OEL and Oracle Flash Cache

Hi Im wanting to experiment with Oracle Flash Cache,
I was made aware the other day that I could only use this on OEL o/s
My Pc is currently installing this..
But could some one please clarify to me the next steps I need to take? ....
Do i next just install a standard version of 11g/r2 on OEL? .... then run the patch i believe there is to enable flash cache?
what is the oracle VM that is offered alongside the OEL O/S ?
Any help would be appriciated

Thanks, its just I was told on this forum and the following link also says:
http://guyharrison.squarespace.com/blog/2009/11/24/using-the-oracle-11gr2-database-flash-cache.html
that.... if I want to use Flash Cache and im running 11g/r2 on OEL .. then I need to install the following patch to allow this:
8974084:META BUG FOR FLASH CACHE 11.2PL BUGS TO BACKPORT TO 11.2.0.1 OEL
...Is this not true? Do i not actually need to install the patch? ... I simply install 11g/r2 and it will work?

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Turning off flash cache

Hi Im just wondering if anyone knew how to turn off Oracle flash cache,
I have it all set up and running but now I want to disable it or turn it off.
I have read that if i set the following parameter then it should do the trick...
alter system set db_flash_cache_size=o;....
If you look at the code above its an 'o' not a '0' ...
I thaught this was a bit odd? ... never the less I have used both... I get the response system altered, but when restarting the DB I get an error loading initialization parameters and have to go into the initcrcl.ora file to remove the entry...
any ideas?
Thanks

It should not be an "o", rather it should be zero.
You also need to remove parameter db_flash_cache_file from your spfile.
alter system reset db_flash_cache_file;
alter system set db_flash_cache_size=0 scope=spfileOr
edit your parameter file and remove above parameters and restart database with new parameter file. Later create new spfile
Salman

ZBOOK 17 - Flash Cache & General System Failure

Greetings,
History:
On my first windows install on my Zbook 17, the OS installed the System Reserved partition on the flash cache SSD. I figured I'd do a reinstall when I ordered and installed a 1tb SSD. I removed all HDDs and the flash cache, installed the OS, then turned off the computer and re-installed the flash cache. Now when I try to boot it gives me 5 blinks on the caps/num lock along with a lovely black screen.
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This question was solved.
View Solution.

Hello @Behr82
To get your issue more exposure I would suggest posting it in the commercial forums since the HP ZBook 17 is a commercial product. You can do this here Notebook - HP ProBook, ZBook, EliteBook, Compaq, Slate/Tablet PC, Armada, LTE
The support page for your product may be helpful in the meantime: HP ZBook 17 Mobile Workstation.
As a heads up before heading over there, the 5 blink code on the Caps Lock light indicates a motherboard failure. This doesn't always mean a hardware issue but in most cases requires a repair.
I hope this helps!
Thank you for posting on the HP Forums.
Please click the "Kudos, Thumbs Up" at the bottom of this post if you want to say "Thanks" for helping!
Please click "Accept as Solution" if you feel my post solved your issue, it will help others find the solution.
The Great Deku Tree
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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

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

Oracle Web Cache Administration and Deployment Guide

Does anyone know where the Oracle Web Cache Administration and Deployment Guide is?
From Oracle9iAS Documentation Library CD-ROM,
it says this document is in OTN. However, I just can't find this document in OTN.
Any idea?

Rick -
try this link on for size:
http://technet.oracle.com/docs/products/ias/doc_library/1022doc_otn/caching.102/a90372/toc.htm
To get to the (iAS documentation, try this path through technet
Top Level
-> click documentation link on RHS
-> click Oracle9i Application Server link
-> click Generic Documentation Library link (HTML) or (PDF)
That should get you to the documentation library, from which you can view all the component doc, install guides, performance guides, etc.
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Oracle Web Cache and OBIEE 11g

Anyone using Oracle Web Cache with OBIEE 11g?
Can I get an insight into whether this solution is beneficial? Or I shouldn't even bother.

