Difference between physical and logical standby database

What is the difference between physical and logical standby database?

Hi,
Physical Standy where its a read only DB.
Logs are applied.
Logical Standy where it can be Read / Write DB and the logs are applied in terms of SQL Statements.
Thanks & Regards,
Pavan Kumar N

Similar Messages

Time difference between physical and logical standby

Hi,
I have just been tasked on getting some info and setting up dataguard for some users for read-only/reporting purpose.
The 3 questions I am being asked are:
1. What is the time difference in applying changes from primary to physical standby compare to logical standby
2. What is the overhead maintenance of having a standby database?
3.What latency is involved?
I will be glad to have your input on this.
Thanks

Hi,
Physical Standy where its a read only DB.
Logs are applied.
Logical Standy where it can be Read / Write DB and the logs are applied in terms of SQL Statements.
Thanks & Regards,
Pavan Kumar N

CPU patch procedure with physical and logical standby database in place

Hello All,
I've also placed this in the Upgrades forum, but perhaps this is the best place to have put it.
I'm trying to compile a decent set of steps for applying the CPUOCT2008 patch to our production RAC cluster which has both a logical and physical standby in place. I've read a tonne of documentation, including the CPU readme, DOCID 437276.1 and 278641.1. I''ve also read through the Upgrading Databases in a Data Guard Configuration chapter of Dataguard Concepts and Administration. The last doc mentioned is really for upgrading a full version of Oracle rather than applying a CPU (at least I think that's the case). DocID 437276.1 is rather sparse on details.
I guess what I'm trying to understand is the proper method for applying the patch with the logical standby in place. The physical standby looks pretty straightforward. After running opatch on it as well, it will basically have all of the changes applied to the primary shipped over and applied as per the normal primary/standby relationship. Will the same be true for the logical (having applied the patch, and then re-enabling SQL apply)? Should I aim to have it work that way? By that I mean start it up and re-enable sql apply and then upgrade the primary. Or, am I to apply the catcpu.sql script to it as well before re-enabling the sql apply? Am I wrong in regards to the physical standby as well i.e. should the catcpu also be applied directly to it?
Thanks very much in advance.
Cheers,
Chris
Edited by: chris.baron on Dec 12, 2008 11:38 AM

Given the fact that your system is far from main-stream I'd recommend opening an SR with Oracle Support Services (metalink) and asking them.
If you would like to publish a White Paper on your experience after you have successfully completed the project let me know off-line.

What are the differences between Oracle and other NoSQL database

Hi all,
I would like to know what the differences between Oracle and other NoSQL database are.
When and why should we use Oracle?
Is Oracle NoSQL database link with Big Data Appliance?
Can we use map-reduce on a single personal computer? How should we install Oracle NoSQL database to use map reduce on a single personal computer?
Do we also have eventual consistency with Oracle NoSQL database? Can we lose data if master node fails?
Are transactions ACID with Oracle NoSQL database? How can we prove it?
Thanks.

893771 wrote:
Hi all,
I would like to know what the differences between Oracle and other NoSQL database are.
When and why should we use Oracle?I suggest that you start here:
http://www.oracle.com/technetwork/database/nosqldb/overview/index.html
Is Oracle NoSQL database link with Big Data Appliance?Yes, Oracle NoSQL Database will be a component of the Big Data Appliance.
Can we use map-reduce on a single personal computer? How should we install Oracle NoSQL database to use map reduce on a single personal computer?Yes, I believe you can run M/R on a single computer. Consult the various pieces of documentation available on the web. You may run Oracle NoSQL Database on the same computer that you are running M/R on, but it is likely that they will compete for CPU and IO resources and therefore performance may suffer.
Do we also have eventual consistency with Oracle NoSQL database? Yes.
Can we lose data if master node fails?If you run Oracle NoSQL Database with the default (recommended) durability settings, then if the master fails, a new one will be elected and data is not lost.
Are transactions ACID with Oracle NoSQL database? How can we prove it?Yes, each operation is executed in an ACID transaction. The API has the concept of "multi" operations which allow the caller to perform multiple operations on sets of records with the same major key, but different minor keys. Those operations are also performed within a transaction.
Charles Lamb

