Question about smart flash cache

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• TimesTen VS smart flash cache

  Hello
  
  I know that Flash Cache is slower than RAM, but can we say that doesn't cache smart flash the same work as the Oracle TimesTen Database Cache?
  Wrong or right?
  
  Thank you very much for helping me in my understanding.
  
  Edited by: 905160 Dec 30. 2011 00:58

  Bad :-) Smart Flash Cache is still in the storage layer and so does nothing to eliminate the code path heavy of a disc centered on the RDBMS. One of the main advantages of TimesTen is there a short circuit code path a lot thanks to its simple design and optimizations in the memory. There is a large part of the improved source performance. Also smart flash cache does not all access operations, but only those that use the smart cache.

  Smart Flash Cache is a great way to help the performance of a focused database on disk and it is used wisely in the Exadata buffer. But you should consider not equivalent to, or a substitiute for, cache TimesTen in-Memlory database. These are very different things, work very differently from each other and offer different benefits.

  Chris

• 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

• Question Basic setting, ask questions about the buffer cache

  Database: Oracle 10g
  Host: Sun Solaris, 16 CPU server
  
  
  
  I look at the behavior of some simple queries that I start the tuning of our data warehouse.
  
  Using SQL * more and AUTOTRACE, I ran this query two times in a row
  
  SELECT *.
  OF PROCEDURE_FACT
  WHERE PROC_FACT_ID BETWEEN 100000 AND 200000
  
  He finds the index on PROC_FACT_ID and conducted an analysis of the range of indexes to access the data in the table by rowid. The first time, that it ran, there are about 600 physical block reads as data in the table were not in the buffer cache. The second time, he had 0 physical block reads, because they were all in the cache. All this was expected behavior.
  
  So I ran this query twice now,
  
  SELECT DATA_SOURCE_CD, COUNT (*)
  OF PROCEDURE_FACT
  DATA_SOURCE_CD GROUP
  
  As expected, he made a full table scan, because there is no index on DATA_SOURCE_CD and then chopped the results to find the different DATA_SOURCE_CD values. The first run had these results
  
  compatible gets 190496
  physical reads 169696
  
  The second run had these results
  
  compatible gets 190496
  physical reads 170248
  
  
  NOT what I expected. I would have thought that the second run would find many of the blocks already in the cache of the pads of the first execution, so that the number of physical reads would drop significantly.
  
  Any help to understand this would be greatly appreciated.
  
  And is there something that can be done to keep the table PROCEDURE_FACT (the central table of our star schema) "pinned" in the buffer cache?
  
  Thanks in advance.
  
  -chris Curzon

  Christopher Curzon wrote:
  Your comment about the buffer cache used for smaller objects that benefit is something that I asked about a good deal. It sounds as if tuning the buffer cache will have little impact on queries that scan of entire tables.

  Chris,

  If you can afford it and you think it is a reasonable approach with regard to the remaining segments that are supposed to benefit the buffer cache, you can always consider your segment of table with 'CACHE' that will change the behavior on the full of a broad sector table scan (Oracle treats small and large segments differently during the execution of table scans complete regarding the cache of) marking stamps, you can override this treatment by using the CACHE. NOCACHE keyword) or move your table of facts to a DUNGEON hen establishing a (ALTER SYSTEM SET DB_KEEP_CACHE_SIZE = ), modify the segments (ALTER TABLE... STORAGE (USER_TABLES KEEP)) accordingly and perform a full table scan to load blocks in the cache of the DUNGEON.

  Note that the disadvantage of the approach of the KEEP pool is that you have less memory available for the default buffer cache (unless you add more memory on your system). When an object to mark as being cached is always is in competition with other objects in the cache buffers by default, so it could still be aged out (the same applies to the pool of DUNGEON, if the segment is too large or too many segments are allocated age blocks out as well).

  So my question: How can I get for a parallel analysis on queries that use a table scan complete such as what I posted in my previous email? It is a question of the provision of the "parallel" indicator, or is it an init.ora parameter I should try?

  You can use a PARALLEL hint in your statement:

  SELECT /*+ PARALLEL(PROCEDURE_FACT) */ DATA_SOURCE_CD, COUNT(*)
  FROM PROCEDURE_FACT
  GROUP BY DATA_SOURCE_CD;
  

  or you could mark an object as PARALLEL in the dictionary:

  ALTER MATERIALIZED VIEW PROCEDURE_FACT PARALLEL;
  

  Note that since you have 16 processors (or 16 cores that resemble Oracle 32? Check the CPU_COUNT setting) the default parallel degree would be usually 2 times 16 = 32, which means that Oracle generates at least 32 parallel slaves for a parallel operation (it could be another set of 32 slaves if the operation for example include a GROUP BY operation) If you do not use the PARALLEL_ADAPTIVE_MULTI_USER parameter (which allows to reduce the parallelism if several parallel operations running concurrently).