No iam not using oracle web cache
Can I get an insight into whether this solution is beneficial? Or I shouldn't even bother.I dont have idea about it,but i think its not beneficial ,anyways there is OBIEE cache that is more than sufficient.
hope answered your question.
Cheers,
KK

Iniitialising flash cache parameters

Hi could someone please help me to set up flash cache.,..
I have OEl 5.5 installed and patched.
I have my SSD mounted..
but when i ran the command 'alter system set db_flash_cache_file ='/media/ssd/' scope=spfile;'
.... I totally messed up my database, and It wouldn't startup giving ORA-01078: failure in processing system parameters...
I have now fixed this and am back to square one ...
Could someone plzzzz help me set up the initialisation params?

The Database - General or Installation might be a better forum to place this question.
General Database Discussions
There is too little information to analyze the problem. Do you have more info in the alert_log file? Did you also receive a ORA-00439: feature not enabled: Server Flash Cache error? Is your platform and storage supported?
Here are some links that could help you to solve the problem:
http://guyharrison.squarespace.com/blog/2009/11/24/using-the-oracle-11gr2-database-flash-cache.html
Edited by: Markus Waldorf on Aug 11, 2010 5:55 PM
I just found your other post
Re: flash cache initialization parameters
so this one seems obsolete.
Edited by: Markus Waldorf on Aug 11, 2010 6:13 PM

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

11.2 Flash Cache feature

I an 11.2 RAC database running.
I tried to enable Flash Cache
db_flash_cache_file
db_flash_cache_size
when I tried to start the database i get these errors
ORA-00439: feature not enabled: Server Flash Cache
ORA-01078: failure in processing system parameters
Does anyone know how to enable the feature?
Daniel

i wonder if Oracle is using ordinary SSD in Exadata Storage Cell to enable the smart flash cache feature. Has anybody seen an Exadata V2 and can report if there are SATA/SAS - SSDs with an ordinary hard disk controller build into the storage cell or if they do it a somehow other way. All i have read is that these flash devices are not filled by a LRU algorithm. I am really interested in technical details.http://www.oracle.com/technology/products/bi/db/exadata/pdf/exadata-technical-whitepaper.pdf
Each Exadata cell comes with 384 GB of Exadata Smart Flash Cache. This solid state storage delivers dramatic performance advantages with Exadata storage. It provides a ten-fold improvement in response time for reads over regular disk; a hundred-fold improvement in IOPS for reads over regular disk; and is a less expensive higher capacity alternative to memory. Overall it delivers a ten-fold increase performing a blended average of read and write operations.
The Exadata Smart Flash Cache manages active data from regular disks in the Exadata cell – but it is not managed in a simple Least Recently Used (LRU) fashion. The Exadata Storage Server Software in cooperation with the Oracle Database keeps track of data access patterns and knows what and how to cache data and avoid polluting the cache. This functionality is all managed automatically and does not require manual tuning. If there are specific tables or indexes that are known to be key to the performance of a database application they can optionally be identified and pinned in cache.There look to be two important advantages over regular SSD attached to an Oracle database here: that the caching is in combination with the Oracle Database (not just LRU, just as you point out yourself), but also that the storage cell's SmartScan technology will only project the required rows and columns to the database server so that higher effective bandwidths are achieved.

11gR2 Vs Exadata- Flash Cache performance

Flash Cache feature is available in both 11gR2 & Exadata. The difference being in 11gR2 it is an extension of the database buffer, however in Exadata it is a separate hardware component in the storage server.
Apart from this, I would like to know how the Exadata Smart Flash Cache is superior to the 11gR2 flash cache? Is it that the 11gR2 flash cache is not "smart" and ends up caching data that is not useful in terms of caching.
The 11gR2 oracle documentation does not seem to mention anything about this flash cache feature. Any idea?
Edited by: museshad on Jun 8, 2011 2:13 PM