What is the difference between != and Logical NOT operator

kindly,tell me what is the difference between Not Equality operator and logical negation operator.
Edited by: user13414134 on Dec 3, 2010 8:59 AM

what is the difference between != and Logical NOT operator The NOT operator is transformed into the inequality operator (<>), as can be seen from the Predicate Information of the explain plan:
SQL> explain plan for select * from dual where :x != :y
Explain complete.
SQL> select * from table(dbms_xplan.display())
PLAN_TABLE_OUTPUT
Plan hash value: 3752461848
| Id | Operation          | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT   |      |     1 |     2 |     2   (0)| 00:00:01 |
|* 1 | FILTER            |      |       |       |            |          |
|   2 |   TABLE ACCESS FULL| DUAL |     1 |     2 |     2   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   1 - filter(:Y<>:X)
14 rows selected.
SQL> explain plan for select * from dual where not :x = :y
Explain complete.
SQL> select * from table(dbms_xplan.display())
PLAN_TABLE_OUTPUT
Plan hash value: 3752461848
| Id | Operation          | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT   |      |     1 |     2 |     2   (0)| 00:00:01 |
|* 1 | FILTER            |      |       |       |            |          |
|   2 |   TABLE ACCESS FULL| DUAL |     1 |     2 |     2   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   1 - filter(:Y<>:X)
14 rows selected.

Physical vs Logical standby database

In the Oracle HA guide, it is mentioned that we must take Logical backup "in addition" to Physical backup (not instead of Physical Backup)
If I run have two systems i.e a Primary System and a Logical standby database system , is it not sufficient protection ? If the primary fails, can I not recover the primary system using the nightly backup I take from the Logical Standby Database.
If it is not sufficient protection, what exactly I will lose ?
Assume I take the nightly complete hot backup backup from the Logical Standby Database instead of the Primary System to save CPU cycles of the primary system.
In other words, it is said that "physical standby database provides zero data loss without any allowance for data divergence" -- What exactly is meant here ?

Thanks Werner for the reply.
1. If there is a human error (dropping a table by mistake), it will be applied to the standby database irrespective of whether it is physical standby or Logical standby. I am unable to see any advantage with Logical standby database in this case. Am I missing something here ?
Or are there any other type of user errors where Logical standby provides an advantage ? Can you please name some ?
2. If I backup from the logical database and if I am willing to "restore" (instead of recover) the primary from this backup in case of a primary failure, is it not the same effort ?
3. Can't we set up a Logical Standby with Maximum Protection Mode ?
I am aware physical standby offers a better performance and it has no data type restrictions. I do not care about these two. Also, I am aware of the extra features provided by Logical database.
Overall, I am trying to see whether physical standby database has any "feature" which I will miss with Logical standby database. I tried my best with Oracle documentation, but I could not get a clear answer.
Any help is appreciated.

Apply CPUOCT2008 with both a physical and logical standby in place

Hello All,
I'm trying to compile a decent set of steps for applying the CPUOCT2008 patch to our production RAC cluster which has both a logical and physical standby in place. I've read a tonne of documentation, including the CPU readme, DOCID 437276.1 and 278641.1. I''ve also read through the Upgrading Databases in a Data Guard Configuration chapter of Dataguard Concepts and Administration. The last doc mentioned is really for upgrading a full version of Oracle rather than applying a CPU (at least I think that's the case). DocID 437276.1 is rather sparse on details.
I guess what I'm trying to understand is the proper method for applying the patch with the logical standby in place. The physical standby looks pretty straightforward. After running opatch on it as well, it will basically have all of the changes applied to the primary shipped over and applied as per the normal primary/standby relationship. Will the same be true for the logical (having applied the patch, and then re-enabling SQL apply)? Should I aim to have it work that way? By that I mean start it up and re-enable sql apply and then upgrade the primary. Or, am I to apply the catcpu.sql script to it as well before re-enabling the sql apply? Am I wrong in regards to the physical standby as well i.e. should the catcpu also be applied directly to it?
Thanks very much in advance.
Cheers,
Chris

Given the fact that your system is far from main-stream I'd recommend opening an SR with Oracle Support Services (metalink) and asking them.
If you would like to publish a White Paper on your experience after you have successfully completed the project let me know off-line.

Physical and Logical Standby

Hi
I just wanted to know can i have one Physical and One Logical Standby for a Single Primary Database. Is there any precautions and steps to be followed .
Thanks

user9366471 wrote:
Hi
I just wanted to know can i have one Physical and One Logical Standby for a Single Primary DatabaseYes this is possible.
See following Oracle 10.2 example which talks also about cascaded standbys:
http://download.oracle.com/docs/cd/B19306_01/server.102/b14239/cascade_appx.htm#i637055

Difference Between Physical and System Stock.

Hi Gurus,
I am facing a problem in Executing One Scenario.
Actually we have one Raw Material which contains a "Moisture Contain" Half it own weight.
When we are procuring it, we do it as it is i.e. including the weight of Moisture.
But when we are issuing it for production the scenario is like,
Suppose we require 10 Kg of that Raw Material for 5 Kg of finished product.
Physically we are Isuuing 10 Kg, But in system we are Issuing it as 5 Kg only (i.e "Excluding the Moisture Content of 5 Kg").
But beacuse of this there is a variation in Physical and System Stock.
How to aviod this Variation in Stock?
Please Help.........
Thanks in Advance.