  I recommend to choose a lesser degree parallel to your default value of 32 because usually you gain much by such a degree, then you can get the same performance when you use lower a setting like this:

  SELECT /*+ PARALLEL(PROCEDURE_FACT, 4) */ DATA_SOURCE_CD, COUNT(*)
  FROM PROCEDURE_FACT
  GROUP BY DATA_SOURCE_CD;
  

  The same could be applied to the paralleling of the object:

  ALTER MATERIALIZED VIEW PROCEDURE_FACT PARALLEL 4;
  

  Note When defining the object of many operations in PARALLEL will be parallelisee (DML even can be run in parallel, if you enable dml parallel, which has some special restrictions), so I recommend to use it with caution and begin with an explicit indication in those statements where you know that it will be useful to do.

  Also check that your PARALLEL_MAX_SERVERS is high enough when you use parallel operations, which should be the case in your version of Oracle.

  Kind regards
  Randolf

  Oracle related blog stuff:
  http://Oracle-Randolf.blogspot.com/

  SQLTools ++ for Oracle (Open source Oracle GUI for Windows):
  http://www.sqltools-plusplus.org:7676 /.
  http://sourceforge.NET/projects/SQLT-pp/

• A few questions about VMware Flash Read Cache (vFRC)

  Hello

  1) there is a way to simulate a VMFS datastore as SSD device. See the instructions in the following link:

  http://tomverhaeg.nl/VMware-ESXi/VMware-ESXi-tag-a-device-as-local-and-SSD/

  1 a) can we fake a NFS datastore as a SSD device?

  1 (b) partitions on the SSD device must be empty in order for the vFRC to work.

  There are two scenarios here: empty the lun (with no VMFS file system) and VMFS LUNS (with no data). Both scenarios would work for vFRC?

  (2) a device SSD shareable by multiple ESXi hosts?

  (3) several flash pools can be created for each host ESXi? If so, what is the maximum number of pools of flash can be created by ESXi host?

  (4) a device SSD can be used as a local drive?

  1 a) can we fake a NFS datastore as a SSD device?

  >> N°

  1 (b) partitions on the SSD device must be empty in order for the vFRC to work.

  There are two scenarios here: empty the lun (with no VMFS file system) and VMFS LUNS (with no data). Both scenarios would work for vFRC?

  > empty lun with no partitions is necessary... Partitioned VMFS LUNs cannot be used because VFRC works with VFFS file system

  (2) a device SSD shareable by multiple ESXi hosts?

  > not in a context vFRC, normal on SSD lun VMFS datastore can be shared and used for features such as "swap for ssd.

  (3) several flash pools can be created for each host ESXi? If so, what is the maximum number of pools of flash can be created by ESXi host?

  > No, there may be only one pool that will be shared for all VMDK to a permit for the use of vFRC. but also exchange for SSD if configured.

  (4) a device SSD can be used as a local drive?

  > claiming remote as local is possible. but not recommended and performance improvement is not guaranteed in this case with vFRC...

• QUESTION ABOUT ADOBE FLASH

  On the top of my screen, I get a notice every time that I'm looking for a Web site. According to him, «ALLOW to RUN ADOBE FLASH...» CONTINUE TO BLOCK... ALLOW. "I don't know what that means. How can I remove this notice for good?

  Why would you remove your questions? They are in the forums to help other users with similar issues that come to the research.

• Question about Toshiba Flash Cards

  Hi all

  Just a quick question. Is it possible that I can have the animation at the top of my screen turned off and STILL have functional function keys? When I run several programs or on battery, it takes forever for the animation to come out and it's just an annoyance. Anything to fix it? Any other software to make them functional? Or any update?

  My system is Windows Vista, just in case anyone wants to know.
  Thank you
  Dave.

  Why provide purposes, you need the FN keys when the laptop is on battery?
  I mean, why use them at all times and so often.

• Question about the Flash Player installer

  I downloaded the installer from Adobe Flash Player on my Mac - OS Mavericks.  The installer does not accept my password to install the update.  Gives the message "password changed" I went to Adobe and changed my password, but the installer still does not accept the password or start the installation.

  Hi John,.

  The required password is not your AdobeID password.  It's the password of your computer, allowing you to connect to your account.  Please see what userid & password I need to install Flash Player? for more information.

  --

  Maria

• Question about Eclipse link Cache coordination

  Hello
  
  I use the Eclipse coordinating Cache link in a clustered environment. I am using the coordinating cache synchronization notifications in the cluster and logical implementation of related applications.
  
