Data Guard Performance: apply Lag

Similar Questions

• Can a weird question we use Data Guard to apply the bidirectional log?

  Hi I have a question about Data Guard, can we use Data Guard to apply the bidirectional log? I mean keeping the two of them primary and standby to Active status (read write Mode).
  
  Maybe my question seems silly, but I just wanted to check on it.
  
  Thank you

  Laughing out loud

  That Golden Gate or water courses that will work in two ways. One or the other. Puts additional requirements on the hardware is the downside.

  Data Guard does not do that.

• Data Guard can apply to a single schema

  We want to test the Data Guard feature to our customer. While with space limited in the catchment area, management wants to apply Data Guard for an instand little test of the entire database schema. I don't think it is possible newspaper archive sent and applied to the wait, those redo entries involving that another data schema will cause the error.
  
  Just want to confirm that my thinking is correct.

  Hello

  You are right, it is not possible to have dataguard for unique schema, you can use it to any database.

  Outside the trial, if you want to have the replication of a set of tables or diagrams instead of the whole base then you can use golden gate for that.

  I will recommend you to create a new DB test and test dataguard on it.

• issues of database after the start of the Data Guard

  Hello. We run OEM12c in Linux. Everything works well and we are monitoring several DBs targets.

  On our server of db QA, sun solaris 11 running oracle 10 g, we have started to test the configuration of data hold for several instances that we run it. our standby server is called STDBY. Everything works fine, but now we have a problem of management of some aspects of the custody of the data with OEM12c.

  First problem is that bodies appear as SID_IPaddress of the server, and not as DB_UNIQUENAME. DB_DOMAIN. Oddly enough, the std by copy, displays correctly (SID_sbyp.db_domain)... It's very confusing...

  Second problem is when we try to access the Data Guard performance pane, it fails showing (both in primary and secondary DBs)

  Data Guard internal error: see the log of the WHO for more details.

  No idea where to look for this problem.

  All other functions, TOP, performance at home, etc... look good.

  Hello

  On the question «bodies appear as SID_IPaddress of the server, and not as DB_UNIQUENAME.» DB_DOMAIN', you can use the solution to rename the target name desired using below doc MOS

  How do I rename managed targets in Enterprise Manager Cloud control 12 c (Doc ID 1515413.1)

  Kind regards

  Rahul

• How to move from Data Guard time really apply (restore) to archive the journal

  Hello
  
  Standby database configured with broker and application really remake in time; However, I want to change it to archive the journal apply mode without losing the broker configuration. Is this possible? If it is not possible to use the broker to make archive log apply, I can remove the broker and use Data Guard to set up the day before to use the archive log apply?
  
  Concerning

  Hello;

  Broker automatically allows real-time applies to databases on hold if the standby database has standby redo logs configured.

  Stop repeat applies

  DGMGRL> EDIT DATABASE 'PRIMARY' SET STATE='APPLY-OFF';
  

  Repeat restart applies broker

  DGMGRL> EDIT DATABASE 'PRIMARY' SET STATE='APPLY-ON';
  

  In order to get rid of standby redo logs would be a way. I would like to leave myself alone. Real time assistance to prevent the loss of data.

  Best regards

  mseberg

• Reliable message of guard - performance issues - of the data?

  Hello, we are on 10.2.0.3 (I know, time to upgrade, just can't right now). Data Guard is in place, in AVAILABILITY of maximum production work that was ongoing for 3 years once a week with no problems started taking 10 + hours. He used to take 2 hours Max checked, everything, nothing has changed. Ran AWR report and see that the high wait event is a RELIABLE MESSAGE:
  

  Top 5 Timed Events 
  
  Event Waits Time(s) Avg Wait(ms) % Total Call Time Wait Class 
  CPU time   45,270   97.5   
  *reliable message 2,655 534 201 1.1 Other*
   db file sequential read 199,278 366 2 .8 User I/O 
  db file scattered read 122,914 287 2 .6 User I/O 
  LGWR wait on LNS 35,511 209 6 .4 Network 

  Is - this Data Guard? What can we do to fix this? I dropped the day before, tried to re - run this job and still have high reliable message:
  

  Top 5 Timed Events 
  
  Event Waits Time(s) Avg Wait(ms) % Total Call Time Wait Class 
  CPU time   11,490   98.7   
  reliable message 804 77 96 .7 Other 
  db file scattered read 92,969 34 0 .3 User I/O 
  db file sequential read 17,596 25 1 .2 User I/O 
  log file parallel write 13,268 11 1 .1 System I/O 

  I don't understand much about Metalink. If I dropped the day before, newspapers are not speeding it more, shouldn't that have improved performance? Or should I disable the configuration to test any scenario Data Guard in this case? In the last configuration disabeling required re-buillding DG however. Please notify. What is the reliable message? Thank you!

