Data Guard vs. Streams

What is the difference between Data Guard and Streams?
Which one should I choose in order that two database systems in different servers are synchronized with each other? There are two situations:
1. One database system is in Tru64 UNIX operating system, the other in Windows 2000 Server OS.
2. Both database systems are in Tru64 UNIX OS.
Thanks,

Sorry, I missed that wrinkle.
You'll need to have machines with the same O/S to have Data Guard work. If your requirements are to have the databases completely synced, you'll need to use Data Guard, so you'll need a new machine.
You can roll your own process using streams without buying a new machine, but it won't be as robust as the Oracle solution and won't handle all the possible failover scenarios, etc. A lot depends on the strictness of your requirements.
Justin
Justin

Similar Messages

Streams Plus Data Guard

Hi,
Looking at http://otn.oracle.com/deploy/availability/htdocs/DataGuardStreams.html I see that Data Guard and Streams can be deployed on the same primary database.
Has anyone done this and if so are there any pitfalls.
Also, how much of the Streams environment is propagated by Data Guard, and how much needs to be re-instatiated once the standby is brought into the primary role after switchover/failover. This is for Oracle 9.
Any help/hints/pointers much appreciated.

Graham,
Streams can co-exist with Dataguard in Physical mode, but Data Guard SQL apply mode and Streams are not supported on the same database.
I have not implemented such a setup. You can review the " Streams High Availability Environments" chapter in the Oracle9i Streams Release 2 (9.2) [Part Number A96571-02] documentation for details on what to do when a failover occurs. This chapter also provides advice on when to use Streams and when to use DataGuard.
Note: The Streams manual was updated with the 9.2.0.2 release, so check the part number of the book you reference. If it doesn't match the one listed previously, view the more current documentation on TechNet.

Active Data Guard VS Golden Gate

Hi Experts,
I am looking for High Availability and Disaster Recovery architecture for my data layer i.e. Oracle Database 11g R2
We have two physical locations and the distance between two sites is around 20 miles.
Site 1:
We already implemented RAC setup with two node in site 1.
Site 2:
We are going to implement standalone database. (Not RAC)
My requirements:
1. Both databases at Site 1 & Site 2 should be replica of each other.
2. Both databases should be in sync always.
3. Site 1 is active and Site 2 is stand by.
4. Client applications on Site 1 & Site 2 should always talk to RAC database on Site1.
5.. If RAC at site 1 goes down completely, then ONLY client apps should connect to Site2 database without human intervention.
How can acheive my requirement ? I was doing some research & found two solutions. 1. Active Data Guard 2. Golden Gate.
Questions:
1. Do Data Guard and Golden Gate offers same features ?
2. Which products offers solutions to all my requirements or Do I need to use both ?
3. If Data Guard and Golden Gate are different from each other then What is the difference between them and what are the overlapping features among them ?
Thanks

Hi;
Both tool are HA tool. Please see below link
Thanks for the question regarding "Data guard vs Streams vs GoldenGate", version 11.2.0.2
http://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:3349335100346299316
Golden Gate versus Data Guard for replication
Golden Gate versus Data Guard for replication
If you have still question please update thread
Regard
Helios

DATA Guard Logical Standby v.s. Streams Apply (10gR2, rac -- rac )

Greetings -
We currently have a 3 node cluster, doing a 'Schema' capture, with a 2 node cluster serving as the apply side. Both are on 10gR2 (solaris 10)
We have been experiencing apply latency due to large transactions. The way logminer/streams evaluates the arch logs, it converts each updated row into a transaction as part of a transaction set, using 'decode (' statements.
I am under the impression a physical standby will do the same thing. But what about a logical Standby ?
(this from the Oracle Documentation)
[10g Concepts|http://download.oracle.com/docs/cd/B19306_01/server.102/b14239/concepts.htm#SBYDB00010]
...Contains the same logical information as the production database, although the physical organization and structure of the data can be different. The logical standby database is kept synchronized with the primary database though SQL Apply, which transforms the data in the redo received from the primary database into SQL statements and then executing the SQL statements on the standby database.
Does anyone know firsthand if SQL APPLY re-issues the original sql, or if it relies on the 'decode' command as well ?
Thanks
The Nets Edge

