TimesTen VS smart flash cache

Similar Questions

• Question about smart flash cache

  If my entire db is less than the amount of smart flash cache that is available, Exadata would automatically cache entire DB in smart flash cache?
  I understand I can say Exadata at the tables of the PIN in the cache but just curious if Exadata would on its own in this scenario.
  Thank you.

  user12254641 wrote:
  If my entire db is less than the amount of smart flash cache that is available, Exadata would automatically cache entire DB in smart flash cache?

  No, it not being cached everything simply because the DB is longer than the Smart Flash Cache. Caching is performed because of access to data, so frequently accessed data will be cached. Given at the cold end of the LRU algorithm gets years off and replaced.

  It is very similar to the DB buffer cache - you don't expect all your data to cache simply because the cache DB is greater than your data. However, if the frequently accessed data can all be cached, it will be.

  --
  Kind regards
  Greg Rahn | blog | Twitter | LinkedIn

• Smart Flash Cache

  Please, can someone confirm if Smart Cache Flash is supported on 11 G R2 Standard Edition?

  I understand that it is only supported on the operating systems Solaris 11 and OEL

  I ask because I get the error below to start the DB after you configure the init parameters

  ORA-00439: feature not enabled: Flash Cache Server

  Download the Enterprise edition

  concerning

  Pravin

• Need advice from configuration to the flash cache multi-node RAC/ASM

  We have a database of CARS to work two nodes. We install a new fusion 640 GB flash card in each node. The is a double card, so that it shows up as two devices: / dev/fioa and/dev/fiob on each node.
  We have created two groups of private drives, one on each node. The Group of disks on node 1 is '+ FLASHCACHE' and the disk on node 2 group is "+ FLASHCACHE2".
  
  We have not found specific examples of how to configure the parameters of the init for flashcache on RAC/ASM. We guess that we must do the following. If anyone would be critical 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
  
  Published by: jimbev90 on January 5, 2012 08:18

  Hi Jim,.

  prod1.db_flash_cache_file='+FLASHCACHE/flash1'
  prod2.dg_flash_cache_file='+FLASHCACHE2/flash2'
  *.db_flash_cache_size=600G
  

  Your configuration is correct.

  Smart Flash Cache database is not shared across RAC nodes. It is private to each RAC instance. For this reason, each RAC instance must define its own local cache of flash file path. When the flash cache is managed by ASM, a separate diskgroup is necessary for each instance flash cache.

  You can use ALTER SYSTEM for db_flash_cache_size set to zero to disable the flash cache. Alternatively, you can use ALTER SYSTEM to deliver the flash cache to its original size to reactivate it.

  Read this white paper Oracle database Smart Cache Flash
  http://www.Oracle.com/technetwork/articles/systems-hardware-architecture/Oracle-DB-smart-Flash-cache-175588.PDF

  Kind regards
  Levi Pereira

• How to confirm the object was pinned in the flash cache exadata

  Hello

  I just wanted to confirm, if the object has been pinned in flash cache

  SQL > select nom_segment, cell_flash_cache from user_segments WHERE where cell_flash_cache = 'KEEP ';

  no selected line

  SQL > alter table scott.emp storage (cell_flash_cache) keep;

  Modified table.

  SQL > select * from scott.emp;

  SQL > select nom_segment, cell_flash_cache from user_segments WHERE where cell_flash_cache = 'KEEP ';

  no selected line.

  Here you go...

  Exadata Smart's scans and the Flash Cache

• ZBOOK 17 - Flash Cache & general system failure

  Greetings,

  History:

  On my first install of windows on my 17 Zbook, the operating system installed the system reserved on the flash SSD cache partition. I thought I'd do a reinstall when I ordered and installed a 1 TB SSD. I removed all hard drives and flash installed the operating system cache, then turned off the computer and re-installed the cache flash. Now when I try to boot it gives me 5 flashes on the caps/NumLock with a pretty black screen.

  Has anyone encountered this before? All I could do to fix it? Thanks in advance,

  Ryan

  Thanks for the reply. I'll be sure to do that next time.

  I eventually found how to fix it. I removed all the readers, disconnected from all power and then removed the BIOS battery. He gave some time, clinging to power, and she came back to life. Of course he gave me some error messages, but after removing the power again and reconnect all devices (the ssd of 32 GB samsung flash cache included) then turn it on, everything was back to normal.

  No idea why she wanted to play dead but at least he's back running.

• Update 24GB flash Cache hard drive for some other SSD acceleration

  Hello Experts,

  I plan to buy-

  HP ENVY 15 t-j100 Quad Edition Notebook PC (ENERGY STAR)

  -With

  • 1 TB 5400 RPM hard drive
  • 24GB flash acceleration Cache hard drive

  What can I upgrade (/replace) 24GB flash Cache acceleration of the drive with some other SSD whose greater storage size on the line after a few days? for example 240GB Crucial SSD?

  Thank you.