Exadata Smart Flash Cache and Database Smart Flash Cache use SSD advantages.
On Exadata, We don't need to change anything in Database (database machine). We just "create flashcache" on cell. and Exadata Environment not support 11gR2 feature (Database Smart Flash Cache), Because it has Exadata Smart Flash Cache.
http://surachartopun.com/2011/02/how-to-use-exadata-smart-flash-cache.html
On 11gR2 (none Exadata) and have flash disk, we can use Database Smart Flash Cache, We have to change 2 initialization parameters on database.
db_flash_cache_file
db_flash_cache_size
http://surachartopun.com/2010/02/oracle-11gr2-flash-cache.html
Flash Cache feature is available in both 11gR2 & Exadata. On Exadata, we use Exadata SMart Flash Cache.
On None Exadata, we use database smart flash cache.
*** Exadata Environment not support 11gR2 feature (Database Smart Flash Cache) ***
The difference being in 11gR2 it is an extension of the database buffer, however in Exadata it is a separate hardware component in the storage server.when we get data, we read from disks to database buffer, when blocks are evicted from database buffers, they are stored in flash cache. After that ... someone get data again -> oracle read in database buffer cache, if not found, then oracle read in flash cache(if not found, oracle read from disks)
read more:
http://www.oracle.com/technetwork/articles/systems-hardware-architecture/oracle-db-smart-flash-cache-175588.pdf
http://www.oracle.com/technetwork/middleware/bi-foundation/exadata-smart-flash-cache-twp-v5-1-128560.pdf
Apart from this, I would like to know how the Exadata Smart Flash Cache is superior to the 11gR2 flash cache? Is it that the 11gR2 flash cache is not "smart" and ends up caching data that is not useful in terms of caching.read 2 above whitepapers.

Squid and Oracle Apps

Hello,
I hope I put this in a right forum. I'd put in the Linux (Non OEL) forum but still not solved yet.
I'm trying to setup squid in Fedora 13 and get a problem with Oracle Apps. I'd setup so that only certain user can request http service by setup the authentication.
By default, there's already acl rule for port 1025-65535 and I'd created a rule to allow access to my domain for our local user.
For the port the acl is like this : acl Safe_ports port 1025-65535
For the domain the acl is like this : acl tstdomain dstdomain_regex \.testdomain.com$
Now what I want to have is if a user doesn't have authentication, he/she can still access local webpage in our server, such as webserver or Oracle E-Business Suite.
I'd tested, using a user that doesn't have authentication, and can access all my server if the domain doesn't have any port but it didn't work for Oracle E-Business Suite, because to access the format is like http://hostname.domain_name:port_number.
I'd tested to put the port & allow http access specifically like this:
acl oratest_port port 8000
http_access allow oratest_port
and even removed the port restrictions
but still not worked.
If I take out the squid proxy and connect directly to Oracle Apps it worked without any problem.
Is there anything I need to add/change/misplaced? thanks.
Edited by: user_apps on Jul 15, 2010 9:47 PM

Hi,
Please mention your application release along with the database version and OS.
Are you trying to setup a web cache? If yes, please refer to:
Note: 306653.1 - Installing and Configuring Web Cache 10.1.2 and Oracle E-Business Suite 11i
Note: 380486.1 - Installing and Configuring Web Cache 10g and Oracle E-Business Suite 12
Thanks,
Hussein

Flash Cache is not Flash Disk. Right ?

