How to improve database link performance?

Hello all,
We use db links to do DML operations on remote databases. For OLTP applications we are facing performance problems for transactions dependent on data on remote database.
For legal and business reasons we cannot state all the data locally.
Could anybody suggest how to improve database links performance or suggest methods/procedures/techniques to enhance speed of OLTP applications going against remote databases ?
Thanks
Sky

AQ is as reliable as Oracle-- the guarantees about delivery of queued messages are the same as the guarantees about committed transactions (i.e. ACID). AQ is designed for asynchronous operation, though. If you are batching transactions, it sounds like you are already doing some sort of asynchronous operations-- I've generally found AQ a lot easier to administer & maintain than rolling your own batching system.
If you want to tune the Oracle side of things, you'll need to explain more about the system(s) involved here. Architecture, data flow, operations that involve the dblink, etc. If you're not comfortable posting that sort of information to a public forum, feel free to send me mail directly [email protected]
As an aside, I'm interested in how you can legally pull data from the remote system to display to your users but that you can't legally cache that data in your system via replication. Sounds like an odd constraint.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

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How to improve the query performance in to report level and designer level

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first its all based on the design of the database, universe and the report.
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How to improve query & loading performance.
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Hi Shoba
There are lot of things to improve the query and loading performance.
please refer oss note :557870 : Frequently asked questions on query performance
also refer to
weblogs:
/people/prakash.darji/blog/2006/01/27/query-creation-checklist
/people/prakash.darji/blog/2006/01/26/query-optimization
performance docs on query
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/3f66ba90-0201-0010-ac8d-b61d8fd9abe9
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This is the oss notes of FAQ on query performance
1. What kind of tools are available to monitor the overall Query Performance?
1. BW Statistics
2. BW Workload Analysis in ST03N (Use Export Mode!)
3. Content of Table RSDDSTAT
2. Do I have to do something to enable such tools?
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3. What kind of tools is available to analyze a specific query in detail?
1. Transaction RSRT
2. Transaction RSRTRACE
4. Do I have an overall query performance problem?
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ii. You need to run ST03N in expert mode to get these values
5. What can I do if the database proportion is high for all queries?
Check:
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Check whether most of your clients are connected via a WAN connection and the amount of data which is transferred is rather high.
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(Use Details to get the runtime segments)
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2. High OLAP Runtime
3. High Frontend Runtime
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2. Check if frontend PC are within the recommendation (RAM, CPU MHz)
3. Check if the bandwidth for WAN connection is sufficient
and the some threads:
how can i increse query performance other than creating aggregates
How to improve query performance ?
Query performance - bench marking
may be helpful
Regards
C.S.Ramesh
[email protected]

How to create database link from oracle to sql server

Please help with how to create database link from oracle to sql server
Best regards,
Vishal

Please help with how to create database link from oracle to sql server
Best regards,
Vishal
Hi Vishal,
I found a lof of information regarding how to create a database link from Oracle to SQL Server, please see:
https://www.google.co.in/?gws_rd=cr&ei=vd3XUvGFO8TgkAXqlYCADg#q=how+to+create+database+link+from+oracle+to+sql+server
We discuss SQL Server related issue in this forum. If you have any more question regarding Oracle, please post it in Oracle communities forum for better support.
Regards,
Elvis Long
TechNet Community Support

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For connections between 10.2 and 9.2 the 9.2 end MUST be at 9.2.0.4 or higher. Connections between 10.2 and 9.2.0.1, 9.2.0.2 or 9.2.0.3 are not supported.
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juskocf wrote:
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Your post says more by what is not provided than by what is provided. The following is the minimum list of information needed to even begin to help you.
1. What hardware (server, CPU, RAM, and NIC and HBA cards if any pointing to storage).
2. Storage solution (DAS, iSCSCI, SAN, NAS). Provide manufacturer and model.
3. If RAID which implementation of RAID and on how many disks.
4. If NAS or SAN how is the read-write cache configured.
5. What version of Oracle software ... all decimal points ... for example 11.1.0.6. If you are not fully patched then patch it and try again before asking for help.
6. What, in addition to the Oracle database, is running on the server?
2MB/sec. is very little. That is equivalent to inserting 500 VARCHAR2(4000)s. If I couldn't do 500 inserts per second on my laptop I'd trade it in.
SQL> create table t (
2 testcol varchar2(4000));
Table created.
SQL> set timing on
SQL> BEGIN
2    FOR i IN 1..500 LOOP
3      INSERT INTO t SELECT RPAD('X', 3999, 'X') FROM dual;
4    END LOOP;
5 END;
6 /
PL/SQL procedure successfully completed.
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How to improve slow PowerPivot performance when adding/modifying measures, calculated columns or Relationships?

