Performance using union
I am using union of around 6 queries in a report. The same query in the database runs faster where as the report takes long time. Please suggest what can be done.
thanks,
deep
Since union does an extra sort it has a performance difference compared to union all.
SQL> select user from dual union select user from dual ;
USER
HR
SQL> select user from dual union all select user from dual ;
USER
HR
HRİf there is up to date and appropriate object statistics Oracle's Cost Based Optimizer will choose best access path, join method and join order depending on your query. Only exceptions are hints, outlines and sql profiles since they stabilize the execution plan.
For further commenting please post your oracle version, query's test results and its statistics taken from sql*plus timing and autotrace options - http://www.bhatipoglu.com/entry/17/oracle-performance-analysis-tracing-and-performance-evaluation
Similar Messages
-
Hello
i have 2 schemas S1 and S2 containing complex relational tables. The tables in each schema are related to each other via foreign key relationships. i made views for feature tables in both the schemas , querying column values from their related tables.
the data structure in both the schemas are exactly the same. Dut to management reasons we have to split them in 2 schemas. S1 contain data for region A and S2 contains data from region B. Now the client wants to see a combined data from region A & B.
we are planning to create another schema S3 and make views combining views from S1 and S2 in both schemas (V1 in S1 + V1 in S2) using UNION ALL.
Does UNION ALL will make use of the indexes we already built for parent tables in S1 and S2? Will there be a performance degradation using this approach? What can be the best approach? Our client needs to see real time data....
regards
samSince union does an extra sort it has a performance difference compared to union all.
SQL> select user from dual union select user from dual ;
USER
HR
SQL> select user from dual union all select user from dual ;
USER
HR
HRİf there is up to date and appropriate object statistics Oracle's Cost Based Optimizer will choose best access path, join method and join order depending on your query. Only exceptions are hints, outlines and sql profiles since they stabilize the execution plan.
For further commenting please post your oracle version, query's test results and its statistics taken from sql*plus timing and autotrace options - http://www.bhatipoglu.com/entry/17/oracle-performance-analysis-tracing-and-performance-evaluation -
How do I write a Dll to perform a union in visual studio for use in LabVIEW?
Hello,
I'm new to writing dll(s). I'm attempting to write a Dll that will perform a union on a number from LabVIEW and then return the result to LabVIEW for my use. I've been struggling with this for a few days and I'm finally giving in to get some help.
This screenshot is the only description that I have to help me with what I am trying to do. Basically, I'm trying to pass a value that will be different based on a measured partial discharge value. In the screen below, the value used is "1061111989" This number is my reading. I need to pass this value from labVIEW into my dll to perform a union on it.
In my Dll, I need to write MeterReading.IntVal's value and get the MeterReading.FloatVal back.
I have Visual Studio 2012 Full and LabVIEW 2012 Full, I'm LabVIEW CLAD and I've written 17 test floors in the US to date; however, I've never had any need of Visual Studio until now. Can anyone help me out with this?
Thanks in advance, -Chris
-Chris
"You must be some sort of an engineer?" -Close Friend
Solved!
Go to Solution.Sometimes, I try to solve simple issues in very complicated ways. What got me so confused here was the solution from the engineer of the device that I am reading from was using a union to get the value. I'm not familiar with unions so I thought that it was some structure that was not creatable in LabVIEW. Anyways, a typecast to single point gave me the proper value. Thank you.
-Chris
"You must be some sort of an engineer?" -Close Friend -
How to get the values in a single row without using union
Hi,
I have a table with the following structure and data
empid address phoneno emailid
1001 xyz
1001 1234234
1001 [email protected]
1002 23434
1002 [email protected]
1003 abcd
1003 [email protected]
1004 [email protected]
I need to have a result in this format.
emp id address phoneno emailid
1001 xyz 1234234 [email protected]
1002 23434 [email protected]
1003 abcd [email protected]
1004 [email protected]
I can do it using union however that gives a performance issues with a large table. So I wish to do using in any other way using lead or something, but with the complexity about the data, I couldn't do it.