HI
Maintain the moisture content in Component scrap in MRP4 and do all the calculation on dry basis only for FG.
also while procuring the item system will calculate PR qty including the moisture content.
Check with your MM consultant.
Regards
Anupam Sharma

Oracle - ROWID (Physical and logical)

Hi,
Could you please clarify the below doubts?
- Difference between Physical and Logical ROWID's
- Difference between ROWID and UROWID datatypes
Regards,
Ragav

Instead of an answer, may I suggest you go through following link?
http://download.oracle.com/docs/cd/B19306_01/server.102/b14220/datatype.htm#sthref3894

Streams Replication:Source database Physical or Logical Standby DB

Can the source database in streams replication be a physical or logical standby database ? If so, is the process of configuring streams the same as a regular database ? Are there any best practices or different configuration if the source is Logical or Physical standby DB ?
Thanks in advance.

Never done it, but I don't see any reason why it should not work.
Streams, at capture site, is only a data dictionary game and in a logical standby your data dictionary is open read write.
Streams, at capture site, never touch the source tables, in fact they may even not exists from Streams point of view,
as it deals only with the redo that are generated.
So Streams horizon is limited to the data dictionary, the log buffer, the archives and, in SYSAUX tablespace, all the LOGMNR_% tables. All these structures are read write in the logical standby. However, for the capture/propagation you may have to set to true the 'include_tagged_lcr' parameters.

Creating a new schema in a Logical Standby Database

Hi All,
I am experimenting with logical standby databases for the purpose of reporting, and have not been able to create a new schema in the logical standby database - one of the key features of logical standbys.
I have setup primary and logical standby databases, and they seem to be running just fine - changes are moved from the primary to the standby and queries on the standby seem to run ok.
However, If I try to create a new schema on the logical standby, that does not exist on the primary, I get "ORA-01031: insufficient privileges" errors when I try to create new objects.
Show below are the steps I have taken to create the new schema on the logical standby. Any help would be greatly appreciated.
SYS@UATDR> connect / as sysdba
Connected.
SYS@UATDR>
SYS@UATDR> select name, log_mode, database_role, guard_status, force_logging, flashback_on, db_unique_name
2 from v$database
3 /
NAME LOG_MODE DATABASE_ROLE GUARD_S FOR FLASHBACK_ON DB_UNIQUE_NAME
UATDR ARCHIVELOG LOGICAL STANDBY ALL YES YES UATDR
SYS@UATDR>
SYS@UATDR> create tablespace ts_new
2 /
Tablespace created.
SYS@UATDR>
SYS@UATDR> create user new
2 identified by new
3 default tablespace ts_new
4 temporary tablespace temp
5 quota unlimited on ts_new
6 /
User created.
SYS@UATDR>
SYS@UATDR> grant connect, resource to new
2 /
Grant succeeded.
SYS@UATDR> grant unlimited tablespace, create table, create any table to new
2 /
Grant succeeded.
SYS@UATDR>
SYS@UATDR> -- show privs given to new
SYS@UATDR> select * from dba_sys_privs where grantee='NEW'
2 /
GRANTEE PRIVILEGE ADM
NEW CREATE ANY TABLE NO
NEW CREATE TABLE NO
NEW UNLIMITED TABLESPACE NO
SYS@UATDR>
SYS@UATDR> -- create objects in schema
SYS@UATDR> connect new/new
Connected.
NEW@UATDR>
NEW@UATDR> -- prove ability to create tables
NEW@UATDR> create table new
2 (col1 number not null)
3 tablespace ts_new
4 /
create table new
ERROR at line 1:
ORA-01031: insufficient privileges
NEW@UATDR>
NEW@UATDR>

HI Daniel,
I appreciate your quick response.
My choice of name may not have been ideal, however changing new to another name - like gav - does not solve the problem.
SYS@UATDR> connect / as sysdba
Connected.
SYS@UATDR>
SYS@UATDR> select name, log_mode, database_role, guard_status, force_logging, flashback_on, db_unique_name
2 from v$database
3 /
NAME LOG_MODE DATABASE_ROLE GUARD_S FOR FLASHBACK_ON DB_UNIQUE_NAME
UATDR ARCHIVELOG LOGICAL STANDBY ALL YES YES UATDR
SYS@UATDR>
SYS@UATDR> create tablespace ts_gav
2 /
Tablespace created.
SYS@UATDR>
SYS@UATDR> create user gav
2 identified by gav
3 default tablespace ts_gav
4 temporary tablespace temp
5 quota unlimited on ts_gav
6 /
User created.
SYS@UATDR>
SYS@UATDR> grant connect, resource to gav
2 /
Grant succeeded.
SYS@UATDR> grant unlimited tablespace, create table, create any table to gav
2 /
Grant succeeded.
SYS@UATDR>
SYS@UATDR> -- show privs given to gav
SYS@UATDR> select * from dba_sys_privs where grantee='GAV'
2 /
GRANTEE PRIVILEGE ADM
GAV CREATE TABLE NO
GAV CREATE ANY TABLE NO
GAV UNLIMITED TABLESPACE NO
SYS@UATDR>
SYS@UATDR> -- create objects in schema
SYS@UATDR> connect gav/gav
Connected.
GAV@UATDR>
GAV@UATDR> -- prove ability to create tables
GAV@UATDR> create table gav
2 (col1 number not null)
3 tablespace ts_gav
4 /
create table gav
ERROR at line 1:
ORA-01031: insufficient privileges
GAV@UATDR>

