Question of control point

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• Oracle concepts: Clarity on the control points required

  First of all, I should mention my understanding, and then I'll raise my doubts/queries:
  
  I think I know just enough of what are the points of control and their purpose; in order to validate and to have a deeper understanding, I was going through section "Importance of control points for example recovery ' chapter 'Instance of Oracle database' of ' 11 g Release 2 Oracle® database Concepts'.»
  -Oracle link Docs
  http://docs.Oracle.com/CD/E11882_01/server.112/e25789/startup.htm
  
  Now I need some clarification on the mentioned content there.
  
  I knew that control points are used to ensure that the control file and data files are synchronized and and it is a point where recovery instance is required, doc Oracle he mentions as a control point position.
  
  First question:
  I see many types of checkpoints mentioned here as put on checkpoints, Tablespace and data files checkpoints and additional checkpoints, I tried to get that said, can anyone make it a little clearer to me in simple terms?
  
  Second question:
  In the Oracle RAC environment, there are several threads to redo (one for each instance), how recovery Instance that happens? It is not clear to me, I want to say how serialization between multiple threads to roll forward to retrieve one or more has no instances?
  
  Kind regards
  Ankit Rouault

  NVO wrote:

  First question:
  I see that many types of checkpoints mentioned here as put on checkpoints, Tablespace and control points data files & additional checkpoints, I tried to get that said, can anyone make it a little clearer to me in simple terms?

  The term "checkpoint" has changed meaning over time. The original meaning was close to your description - a control point has allowed Oracle to determine that all blocks of data changed before a specific point in time (SNA) was written on the disc - however there are has reasons why Oracle might want to make sure that a specific blocks of data modified subset had been written on the disc and that's why the checkpoint term has expanded to cover the options such as a checkpoint of tablespace, or a checkpoint of object reuse. For example - if you truncate an object, then Oracle must copy everything puts in buffer for just that object on the disk before making the data dictionary and the space of management changes which perform the truncate (where the control point"reuse of objects '").

  Second question:
  In the Oracle RAC environment, there are several threads to redo (one for each instance), how recovery Instance that happens? It is not clear to me, I want to say how serialization between multiple threads to roll forward to retrieve one or more has no instances?

  All active instances in a RAC system will be constantly chatting to each other on the network and via the control lead - as soon as any instance think of another instance has failed, it will try to acquire exclusive global "recovery lock" - on the top of my head, I think it's the lock of the IR. When he arrives this lock, all other cases knows that there is a body controlling a recovery. Indeed the instance that got the blocking takes on the identity of the instance failed to recover through its newspapers online redo - obviously the process are much more complex than that, but it's probably a good starting point for an answer to your question.

  Concerning
  Jonathan Lewis

• Confusion of the control point

  IM on 11G R2... RHEL5
  
  First done some DML for users tablespace then made offline... my question is if datafile 4 it is users ahead of time with the issue of control, then CHANGE the VERIFICATION SYSTEM, is it the DBWR who has updated the header of data file for other data files or it was CKPT?
  
  SQL > select file #, status, CREATION_CHANGE #, CHECKPOINT_CHANGE #, BLOCK1_OFFSET from v$ datafile;
  
  STATUS # CREATION_CHANGE # CHECKPOINT_CHANGE # BLOCK1_OFFSET
  ---------- ------- ---------------- ------------------ -------------
  1 7 2009050 8192 SYSTEM
  2 2164 2009050 8192 ONLINE
  3 ONLINE 752002 2009050 8192
  4 18243 2009108 8192 OFFLINE
  5 782771 2009050 8192 ONLINE
  6 898483 2009050 8192 ONLINE
  7 1065945 1066291 8192 ONLINE
  8 1175098 1176267 8192 ONLINE
  
  8 selected lines.
  
  SQL > alter tablespace users online.
  
  Tablespace altered.
  
  SQL > select file #, status, CREATION_CHANGE #, CHECKPOINT_CHANGE #, BLOCK1_OFFSET from v$ datafile;
  
  STATUS # CREATION_CHANGE # CHECKPOINT_CHANGE # BLOCK1_OFFSET
  ---------- ------- ---------------- ------------------ -------------
  1 7 2009050 8192 SYSTEM
  2 2164 2009050 8192 ONLINE
  3 ONLINE 752002 2009050 8192
  4 ONLINE 18243 2009126 8192
  5 782771 2009050 8192 ONLINE
  6 898483 2009050 8192 ONLINE
  7 1065945 1066291 8192 ONLINE
  8 1175098 1176267 8192 ONLINE
  
  8 selected lines.
  