Hardware: X3 - Half Rack
# imageinfo
Kernel version: 2.6.32-400.11.1.el5uek #1 SMP Thu Nov 22 03:29:09 PST 2012 x86_64
Image version: 11.2.3.2.1.130109
Image activated: 2013-09-24 18:12:52 +0800
Image status: success
System partition on device: /dev/mapper/VGExaDb-LVDbSys1
In our Non-Exadata RAC DBs we use LUNs from Hitachi VSP frame. For very busy DBs like Siebel , we wanted to place our Online Redo logs on high speed disks.
So, our Hitachi SAN admins have allocated LUNs exclusively from Flash Disks within Hitachi VSP frame and we have created Redo Log diskgroup based on these 'Thick provisioned' disks.
This has increased the performance of our RAC DBs significantly.
As I understand, In exadata, you don't have the normal flash disk. Instead, the flash modules are mounted in a PCIexpress card.
In CellCLI> list physicaldisk detail you can see multiple entries like below belonging to the 'flash disk'
          name:                   FLASH_1_0
         diskType:               FlashDisk
         luns:                   1_0
         makeModel:              "Sun Flash Accelerator F40 PCIe Card"
         physicalFirmware:       UI39
         physicalInsertTime:     2013-09-13T17:56:10+08:00
         physicalSerial:         5L0066Y5
         physicalSize:           93.13225793838501G
         slotNumber:             "PCI Slot: 1; FDOM: 0"
         status:                 normal
Although these flash cards can store persistent data because it has battery in it in server goes down, is it actually used to store persistent data.
Smart flash cache is just a caching mechanism for frequently accessed data. Right ? We cannot create diskgroups based on disks from these 'Flash Disks' . Right ?

Hi GaryB,
The short answer to your question is: yes, it's possible to use configure flash as permanent storage using "flash griddisks". But in the case of redo logs, it would actually make them perform slower.
The longer explanation: foreground redo writes (the "log file sync" wait event) are very latency sensitive, so it's important for write to be acknowledged as fast as possible. Flash is considerably faster than disk, but not nearly as fast as battery-backed RAM. And Exadata storage servers do have a RAM write cache on their disk controllers. So you will get the best foreground redo write performance from RAM cache write, except when the write cache is full, at which point redo writes need to wait on disk.
Since 11.2.2.4.0 was released in 2012, Exadata has the capability to write redo to _both_ RAM-cached disk and flash memory, and use whichever returns first. So you get the lightning-fast latency of RAM cache unless the cache is full, and worst-case latency is the speed of flash. This capability, smart flash logging, is enabled by default on new Exadata builds; you can check its status by running "view flashlog detail" in CellCLI.
More details in the official whitepaper: http://www.oracle.com/technetwork/database/exadata/exadata-smart-flash-cache-366203.pdf
Hope this helps!
Marc

Need RAC/ASM multinode flash cache configuration advice

We have a working two-node RAC database. We are installing a new 640gb fusion flash card in each node. The card is a double-card, so that it shows up as two devices: /dev/fioa and /dev/fiob on each node.
We have created two private disk groups, one on each node. The disk group on node 1 is "+FLASHCACHE" and the disk group on node 2 is "+FLASHCACHE2".
We haven't found any specific examples of how to configure the init parameters for flashcache on RAC/ASM. We are guessing that we should do the following. If someone would critique and confirm or suggest something different, we would appreciate it very much!
prod1.db_flash_cache_file='+FLASHCACHE/flash1'
prod2.dg_flash_cache_file='+FLASHCACHE2/flash2'
*.db_flash_cache_size=600G
Thanks for any advice.
Jim
Edited by: jimbev90 on Jan 5, 2012 8:18 AM

Hi Jim,
prod1.db_flash_cache_file='+FLASHCACHE/flash1'
prod2.dg_flash_cache_file='+FLASHCACHE2/flash2'
*.db_flash_cache_size=600GYour configuration is correct.
Database Smart Flash Cache is not shared across RAC nodes; it is private to each RAC instance. For that reason, each RAC instance must define its own local flash cache file path. When the flash cache is managed by ASM, a separate diskgroup is needed for the flash cache of each instance.
You can use ALTER SYSTEM to set db_flash_cache_size to zero to disable the flash cache. You can also use ALTER SYSTEM to set the flash cache back to its original size to reenable it.
Read this white paper Oracle Database Smart Flash Cache
http://www.oracle.com/technetwork/articles/systems-hardware-architecture/oracle-db-smart-flash-cache-175588.pdf
Regards,
Levi Pereira

OEL and Oracle Flash Cache

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