  It's different. Any other animal. It looks like a wireless card. See below. What you could do with a standard 2.5-inch SSD is to replace the original main drive. If you could total of 240 concerts that would be OK. You will need to remove the disc from mSATA (aka WSSD) as it is useless in a WSSD Accelerator reader when you have a main SSD drive. I guess that I encourage you to wait and see how you like the stock configuration. The WSSD throttle control is very effective and can make even a 5400 RPM hard drive mechanics work almost as fast as an SSD.

  

• Flash Cache - what is it?

  Hi - I "m given to replace the HARD drive in 141na HP ENVy 17 and doing a little research before doing so. Some retailers say it has a SSD 8 GB and a 1 TB of HARD drive, while others do not.

  I've been looking at the specs on the HP site and it says it has a FLASH 8 GB CACHE and other research says this;

  "Flash cache is temporary storage chip NAND flash memory to allow data of queries for the data to complete more quickly..." A flash cache is often used in tandem with the slower hard drives (HDD) to improve the access time to the data. The form factor of the NAND flash is typically a the solid state drive (SSD), a PCI Express (PCIe) card or a module DIMM- base flash device installed in connectors of the server memory. "

  Does that mean that upgrading to an SSD will be have a limited effect (bearing in mind I've only will use to store the OS and a few programs like Photoshop top with all my work files on the 1 TB HARD drive or I am barking the wrong tree here.)

  All the advicde greatly appreciated.

  Chris

  The NAND flash cache is actually built into the hard drive, I'm pretty sure. I can confirm that if you go into Device Manager and view the description of the hard disk device. That means that when you remove the drive hard drive will also remove you the "flash cache. While hard disks with flash cache mSATA WSSD accelrator cache disks / improve performance they ain't nothing like a pure SSD main drive. The cache flash and other similar arrangements can accelerate sustained as an SSD read/write operations.

• Expectations of reading Flash Cache

  I start looking for flash caching. We lack version 5.5 on Dell PE servers connected to a PS6000 EQ. We have been hitting our max IOPS fairly regularly on the equalizer. We have a few writing intensive VMs Windows doing statistical analysis and some Linux VM a web hosting infrastructure. The average ratio of writing on the EQ is high enough, usually 90%, because some of the Windows virtual machines are very active, while everything else is fairly inactive. When some of the Windows virtual machines get his job stat, we begin to see latency on web VMs, especially those that host the databases (as you know).

  I understand the flash read cache will not help high write workloads, but it would help individual web virtual machines who see some latency no - is that correct?

  Also, I am reading the guide of best practices flash cache, but I was wondering if anyone had advice from real world for the size of the cache on the VMS or thoughts on the use of some of the ssd for the swap of the host. If we put an ssd in each of our hosts, should set us aside a certain percentage for the swap to host?

  Thank you.

  Tim

  Unless you have problems with memory capacity, I wouldn't worry too much on the caching of the swap host.  If you are out of memory, then consider adding more ram or evolution and the addition of several hosts.

  As for the flash cache, did consider you - PernixData - you can speed up both read and write performance, which gives to your configuration, I think that would be the type of solution, you should consider caching.

• Flash cache initialization settings

  Hi, I recently got patched up OEL and works with a flash mounted on my system drive... I now want to have a play around with oracle flash cache...
  
  I need set the following... db_flash_cache_file and db_flash_cache_size
  
  could someone help me with the syntax to do? is this something in the sense of
  
  ALTER system set db_flash_cache_file ='/ media/ssd /';
  
  ALTER system set db_flash_cache_size = "xxgb"?
  
  Any help would be appreciated
  
  
  for example, I tried...
  
  SQL > alter system set db_flash_cache_file ='/ media/ssd /';
  ALTER system set db_flash_cache_file ='/ media/ssd /'
  *
  ERROR on line 1:
  ORA-02095: specified initialization parameter is not editable
  
  Published by: user9200169 on August 11, 2010 09:50

  so, when I select * from v$ version and it said 11.2.0.1.0...

  even if I have the version 11.2.0.1.2 due to the application of the fix 9654983?

  Yes. I think that Oracle would call it version no version. If search you metalink patch 8974084 you will see the patch for versions/versions: 11.2.0.1.0 and 11.2.0.1.1.

  to remedy this situation all I should follow the steps below:

  1 restore 9654983
  2. apply 9352237
  3 then apply 8974084

  ... then the flash cache must be enabled?

  fix. do not forget to enter 8974084 for 11.2.0.1.1.

  -ap

• Smart response caching: HARD + SSD on Inspiron 15R drive SE, mSATA value SRT, still no button "Accelerate."

  Hello

  This is probably a common problem that has been explained earlier, but I cannot find an answer here-I found describing almost the same question, but still not the same as the son.

  So I have a cool Inspiron 15R SE with pre-installed Windows 8, 1 to HDD and SSD 32 GB on mSATA included for caching purposes. The problem is that, as far as I can see, without acceleration/cache that really happens with my SSD as just another drive.