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In the status bar of excel I get a very quick 'calculating', then it spends a lot of time 'reading data',
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To give you an idea of where my data comes from, I have:
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Hardware wise I am using:
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- Intel Core i7 processor
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Thanks,
James

Darren,
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Hi James,
If you download one the ODBC MySQL Connectors
http://dev.mysql.com/downloads/connector/odbc/ and I believe yours is the first one for x64 systems and connect directly to the data you should be able to reduce the number of workbooks your opening and if you notice in the following graphic these
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After registering the ODBC Driver
Click Add. on the User-DSN sheet, choose the “MySQL ODBC 5.x driver”, fill in the credentials, choose a database (from the select menu) and a data source name and you’re done.
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Cheers,
Ivan
Ivan Sanders <a href="http://www.linkedin.com/in/iasanders">My LinkedIn </a> , <a href="http://msmvps.com/blogs/ivansanders">My Blog</a>, <a href="http://twitter.com/iasanders"> @iasanders</a>,
<a href="http://shop.oreilly.com/product/0790145372703.do">BI in SP2013</a>, <a href="http://sharepointdemobuilds.codeplex.com">SP2013 Content Packs</a>.

How to improve stored procedure performance?

hi,
Suppose I have a stored procedure which contains 30 insert/update statements. How do I know Stored Procedure is slowly running or don't have any performance issue? how to improve performance?
Thanks in advance.
Anujit Karmakar Sr. Software Engineer

Stored Procedures Optimization Tips
Use stored procedures instead of heavy-duty queries.
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Include the SET NOCOUNT ON statement into your stored procedures to stop the message indicating the number of rows affected by a Transact-SQL statement.
This can reduce network traffic, because your client will not receive the message indicating the number of rows affected by a Transact-SQL statement.
Call stored procedure using its fully qualified name.
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Consider returning the integer value as an RETURN statement instead of an integer value as part of a recordset.
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Don't use the prefix "sp_" in the stored procedure name if you need to create a stored procedure to run in a database other than the master database.
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Use the sp_executesql stored procedure instead of the EXECUTE statement.
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Use sp_executesql stored procedure instead of temporary stored procedures.
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stored procedure instead of temporary stored procedures to have a better chance to reuse the execution plans.
If you have a very large stored procedure, try to break down this stored procedure into several sub-procedures, and call them from a controlling stored procedure.
The stored procedure will be recompiled when any structural changes were made to a table or view referenced by the stored procedure (for example, ALTER TABLE statement), or when a large number of INSERTS, UPDATES or DELETES are made to a table referenced by
a stored procedure. So, if you break down a very large stored procedure into several sub-procedures, you get chance that only a single sub-procedure will be recompiled, but other sub-procedures will not.
Try to avoid using temporary tables inside your stored procedure.
Using temporary tables inside stored procedure reduces the chance to reuse the execution plan.
Try to avoid using DDL (Data Definition Language) statements inside your stored procedure.
Using DDL statements inside stored procedure reduces the chance to reuse the execution plan.
Add the WITH RECOMPILE option to the CREATE PROCEDURE statement if you know that your query will vary each time it is run from the stored procedure.
The WITH RECOMPILE option prevents reusing the stored procedure execution plan, so SQL Server does not cache a plan for this procedure and the procedure is recompiled at run time. Using the WITH RECOMPILE option can boost performance if your query will vary
each time it is run from the stored procedure because in this case the wrong execution plan will not be used.
Use SQL Server Profiler to determine which stored procedures has been recompiled too often.
To check the stored procedure has been recompiled, run SQL Server Profiler and choose to trace the event in the "Stored Procedures" category called "SP:Recompile". You can also trace the event "SP:StmtStarting" to see at what point
in the procedure it is being recompiled. When you identify these stored procedures, you can take some correction actions to reduce or eliminate the excessive recompilations.
http://www.mssqlcity.com/tips/stored_procedures_optimization.htm
Ahsan Kabir Please remember to click Mark as Answer and Vote as Helpful on posts that help you. This can be beneficial to other community members reading the thread. http://www.aktechforum.blogspot.com/

