Oracle Best Practices Discussion Pros/Cons of using Synonyms

Please share your experience given the Pros/Cons of Developing Enterprise Database Applications using public and private Synonyms.
My recommendation to developers on my team is to avoid using Public Synonyms in their code and instead Fully Qualify the database object by schema owner.
Pros: When you drop a schema, you do not drop the public synonyms that they created. Therefore if you have to use synonym, make it private and not public.
Please share your experience!

Fahd Mirza wrote:
Well I rarely use public synonyms and that only case of db links. For example, I have a scenario, in which I have hooked up a MS SQLSERVER database with Oracle database through Heterogenous Services. I am accessing the SQLSERVER table in real time, through HS, in Oracle in real time, and then from this Oracle environment I have created db links to many other interested databases. In those interested database, I have created public synonyms over those dblinks.
It's so transparent for the interested databases. But I have documented this whole configuration in great detail for any upcoming DBA, just in case I leave, or expire or anything. Sounds interesting - this might be worth 'cleaning' and publishing to OTN's Articles. If you are interested in pursuing this, you might want to contact Justin (Community Forum) or myself ([email protected])

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Where does one find the Oracle Best Practice/recommendations for how to DR

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We have configured all the other Oracle FMW components as per the Oracle DR EDG guides. Basically using the Host ip name/aliasing concept to ‘trick’ the secondary site into thinking
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user8804554 wrote:
Hi all,
I m currently testing external components with Windows Server and I want to test Oracle 11g R2.
The only resource I have is this website and the only binaries seem to be for Linux OS.You have one other HUGE resource that, while it won't answer your current question, you'd better start getting familiar with if you are going to use Oracle. That is the complete and official documentation, found at tahiti.oracle.com
>
Does anybody know how I can upgrade my Oracle 11.1.0.7 version to the R2 release?
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Pros & Cons of Using SAP PI Interfaces for Report Generation

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I have a Scenario's like
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I want to know the Pros & cons of using SAP PI RFC/Proxy adapter interface to get the data from the legacy system for each time the user execute the report in SAP ECC.
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What oracle best practices in mapping budgeting to be implement at item

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Case:
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Hi,
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PRO & Cons of using treasury management

Hi,
I am trying to implement the treasury management, could someone tell me the PRO & Cons of using treasury management?
thanks,
Liang

Hi,
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Oracle Best Practices for generating Transactions IDs in high OLTP systems

We are in the process of designing a high OLTP system using Oracle 11g Database with the following NFRs:
1) 1 million transactions per day
2) 100,000 concurrent users
There are close to about 160-180 entities in the database and we want to know the best approach/practice in deriving the transaction IDs for the OLTP system. Our preferences are given below:
1) Use Oracle Sequence starting with 1,000,000,000 (1 billion) - This is to make the TXN ID look meaningful when it starts with 1 billion instead of starting it with 1.
2) Use timestamp and cast it to number instead of using Oracle sequence.
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I would like to know pros/cons of the above methods and their impacts on performance. Also, appreciate if you could share any any best practices/methods that Oracle supports.
Thanks in advance.
Ken R

Ken R wrote:
I did a quick PoC using both Oracle Sequence & Timestamp for 1 million inserts in a Non-RAC environment. Code used is given below:
create sequence testseq start with 1 cache 10000 order;
create table test1 (txnid number, txndate timestamp(9));
create table test2 (txnid number, txndate timestamp(9));
begin
for i in 1..1000000
loop
insert into test1 values(testseq.nextval,systimestamp(9));
end loop;
commit;
end;
begin
for i in 1..1000000
loop
insert into test2 values(to_number(to_char(systimestamp(9),'yyyymmddhh24missff9')), systimestamp(9));
end loop;
commit;
end;
Here are the results:
select max(txndate)-min(txndate) from test1;
Result >> 0 0:3:3.514891000
select max(txndate)-min(txndate) from test2;
Result >> 0 0:1:32.386923000
It appears that Timestamp is faster than sequence... Any thought is highly appreciated...Interesting that your sequence timing is so slow. You say this was a non-RAC environment, but I wonder if you had Oracle linked in RAC mode even though you were running single instance - this would result in the ORDERed sequence running through RAC's "DFS Lock Handle" mechanism which might account for the timing anomaly.
Unfortunately your test is not particularly relevant. As DomBrooks points out there are lots of problems with sequence-based or time-based columns, especially in RAC, and most particularly if you think you want a "no-gap" sequence. On top of this, of course, your test doesn't include an index on the relevant column, and it's single user and doesn't test for any concurrency effects.
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Regards
Jonathan Lewis