Can anyone please help me?
Natarajan
Edited by: Nattu on Dec 3, 2009 3:50 PMSelect employee_id, max(address), max(phone), max(email)
from emp
group by employee_id;Max -
Need sql query to remove duplicates using UNION ALL clause
Hi,
I have a sql query which has UNION clause.But the UNION clause is causing some performance issues.
To overcome that I have used UNION ALL to improve performance but its returning duplicates.
Kindly anyone send a sample SQL query where my primary objective is used to use UNION ALL clause and to consider unique rows (elimating duplicate
ones)
Any help will be needful for me
Thanks and Regardswhy not UNION? :(
another way also use MINUS
SQL>
SQL> with t as
2 (
3 select 1 if from dual union all
4 select 2 if from dual union all
5 select 1 if from dual union all
6 select 3 if from dual union all
7 select 3 if from dual
8 )
9 ,t2 as
10 (
11 select 1 if from dual union all
12 select 2 if from dual union all
13 select 3 if from dual union all
14 select 4 if from dual union all
15 select 5 if from dual
16 )
17 (select if from t
18 union all
19 select if from t2)
20 /
IF
1
2
1
3
3
1
2
3
4
5
10 rows selected
SQL> so
SQL>
SQL> with t as
2 (
3 select 1 if from dual union all
4 select 2 if from dual union all
5 select 1 if from dual union all
6 select 3 if from dual union all
7 select 3 if from dual
8 )
9 ,t2 as
10 (
11 select 1 if from dual union all
12 select 2 if from dual union all
13 select 3 if from dual union all
14 select 4 if from dual union all
15 select 5 if from dual
16 )
17 (select if from t
18 union all
19 select if from t2)
20 minus
21 select -99 from dual
22 /
IF
1
2
3
4
5
SQL> -
I have these views using union
create or replace view V_CONSULTATION_SUMMARY
AS SELECT
Consul_date "DATE",
Consultation_No,
TO_NUMBER(NULL) "RECEIPT_NO",
Consultation_fee "CREDIT",
TO_NUMBER(NULL) "AMOUNT_PAID"
FROM consultation
union select
B.Receipt_Date "DATE",
A.Consultation_No,
B.Receipt_No "RECEIPT_NO",
TO_NUMBER(NULL) "CREDIT",
B.Amount_Paid "AMOUNT_PAID"
FROM consultation A, Receipt B WHERE
b.Consultation_No=A.Consultation_No
ORDER BY "DATE", Consultation_No, RECEIPT_NO;
create or replace view V_PATIENT_FINANCIAL_RECORDS
AS SELECT
A.PID,
B.*
FROM cONSULTATION A, V_CONSULTATION_SUMMARY B
WHERE A.Consultation_No=B.Consultation_No;
then I tried to access it from oracle forms using datablock wizard to access both views, and both of them failed. could some one tell me why. The error message is:
FRM-40505: ORACLE error: unable to perform query
thank'sWhy not?
but, you should try it next time ->
insert into <dest_table>
select BKNO,BKNAME,AUTHORNAME,PUBLISHER,PRICE,STATUS
from (
select BKNO,BKNAME,AUTHORNAME,PUBLISHER,PRICE,STATUS
from lib_bk_det
union
select BKNO,BKNAME,AUTHORNAME,PUBLISHER,PRICE,STATUS
from lib_bk_det_20
);N.b.: Not Tested...
Regards.
Satyaki de. -
How to use 'UNION' between two different databaseservers
Hello,
Could someone help me out. I am trying to find out if and how to use 'UNION' between two different databaseservers.
We have 2 different queries, each queries on a different database; one MySQL the other MSSQL.
Could someone tell me how to use 'UNION' between thes 2 queries?