A Physical standby does not do anything with SQL. It is running media recovery under the covers. A Logical standby uses the Logminer to read the redo, converts it to SQL and Data and applies those transactions to the Logical standby.
The both build logical change records, figure out order, dependencies etc etc and applies the transaction. Both are susceptible to long running transactions on the Primary (source) database.
Streams uses Logminer, Logical Standby use part of the Streams apply so as Mr. Morgan said, they are very similar :^)
If you are having apply performance issues you may want to look at Active data Guard.
Larry

Data Guard logical standby Versus Streams

I'm referring to both Oracle 10g/9i
If a Data Guard logical database uses similar technology to Streams (Log Mining and SQL apply), why can't you stand up a standby database on a different platform, or at least I have found nothing on the subject.
But in 11g Oracle Data Guard (physical standby database) is a solution for same endianness platform migration.
I will appreciate any insight on the subject.

Yes...thats true...both uses same technology...
REDO LOGMINER
SQL------------------------>BLOCK LEVEL CHANGES---------------------------------->SQL
But there are serious implemetation diff..
1) Oracle Data Guard is designed for protecting from data failure and disasters.
Streams is designed for information sharing and distribution but can also provide a very efficient high availability solution.
2) Streams is configured from the bottom up — individual tables, schemas, capture processes, apply processes, queues.
Logical Standby is configured from the top down — start with entire database, then specify only what you don’t want.
As logical standby is top down and changes are capture at remote location (logical standby db) and for that archive log need to be shipped using FAL client/server to remote and to ship the archivelog in Data Guard configuration, all members should be running on same platform.
As said before, Streams is configured from the bottom up, it start with tables--> Schemas--->Database and we can capture changes at local/remote location. If we capture changes locally, target streams db can be on diff platform. But for downstream capture must need same platform as logical standby database needed so that archivelogs can transport from source to downstream db.

Oracle Streams VS Oracle Data Guard

Hello,
Could you please explain me what are the different between Oracle Streams VS Oracle Data Guard?
They are completely different or similar purposes?
Thanks.

812322 wrote:
Hello,
Could you please explain me what are the different between Oracle Streams VS Oracle Data Guard?
They are completely different or similar purposes?
Thanks.http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:14672061404704

Data guard vs. oracle stream

Our db is 10g 2 nodes RAC db and the db server is window 2003 server. Our standby db was using data guard for feeding data from primary to standby. Since our standby db was not up to date now we are planning to rebuild our standby db. We are debating if we should use data guard or oracle stream to feed data to this new standby db. Can any body give us some insights on which one is better on this purpose?
Thanks a lot in advance!!
Shirley

One has
1 physical standby
2 logical standby
3 streams
Only 1 is a zero-loss, high-availability solution.
2 and 3 do not support all data types, and will automatically suppress not-supported datatypes.
3 apart from that is also asynchronous, where 1 and 2 can be set up to be synchronous.
3 will be also much more difficult to troubleshoot. Basically: when you are out-of-sync you have to rebuild. You can't re-ship redolog files.
1+2 ship redolog files to the standby server, 1 uses them to recover the database, 2 uses them to mine them and to re-execute the transaction.
3 mines redolog files at the source, and sends statements to re-execute them.
Only 1 is a true HA solution.
You can not use Streams to build a standby database.
The purpose of Streams is replication, not standby.
Sybrand Bakker
Senior Oracle DBA
It is just what you want

Can streams and data guard run together

I need to set up a staging database to run streams from.
Can I use data guard from the production database to the staging database and
streams on top of that?
Has anyone done this?

Correction:
Data Guard Redo Apply can be used to provide high availability/disaster recovery for a Streams database. For best practices using Dataguard Redo Apply with Streams, see http://www.oracle.com/technology/deploy/availability/pdf/MAA_WP_10gDataGuardRoleTransitionsStreams.pdf
Data Guard SQL Apply cannot be used to provide high availability/disaster recovery for a Streams database.

Will Oracle Data Guard be replaced by Oracle Stream soon?