  My bad. You are right, they are 10MB.

  I have galanced bytes and somehow added an extra 0.

  The 200 MB comes from the query - 'optimal_logfile_size = 201.

  The rule of the 20 minutes of CKPT is good, but sometimes the databases have a peak period, which is only about half a day.

  10 MB is a bit small, I consider what makes them great. At least 100 MB.

  I remember you, you had the 'Data Guard - total loss of primary education"question just now.

  Best regards

  mseberg

• Repeat applies without using Data Guard

  Hello everyone,
  
  I would like to redo apply to a database of pending. Unfortunately, the DB's standard edition for Data Guard is not an option. Is there documentation on how to achieve something like the roll forward apply without using Data Guard?
  
  Kind regards
  Frank

  There are a lot of threads on this same forum on this specific topic.
  Please use the search (top right of page), and see the list of threads returned:
  https://forums.Oracle.com/forums/search.jspa?threadID=&q=%2Bstandby+%2Bstandard+%2Bedition&objid=F61&DateRange=all&userid=&NumResults=15

  Nicolas.

• Archiving logs apply frequency in Data Guard

  Dear all,
  
  How can we verify/set up the frequency archive newspapers should be applied to the Data Guard?
  
  Version: 10 g 2; OS: Windows 2003 R2 (64-bit).

  How we can configure the frequency of archive logs must be applied to the DG?

  Erase the question once more what you're expecing, as I understand, it's...

  It depends on the Redo genearation / Archive primary & network latency between primary databases & Eve.
  There is a configuration, you can change in the primary to put options such as delay , net_timeout and so on.

  consult this manual too.
  http://download.Oracle.com/docs/CD/B28359_01/server.111/b28294/log_arch_dest_param.htm

• Automatic failover with Transport and apply Lag fails with ORA-16798

  Hello
  I configured a physical database maximum Performance, accelerated failover mode standby. I set FastStartFailoverLagLimit to 3 hours (10800 seconds).

  If I understand the Oracle documentation, Fast-Start failover should work with Max Performance, as long the Transport timeout is whithin the FastStartFailoverLagLimit.

  
  So I started a few scripts, generated some loading, so I have a Transport and apply the shift of 3-4 Minutes.
  Then I killed pmon to cause an automatic failover.

  Failover failed with ORA-16798.

  I know, there is Note 846087.1 , which describes the problem, but I thought that automatic failover should work in this configuration.
  Is this a bug or am I wrong?

  Thank you very much in advance.

  
  Configuration Data Guard standby:
  -----------------------------------------------

  Role: STANDBY PHYSICS
  State of destination: apply
  Transport delay: 3 minutes 3 seconds (calculated two seconds ago)
  Apply the Lag: 3 minutes 26 seconds (calculated 0 seconds ago)
  Apply the rate: 23,52 MB/s
  Real-time query: OFF
  Occurrence (s):
  ...

  Properties:
  ...
  LogXptMode = "async".
  DelayMins = '0'
  Binding = "optional."
  MaxFailure = '0'
  MaxConnections = '1'
  ReopenSecs = "300"
  NetTimeout = "15"
  RedoCompression = "DISABLE."
  ...

  State of the database:
  SUCCESS

  Fast failover configuration:
  -----------------------------------------------

  Fast-Start Failover: ENABLED

  Threshold: 180 seconds
  Target: < Targetname >
  Observer: < servername >
  Offset limit: 10800 seconds
  Primary closure: TRUE
  Auto-Rétablir: TRUE
  Reconnection of the observer: (none)
  Substitution of the observer: FALSE

  ...