Any Oracle best practice/standards for inter-DataCente links for Oracle RAC

Hello Oracle Experts,
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Abhijit

Hi ,
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Thanks,
Srinath

Require official Oracle Best Practices about PSU patches

A customer complained about the following
Your company statements are not clear...
On your web page - http://www.oracle.com/security/critical-patch-update.html
The following is stated!
Critical Patch Update
Fixes for security vulnerabilities are released in quarterly Critical Patch Updates (CPU), on dates announced a year in advance and published on the Oracle Technology Network. The patches address significant security vulnerabilities and include other fixes that are prerequisites for the security fixes included in the CPU.
The major products patched are Oracle Database Server, Oracle Application Server, Oracle Enterprise Manager, Oracle Collaboration Suite, Oracle E-Business Suite, PeopleSoft Enterprise Tools, PeopleSoft CRM, JD Edwards EnterpriseOne, JD Edwards OneWorld XE, Oracle WebLogic Suite, Oracle Communications and Primavera Product Suite.
Oracle recommends that CPUs be the primary means of applying security fixes to all affected products as they are released more frequently than patch sets and new product releases.
BENEFITS
* Maximum Security—Vulnerabilities are addressed through the CPU in order of severity. This process ensures that the most critical security holes are patched first, resulting in a better security posture for the organization.
* Lower Administration Costs—Patch updates are cumulative for many Oracle products. This ensures that the application of the latest CPU resolves all previously addressed vulnerabilities.
* Simplified Patch Management—A fixed CPU schedule takes the guesswork out of patch management. The schedule is also designed to avoid typical "blackout dates" during which customers cannot typically alter their production environments.
PROGRAM FEATURES
* Cumulative versus one-off patches—The Oracle Database Server, Oracle Application Server, Oracle Enterprise Manager, Oracle Collaboration Suite, Oracle Communications Suite and Oracle WebLogic Suite patches are cumulative; each Critical Patch Update contains the security fixes from all previous Critical Patch Updates. In practical terms, the latest Critical Patch Update is the only one that needs to be applied if you are solely using these products, as it contains all required fixes. Fixes for other products, including Oracle E-Business Suite, PeopleSoft Enterprise Tools, PeopleSoft CRM, JD Edwards EnterpriseOne, and JD Edwards OneWorld XE are released as one-off patches, so it is necessary to refer to previous Critical Patch Update advisories to find all patches that may need to be applied.
* Prioritizing security fixes—Oracle fixes significant security vulnerabilities in severity order, regardless of who found the issue—whether the issue was found by a customer, a third party security researcher or by Oracle.
* Sequence of security fixes—Security vulnerabilities are first fixed in the current code line. This is the code being developed for a future major release of the product. The fixes are scheduled for inclusion in a future Critical Patch Update. However, fixes may be backported for inclusion in future patch sets or product releases that are released before their inclusion in a future Critical Patch Update.
* Communication policy for security fixes—Each Critical Patch Update includes an advisory. This advisory lists the products affected by the Critical Patch Update and contains a risk matrix for each affected product.
* Security alerts—Security alerts provide a notification designed to address a single bug or a small number of bugs. Security Alerts have been replaced by scheduled CPUs since January 2005. Unique or dangerous threats can still generate Security Alert email notifications through MetaLink and the Oracle Technology Network.
Nowhere in that statement is the Patch Set Update even mentioned. If Oracle intends to recommend to all customers that Patch Set Updates are the recommended means of Patching for Security and Functionality then it should be stated so here!
Please clarify!
Where can I find the current information so that I can use to Official Oracle statement as a reference for my Enterprise Practices and Standards document? The individual patch package references you are giving me do not state Oracle recommended Best Practice, they only speak to the specific patch package they describe. These do not help me in making an Enterprise statement of Practices and Standards.
I need to close the process out to capture a window of availability for Practices and Standards approval.
Do we have any Best Practice document about PSU patches available for customers?

