Dataguard question.

Using Dataguard to maintain 1 primary database and 2 logical standby. Was wanting to convert 1 standby database to a standalone database for remote testing purposes. What needs to be done to the logical standby to a stand alone database?

Hi,
The purpose of Data Guard is to have a continouse availability of Database.
You can have physical/Logical Database, But its upto you how you want to use
stand by DB.
Here you can find some very good books on Oracle
http://www.oracle.com/pls/db10g/portal.portal_demo3?selected=3
Regards,
Darshan

Similar Messages

5 Dataguard questions on implementation and maintainence

I have created Oracle10g Dataguard Physical standby. Everything seems to working properly. I switch a log@primary and i see it applied at standby. In OEM the Primary instance is shown as "Primary" and Dataguard Normal.
Questions
=======
1.I used cold backup to create physical standby where i copied just the datafiles. I DID NOT copy the online logfiles from primary DB . Is this ok?
Reason i am asking is, I am seeing this in alertlog (Please see in Bold below). Could this message in alert be ignored?
Fri Mar 14 16:11:55 2008
Redo Shipping Client Connected as PUBLIC
-- Connected User is Valid
RFS[5]: Assigned to RFS process 9652
RFS[5]: Identified database type as 'physical standby'
Fri Mar 14 16:11:57 2008
Media Recovery Waiting for thread 1 sequence 140 (in transit)
Fri Mar 14 16:12:09 2008
RFS[4]: Archived Log: '/b03/archive/PRI/arch1_140_649240729.arc'
Primary database is in MAXIMUM PERFORMANCE mode
RFS[4]: No standby redo logfiles created
Fri Mar 14 16:12:12 2008
Media Recovery Log /b03/archive/PRI/arch1_140_649240729.arc
Media Recovery Waiting for thread 1 sequence 141 (in transit)
Fri Mar 14 16:12:58 2008
2. Physical standby was created in default mode " MAX PERFORMANCE" but i followed the manual and i realize i created standby redo logs at primary DB.
Is it true we do not need standby redo logs for MAX PERFORMANCE mode?
3. What is the quickest way to create a physical standby taking into consideration the downtime of the primary database.
4. Can we setup Dataguard for a live running production database (assuming prod is all set with prepare steps as laid out in manual) without downtime.
5. I hear dataguard management involves lot of shell scripting for log shipping, failover, switchover etc. Looking at 10g manual all these appear to be handled automatically if configured. Is it true that all the Dataguard functionality is auto and does not need shell scripting?
These are the things came up to mind. Please list any others you can think of for a Dataguard implementation. Any help greatly appreciated.
Thanks and have a great time.
S~

My question is , I havent created either online logfiles or standby log files on the secondary database, then how is RFS process applying the logs to the standby database?
If you do not create standby log files on the secondary database, then RFS process will apply logs from primary DB's archieved redo logs, refer 5.1 Introduction to Redo Transport Services.(http://download.oracle.com/docs/cd/B19306_01/server.102/b14239/log_transport.htm)
Also i see entries in v$log@standby, since i haven't created log files@standby where is this info getting from?
It will be through the entry in Stndby DB parameter file "LOG_FILE_NAME_CONVERT=
'/arch1/chicago/','/arch1/boston/','/arch2/chicago/','/arch2/boston/'
Thanks

DataGuard question - overcoming network latency problem

Hi
Dataguard for 10.2.0.4
Assuming we have a latency problem with the network between the primary and secondary databases in a dataguard configuration.
That means that my bottleneck is currently the network that cannot accommodate the amount of redo that is generated per second by the primary, and archive logs are accumulating on the primary site
Is there a way to configure the redo transport on the primary to transfer the archive logs in parallel – in case there is an accumulation of archive logs waiting to be shipped
I am talking parallel transfer to the same site , not to different sites – just to overcome the network bottleneck
Thanks in advance
Orna

Hi Sybrand,
Quoting from the doc
'Oracle Database 10g Release 2 introduces the ability to have multiple ARCn processes sending redo for a single archived-redo log over the network, reducing the time required to ship a single archive log to a remote destination. In previous Oracle Database releases, only one ARCn process at a time could archive redo from a given log file. The maximum number of network connections that will be used in parallel to perform archival to a destination is controlled using the MAX_CONNECTIONS attribute of the LOG_ARCHIVE_DEST_n initialization parameter. The LOG_ARCHIVE_MAX_PROCESSES initialization parameter can be set as high as 30, (the previous maximum was 10)'
My 'back of a cigarette packet' calculation was not meant to be exact just meant to illustrate a point :-)
I still think your confusing bandwidth with latency but I don't want to poke an angry response :-)
Cheers,
Harry
Edited by: Harry on Jul 10, 2009 3:33 PM - seems the language filter doesn;t like my British slang. Changed to cigarette......