  SQL > change of check point system;
  
  Modified system.
  
  SQL > select file #, status, CREATION_CHANGE #, CHECKPOINT_CHANGE #, BLOCK1_OFFSET from v$ datafile;
  
  STATUS # CREATION_CHANGE # CHECKPOINT_CHANGE # BLOCK1_OFFSET
  ---------- ------- ---------------- ------------------ -------------
  1 7 2009155 8192 SYSTEM
  2 2164 2009155 8192 ONLINE
  3 752002 2009155 8192 ONLINE
  4 18243 2009155 8192 ONLINE
  5 782771 2009155 8192 ONLINE
  6 898483 2009155 8192 ONLINE
  7 1065945 1066291 8192 ONLINE
  8 1175098 1176267 8192 ONLINE

  Its the DBWR who will write changed data and that the data file would update the number of control point to reflect the last checkpoint tablespace.

  Aman...

• Ground control point and of the CNS by using process DBWr and LOGWr?

  What control point has to do with the log writer process I don't get exactly?...
  
  As I fire 1 query updated and apparently it will generate some redo blocks which in turn will come to my redo log files now in this cycle where the control point will occur and why?
  
  (1) my update query
  (2) lock
  (3) generate redo
  (4) generate cancel
  5 blocks) are changed, but they are still in the redo log buffer...
  
  Now this block finally comes to redo logs in all this way to check off pointing place and why?
  
  control point takes place also however is flushed to the data files the same reason why?
  
  Same manner around the same question the checkpointing should do with the DBWr process as I'm unclear...
  
  -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  Apart from this overview of the SNA is generated when the user launches period... and we can say YVERT can be used to identify whether or not the transaction is validated. ?
  So what is the reason for the SNA update in the control file... Can b to get the last transaction committed... ??
  
  Sorry a thread with questions so much... but this all things create a blurry image, I want to clearly say thnx for your help in advance...
  I've read the documentation, but they did not mention deep for recovery... ??
  
  
  
  Thank you
  Philippe
  
  Published by: 851733 on April 12, 2011 07:57

  And you the chance to read the guide to the Concepts and the book, Expert, alone that I proposed to read? I guess no, no? You mean, you have to read two books for sure because it would take a lot of time before you would get things correctly.

  YVERT is a like a timestamp which oracle maintain separate trasactions of time?

  Evil. CPN is with each operation, whether a DML, select, DDL, whatever it is. It's time, that's all. Validation of a transaction would be just another event that will be mapped to the SCN generated right here.

  Checkpoint is a SNA during which we emptied all Sales buffers to disk?

  Have you read in my last response I mentioned CPN is to read-consitancy and checkpoint is for the recvoery? So, how you said that this point of control is nothing other than RCS? See the definition of the Concepts guide,

  A data structure that marks the position of the control point, which is the RCS in the thread again where instance recovery should begin. Control points are recorded in the control file and each file header data and are a crucial part of the recovery.

  So assuming that the roll forward flow is as below,

  Begin - Checkpoint - end

  The point where the word Checkpoint is mentioned, is the place where begins the recovery.

  Control files and headers of the data files are updated with the last control point (now this checkpoint is the last SNA by what buffer cache is empty so that we can know up to what our data files are updated).

  Read the above, given the definition of the control point.

  Buffers are marked with YVERT?

  Don't know what you mean by this statement?

  Tell you what, read the guide concepts and Experts, by Tom Kyte to understand these things in a way much better. Besides, if you can organize, attend the session for workshop-1 or 2 modules of Oracle University, where the instructor would release these questions into a long discussion, very strongly suggested that with the above mentioned books.

  Aman...