cnawrati wrote:
A customer complained about the following
Your company statements are not clear...
On your web page - http://www.oracle.com/security/critical-patch-update.html
Who is the "your" to which you are referring?
<snip>
Nowhere in that statement is the Patch Set Update even mentioned. If Oracle intends to recommend to all customers that Patch Set Updates are the recommended means of Patching for Security and Functionality then it should be stated so here!Um. OK
Please clarify!
Of whom are you asking for a clarification?
Where can I find the current information so that I can use to Official Oracle statement as a reference for my Enterprise Practices and Standards document? The individual patch package references you Who is the "you" to which you refer?
are giving me do not state Oracle recommended Best Practice, they only speak to the specific patch package they describe. These do not help me in making an Enterprise statement of Practices and Standards.
I need to close the process out to capture a window of availability for Practices and Standards approval.
Be our guest.
Do we What do you mean "we", Kemosabi?
have any Best Practice document about PSU patches available for customers?This is a very confusing posting, but overall it looks like you are under the impression that this forum is some kind of channel for communicating back to Oracle Crop anything that happens to be on your mind about their corporate web site and/or policies and practices. Please be advised that this forum is simply a platform provided BY Oracle Corp as a peer operated user support group. No one here is responsible for anything on any Oracle web site. No one here is responsible for any content anywhere in the oracle.com domain, outside of their own personal posting on this forum. In other words, you can complain all you want about Oracle's policy, practice, and support, but "there's no one here but us chickens."

Best Practices on OWB/ODI when using Asynchronous Distributed HotLog Mode

Hello OWB/ODI:
I want to get some advice on best practices when implementing OWB/ODI mappings to handle Oracle Asynchronous Distributed HotLog CDC (change data capture), specifically for “updates”.
Under Asynchronous Distributed HotLog mode, if a record is changed in a given source table, only the column that has been changed is populated in the CDC table with the old and new value, and all other columns with the exception of the keys are populated with NULL values.
In order to process this update with an OWB or ODI mapping, I need to compare the old value (UO) against the new value (UN) in the CDC table. If both the old and the new value are NOT the same, then this is the updated column. If both the old and the new value are NULL, then this column was not updated.
Before I apply a row-update to my destination table, I need to figure out the current value of those columns that have not been changed, and replace the NULL values with its current value. Otherwise, my row-update will replace with nulls those columns that its value has not been changed. This is where I am looking for an advise on best practices. Here are the possible 2 solutions I can come up with, unless you guys have a better suggestion on how to handle “updates”:
About My Environment: My destination table(s) are part of a dimensional DW database. My only access to the source database is via Asynchronous Distributed HotLog mode. To build the datawarehouse, I will create initial mappings in OWB or ODI that will replicate the source tables into staging tables. Then, I will create another set of mappings to transform and load the data from the staging tables into the dimension tables.
Solution #1: Use the staging tables as lookup tables when working with “updates”:
1.     Create an exact copy of the source tables into a staging environment. This is going to be done with the initial mappings.
2.     Once the initial DW database is built, keep the staging tables.
3.     Create mappings to maintain the staging tables using as source the CDC tables.
4.     The staging tables will always be in sync with the source tables.
5.     In the dimension load mapping, “join” the staging tables, and identify “inserts”, “updates”, and “deletes”.
6.     For “updates”, use the staging tables as lookup tables to get the current value of the column(s) that have not been changed.
7.     Apply the updates in the dimension tables.
Solution #2: Use the dimension tables as lookup tables when working with “updates”:
1.     Delete the content of the staging tables once the initial datawarehouse database has been built.
2.     Use the empty staging tables as a place to process the CDC records
3.     Create mappings to insert CDC records into the staging tables.
4.     The staging tables will only contain CDC records (i.e. new records, updated records, and deleted records)
8.     In the dimension load mapping, “outer join” the staging tables, and identify “inserts”, “updates”, and “deletes”.
5.     For “updates”, use the dimension tables as lookup tables to get the current value of a column(s) that has not been changed.
6.     Apply the updates in the dimension tables.
Solution #1 uses staging tables as lookup tables. It requires extra space to store copies of source tables in a staging environment, and the dimension load mappings may take longer to run because the staging tables may contain many records that may never change.
Solution #2 uses the dimension tables as both the lookup tables as well as the destination tables for the “updates”. Notice that the dimension tables will be updated with the “updates” AFTER they are used as lookup tables.
Any other approach that you guys may suggest? Do you see any other advantage or disadvantage against any of the above solutions?
Any comments will be appreciated.
Thanks.