Will Oracle Data Guard be replaced by Oracle Stream soon?
In my opinion Oracle Stream can replace Oracle Data Guard completely.
Message was edited by:
frank.qian

While some of the technologies that underpin Streams are being increasingly incorporated into DataGuard, it's quite unlikely that DataGuard will go away.
Streams is the successor to Advanced Replication, which is designed to allow a source database to propagate data to a distinct database in a different environment without necessarily having to have the two databases tightly coupled. You can have different databases in different regions managed by different DBA groups who don't necessarily care whether any of the other systems are up using Streams (or Advanced Replication before it). Failing over between these systems, while possible, requires a fair amount of custom scripting, but is certainly possible.
DataGuard, on the other hand, is designed to allow you to have multiple copies of the same database that are tightly coupled for high availability. Similar in concept, but there are very different trade-offs in the design.
That said, Streams and Logical Standby both use very similar technologies to mine the redo information for change records. As DataGuard uses Logical Standby more and more, potentially as a replacement for physical standby, they'll use more and more of the same underlying technologies. They'll still be very different products.
Justin

Supplemental logging with Oracle 10gR2 Streams and Data Guard

Hello,
I have a environment with Oracle DB 10gR2 and Physical Standby with Data Guard DR Conf. Right now, this environment is going to be extended to a replication schema using 2-way Oracle Streams Replication (for replication to the central office from this branch office, other branchs will be added soon). The primary DB will be replicated to the other primary DB (in the remote central office).
So, there is my question: It's completly necesary to specify Supplemental Logging on the sources databases (primaries) for setting 2-way Streams Replication?, and, if it's completly necesary, then, do I can set Supplemental Logging on primaries without affect theirs physical standbys, or do I need to do something special?
Thanks in advance.

Sorry, it's repeated. 'cus browser connection problem.

Data Guard with Oracle 9i and 10g -- have you done it?

We have an ERP system (JDEdwards, db size approx 600 GB) and we'd like to copy the data in this system to a database on another computer. We'd use the remote database for reporting, so we need it to be available. We are looking at using Data Guard running in Logical Standby mode.
The ERP database is Oracle 9i, and we are considering having the Logical Standby database be 10g. Have you done this and if so, what was your experience?
Here's why we want to do this. There are many tables in the ERP database that contain descending indexes. We can't change this, and it is not supported with Data Guard under Oracle 9.2. Tables with descending indexes do not copy to the logical standby database.
We were told that this is corrected in a newer release of Oracle, and we were wondering if a 10g database would properly copy tables with descending indexes.
Thanks in advance for any experiences you can share.
Best Regards,
Mike

What you are trying to do might not be possible. Because when you create logical standby you have to create a physical standby first and convert it. Primary and standby have to be same version.
In furture it might be possible because 10G will support rolling upgrade of logical standby.
However even it's possible you have to go through a lot of pain to setup and maintain it because Oracle don't support the setup.
What you could try are Stream and Replication, I will say Stream is very interesting one. Because Oracle say : "Oracle Streams and Oracle Data Guard (including Data Guard SQL Apply) are independent features based on some common underlying infrastructure and technology. "
http://www.oracle.com/technology/deploy/availability/htdocs/DataGuardStreams.html

Data guard performance problem (rac to single instance)

i have a table it has GPS data, and gps table has too many data, 5 millions,
iam using RAC (2 nodes 11gr2). standby database is single instance data guard,
single instance database (standby)'s hardware cpu is lower than RAC machines. rac nodes have (15k) disks, standby has (7200rpm),
so i dont want to use GPS tables on data guard system, i dont want to run GPS table's DML commands (delete, insert), i think it may increase performance,
is it posible? what is your advise?
any feedback makes me happy,
best regards

it's not possible with data guard, but you can use streams or golgengate for this purpose. Have a look at dataguard performance tuning guide. Maybe there is something you can fix on the configuration to be faster.
[Data Guard Redo Apply and Media Recovery Best Practices|http://www.oracle.com/technetwork/database/features/availability/maa-wp-10grecoverybestpractices-129577.pdf]
[Redo Transport and Network Best Practices|http://www.oracle.com/technetwork/database/features/availability/maa-wp-11gr1-activedataguard-1-128199.pdf]
I don't know an 11g version for these docs but they would still help.