• When I try to access the windows Defender it says operation has been cancelled due to restrictions in effect on this computor. I think I uninstalled the control point

  I went to the windows Defender to change visual effects to take into account what was best for the performance. Now when I try to access windows Defender it says this operation has been cancelled due to restrictions in effect on this computer. Contact the system administrator. I tried to do a system restore, and looks that I uninstalled windows defender control point. What should I do

  Hello gailhorne,

  Do you have any antivirus software installed?  Please visit the link below and let us know the status.

  running windows Defender but receive error message that this operation has been cancelled the restrictions in effect on this computer

  http://answers.Microsoft.com/en-us/protect/Forum/protect_scanning/trying-to-run-Windows-Defender-but-get-error/6969e099-6c42-47B5-ADC5-18804bce3cb6

• Control point

  I get a message asking if point of security control may make changes to the boot hard disk. As I don't use it I want to uninstall it, but can't find it in any list of program. Any help appreciated

  Hello Spindlewoody,

  You don't list what operating system you are using, so the steps may very

  1. click on start or the ORB start

  2. click in the search box or the execution option

  3. type msconfig

  4. Select the application in the list or click ok

  5. Select the Startup tab

  6. check if the security control point is listed if it is uncheck and reboot your computer

• (Dell Latitude E6400) Windows 7 64 bit Dell control point

  I installed Windows 7 64 bit on my Latitude E6400. I can't find any way to install the Dell Control Point. I got the Pack of drivers to install. I found a single download of the Security Manager who has worked, but I would like to than the power one Manager.

  I looked on this forum a few times and all the links I click redirect just me at the page downloads and drivers. I get an error saying that my service pack is not supported... I'm on Windows 7 Service Pack 1. I have also some 32-bit errors, but it's my fault to have downloaded the 32 bit version.

  Someone has a link to the full package of checkpoint Dell (Power Manager, Manager of connections, Security Manager) that works on Windows 7 64 bit?

  Thank you

  -Ryan

  parrotrpg1

  Here is a good article on reimage the Latitude E6400

  downloads.dell.com/.../Latitude%20E-Family%20%20Mobile%20Precision%20Re-Image%20How-To%20Guide%20-%20A03%20Rev%203%200.pdf

  Win 7 Control Point System Manager files are a little hard to find, but they can be downloaded from the following link.

  www.dell.com/.../DriverFileFormats

  This will help you if you have installed the drivers in the correct order.

  TB

• Cisco Multicast - problem of Cluster control point

  Hi all

  Now I've been troubleshooting an issue where in my security team in which they are unable to form a cluster with two devices of control point. (internal interfaces E1 on both).

  They told me that the cluster Protocol (CCP) uses multicast to form a cluster.

  Two internal interfaces are connected to my core of the switches (FEX) which are two Nexus 5Ks, which I think has some limitations regarding multicast transmissions (Please correct me if I'm wrong)

  From the online support literarure, I learned to know that disable the IGMP snooping on the switch Cisco Nexus Core is a workaround.

  My query is, is there any special way from PRI? If I disable the IGMP snooping it will affect all other areas of my network?

  Thanks in advance.

  I prefer to use IGMP snooping as planned, i.e. with an IGMP applicant if there is no Layer 3 interfaces with PIM.

• Control point for endpoint connect is compatible with Windows 8.1?

  Original title: CheckPoint endpoint connect

  Hello

  I'll do the upgrade of Windows 8 Pro for Windows Pro 8.1.

  By choosing the upgrade path that allows me to keep all the files, settings and applications, it shows that the only application that I have to uninstall will be Checkpoint Endpoint Connect (which currently runs under Windows 8 Pro).

  At all known installation CheckPoint EndPoint Connect on Windows Pro 8.1 and installed successfully?

  Thanks for the reply.

  I've went ahead with the installation of Windows RTM 8.1 and took the risk that Checkpoint would not be compatible.

  I was able to uninstall Checkpoint, as part of the upgrade of Windows 8.1 window and subsequently install Checkpoint endpoint connect successfully.

  Therefore, I am happy to say that for our Organization and our version of the control point, it is looking like it is fully compatible with Windows 8.1.

• Confused about "additional control Points.

  Hello

  I'm confused about this sentence from database Concepts 11g Release 2 (11.2)

  Additional control points

  An additional control point is a type of thread control point in part intended to avoid writing a large number of blocks online redo log switches. DBWn checks at least every three seconds to determine if he has to do. When DBWn written stamps Sales, it advances the position of the control point, causing CKPT write the position of the control point to the file control, but not for data file headers.

  I thought that a checkpoint is written datafileheader and controlfile, this happens for example after a switch logfile - right?