How to create Database link

Hi all,
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Thanks
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Hi Grishma,
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Dimitri

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Hello Everyone,
Here i have Oracle Database 9i and SQL Server 2005 databases.
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Thanks,

Thanks for Everyone,
I was struggle with this almost 10 days....
I created Database link from Oracle to SQL Server
Now it is fine.........
Here i am giving my servers configuration and proceedure how i created the db link...@
Using Generic Connectivity (HSODBC) we can create db link between Oracle and SQL server.
Machine (1)
DB Version : Oracle 9.2.0.7.0
Operating System : HP-UX Itanuim 64 11.23
IP : 192.168.0.31
Host : abcdbt
Machine (2)
Version : SQL Server 2005
Operating System : Windows server 2003 x86
IP : 192.168.0.175
Host : SQLDEV1
User/PW : sa/abc@123! (Connect to database)
Database : SQLTEST (exsisting)
Table : T (“ T “ is the table existing in SQLTEST database with 10 rows)
Prerequisites in Machine (2):
a)     Oracle 10g software
b)     User account to access SQL Server database (sa/abc@123!)
c)     Existing SQL Server Database (SQLTEST)
d) Tables (testing purpose) (T)
Steps:
1)     Install Oracle 10.2.0.1 (Only SW,No need of database) *(Machine 2)*
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Control panel >> Administrative Tools >> Data Source (ODBC) >> System DSN ADD
You can follow this link also.....
http://www.databasejournal.com/features/oracle/article.php/3442661/Making-a-Connection-from-Oracle-to-SQL-Server.htm
I created DSN as
DSN name : SQLTEST
User : SA/abc@123! (Existing user account)
Host : 192.168.0.175 (machine 2)
Already I have 1 database in SQL Server with the name SQLTEST
You can create DSN with different name also (not same as db name also)
3)     Create a hsodbc init file in $ORACLE_HOME\hs\admin *(Machine 2)*
Create init<DSN NAME> file
Ex: initSQLTEST
Copy inithsodbc to initSQLTEST
And edit
initSQLTEST file
HS_FDS_CONNECT_INFO = SQLTEST    <DSN NAME>*
HS_FDS_TRACE_LEVEL = OFF*
save the file....@
4)     Configure Listener.ora *(Machine 2)*
LISTENER_NEW =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.175)(PORT = 1525))
SID_LIST_LISTENER_NEW =
(SID_LIST =
(SID_DESC =
(SID_NAME = SQLTEST) *+< Here SQLTEST is DSN NAME >+*
(ORACLE_HOME = G:\oracle 10g\oracle\product\10.2.0\db_1)
(PROGRAM = hsodbc))
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = G:\oracle 10g\oracle\product\10.2.0\db_1)
(PROGRAM = extproc) )
:> lsnrctl start LISTENER_NEW
5)     Configure tnsname.ora *(Machine 2)*
SQLTEST11 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.175)(PORT = 1525))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = SQLTEST))
(HS=OK)
:> tnsping SQLTEST11
If No errors then conti….
6)     Configure a file *(Machine 1)*
Cd $TNS_ADMIN ($ORACLE_HOME/network/admin)
Create a file
$ vi TEST_abcdbt_ifile.ora
something=
(DESCRIPTION=
(ADDRESS=(PROTOCOL=tcp)(HOST =192.168.0.175) (PORT=1525))
(CONNECT_DATA=
(SID=SQLTEST))
(HS=OK)
$ tnsping something
$ sqlplus system/manager
Your connected to Oracle database *(machine 1)*
create database link xyz connect to “sa” identified by “abc@123!” using ‘SOMETHING’;
select * from t@xyz;10 rows selected.
Thanks,
Edited by: ram5424 on Feb 10, 2010 7:24 PM