hi,
can you please tell me how to make the JDBC call. I triedit as:
1. TopicConnectionFactory tc_fact = AQjmsFactory.getTopicConnectionFactory(host, SID, Integer.parseInt(port), "jdbc:oracle:thin");
and
2. TopicConnectionFactory tc_fact = AQjmsFactory.getTopicConnectionFactory(host, SID, Integer.parseInt(port), "thin");
-as given in http://www.acs.ilstu.edu/docs/oracle/server.101/b10785/jm_opers.htm#CIHJHHAD
The 1st one is giving the error:
Caused by: oracle.jms.AQjmsException: JMS-135: Driver jdbc:oracle:thin not supported
at oracle.jms.AQjmsError.throwEx(AQjmsError.java:330)
at oracle.jms.AQjmsTopicConnectionFactory.<init>(AQjmsTopicConnectionFactory.java:96)
at oracle.jms.AQjmsFactory.getTopicConnectionFactory(AQjmsFactory.java:240)
at com.ivy.jms.JMSTopicDequeueHandler.init(JMSTopicDequeueHandler.java:57)
The 2nd one is erroring out:
oracle.jms.AQjmsException: JMS-225: Invalid JDBC driver - OCI driver must be used for this operation
at oracle.jms.AQjmsError.throwEx(AQjmsError.java:288)
at oracle.jms.AQjmsConsumer.dequeue(AQjmsConsumer.java:1307)
at oracle.jms.AQjmsConsumer.receiveFromAQ(AQjmsConsumer.java:1028)
at oracle.jms.AQjmsConsumer.receiveFromAQ(AQjmsConsumer.java:951)
at oracle.jms.AQjmsConsumer.receiveFromAQ(AQjmsConsumer.java:929)
at oracle.jms.AQjmsConsumer.receive(AQjmsConsumer.java:781)
at com.ivy.jms.JMSTopicDequeueHandler.receiveMessages(JMSTopicDequeueHandler.java:115)
at com.ivy.jms.JMSManager.run(JMSManager.java:90)
at java.lang.Thread.run(Thread.java:619)
Is anything else beyond this is required??? please help. :(
oracle: 10g R4
linux environment and java is trying to do AQjmsFactory.getTopicConnectionFactory(...); Java machine is diffarent from the database and no oracle client is to be installed on java machine.
The same code is working fine when i use oc8i instead of thin drivers and run it on db machine.
ravi

Oracle Best practices for changing Byte to Char on Varchar2 columns

Dear Team,
Application Team wanted to change Byte to Char on Varchar2 columns to accommodate Multi byte character on couple of production tables.
Wanted to know is it safe to have mixture of BYTE and CHAR semantics in the same table i have read on the couple of documents that It's good practice to avoid using a mixture of BYTE and CHAR semantics columns in the same table.
What happens if we have mixture of BYTE and CHAR semantics columns in the same table?
Do we need to gather stats & rebuild indexes on the table after these column changes .
Thanks in Advance !!!
SK