Dataguard question.---URGEN

Oracle 9i(9.2.0.6) on solaris 9
I have changed redologs location few times on primary in last 3 months.
Some times I added and dropped the redo logs too.
How does it impact physical standby.
I am going to activate physical standby datasbase.
When I query primary databases. I got 10 redo logs with 5 groups 2 mebers for eacgh group.
On Physcal standby I get 15 red logs 5 groups 3 mebmers for each.
What does this mean? When I I make changes to redologs to primary does not synchronise physical standby.
Thanks in advance for help.
Message was edited by:
user539835

Thanks.
I did read it before I posed this question. I know thats a manual process.
Just want to make sure that what I see on physcial standby is what I get once I activate the physical standby database.
I do not mind having 15(5 groups 3 meembers each) redlogs when I activate the physcial standby database. I quesry physcial sandby with
select * from v$logfile, I get 15 redologs as opposed to 10 on primary.
That means when I activate the physcial standby database the database will have 15 redo logs.
in last 3 months we had increased/decreased the redo logs and even moved them different disks on primary.
Thanks

DataGuard questions

How to decide physical or logical database is better for dataguard?
if we have to re-build standby db , what need to be stoped on primary while there is no standby? what are command to start/stop log shipping?
Can i use Database control to check, fix dataguards? dbcontorl of primary or secondary db?

Does the console, rather than Grid Control, allow
Dataguard control? I thought it had to be Grid
Control.FWIW, I can confirm it must be the Grid Control and does not appear through the DB Control. This based on both my experience and the references to 'Enterprise Manager' in the DG Broker manual which all depict the Grid Control (http://download.oracle.com/docs/cd/B19306_01/server.102/b14239/concepts.htm#sthref120)

Oracle Dataguard Question on Physical Standby Database with a Time Lag

I have a Standby database (PROD_LAG) that has a delay of 24hrs. How do I check to see what Archive have applied, what is current, and what is left to do.
There is a script but its for a Logical Standby database...
Thanks you in advance...

hi,
ok a little bit more explanation.
The GUI does work but seems to report incorrect data.
I have carried out a switchover so the primary database is now 'offsite_emrep' and the standby database is 'office_emrep'
The GUI how ever still reports that office_emrep is the primary database.
I cannot add the offsite_emrep database as the host is unknown. I am however running the GUI from the Host.
I have the following from the agent status
[oracle@griddg bin]$ ./emctl status agent
#Oracle Enterprise Manager 10g Release 3 Grid Control 10.2.0.3.0.
Copyright (c) 1996, 2007 Oracle Corporation. All rights reserved.
Agent Version : 10.2.0.3.0
OMS Version : 10.2.0.3.0
Protocol Version : 10.2.0.2.0
Agent Home : /u01/app/oracle/product/10.2.0/agent10g
Agent binaries : /u01/app/oracle/product/10.2.0/agent10g
Agent Process ID : 19797
Parent Process ID : 19780
Agent URL : https://griddg.domain.net:3872/emd/main/
Repository URL : https://griddg.domain.net:1159/em/upload
Started at : 2007-10-01 12:35:02
Started by user : oracle
Last Reload : 2007-10-01 12:35:02
Last successful upload : (none)
Last attempted upload : (none)
Total Megabytes of XML files uploaded so far : 0.00
Number of XML files pending upload : 116
Size of XML files pending upload(MB) : 27.67
Available disk space on upload filesystem : 83.08%
Last attempted heartbeat to OMS : 2007-10-01 12:38:08
Last successful heartbeat to OMS : unknown
Agent is Running and Ready
any help is appreciated.
rgds
alan