How to complie database link in forms 6i

Dear All,
how can i compile database link in forms 6i ??
Mujtaba

follow the below step to connect database from 6i forms.
Open C:\orant\net80\admin\tnsnames.ora in notepad as below.
ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = servername)(PORT = 1521))
(CONNECT_DATA = (SID = ORCL))
)look orcl as above in host put your servername or IP address where database installed . restart the pc and connect with scott/tiger@orcl.
Hope it helps.
Regards
Moazam

How to create database links

Hi,
We have two databases on two differenet servers and we want both of the databases to be synched and application is running only on one server.
Is it possible through DB links if yes then how.
If any better solution than DB links is there then pl tell.

850520 wrote:
I think DATA GUARD is good from recovery point of view..but i want that my application will update one database & same data will be updated on 2nd DB automatically means application need not to update second database by querying it..
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How to improve the query performance

ALTER PROCEDURE [SPNAME]
@Portfolio INT,
@Program INT,
@Project INT
AS
BEGIN
--DECLARE @StartDate DATETIME
--DECLARE @EndDate DATETIME
--SET @StartDate = '11/01/2013'
--SET @EndDate = '02/28/2014'
IF OBJECT_ID('tempdb..#Dates') IS NOT NULL
DROP TABLE #Dates
IF OBJECT_ID('tempdb..#DailyTasks') IS NOT NULL
DROP TABLE #DailyTasks
CREATE TABLE #Dates(WorkDate DATE)
--CREATE INDEX IDX_Dates ON #Dates(WorkDate)
;WITH Dates AS
SELECT (@StartDate) DateValue
UNION ALL
SELECT DateValue + 1
FROM Dates
WHERE DateValue + 1 <= @EndDate
INSERT INTO #Dates
SELECT DateValue
FROM Dates D
LEFT JOIN tb_Holidays H
ON H.HolidayOn = D.DateValue
AND H.OfficeID = 2
WHERE DATEPART(dw,DateValue) NOT IN (1,7)
AND H.UID IS NULL
OPTION(MAXRECURSION 0)
SELECT TSK.TaskID,
TR.ResourceID,
WC.WorkDayCount,
(TSK.EstimateHrs/WC.WorkDayCount) EstimateHours,
D.WorkDate,
TSK.ProjectID,
RES.ResourceName
INTO #DailyTasks
FROM Tasks TSK
INNER JOIN TasksResource TR
ON TSK.TaskID = TR.TaskID
INNER JOIN tb_Resource RES
ON TR.ResourceID=RES.UID
OUTER APPLY (SELECT COUNT(*) WorkDayCount
FROM #Dates
WHERE WorkDate BETWEEN TSK.StartDate AND TSK.EndDate)WC
INNER JOIN #Dates D
ON WorkDate BETWEEN TSK.StartDate AND TSK.EndDate
-------WHERE TSK.ProjectID = @Project-----
SELECT D.ResourceID,
D.WorkDayCount,
SUM(D.EstimateHours/D.WorkDayCount) EstimateHours,
D.WorkDate,
T.TaskID,
D.ResourceName
FROM #DailyTasks D
OUTER APPLY (SELECT (SELECT CAST(TaskID AS VARCHAR(255))+ ','
FROM #DailyTasks DA
WHERE D.WorkDate = DA.WorkDate
AND D.ResourceID = DA.ResourceID
FOR XML PATH('')) AS TaskID) T
LEFT JOIN tb_Project PRJ
ON D.ProjectID=PRJ.UID
INNER JOIN tb_Program PR
ON PRJ.ProgramID=PR.UID
INNER JOIN tb_Portfolio PF
ON PR.PortfolioID=PF.UID
WHERE (@Portfolio = -1 or PF.UID = @Portfolio)
AND (@Program = -1 or PR.UID = @Program)
AND (@Project = -1 or PRJ.UID = @Project)
GROUP BY D.ResourceID,
D.WorkDate,
T.TaskID,
D.WorkDayCount,
D.ResourceName
HAVING SUM(D.EstimateHours/D.WorkDayCount) > 8
hi..
My SP is as above..
I connected this SP to dataset in SSRS report..as per my logic..Portfolio contains many Programs and Program contains many Projects.
When i selected the ALL value for parameters Program and Project..i'm unable to get output.
but when i select values for all 3 parameters i'm getting output. i took default values for paramters also.
so i commented the where condition in SP as shown above
--------where TSK.ProjectID=@Project-------------
now i'm getting output when selecting ALL value for parameters.
but here the issue is performance..it takes 10sec to retrieve for single project when i'm executing the sp.
how can i create index on temp table in this sp and how can i improve the query performance..
please help.
thanks in advance..
lucky

