Redo log switch always calls the control point?

Similar Questions

• 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

• Why redo log is displayed in the area of flashback?

  According
  
  documentation on Oracle managed file under Administration of the Oracle database
  
  http://download.Oracle.com/docs/CD/B19306_01/server.102/b14231/OMF.htm#sthref1534
  
  He said very clearly
  For the creation of redo log files and files of control only, this setting overrides any default location specified in the DB_RECOVERY_FILE_DEST and DB_CREATE_FILE_DEST initialization settings.
  
  I did the check to the top as follows
  
  SQL > select Member from v$ logfile;
  
  MEMBERS
  --------------------------------------------------------------------------------
  /U01/app/Oracle/oradata/TOMKYTE/onlinelog/o1_mf_3_4kx4wdld_.log
  /U01/app/Oracle/flash_recovery_area/TOMKYTE/onlinelog/o1_mf_3_4kx4wto6_.log
  /U01/app/Oracle/oradata/TOMKYTE/onlinelog/o1_mf_2_4kx4vjcs_.log
  /U01/app/Oracle/flash_recovery_area/TOMKYTE/onlinelog/o1_mf_2_4kx4vyjt_.log
  /U01/app/Oracle/oradata/TOMKYTE/onlinelog/o1_mf_1_4kx4tn4n_.log
  /U01/app/Oracle/flash_recovery_area/TOMKYTE/onlinelog/o1_mf_1_4kx4v26y_.log
  
  -to verify the location of the recovery logs.
  
  
  
  SQL > show parameter db_create_online
  
  VALUE OF TYPE NAME
  ------------------------------------ ----------- ------------------------------
  db_create_online_log_dest_1 string/u01/app/oracle/oradata/TOMKYT
  E/onlinelog
  db_create_online_log_dest_2 string/u01/app/oracle/oradata/TOMKYT
  E/onlinelog
  
  -to check where they are supposed to be written
  
  SQL > show parameter db_recovery_file_dest
  
  VALUE OF TYPE NAME
  ------------------------------------ ----------- ------------------------------
  db_recovery_file_dest string/u01/app/oracle/flash_recovery
  _area
  whole large db_recovery_file_dest_size 2G
  
  -to check where is the flashback recovery area.
  
  I know if they are immediate or not parameters
  
  SELECT name, value, issys_modifiable of the parameter $ v = name: v_param_name';
  
  all the above mentioned parameters are all immediate, it will change immediately without having to restart the server.
  
  Why is my recovery connects to two different places when there's only one place?
  
  I am currently practicing the concepts in the required Oracle workshop and hope to have a successful learning.
  
  Thank you very much!

  OK, when you set the db_create_online_log_dest_n parameters, you don't need to bounce the DB, they immediately change, but is not means that newspapers in restoration online will change location, this means that when you create new logs in restoration online they will be created in the new destination. When you created the db with dbca, db_create_file_dest and db_recovery_file_dest parameters have been defined, then online redo logs are created on the two sites, this is the documented behavior (http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/omf.htm#i1206224). If you set the db_create_online_log_dest_n, not to refer to "/onlinelog", these directories will be created by Oracle under the standard of the OFA.

  HTH

  Enrique

• No pen or the control points lightroom radial filter 5

  No pen or the control points lightroom radial filter 5

  Press H

• Many redo logs switches the line seconds on an irregular basis

  Hello

  We are 11 GR 2 RAC. We migrated a DB 10 g that used to pass on every 20-25 minutes all the

  While doing about 160 to 200 GB per day; I noticed this newly migrated DB now show

  pics of quick saves switches from time to time, for example yesterday (excerpt):

  SQL > select thread #, FIRST_TIME from v$ log_history by 2;

  ...

  1 20140524 10:19.36
  1 20140524 11:24.34
  2 20140524 11:24.35
  2 20140524 12:00.02
  1 20140524 12:00.03
  1 20140524 12:00.05
  2 20140524 12:00.08
  1 20140524 12:00.14
  1 20140524 13:06.19
  2 20140524 13:09.44
  2 20140524 14:15.46
  1 20140524 15:00.08
  2 20140524 15:00.50
  2 20140524 15:53.56
  2 20140524 16:45.37
  1 20140524 16:45.39
  2 20140524 17:43.26

  Ignore lines because of lunch at this time that I start a backup of archive logs, but to explain

  switches 11:24.34 et.35 for example, or 15:00.08 et.50, then at 16:45, where

  Do you think I should study? I have no reason why in these moments my DB suddenly

  give 3 GB of Oder, before you wait another hour to do this (e.g. between 16:45 and 17:43)...