  In the BIOS my mSATA operation is set to 'Intel Smart Response technology' which seems to be a good option for caching. Looks like on this screenshot I took from another thread, the yellow highlighted option is selected in my system:

  

  But when I boot in Windows 8 and run the Intel Rapid Storage Technology technology, I don't see "Accélération" button / tab - as if my drive is not eligible or is in the wrong mode. This is the screenshot of my Intel utility for you to see there is no option to activate the cache:

  

  If it's relevant, my SSD drive appears in my disk management console and is also available as a regular drive in Explorer and other files with a drive letter assigned managers (guess which indicates the acceleration is not in use).

  There is also a Hibernate (8 GB) on this disk partition, but there is still enough for caching (mandatory min 16 GB, 20 GB left) free space. Should I try to disable hibernation? My hiberfil.sys file is on the HARD drive so that probably won't help. Here is a screenshot of another utility pre-installed from Intel, Intel Quick Start Technology Manager, if this might be relevant:

  

  Any ideas are much appreciated, I've been strongly trying this additional disc and it was actually the main reason for me to choose this particular laptop model. It's a shame, I can't use it for some reason any.

  Thank you very much!

  I found the answer. To activate the acceleration must be no. PARTITIONS on the SSD drive even if it is still not enough allocated space.

  If the partition of QuickStart technology, with that my laptop came prevented Rapid Storage to accelerate.

  After I deleted all partitions on the disk, it worked.

  If you still need the partition of quick start or for other purposes, you can specify less space for acceleration during the installation and create your partition later.

• vSAN 5.5 U2 - Flash Cache error reading configuration ' reason: an error occurred during the configuration of the host.

  Hosts: DL360 G6, dual quad core, 64 GB of RAM

  Discs: 3 SAS 10K rpm and 2 SSD Spidles.

  I am trying to set up one of the hosts of Read Cache Flash but I get the desciptive never so much and the defenseless error message...

  "Configuration on disk/vmfs/device/disks/naa. < longguid > has failed. "Reason: an error occurred during the configuration of the host.

  I hope that there is a log file I can verify for a more profound description of this lame error message.

  Can someone tell me where I can check on this error?

  Thank you

  Oh. k. so, it is the function of Read Cache (vFRC) Flash of vSphere and nothing to do with VSAN

  check the diaries which is throwing this error.

  ESP: /var/log/hostd.log and log/var/log/vmkernel of corresponding calendar. This will show what is happening here

  You can check the following

  one.

  Check if SSD LUNS are not used / no other partition

  # partedUtil getptbl/vmfs/devices/drives.

  b.

  Also check that the SSD lun on that host are local and eligible for the vflash

  List of devices # esxcli storage vflash

  Thank you

• vpshere edition to use Flash Cache reading

  Hi all...

  Reading the information on this new feature of version 5.5, it seems very interesting, but comes standard on the Standard and Enterprise versions? ..... I say this because in the vmware site Web, in editions of comparison chart, appears as the "point" in the plu company...

  A welcome message...

  Welcome to the community,

  I can't tell you what the future will bring, but from now on, read Cache Flash unfortunately is only available with the Enterprise Plus license.

  André

• What Flash Cache completely transparent? Can I see the contents of a cache of flash?

  Hello
  
  is it possible to see the contents of a cache flash as v$ bh?

  On the layer of cells, you can make

  CellCLI> list flashcachecontent
  

  Which returns more info on flashcached objects, among other the objectnumber you can recover on the layer of database with DBA_OBJECTS (object_id here).
  As far as I KNOW, there is no direct view of the data for this layer.

  Kind regards
  Uwe Hesse

  http://uhesse.WordPress.com

  P. S.

  Example to look at several cells for FlashCache to some table information:

  dcli -g cells.txt "cellcli -e list flashcachecontent attributes cachedKeepSize,cachedSize,hitCount where objectnumber=75698"
  

  Use of dcli as above is explained here:
  http://uhesse.WordPress.com/2011/03/22/Exadata-part-VI-cell-administration-with-DCLI/

  Published by: Uwe Hesse on 22.03.2011 14:22
  Added the dcli component

• All dynamic views for (Exadata) Flash using the Cache?

  All,
  
  Although it is one of the main points of sale of Exadata (especially of the X 3 from), I am struggling to find much information about our use of the Exadata Smart FlashCache (I'm under RDBMS 11.2.0.2 BP7 on a quarter V2-rack).
  
  I can check the FlashCache usage by checking if the object has been "pinned" to the FlashCache via DBA_SEGMENTS and I use FlashCache can check by querying a gv$ sysstat (and even v$ mystat), but are there other views that I could use? It seems a little strange for Oracle is not to enlighten the DBA on their use of this feature...
  
  Mark

  Hi Mark,

  My colleague Christo Kutrovsky put in place a script smart to collect this info of storage servers and accessed as an external table: http://www.pythian.com/blog/whats-in-your-exadata-smart-flash-cache/

  HTH!

  Marc