  I have a Weblogic cluster with 3 knots. My intension is that if any cache on JPA entity is modified, its postMerge(DescriptorEvent event) method should be called on all nodes in a clustered environment, except the node where the JPA entity is changed. But the postMerge() method is called on the node where the JPA entity has been changed. As a result of this postMerge() method runs the application logic, which is not necessary that the modification is done and it's an overload. I tried, I could get a property any of the DescriptorEvent/ClassDescriptor to circumvent this extra activity. I saw a difference in the Type of Session of the DescriptorEvent class. The session type in the node, where the change arrived is UnitOfWork (RepeatableWriteUnitOfWork) and all other nodes remotely is ServerSession. There are several other types of session. From now on, I used UnitOfWork as a filter to ignore the extra synchronization call on the node, where the entity is changed. But his is not consistent, sometimes on the same node, where the entity is modified, the postMerge() methos is bieng called several times with the session as a UnitOfWork and ServerSession type. My filter in the postMerge() method will fail if the session type is ServerSession.
  
  * Filter that I used in the postMerge() to ignore the activity: + if (!) () event.getSession () .isUnitOfWork ())) {+ *}
  
  another option, I've tried is MergeManager, as follows. But as is the inner class, and if the type of session is SeverSession and not UnitOfWork (RepeatableWriteUnitOfWork), this logic doesn't work. We could get the MergeManager of the ServerSession?
  * ((UnitOfWorkImpl) de.getSession () .getActiveUnitOfWork ()) .getMergeManager () .shouldMergeChangesIntoDistributedCache (); *
  
  Is there another approach I can get the call either by the local node or the remote node of the DescriptorEvent? That rely solely on the session type (UnitOfWork) may not be appropriate. Could you please help me solve the same?
  
  
  Thanks in advance!
  
  Kind regards
  Srinivas Medukonduru

  The postMerge() occurs on the source node because it must merge the changes into its cache the same as all the caches of the other server.

  You can access the ObjectChangeSet of the DescriptorEvent on the source node and check his clone using getUnitOfWorkClone(), it will be null on all remote servers.

  ---
  James: http://www.eclipselink.org

• Question about updating Flash of Internet Explorer.

  That's why when I update Flash Player 10 on a Windows 7 machine that the ActiveX control is updated first, then maybe a day or two later, I'll do another update to install the Flash plugin?  How is it that they don't are not updated at the same time?  I can download the executable Flash in Safari in Windows and update the plugin manually.  Generally, I look in programs and features, and the ActiveX control is the first update.

  Because the ActiveX and plugin are two different installers.

  If you want to download and install them at the same time, download the two of

  http://www.Adobe.com/products/flashplayer/fp_distribution3.html

• Two 'how to' questions about making flash animations.

  I am the only member of the advertising department and I need to make an announcement for my class virtual business: Uncommon Ground.

  I have a big you and a big G that come towards the screen style 3d. Once that wears off, I have a problem making the entire screen fades to black.

  Any advice?

  It's as simple as that.

  After that, I want our slogan (imagine the simplicity) appear in silver writing. So I want a shimmering light across each of the letters in a massive movement from left to right.

  Any help on these two things would be greatly appreciated, since I am so new to Flash! Only been at it since the beginning of this semester.

  Thanks in advance,

  Dillosaurus Doss

  For effect "fade to: black

  Create a black rectangle that covers the area of the entire scene. Turn it into a clip. Tween its alpha property to 0-100% compared to a number of images wanted.

  To make silver letters appear from left to right:

  Create the text exactly as you want with whatever the effects of police you need, etc. On a top layer, create a rectangle or a similar form to use as a mask for text, convert it to a clip. The form must be large enough to cover all of your text. A rectangle should do the trick. Animate the rectangle from left to right, starting with it just to the left of your text and ending with him covering your text completely. Once it is finished, right-click on the layer of the rectangle and select "hide" - this turns into a layer mask and mask the layer beneath it automatically (your text in this case). The layer mask and the masked layer must be locked in order to see the final result in the timeline (this does not apply to the file made .swf - just for viewing in the timeline).

  To animate a flickering on the text:

  Copy the layer earlier and add an effect of hue in the properties panel and make white 100% tint. Make sure this layer is on top of all your layers. Similarly to the example above of the masking text, create a rectangle, but this time, making it large enough to cover all of the text, but it make think to so that you can see only a little of it at the time. Animate the rectangle from left to right across your text, then turn it into a layer mask and don't forget to add your new white tinted text under that mask.

  You can twist things needed to here, as lower the opacity of the tint layer text, replace with overlay, etc..

  Good luck!

  -TySteck

• Question about a flash/html5 player WAV cross-platform

  Hello world

  I am looking for an audio player that can playback and streaming file .wav inside the Web page.