  Everything about the fact that we are on CARS now?

  Thank you very much.

  Kind regards

  SEB

  Nothing to worry about.

  Each node in a RAC has it of own redo logs and performs his own logswitches.

  If you look for each thread (1 and 2 that correspond to the node) itself, everything is ok.

• Bandwidth of the network for the redo log switches

  Hi all

  I'm using Oracle 11 g R2, I want to clarify the necessary bandwidth of my primary site to the secondary site (using Oracle Data guard)

  My database is an Oracle RAC 2 nodes each node has a log size to 2 GB again. listen to this file in operation every 5 minutes. It means that I'm spending a 2 GB redo log file every 5 minutes from each node. This means that 4 GB in total every 5 minutes.

  I'm planing to set up Oracle Dataguard in maximum performance mode. Is that mean I need a link between the primary and secondary site that is able to transfer files of 2 GB + 2 GB every 5 minutes?

  I do the calculation below and need your advice:

  4 GB / (5x60s) = 13981 KByte/s

  This means that I need to link to 13981x8bites/s = 111, 848Kbit/s?

  Is the above correct? your advice please

  Kind regards

  Please check below two

  http://www.Oracle.com/au/products/database/MAA-WP-10gR2-dataguardnetworkbestpr-134557.PDF

  How to calculate bandwidth transfer network required recovery in care of data (Doc ID 736755.1)

• redo log switch

  11 GR 2
  Discovered newspaper spent all the minutes (2, 3 minutes) at peak periods. I'll make the recommendation for the largest newspapers of recovery such as switches will be every 20 to 30 minutes.
  Wanted to know what would be the negative side of the great redo logs?

  You have the active setting FAST_START_MTTR_TARGET? If you have it, you can use the Redo size for the log file Advisor who can tell you the right size for them for your redo log files. In addition, you can set parameter archive_lag_target while fixing a large size for her redo log files.

  Aman...

• Flatten the control point handles

  Hi Expert Adobe and types of charitable :-)

  I work on a certain type at the moment and wanted to use the anchor points and handles control as an effect in the final work.

  I tried to use 'See the Bounding Box' after flattening of the text and made a screenshot to Photoshop.

  Using this method the anchor points are visible, but unless you select the particular anchor with the direct Selection tool,
  control handles are never visible. I must also import to Illustrator and use the tracing, which I do not think that would work very well...

  Is it possible to easily convert Illustrator guide marks and control handles at work?

  All greatefully suggestions appreciated!

  Thanks much :-) J

  I have good was at work

  The script is a bit too long to comfortably inside this message, and it seems you still cannot attach files, so download it from my site: www.jongware.com/binaries/drawArtHandles.zip

  Select one or more objects, and it will make a layer called 'Art Visible' (or use one that already exists) and all handles, anchors, bounding and whatnot boxes press. He "supports" (i.e., the prints handles) text, groups and simple traces. Gets all the rest - bitmaps, symbols, graphics... - the I am ignorant you treatment.

  (I noticed a small bug: sometimes Illustrator won't cooperate and refuses to set the color for the frame of the "bounding box".) What is happening with this? I don't know - everything else seems to be in order).

  Here's what it looks like - don't like, you have now all handles selected at the same time?

  

• 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

• 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...

• Redo logs and crash of the disk where they are stored

  What happens when the disk where the redo logs are written becomes HS (e.g., a disk crash). I read somewhere that the database be shutdown. Is this right? You can ask to copy the recovery logs at 2 locations in order to improve the security of the system?
  
  Thanks in advance,
  Alexandre Bailly

  user8716187 wrote:
  What happens when the disk where the redo logs are written becomes HS (e.g., a disk crash). I read somewhere that the database be shutdown. Is this right? You can ask to copy the recovery logs at 2 locations in order to improve the security of the system?

  Thanks in advance,
  Alexandre Bailly

  Online redo logs can and should be multiplexed, with copies on separate physical devices. The details are in the ALTER DATABASE command, found in the SQL reference Guide. Additional information can be found by going to tahiti.oracle.com, drilling until your product (without name) and version, the by using the "search" feature to find something on "restore". A lot of information in the Administrators Guide.