Application Team wanted to change Byte to Char on Varchar2 columns to accommodate Multi byte character on couple of production tables.
Wanted to know is it safe to have mixture of BYTE and CHAR semantics in the same table i have read on the couple of documents that It's good practice to avoid using a mixture of BYTE and CHAR semantics columns in the same table.
No change is needed to 'accommodate Multibyte characters'. That support has NOTHING to do with whether a column is specified using BYTE or CHAR.
In 11g the limit for a VARCHAR2 column is 4000 bytes, period. If you specify CHAR and try to insert 1001 characters that each take 4 bytes you will get an exception since that would require 4004 bytes and the limit is 4000 bytes.
In practice the use of CHAR is mostly a convenience to the developer when defining columns for multibyte characters. For example for a NAME column you might want to make sure Oracle will allocate room for 50 characters REGARDLESS of the actual length in bytes.
If you provide a name of 50 one byte characters then only 50 bytes will be used. Provide a name of 50 four byte characters and 200 bytes will be used.
So if that NAME column was defined using BYTE how would you know what length to use for the column? Fifty BYTES will seldom be long enough and 200 bytes SEEMS large since the business user wants a limit of FIFTY characters.
That is why such columns would typically use CHAR; so that the length (fifty) defined for the column matches the logical length of the number of characters.
What happens if we have mixture of BYTE and CHAR semantics columns in the same table?
Nothing happens - Oracle could care less.
Do we need to gather stats & rebuild indexes on the table after these column changes .
No - not if you by 'need' you mean simply because you made ONLY that change.
But that begs the question: if the table already exists, has data and has been in use without their being any problems then why bother changing things now?
In other words: if it ain't broke why try to fix it?
So back to your question of 'best practices'
Best practices is to set the length semantics at the database level when the database is first created and to then use that same setting (BYTE or CHAR) when you create new objects or make DDL changes.
Best practices is also to not fix things that aren't broken.
See the 'Length Semantics' section of the globalization support guide for more best practices
http://docs.oracle.com/cd/E11882_01/server.112/e10729/ch2charset.htm#i1006683

Oracle Best Practices in 10g When Disabling NUMA

We have both Linux and Solaris 10 DB servers running 10g on them with NUMA. What is Oracle's best practice for dealing with NUMA in hardware when it can be disabled?

user10387007 wrote:
We have both Linux and Solaris 10 DB servers running 10g on them with NUMA. What is Oracle's best practice for dealing with NUMA in hardware when it can be disabled?How are you using NUMA (Non Uniformed Memory Access)?
NUMA can be implemented at CPU level - in which case CPU affinity becomes important. NUMA can be used across an Interconnect (e.g. SCSI over RDMA protocol).
So it depends on what you mean by NUMA and how you are using it (and whether or not it is used by the Oracle s/w stack itself).

Best practice for Video over IP using ISDN WAN

I am looking for the best practice to ensure that the WAN has suffient active ISDN channels to support the video conference connection.
Reliance on load threshold either -
Takes to long for the ISDN calls to establish causing the problems for video setup
- or is too fast to place additional ISDN calls when only data is using the line
What I need is for the ISDN calls to be pre-established just prior to the video call. Have done this in the past with the "ppp multilink links minimum commmand but this manual intervention isn't the preferred option in this case
thanks

This method is as secure as the password: an attacker can see
the hashed value, and you must assume that they know what has been
hashed, with what algorithm. Therefore, the challenge in attacking
this system is simply to hash lots of passwords until you get one
that gives the same value. Rainbow tables may make this easier than
you assume.
Why not use SSL to send the login request? That encrypts the
entire conversation, making snooping pointless.
You should still MD5 the password so you don't have to store
it unencrypted on the server, but that's a side issue.

Oracle Best Practices Discussion Pros/Cons of using Synonyms

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