  So, why not in the case of additional control point? For best performance?

  Additional control points to reduce the time to recover, as more data is committed to the files of data, right?

  Concerning
  Christian

  efa78257-b5f4-4db1-8222-007be18d15aa wrote:

  Hello

  I'm confused about this sentence from database Concepts 11g Release 2 (11.2)

  Additional control points

  An additional control point is a type of thread control point in part intended to avoid writing a large number of blocks online redo log switches. DBWn checks at least every three seconds to determine if he has to do. When DBWn writes buffers of Sales, it advances the position of the control point, causing CKPT write the position of the control point to the file control, but not for data file headers.

  I thought that a checkpoint is written datafileheader and controlfile, this happens for example after a switch logfile - right?

  So, why not in the case of additional control point? For best performance?

  Additional control points to reduce the time to recover, as more data is committed to the files of data, right?

  Concerning
  Christian

  There are many types of control points. One that will be updated on the headers of data files would be a complete control and would be applicable to the entire base. The additional control point is induced to keep on enhanching a counter that would ensure that only certain limited stamp Sales would be recovering. That's why a moment of the additional control point, data file headers are not being updated. Control file is probably updated with a "pointer to disk" which mentions the point up to which the dirty buffers are written in files (from the buffer cache) data and where to start the recovery, if necessary. Log file switch will cause a thread control point which, for one instance, would be considered a Global checkpoint only. The additional control point would be for various other reasons such as setting a value for the parameter Fast_Start_Mttr_Target etc.

  HTH

  Aman...

• Did not push the file control point (no space available on the device)

  Hello

  I use Proliat HP DL 380 G5.  8 GB (RAM) 61 GB of space

  (RAID0 + 1) second HARD drive has failed while working on a HARD drive at the moment...

  After 20-25 minutes, I can't ping my VM OS which is Windows 7 (active)... and events, I see this error...
  Did not push the file checkpoint at 05:00 (no space available on the device).

  Details of the event:
  	Type: error Description: Error message on WINDOWS-PRTG on localhost.localdomain ha-Datacenter: impossible to reach 5.3 GB of file control point: no space is available on the device. Time: 09/12/2015-10:05:31
  Error stack:
  	Did not push the file checkpoint at 05:00 (no space available on the device). Failed to prepare the file ' / vmfs/volumes/56653def-ccd90fc3-0a42-001b783701ae/WINDOWS-PRTG/./WINDOWS-PRTG-f1e094f5.vmem ': 28 (no space available on the device). An error occurred during registration: 28 (no space available on the device). Impossible to suspend the virtual machine: msg.suspend.error.SUSPEND_E_NOSPACE.
  Additional event details:
  	Type ID: error Build host: 3029758 Target object Type: ComputeResource Type of data center: data center The host object type: HostSystem VirtualMachine object type: VirtualMachine ChainId: 201

  Could you help me solve this problem?

  Thanks in advance

  * Note * I found the solution... Before I used the system of virtualization and Citrix (XENSERVER) there was little different. That's why I'm stuck on a few easy steps... Well, the problem was that I use 61GB HDD, 5.5 GB of memory. When I create the VM I "ve used the maximum size of HARD drive and left no space for the SWAP file. I used 58 GB, and you have to assume + memory size, this means, 58 GB + 5.5 GB...   So who is right for which I didn't have enough space. Hopefully someone will find it useful. See you soon,.

• Redo log switch always calls the control point?

  Hello

  Is a log switch redo always calls process checkpoint?

  I have a database of test on which nothing is not running, but when I switch the redo log file, so it takes time to make the State of redo log active to INACTIVE.

  But when I change check system; the State immediately changes from ACTIVE to INACTIVE.

  Gives me a feeling that the redo log switch, it is not mandatory for the checkpoint occurs.

  DB version is 11.2.0.1

  Comment of nicely.

  A 11.2.0.4 alert after log is 3 'alter system switch logfile' in a line:

  ALTER SYSTEM SET log_checkpoints_to_alert = TRUE SCOPE = BOTH;

  Wed Apr 16 22:17:09 2014

  Beginning log switch checkpoint up to RBA [0xd8.2.10], SNA: 12670277595657 *.