  
  Messages of the DG - Log:
  -----------------------------------------------
  FAILOVER TO < DB >
  Starting failover to the < DB > database
  Notifying Oracle Clusterware to disassembly for the FAILOVER database
  02/02/2015-13:38:04
  Error running SQL = 604, sql = [ALTER DATABASE RECOVER MANAGED STANDBY DATABASE FI
  ORA-00604: an error has occurred at the SQL level 1 recursive
  ORA-00283: cool cancelled due to errors
  ORA-16171: RECOVER... FINISHING not allowed away for thr 1, seq 34-37
  Failed to retrieve Terminal.
  Database error resource SetState (16798)
  02/02/2015-13:38:08
  Command FAILOVER < DB > completed with error ORA-16798

  
  

  The FastStartFailoverLagLimit property specifies the amount of data, in seconds, during which the standby database target can

  delay on the main database on the recovery plan applied. If again applied Eve point database notes that many

  seconds of the primary database redo point generation, accelerated tipping is allowed.

  Errors show a gap for sequences 34-37, which is not optimal for a fast failover.

  Even if FastStartFailoverLagLimit is set to 3 hours, there is too much data loss for the standby site because newspapers are not available on the backup server and the Broker cannot activate the Pb of the day before.

  I recommend to to lean on increase the bandwidth network.

  Concerning

• Restore the size of the log in Data Guard configurations

  DB version: 11.2
  Platform: Solaris 10
  
  We have currently a DB production which is not Dataguard.It has a load of joint working: some processing OLTP and batch.
  Its size of redo log is * 100 * MB.
  
  We will create a database with the requirement very similair but this DB will have primary standby (Data guard) and real time applies.
  
  To adapt to the requirements of dataguard, we should reduce the size of the recovery online newspapers? That is to say. Transport of small pieces of roll forward is better than carrying more. Right?

  Hello;

  If you use "real-time applies" the key is not the size so that the standby Redo Logs.

  In most cases, 100 MB is fine. Newspapers to sleep again must be the same size that it again.

  With 'real time applies' SRL act as a buffer.

  Unless you have a real problem with the size of do it again I would not change it.

  An excellent source of information on this is 'Restore the Services of Transport' in ' Data Guard Concepts and Administration 11 g Release 2 (11.2) "E10700-02".

  If you believe that your logs are too big departure "Troubleshooting performance problems with the database and base/MFG MRP [ID 100964.1]"

  Best regards

  mseberg

  Published by: mseberg on May 31, 2012 11:33

• Protection Mode change Data Guard.

  Experts,
  
  Ask your entries on the Data Guard protection mode change, below, is our environment:
  
  BECAUSE with two nodes: primary
  Single stand-alone Server DB: Eve
  Apply real-time: enabled
  
  For the primary and Standby databases, it's protection guard data display "Maximum Performance" mode. According to our needs, we would go for "maximum availability". I can go ahead and change, however I have questions in mind before making the change.
  
  1. do I need to change the protection on both primary & standby mode?
  2. do on DB primary change automatically the standby mode too?
  3. If the answer is NO to the 2nd question, I need to change the mode of protection to standby also? In the otherwise, primary and Standby will be run in two different modes.
  
  Please let us know of your entries.
  
  Thank you

  Crazy.

  I'm really happy that it works. Only ORA-16198 has very little information about it.

  And its raining in the North tonight so I have to escape before it turns me on.

  Best regards

  mseberg

  Subsequently

  Is equivalent to checking. Hoping no news is good news.

  I've seen this thing before restarting. Last weekend was indeed an Oracle 10 bark at me during the installation of the entire network has been good. Another error, but I finally tried the same thing and it worked also. No complete sense to me, you would think that the listener would govern. And then it takes the real is what's real.

  MS

  Published by: mseberg on December 14, 2011 18:47

• Removal of RMAN, Data Guard, and Archives journal

  Our DG Environment running Oracle 11 g R2
  We have a 3 node DG Environment with
  A primary being
  B and C being Active Data Guard Standby
  Backups are taken out of B and go directly to tape.
  Standby Redo Logs and fast recovery area are used
  
  
  
  Holding the recommendation of "Using Recovery Manager with Oracle Data Guard in Oracle Database 10g"
  RMAN primary control ('A')
  CONFIGURE ARCHIVELOG DELETION POLICY TO APPLIED PENDING
  
  RMAN standby ("B") where the backup is performed
  CONFIGURE THE NONE ARCHIVELOG DELETION POLICY
  
  RMAN set the other Standby ("C")
  CONFIGURE ARCHIVELOG DELETION POLICY TO APPLIED PENDING
  
  How can we know what newspaper Archives are eligible to be removed from 'A' and 'C '?
  When remove it takes place?
  How can say us when archiving logs are deleted from the 'A' and 'C '?