Database is configured for Data Guard

I am run a UTF8 conversion on a development database that has been cloned from Data Guard. There is a warning in Migration Status: "Database is configured for Data Guard" What is the DMU looking at to determine this? The database is open in read-write mode and it behaving like a primary database (I run the DMU scan and run updates to fix invalid representations). I would like to know what settings I need to update.
Is this preventing me from converting tables using CTAS? When I try to select this for all tables I get the message, "The DMU does not support the conversion method "Copy data using CREATE TABLE AS SELECT" for tables that are involved in an Oracle Streams process, like capture or apply. Use another available conversion method for the table"
Thanks,
Ben

The DMU checks if the parameter DG_BROKER_START is set to true.
The problem with CTAS is independent from Data Guard. The DMU checks for tables that:
- are source of asynchronous Streams capture, or
- have update conflict handlers, or
- have DML handlers, or
- have conflict resolution parameters
The above tables are considered configured for Oracle Streams and are not supported by CTAS conversion method. This is because the CTAS method creates a converted copy of the table and drops the original. The DMU is not capable of moving the Streams configuration information from the old table to the new one.
Thanks,
Sergiusz

Switchover in a data guard environment using Grid Control 10.2.0.3

I've tested switchover in a data guard environment using Data Guard Broker in Grid Control.
However, at times, i receive the message "RemoteOperationException: failed to establish input streaming thread". It looks like it has problems connecting to the remote node using the host credentials supplied. I know the credentials are ok because this worked before. If i test preferred credentials, it's ok too..
The workaround has been to restart the database and this seems to work.
Has anyone experienced this?

Thanks for All for replying.
*1. How can I upgrade my Grid control 10.2.0.3 to 10.2.0.4?*
I have upgraded the Grid Control Agent and OMS from 10.2.0.3 to 10.2.0.4
When we upgrade the OMS which also upgrade the Repository database.
Apply the patchset p3731593_10204_Linux-x86-64.zip (Which comes with Grid_Control_10.2.0.4.0_Linux-x86-64.zip)
su - oracle
cd 3731593/Disk1
./runInstaller (Run two times for Agent and oms upgrade)
Agent upgrade_
During upgrade
Specify Home Details: Select the Agent Home to upgrade Grid Control Agent.
Ex: /u01/app/oracle/OracleHomes/agent10g
OMS upgrade+
Specify Home Details: Select the oms home to upgrade oms
Ex: /u01/app/oracle/OracleHomes/oms10g
*2. How can I monitor/Connect my Existing database 10.2.0.4 from Grid Control 10.2.0.3?*
Install Grid Agent on the existing database server 10.2.0.4
Download Linux_x86_64_Grid_Control_agent_download_10_2_0_4_0.zip from OTN http://www.oracle.com/technology/software/products/oem/htdocs/agentsoft.html
su - oracle
cd /u01/software/GridAgent/linux_x64/agent
./runInstaller
Refer:
[To Install an Additional Management Agent Using OUI|http://download.oracle.com/docs/cd/B16240_01/doc/install.102/e10953/installing_em.htm#sthref318]
OracleÂ® Enterprise Manager Grid Control Installation and Basic Configuration
10g Release 4 (10.2.0.4)
Part Number E10953-05
3 Installing Enterprise Manager
Thanks
Mukarram Khan
Edited by: Mukarram Khan on Feb 6, 2009 11:04 PM

Oracle 10gR2 Data guard physical or logical standby server?

Hi
We are planing to implement an Oracle 10gR2 data guard standby server for DR purposes, I found out that there are two type of standby server which is logical and physical standby server. I want to know which one is preferable? in term of complexity of setup and maintenance?
regards

Well it depends on what you mean by maintenance. I found the physical standby to be very little trouble at all ; however the logical standby has restrictions on it that the physical standby does not. In essence the physical standby merely digest archive logs; where as the logical standby uses logminer like functionality to process sql statements much like Oracle streams.
Hope that helps,
-JR jr.

Data Guard vs. Streams

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