  In addition, default Oracle will appoint the «redo_*.log» redologs ".Log" is an open invitation to ITS s to open the with a text editor or delete. After all, 'it's just the log file I named mine by the older convention of the "redo_*.rdo" just to reduce this kind of human error.

• Issues related to the control point.

  Hello
  
  I have a doubt, checkpoint,
  
  Writing database writes data to stop data to the control files.
  
  In my view, the database writer writes only stamps Sales (which are commited buffers) in the data files. Can someone delete this
  
  
  Thnks

  user10745179 wrote:
  Hello

  I have a doubt, checkpoint,

  Writing database writes data to stop data to the control files.

  In my view, the database writer writes only stamps Sales (which are commited buffers) in the data files. Can someone delete this

  Thnks

  Yes, database writes the uncommitted to the data files. In case you long uncommitted transaction, this would mean that you have a lot of data not validated in the database buffer cache. There might come a time where all the data of the dbc is not validated, if more data must be written in DCB, no own stamp will be available to write and the cause of crashing instance. In such a situation, the dirty unvalidated data are also flushed to the data files but is not accessible until the transaction is complete, once the changes take place and other users will get the changed data.
  Kind regards
  Blabla

• Update member always calls the empty record to change

  I am certainly a noob in PHP/MySQL.  I was buy and read books, etc., but I can't get the form memberUpdate to anything except a blank when record selected in a list drop-down link after the Member of balls in return.  I followed the instructions of DW5.5 The Missing Manual a dozen times.  Even if I think I'm supposed to filter to a form variable, I played with the Recordset filter until I'm blue in the face; try URL param, variable in form and variable server - which test all fine when I click on the TEST button and enter a test value, but when I run it from the homepage through the log-in (on the homepage) for the link of the menu drop-down edit profile, it always shows empty fields, rather than that of the connected member.  Oh, I use E-mail from the Member as the primary key of the database.  Please and thanks for any help you can be.  Here is the code generated by DW PHP comes from the memberUpdate file:

  <? php require_once('.. / Connections/iama_test.php');? >
  <? PHP
  If (! function_exists ("GetSQLValueString")) {}
  function GetSQLValueString ($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "")
  {
  If (via PHP_VERSION < 6) {}
  $theValue = get_magic_quotes_gpc()? stripslashes ($TheValue): $theValue;
  }

  $theValue = function_exists ("mysql_real_escape_string")? mysql_real_escape_string ($TheValue): mysql_escape_string ($theValue);

  Switch ($theType) {}
  case 'text ':
  $theValue = ($theValue! = "")? « " ». $theValue. "" "": "NULL";
  break;
  case "long":
  case "int":
  $theValue = ($theValue! = "")? intval ($TheValue): 'NULL ';
  break;
  case "double":
  $theValue = ($theValue! = "")? doubleVal ($TheValue): 'NULL ';
  break;
  case "date":
  $theValue = ($theValue! = "")? « " ». $theValue. "" "": "NULL";
  break;
  case "set":
  $theValue = ($theValue! = "")? $theDefinedValue: $theNotDefinedValue;
  break;
  }
  Return $theValue;
  }
  }

  $editFormAction = $_SERVER ['PHP_SELF'];
  If (isset {}
  $editFormAction. = « ? ». htmlentities($_SERVER['QUERY_STRING']);
  }