Didnt i provide you solution in other thread?
ALTER PROCEDURE [SPNAME]
@Portfolio INT,
@Program INT,
@Project INT
AS
BEGIN
--DECLARE @StartDate DATETIME
--DECLARE @EndDate DATETIME
--SET @StartDate = '11/01/2013'
--SET @EndDate = '02/28/2014'
IF OBJECT_ID('tempdb..#Dates') IS NOT NULL
DROP TABLE #Dates
IF OBJECT_ID('tempdb..#DailyTasks') IS NOT NULL
DROP TABLE #DailyTasks
CREATE TABLE #Dates(WorkDate DATE)
--CREATE INDEX IDX_Dates ON #Dates(WorkDate)
;WITH Dates AS
SELECT (@StartDate) DateValue
UNION ALL
SELECT DateValue + 1
FROM Dates
WHERE DateValue + 1 <= @EndDate
INSERT INTO #Dates
SELECT DateValue
FROM Dates D
LEFT JOIN tb_Holidays H
ON H.HolidayOn = D.DateValue
AND H.OfficeID = 2
WHERE DATEPART(dw,DateValue) NOT IN (1,7)
AND H.UID IS NULL
OPTION(MAXRECURSION 0)
SELECT TSK.TaskID,
TR.ResourceID,
WC.WorkDayCount,
(TSK.EstimateHrs/WC.WorkDayCount) EstimateHours,
D.WorkDate,
TSK.ProjectID,
RES.ResourceName
INTO #DailyTasks
FROM Tasks TSK
INNER JOIN TasksResource TR
ON TSK.TaskID = TR.TaskID
INNER JOIN tb_Resource RES
ON TR.ResourceID=RES.UID
OUTER APPLY (SELECT COUNT(*) WorkDayCount
FROM #Dates
WHERE WorkDate BETWEEN TSK.StartDate AND TSK.EndDate)WC
INNER JOIN #Dates D
ON WorkDate BETWEEN TSK.StartDate AND TSK.EndDate
WHERE (TSK.ProjectID = @Project OR @Project = -1)
SELECT D.ResourceID,
D.WorkDayCount,
SUM(D.EstimateHours/D.WorkDayCount) EstimateHours,
D.WorkDate,
T.TaskID,
D.ResourceName
FROM #DailyTasks D
OUTER APPLY (SELECT (SELECT CAST(TaskID AS VARCHAR(255))+ ','
FROM #DailyTasks DA
WHERE D.WorkDate = DA.WorkDate
AND D.ResourceID = DA.ResourceID
FOR XML PATH('')) AS TaskID) T
LEFT JOIN tb_Project PRJ
ON D.ProjectID=PRJ.UID
INNER JOIN tb_Program PR
ON PRJ.ProgramID=PR.UID
INNER JOIN tb_Portfolio PF
ON PR.PortfolioID=PF.UID
WHERE (@Portfolio = -1 or PF.UID = @Portfolio)
AND (@Program = -1 or PR.UID = @Program)
AND (@Project = -1 or PRJ.UID = @Project)
GROUP BY D.ResourceID,
D.WorkDate,
T.TaskID,
D.WorkDayCount,
D.ResourceName
HAVING SUM(D.EstimateHours/D.WorkDayCount) > 8
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