  Previously, I found a Jplayer of (http://www.jplayer.org) which is very good.

  Unfortunately, the IE9 browser does not support HTML5.

  My heart more later Adobe AIR can convert the source files for the package of AIR in support of the application is running under a different platform.

  However, my AIR package still cannot work normally (can not playback of the audio file) after that I generated from Dreamweaver CS5.5 AIR package

  An AIR package has nothing to do with it. It is simply designed as a compact distribution for mobile devices, but it does not change the rules of the game in common browsers. In any case, nothing prevents you to integrate your stuff using the conventional

• Questions about close cache events and the defeat strategy "ALL".

  I use near cache, and try to determine what defeat strategy would be better for me. My cards before being highly volatile, I'm considering strongly using the strategy of "EVERYTHING" for at least some of my caches.
  
  This brings me some questions about the event cache stream closely when the strategy using ALL:
  
  (1) should I expect an event to be published from the back cover when an element is added? (i.e. putAll() called cache before)
  (2) should I expect an event to be published from the back cover when an item is deleted? (i.e. remove() called cache before)
  (3) should I expect an event to be published from the back cover when an element is expelled from the rear because of size constraints?
  (4) should I expect an event to appear from the back cover when an element is expelled from the rear due to the expiry?

  Hi Tom,

  near cache before cards do not store the entries inserted in the back cover, so if you have saved a listener on the front plane, you will get the notification to the listener on the plan before all the inserts in the back cover of other nodes.

  It's a little different for entries that have been asked by the local node through the near cache (not directly on the distributed back cache). If the cache almost didn't get call so far, then they will not go into the front plane, so it's the same as if inserted directly into the back cover. It is the starting of the near cache behavior. After the first EEG puts will be cached in the front plane. Once that puts is cached in the front plane, then the listener before card will see put through the cache close to the same node, but not of other nodes.

  Also, the cache near registers a listener lite, so it becomes not the input values changed, as the keys.

  A listener that you entered on the back cover will see each insertion, if you do not save a MapEventFilter or a MapEventTransformer custom with the listener. A MapEventFilter can filter inserts away (I think, the cache similar to that, too).

  Best regards

  Robert

• 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

• A few questions about the upgrade on Satellite A300-144

  Sorry for the typos, English is not my mother tongue.
  I want to ask some questions about the upgrade of a300-144.

  * Some info first.*

  CPU: T2370 ([http://ark.intel.com/products/34445/Intel-Pentium-Processor-T2370-1M-Cache-1_73-GHz-533-MHz-FSB]).
  Chipset: GM965 ([http://ark.intel.com/products/29821/Intel-82GM965-Graphics-and-Memory-Controller]).

  * Questions.*

  1. my frequency of laptop memory at 533 MHz, supports 667 MHz memory controller, memory modules can work at 667 MHz. Is - this because CPU FSB 533 MHz frequency and new processor at 667/800 MHz FSB will fix it or it is hardcoded in the BIOS?

  2 Intel said that the size of max memory for my chipset is 4 GB (2 x 2 GB), but Toshiba says that only 2 GB (2 x 1 GB), who is right?

  3 I know, taken of my CPU is μFCPGA-478 aka socket P, max FSB 800 MHz, max 35 W TDP, so T9500 ([http://ark.intel.com/products/33918/Intel-Core2-Duo-Processor-T9500-6M-Cache-2_60-GHz-800-MHz-FSB]) is a compatible processor or there are some limitations in the BIOS?

  > 1. My frequency of laptop memory at 533 MHz, supports 667 MHz memory controller, memory modules can work at 667 MHz. Is - this because CPU FSB 533 MHz frequency and new processor at 667/800 MHz FSB will fix it or it is hardcoded in the BIOS?

  The speed of the memory is related on the material. This means that the FSB is responsible for the limitation.
  If the FSB would allow support 667 MHz then the memory would also at this speed.

  > 2. Intel says that the size of max memory for my chipset is 4 GB (2 x 2 GB), but Toshiba says that only 2 GB (2 x 1 GB), who is right?
  The memory depends on the chipset. So if the chipset supports 4 GB of RAM, you should be capable of this move to 4 GB of RAM

  > 3. I know, my CPU is? FC-PGA-478 aka socket P, max FSB 800 MHz, max 35 W TDP, so T9500 (http://ark.intel.com/products/33918/Intel-Core2-Duo-Processor-T9500-6M-Cache-2_60-GHz-800-MHz-FSB) will be a compatible processor or there are some limitations in the BIOS?

  It might be possible that the new processor would be fully supported by the BIOS, but in most cases it should not be a problem if the chipset would support the new processor.
  But as far as I know the upgrade of the CPU is not supported by Toshiba or any other manufacturers of portable and its your own risk to run laptop with the new processor.