Oracle dataguard question

Hi,
oracle version : oracle 9i
I have primary database and one logical standby and one physical standby database, if something goes wrong to primary for which one is it logical or physical i need to failover. and which one feasible.
Thanks
Prakash GR
Edited by: prakashdba on Aug 19, 2009 7:12 PM
Edited by: prakashdba on Aug 19, 2009 7:13 PM

To add to Justin's point :
1. You must confirm if the Logical Standby is for every schema and every object that you have in the Primary. If it doesn't apply every SQL from the Primary, it isn't a full replica.
I would think that a Logical Standby would be built for a subset of the objects (tables) in the Primary -- e.g. for the reporting purposes that Justin mentions.
2. You must also consider how "lag" between the Primary and the two Standbys is configured. Whether archivelogs from the Primary are applied immediately -- to both standbys or to one earlier than the other (because lag is configured). Obviously, you would consider using the one with the more recent data !
3. When you do failover, you (management / users) must be aware of what the lag, if any, is between the standby and the primary -- what data may not have arrived at the standby.

Problems for ora9i administrator

hey
could you see this administration problems, and tell me how to solve it
the problem is :
At the end of the day one Monday, DB administrator tried to run an application working against Oracle 9i database, he got following error message:
ORA-01115: IO error reading block from file 13 (block #66771)
ORA-01110: Data file 13:'/ndxs/oradata/Prod/df001.dbf'
Where df001.dbf is one of the Index tablespace files.
Q1: what do these messages indicate and what are the possible causes of this problem.
Q2: what actions you will do trying to solve this problem, given that the database is running in archive mode.
Q3: To enable fast failover when a production outage occurs, oracle has a feature called DATA GUARD.
3-1 Describe briefly how can you use this feature and what are its benefits.
3-2 Make a list of the steps you should do to run this feature on your database.

Why does this have the smell of a homework problem?
The DataGuard questions can be answered in the docs found at tahiti.oracle.com

Questions on dataguard

I have quick couple of questions on dataguard.
1) how much time time it will take to generate (move ) the logfiles from production to standby database ?
2) Can we speed up the transfer the logfile from PROD to Standby?
3) If 2nd Questions is YES. How can i speed up the process?
In IBM DB2 its just 30 Sec max to replicate the data from PROD to STANDBY. Becasue we dont want to loose the data for a while.
Thanks
Krish
Message was edited by:
Venkat.K.Raju

What is your database version?
Assuming that it is 10g R2, the following white paper has all the answers you need:
Data Guard Redo Transport & Network Best Practices Oracle Database 10g Release 2
(http://www.oracle.com/technology/deploy/availability/pdf/MAA_WP_10gR2_DataGuardNetworkBestPractices.pdf)

Dataguard Interview questions and most frequeently asked DG issues

Hi Gurus,
I am new to this forum and happy to be a part of it.
Can someone help me in posting " Dataguard Interview questions and most frequeently asked DG issues" as i am preparing for the interviews.
And also share the enhancements to DG in 11g.
Thanks in advance.

I'm not impressed by any of the questions at any of the linked sites provided so here are the one's I would expect someone to be able to answer:
1. What is the difference between Physical and Logical Data Guard in terms of how they work and how they are used in the enterprise?
2. What is the difference between vanilla Data Guard and Active and Snapshot?
3. How do you enable the Data Guard Broker process and why and when would you want to?
4. Who is Larry Carpenter and why should you care?
5. What parameters in using orapwd are critical for success?
6. What would you recommend as a value for SEND_BUF_SIZE and why?
7. Given a primary production database, and a full RMAN backup that takes 1 hour to fully restore ... how long would it take you to implement Physical Data Guard from the time you started working?
If the answer to question 7 is greater than 2 hours ... my assumption would be that you probably had never done it before and it wouldn't matter that you got the first six questions correct.