  Thread 1 Advanced to save the 216 (switch LGWR) sequence

  Currently Journal # 3 seq # 216 mem # 0: /u01/app/oracle/oradata/TEST/onlinelog/o1_mf_3_938s43lb_.log

  Currently Journal # 3 seq # 216 mem # 1: /u01/app/oracle/fast_recovery_area/TEST/onlinelog/o1_mf_3_938s49xz_.log

  Wed Apr 16 22:17:25 2014

  Beginning log switch checkpoint up to RBA [0xd9.2.10], SNA: 12670277595726 *.

  Thread 1 Advanced to record the sequence 217 (switch LGWR)

  Currently journal # 1, seq # 217 mem # 0: /u01/app/oracle/oradata/TEST/onlinelog/o1_mf_1_938s3lbv_.log

  Currently journal # 1, seq # 217 mem # 1: /u01/app/oracle/fast_recovery_area/TEST/onlinelog/o1_mf_1_938s3nmc_.log

  Wed Apr 16 22:17:36 2014

  Thread 1 cannot allot of new newspapers, sequence 218

  Checkpoint is not complete

  Currently journal # 1, seq # 217 mem # 0: /u01/app/oracle/oradata/TEST/onlinelog/o1_mf_1_938s3lbv_.log

  Currently journal # 1, seq # 217 mem # 1: /u01/app/oracle/fast_recovery_area/TEST/onlinelog/o1_mf_1_938s3nmc_.log

  Wed Apr 16 22:17:40 2014

  Checkpoint completed up to [0xd8.2.10], YVERT RBA: 12670277595657 +++

  Beginning log switch checkpoint up to RBA [0xda.2.10], SNA: 12670277596242 *.

  Thread 1 Advanced to record the sequence of 218 (switch LGWR)

  Notice how we have lines (marked *) what does "beginning log switch checkpoint."

  However, note that control points are not "emergency" until we have a problem with "checkpoint is not complete", and the first control point in the bucket fill in only some time after the second control point in the dumpster.  Log switch checkpoint he still 'place' (or, at least, its necessity is noticed) - but it is not the urgent case where it used to be in early versions of Oracle.

  Concerning

  Jonathan Lewis

• In what order are anchor command left and right control point values returned by entirePath()?

  The entirePath() returns the anchor points that have two values, or it returns an array with three coordinates. I would like to know, in this case, what is the point of anchorage, control point index and values of point of order from right to left?

  The three values are leftDirection, the point of anchorage and directed. 'leftDirection' and 'directed' compete in the competition for the worst property names, because they have nothing to do with the left and right. Publishers of fonts and other programs that deal with the use of the perfectly transparent Bezier curves "in" and "out." These words make sense. Adobe of not.

  To find out what values stand for, draw a simple curve with three points, then use a script to write the values to the console of the ESTK. Open the transform Panel and check the values it that that you printed in the console.

  A major problem in all of this, is that when you select a point with the direct Selection tool, app.selection [0] does not return this point (I forget now what it returns) and get a handle on a selected point is an ugly hack.

  Peter

• Don't vSphere replication create control points which can be selected during the failover?

  Don't vSphere replication create control points which can be selected during the failover?  Or is the latest version of replication, the only option to failover?

  Thank you

  -MattG

  No, this isn't

  You CAN do this with EMC RecoverPoint (although not on a per VM level).

• hot flashes control point transaction log

  Hello
  Is there a way of hunting/purge the transaction logs, other than to drop the schema for replication?
  
  Published by: 899967 on November 27, 2012 12:52 AM

  If the logs are kept even after the two control points, so it is because they are required for replication. This means either that replication is not working or is it falling far behind. Newspapers to be served in a number of ways that you can do, but it will lose all pending transactions and replicas will be out of sync. You can then choose a replica as the "golden master" and re-instantiate copies which form using ttRepAdmin - duplicate.

  The two ways to "purge" the newspapers are:

  1. stop the repagent and then slide the replication scheme. Recreate the schema, restart the repagent, drop each Subscriber and reinstantiate the use ttRepAdmin - double.

  2. use ttRepAdmin to define the "State" of the flow of replication from the node with logs accumulated at each Subscriber to 'stop '. Drop each Subscriber, then re-instantiate then using ttRepAdmin - duplicate.

  (2) If a single subscriber results in the accumulation of journal you can apply it selectively to just this Subscriber.

  Chris