Creating triggers in a logical standby database

Does anyone know if its possible to create and enable a trigger in a logical standby database on a 'guarded' table? I've been able to create the trigger (as an after insert trigger) and it appears to be valid but it never seems to fire, despite inserts taking place. Are there any other steps involved to activate this, or is it just plain not possible in a logical standby? My primary and logical standby databases are 10.2.0.3

HI Daniel,
I appreciate your quick response.
My choice of name may not have been ideal, however changing new to another name - like gav - does not solve the problem.
SYS@UATDR> connect / as sysdba
Connected.
SYS@UATDR>
SYS@UATDR> select name, log_mode, database_role, guard_status, force_logging, flashback_on, db_unique_name
2 from v$database
3 /
NAME LOG_MODE DATABASE_ROLE GUARD_S FOR FLASHBACK_ON DB_UNIQUE_NAME
UATDR ARCHIVELOG LOGICAL STANDBY ALL YES YES UATDR
SYS@UATDR>
SYS@UATDR> create tablespace ts_gav
2 /
Tablespace created.
SYS@UATDR>
SYS@UATDR> create user gav
2 identified by gav
3 default tablespace ts_gav
4 temporary tablespace temp
5 quota unlimited on ts_gav
6 /
User created.
SYS@UATDR>
SYS@UATDR> grant connect, resource to gav
2 /
Grant succeeded.
SYS@UATDR> grant unlimited tablespace, create table, create any table to gav
2 /
Grant succeeded.
SYS@UATDR>
SYS@UATDR> -- show privs given to gav
SYS@UATDR> select * from dba_sys_privs where grantee='GAV'
2 /
GRANTEE PRIVILEGE ADM
GAV CREATE TABLE NO
GAV CREATE ANY TABLE NO
GAV UNLIMITED TABLESPACE NO
SYS@UATDR>
SYS@UATDR> -- create objects in schema
SYS@UATDR> connect gav/gav
Connected.
GAV@UATDR>
GAV@UATDR> -- prove ability to create tables
GAV@UATDR> create table gav
2 (col1 number not null)
3 tablespace ts_gav
4 /
create table gav
ERROR at line 1:
ORA-01031: insufficient privileges
GAV@UATDR>

Difference between physical join and logical join

Hi Gurus,
Can anyone tell me what is the difference between physical join and logical join
Thanks,
Chandra

Hi,
A physical join is at the physical layer and defines the join between two physical tables. Logical joins live at the BMM (logical) layer and define a join between two logical tables.
The important differentiation is that at the BMM layer you do not tell the OBIEE server how to do the join, you just tell it that there is a relationship between these two logical entities. When the server comes to this logical join it will use the information in the physical joins and decides how the two logical tables are joined together.
In BMM you use complex joins to establish which logical tables are joined which another, the OBI EE server will go to the physical level to search the physical join to make the query. You can also use physical joins in the BMM to override the join in the physical layer but only in very specific conditions.
If you also set complex join in the physical layer OBI EE won't be able to construct the physical query.
Hope this answers your question.
Award points if helpful.
Thanks,
-Amith.

Physical standby and logical standby

Hi,
Why we mention standby_archive_dest and log_archive_Dest in standby init.ora.
bcz there is no activity at physical standby.so why we set two parameters?
what is difference between physical stand by and logical standby?

Hi,
A logical standby database contains the same logical information as the production database, although the physical organization and structure of the data can be different. The SQL apply technology keeps the logical standby database synchronized with the primary database by transforming redo data received from the primary database into SQL statements and then executing the SQL statements on the standby database. This makes it possible for the logical standby database to be open read-write and accessed for queries and reporting purposes at the same time the SQL is being applied to it.
Logical vs Physical Standby database
http://www.orafaq.com/node/957
Regards,
Tom
Edited by: Soli on 19.8.2009 13:48

Difference between physical and logical standby database

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