  Dear user10260925,

  The documentation that you read is reliable but not enough.

  The Oracle can handle the archivelog directory and know that you are eligible for deletion. Stuff you posted here was derived from the books online and is supported and can be used when the Oracle knows and manages the archivelogs. This is simply called the flash recovery area. Please read the FRA at this very moment.

  Under the personal component normal circumstances in the industry use a few scripts to achieve on backup archivelog deletion.

  Here's a useful example to you;

  # Remove old archivelogs
  ######################################
  00,30 * * * * /home/oracle/scripts/delete_applied_redo_logs_OPTSTBY.sh
  ######################################
  
  vals3:/home/oracle#cat /home/oracle/scripts/delete_applied_redo_logs_OPTSTBY.sh
  export ORACLE_SID=optstby
  export ORACLE_HOME=/oracle/product/10.2.0/db_1
  cd /db/optima/archive/OPTPROD/archivelog
  
  /oracle/product/10.2.0/db_1/bin/sqlplus "/ as sysdba" @delete_applied_redo_logs.sql
  grep arc delete_applied_redo_logs.lst > delete_applied_redo_logs_1.sh
  chmod 755 delete_applied_redo_logs_1.sh
  sh delete_applied_redo_logs_1.sh
  rm delete_applied_redo_logs_1.sh
  rm delete_applied_redo_logs.lst
  

  vals3:/home/oracle#cd /db/optima/archive/OPTPROD/archivelog
  vals3:/db/optima/archive/OPTPROD/archivelog#cat delete_applied_redo_logs.sql
  set echo off
  set heading off
  spool /db/optima/archive/OPTPROD/archivelog/delete_applied_redo_logs.lst
  select 'rm -f ' || name from v$archived_log where applied = 'YES';
  spool off
  exit
  vals3:/db/optima/archive/OPTPROD/archivelog#
  

  Hope that helps.

  Ogan

• Using Oracle 11 g Data Guard disaster recovery

  Hi, can anyone answer if Oracle 11 g Data Guard by itself provides an option for making/switch between the main bases and emergency (back and forth) disaster and as a restoration solution, seamlessly? Here's the scenario:

  1. two databases (active and reserve)

  2 put it to sleep (make primary with read/write)

  3. restore to the original database

  Data Guard has two transitions of role... Failover and the digital switchover.

  Passage to the fact exactly what you describe. You can switch to standby and vice versa. However, this will not work unless the primary and the standby are available. If you will not be able to perform an operation of swichover when you have a failure in the main data center that makes the primary db not available.

  Failover will be the day before in a primary for the moments where the primary origin is not available. Unlike the digital switchover, failover is one-way. There is no 'restoration' of failover. If you do not failover, then once the old Center of main data is operational again and you can get the former primary database up, you must restore from the first news and make a watch for the first new. At this point, you can then make a pass to come back and run in the original data center.

  HTH,

  Brian

• Data Guard archive political deletion log

  Hi all

  I configured the data guard with 2 bases Eve in oracle 11g.

  I want to use rman to delete archives on all servers.

  I have configured no FRA, no recovery catalog.

  My question is:

  If I delete waiting til sequence # 1627 and on primary sequence til = # = 1620 or vice versa this would cause problems for Data Guard.

  I say delete until the different sequences # on primary and standby cause problems for synchronization?

  Thank you

  So if I understand delete archivelog to sysdate - or delete archivelog all completed before sysdate n is not the archivelog deletion policy you put on RMAN?

  She depends on it. The note was made at the base of the MOS document how ensure that RMAN is NOT delete archived logs that have not yet shipped to standby mode (Doc ID 394261.1)

  Delete archivelog to sysdate - depends on all of the deletion policy. If the deletion policy is set on "applied pending all", then it does not delete the archives, if they are not applied on the day before. If the deletion policy is set to none, then it does not check if the archive is applied on the eve and deletes them directly.

