbsnmp
SQL*Plus: Release 11.2.0.3.0 Production on Mon Jun 4 15:52:11 2012
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Enter password:
ERROR:
ORA-01033: ORACLE initialization or shutdown in progress
Process ID: 0
Session ID: 0 Serial number: 0It cannot connect.
And then
[lo****p02].oracle:/home/oracle > sqlplus / as sysdba
SQL*Plus: Release 11.2.0.3.0 Production on Mon Jun 4 15:57:49 2012
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
SQL> select open_mode from v$database;
OPEN_MODE
MOUNTED

Database Smart Flash Cache and Data Guard

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