  If ((isset($_POST["MM_update"])) & & ($_POST ["MM_update"] == "form1")) {}
  $updateSQL = sprintf ("setting a DAY members SET loginTime = %s, createDate = %s, password = %s, lastName = %s, firstName = %s, organization = %s, address1 = %s, address2 = %s, city = %s,"the State"= %s, zipcode = %s, renewDate = %s, memberType = %s, numbers1 = %s, telephone2 = %s, phone3 = %s, email2 = %s WHERE emailLogin = %s",
  GetSQLValueString ($_POST ['loginTime'], 'day'),
  GetSQLValueString ($_POST ["'createDate"], "date").
  GetSQLValueString ($_POST ['password'], "text").
  GetSQLValueString ($_POST ['name'], "text").
  GetSQLValueString ($_POST ["firstName"], "text").
  GetSQLValueString ($_POST ['organisation'], "text").
  GetSQLValueString ($_POST [' Address1 "],"text").
  GetSQLValueString ($_POST [' address2 "],"text").
  GetSQLValueString ($_POST ['city'], "text").
  GetSQLValueString ($_POST ["State"], "text").
  GetSQLValueString ($_POST ['PostalCode'], "text").
  GetSQLValueString ($_POST ['renewDate'], 'day'),
  GetSQLValueString ($_POST ["'memberType"], "text").
  GetSQLValueString ($_POST ['telephone1 "],"text").
  GetSQLValueString ($_POST ['telephone2 "],"text").
  GetSQLValueString ($_POST ['phone3'], "text").
  GetSQLValueString ($_POST ['email2'], "text").
  GetSQLValueString ($_POST ['emailLogin'], "text"));

  @mysql_select_db ($database_iama_test, $iama_test);
  $Result1 = mysql_query ($updateSQL, $iama_test) or die (mysql_error ());

  $updateGoTo = "updateSuccess.php";
  If (isset {}
  $updateGoTo. = (strpos ($updateGoTo, '?'))? « & » : « ? » ;
  $updateGoTo. = $_SERVER ['QUERY_STRING'];
  }
  header (sprintf ("location: %s", $updateGoTo));
  }

  $colname_Recordset1 = "-1";
  If (isset($_POST['emailLogin'])) {}
  $colname_Recordset1 = $_POST ['emailLogin'];
  }
  @mysql_select_db ($database_iama_test, $iama_test);
  $query_Recordset1 = sprintf ("" SELECT * WHERE emailLogin = %s MEMBER ", GetSQLValueString ($colname_Recordset1,"text")");
  $Recordset1 = mysql_query ($query_Recordset1, $iama_test) or die (mysql_error ());
  $row_Recordset1 = mysql_fetch_assoc ($Recordset1);
  $totalRows_Recordset1 = mysql_num_rows ($Recordset1);
  ? >

  Well, I found a post by Andoyo Andoyo here and it was exactly what I need, so thanks, Andoyo.  It worked the first time!  Now, I can go play with it and see where I was wrong in the other file.  BTW, here is the link to the page that has worked for me...  http://forums.Adobe.com/message/1071495#1071495

• Multiplex redo logs and slow down the e/s

  I sometimes use a San that gets saturated by a another client that I have no control over. My recovery on is newspapers the SAN and it causes all my customers to save waiting for synchronization of log file when it arrives. My overall IO is low, but customers commit frequently. In this scenario, I have no control over the San or other customer behaviours.
  
  What I'm considering is multiplexing by newspapers of recovery more fast local disk, but leaving a member of newspaper on the SAN because these discs are less likely to fail purely and simply.
  
  My question is how Oracle will behave during the SAN slows down - it will deal with the posting as 'fact' when the first newspaper finishes member in writing, or the last? I know that if writing an error then just Oracle will mark this member as dead, however in this case I get no errors, some delays.
  
  Edit: I have no control over the San or its configuration as well, I just have to work around the problem, while SAN team working on it.
  
  Published by: jhmartin1 on April 7, 2009 15:55

  Write completion wil be when more destinations slow two members signals, that Scripture is complete.

  Other thoughts.

  For a San, I expect to be when writing reaches a battery backed cache. So think of it as no adaptation write cache can be useful.
  You can increase the cache to write to your San?

  Obviously writing half as much for the san that can help.

  Make sure you use the SAME guidelines [http://www.oracle.com/technology/deploy/availability/pdf/OOW2000_same_ppt.pdf]

  Check if the problem is caused when backups are.

  Check a second time SAN and SUN firmware is up to date and ensure that best practices for san are respected etc.

  -I think that there is a problem for sun solaris I try to drag in the back of my mind by which a series of small writings are not well on the most massive. But Ithink that is direct attached tables and there is a workaround.

  HOEP this helps, bigdelboy.

• update of security - KB2538242 has been downloaded and successfully installed the thirteen times. Update always calls the installation

  I downloaded and installed successfully KB2538242 security update, thirteen times. Calls to the update and if I use auto update update end of session, the computer does not stop

  Hi joe_76,

  See the article after some troubleshooting for your question:

  http://support.Microsoft.com/kb/910339

  I hope this helps!