  Last Archive generated on primary:

  SYS@oraprim > select max(sequence#) from v$ archived_log;

  MAX(SEQUENCE#)

  --------------

  114

  Last check-in applied in mode ensures:

  SYS@orastb > select max(sequence#) from v$ archived_log in case of application = 'YES ';

  MAX(SEQUENCE#)

  --------------

  109

  Delete policy set to NONE on primary:

  RMAN > show archivelog deletion policy;

  using the control file of the target instead of recovery catalog database

  RMAN settings for database with db_unique_name ORAPRIM are:

  CONFIGURE THE NONE ARCHIVELOG DELETION POLICY;

  RMAN > delete archivelog until 'sysdate;

  allocated channel: ORA_DISK_1

  channel ORA_DISK_1: SID = 60 type of device = DISK

  List copies of newspapers archived to database with db_unique_name ORAPRIM

  =====================================================================

  Thrd Seq S key low time

  ------- ---- ------- - ---------

  110-1-214 A JANUARY 13, 16

  Name: +FRA/oraprim/archivelog/2016_01_13/thread_1_seq_110.318.901050727

  216-1-111 A JANUARY 13, 16

  Name: +FRA/oraprim/archivelog/2016_01_13/thread_1_seq_111.317.901050731

  217-1-112 A JANUARY 13, 16

  Name: +FRA/oraprim/archivelog/2016_01_13/thread_1_seq_112.316.901050731

  113. OF 1 219 A 13 JANUARY 16

  Name: +FRA/oraprim/archivelog/2016_01_13/thread_1_seq_113.315.901050733

  222 1 114 A JANUARY 13, 16

  Name: +FRA/oraprim/archivelog/2016_01_13/thread_1_seq_114.314.901050737

  You sure you want to delete the items above (enter YES or NO)? NO.

  It is the removal of primary archives that have not yet been applied on the eve.

  Delete policy 'APPLIES ON STANDBY ALL' value on the primary:

  RMAN > show archivelog deletion policy;

  RMAN settings for database with db_unique_name ORAPRIM are:

  CONFIGURE ARCHIVELOG DELETION POLICY TO APPLIED ON ALL STANDBY;

  RMAN > delete archivelog until 'sysdate;

  output channel: ORA_DISK_1

  allocated channel: ORA_DISK_1

  channel ORA_DISK_1: SID = 60 type of device = DISK

  RMAN-08120: WARNING: log archived not deleted, not yet applied watch

  Archive log file name=+FRA/oraprim/archivelog/2016_01_13/thread_1_seq_110.318.901050727 thread = 1 sequence = 110

  RMAN-08120: WARNING: log archived not deleted, not yet applied watch

  Archive log file name=+FRA/oraprim/archivelog/2016_01_13/thread_1_seq_111.317.901050731 thread = 1 sequence = 111

  RMAN-08120: WARNING: log archived not deleted, not yet applied watch

  Archive log file name=+FRA/oraprim/archivelog/2016_01_13/thread_1_seq_112.316.901050731 thread = 1 sequence = 112

  RMAN-08120: WARNING: log archived not deleted, not yet applied watch

  Archive log file name=+FRA/oraprim/archivelog/2016_01_13/thread_1_seq_113.315.901050733 thread = 1 sequence = 113

  RMAN-08120: WARNING: log archived not deleted, not yet applied watch

  Archive log file name=+FRA/oraprim/archivelog/2016_01_13/thread_1_seq_114.314.901050737 thread = 1 sequence = 114

  It checks if the archive has been applied on the day before. As the 110 to 114 sequence is not applied in the waiting, the archives are not deleted on the primary.

  Hope that gives you a clear picture of how it works.

  -Jonathan Rolland

• Data Guard environment, how time will need to use standby Database

  Dear experts,

  OS - Windows server 2012

  Oracle Version - 11.2.0.1.0

  The size of the database - 500 GB

  I have the plan to implement Data Guard. The database size is 500 GB.

  Please find below the question

  (1) when the database is harnessed for how long take use waiting for database so immediately or a few minutes?

  (2) when the server went down how long then to connect with the server backup immediately or a few minutes?

  I'm new to the data protection environment. Kindly help me

  Hello;

  I can perform a failover or a failover with Data Guard Broker in about 20 seconds. If I don't use a broker, it takes about 3 minutes.

  Quick start failover takes less time. Time will depend on the material, etc. of configuration options.

  Best regards

  mseberg