DataGuard and ASM Question

I want to implement Dataguard between non-asm instances. My question is how to move data from non-asm to asm box.
Thanks,

Sure. The location of the data files is irrelevent to DataGuard-- DataGuard is only concerned with the change vectors (i.e. the redo information).
Justin

Dataguard quick question

Hi:
I have dataguard implemented for version Oracle 10gR3. During migration, we had to import from old server to new server. While import, we had to turn off Archive Log for about 2hrs to speed up the import process. Once the import was done, we enabled the Archive log. During this switch, DG Physical standby failed. When i try to reinitialize, the standby is not applying any more logs from teh time the Archivelog was disabled.
My question is - Shoul i recreate the DG standby by dropping the current one which is lagging more than 50 logs or can i repair the standby to start applying the logs and move forward?
Please advise.
Thanks
Here are few commands i used to sync Standby with Primary:
--On standby in MOUNT state: "alter database recover managed standby database disconnect from session;"
--Verify new archived redo log file applied- few from the list
1 SELECT SEQUENCE#,APPLIED FROM V$ARCHIVED_LOG
2* ORDER BY SEQUENCE#
SEQUENCE# APPLIED
2397 YES
2398 YES
2399 YES
2400 YES
2442 NO
2443 NO
2444 NO
2445 NO
2446 NO

Yes. When you say 're-initiate'--recreate from scratch by dropping the current one? When i drop the current one and start the recreation - should this have any impact on the primary? I believe it will not bounce or take anything offline on the primary right? Just want to confirm....thanks.

Oracle 10gR2 Dataguard quick question

Hi -
Just a quick question about Oracle 10gR2 Dataguard. I'm in the process of creating dataguard standby, which is running for few hours and could take few more hours because of the size and the standby's network latency, and i'm using OMS to create the DG. I'm in a situation now to create new tablespace(A) and also one more datafile to the existing tablespace(B).
Question is: How would this new tablespace and the new datafile in the existing tablespace affect the DG standby which is about to finish in couple hours? Will the DG pickup the new changes from the primary? Or, will it be done with error from the mismatch of the number of files? The issue is that i can't wait for the standby creation to be done as the additional tablespace and datafile requirement is production critical, and should be added right away.
note: standby_file_management is set to auto.
Thanks for your response.
regards.

Your post is a bit vague, as OMS is an acronym for Oracle Management Server, which is a service only.
If you would have stated you are using Database Control, or RMAN duplicate database, the picture would have been much clearer.
Database Control uses rman duplicate database.
Recovery is the mandatory implicit last step of this procedure to pick up all changes since you started the duplicate.
One word of warning: Network latency is one thing to avoid like hell in a standby configuration.
It might even slow down your production database.
Sybrand Bakker
Senior Oracle DBA

DataGuard postings relocated -- not a technical question

Hello,
I have seen from last night DataGuard posts is moved from Database - datagaurd to Database - high availability.
By this changes, there would be some confusion for OP's.
Normally any OP first go to Database & then he search for "DataGuard", when he cant found then he/she try to post in "Database - General", So by this process its going to be less flow/usage further in data guard
How to Avoid miscommunication to OP?
Why these sudden changes?
Is this change really helps?
Thanks.
CKPT.

oracletechnet wrote:
We have consolidated some of the Database-related forums into subfolders; the list was becoming much too long.
The forums URLs themselves have not changed so there really should be minimal disruption.Yes of course in database there is a big list. Correct.
But from last week there is less flow comparatively after changes been made to sub folders. Looks OP is posting into database - general, I saw some of the threads too, which are not routed to dataguard.
I have one idea, if it's wrong let me know.
I I have a question in ASM, Im not new so I know where is this folder, so I can go and post there. No issues.
Some one who new to OTN, may be he or may mo be known where that folder exist.
So, for all the questions, there would be only one template to post, but add extra popup scroll button, which consists of all the divisions. It's like example of (answered,unanswered,all) threads selection menu. So that while posting by any OP he/she has to choose one division where he/she likes to post.
If I give subject line, description, at the same time I select where I want to post by the popup option. So that it question will be routed to the relevant division. Again there would be no work for moderators to move threads from one division to another division.
Hope it clears.

Dataguard general question

If you are using 11gR1 DataGuard ...
If you truncate a table and import data back into the table on the PRIMARY will these actions carry forward to the STANDBY?
Edited by: G. Chaika on Aug 13, 2010 11:49 AM

Dear G. Chaika,
The answer to your question should be "yes" and i think you may simply try it on your database.
On the other hand since you are using the 11gR1 you can open the standby database with the read-only option and start the MRP process durin the physical stanby database is open. That means the data guard will continue to replicate the database while doing that, the physical sandby will open (read-only).
This makes you easily trace the standby database actions when something changes on the primary database.
Hope That Helps.
Ogan

Dataguard question.

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