Thanks in advance,
Samir BenallaHello
You may use openrowset statement, (OPENROWSET (Transact-SQL))., but before you use this, you must configure your server
sample:
SELECT a.*
FROM OPENROWSET('SQLNCLI', 'Server=Seattle1;Trusted_Connection=yes;',
'SELECT GroupName, Name, DepartmentID
FROM AdventureWorks2012.HumanResources.Department
ORDER BY GroupName, Name') AS a
UNION
SELECT GroupName, Name, DepartmentID
FROM AdventureWorks2012.HumanResources.Department
ORDER BY GroupName, Name
With this you can define a connection using native client to server Seattle1, and execute a query there, The results will be spooled on your server.
Connectionstring
Server=[SERVER_NAME];datasource=[YOUR DATABASE NAME];user_id=sa;password=sapassword'
if you use FQDN on your Query, than the datasource parameter in connection string can be letf out.
Regards
János.
take care of performance, it can be very slow, -
Adding new column in an existing report which was build using Union
While working in OBIEE 11g I encounter an issue.
My existing report was build using UNION at Criteria Tab in Analysis. Now I have a requirement to add a new column into the same report. For each criteria I have added the new column but when I go back to the "Result Columns". I see a new field added but it is not allowing me to open or edit column properties for that new column & at the same time it is not allowing me to navigate to other tabs like Results, Promts, and Advanced.
I don’t want to build this report from scratch. Is there any workaround to get it resolved?Hi,
Just check it once the new added column data types are mismatched or not?
and the new added column should be navigated into excluded section, so u should edit the report and dragged into the table column section.
Thanks.. -
Query takes long when using UNION
Hi ,
I habe a query as follows;
SELECT
'9999' site_id,
m.ghi_prov_num provnum,
SUBSTR (l.seq_num, 1, 3)provloc,
t.dea_number dea,
t.license_number statelicensenumber ,
n.npi_num npi,
m.prefix prefixname,
m.lastname lastname,
m.firstname firstname,
t.middle_name middleinitial,
m.suffix suffixname,
null clinicname,
l.street1 addressline1,
l.street2 addressline2,
l.city city,
l.state state,
l.zip5 zip,
l.phone phoneprimary,
null ext,
null fax,
null email,
null alt_phone,
null alt_phone_ext
FROM provider m, LOCATION l, npi n,TEMP_VITAL_CACTUS t,test_provider_pin pin
WHERE m.ghi_prov_num=l.ghi_prov_num
and m.ghi_prov_num=n.ghi_prov_num(+)
and m.ghi_prov_num=t.ghi_prov_num(+)
and m.tax_id=pin.tax_id
UNION
SELECT
'9999', m.ghi_prov_num ,
m.location provloc,
null ,
null ,
n.npi_num ,
null ,
m.lastname ,
m.firstname ,
null,
null ,
null ,
m.street1 ,
m.street2 ,
m.city ,
m.state ,
m.zip5 ,
m.phone ,
null ,
null ,
null ,
null ,
null
FROM dental_provider m, npi n,test_provider_pin pin
WHERE m.ghi_prov_num=n.tax_id(+)
and m.location=n.location(+)
and pin.tax_id=m.ghi_prov_num;The query takes for ever;
But Individual query takes less than a sec to execute.Is there any way can i rewrite the query?
Please help
Hena.user11253970 wrote:
But Individual query takes less than a sec to execute.Is there any way can i rewrite the query?Have a feeling you are using Toad/SQL Navigator or similar tool which returns data one screen at a time. If so, then it does not "takes less than a sec to execute" but rather to fetch first screen of rows. When you use UNION Oracle has to return distinct rows from both queries. Therefore it must fetch not just first screen but all rows. To verify, issue first query and in yiour GUI tool click on get last screen. Then you'll know how long whole select takes. Do the same for second query. Also, do you need distinct rows or akll rows? IF all rows, change UNION to UNION ALL.
SY. -
Best practice to monitor 10gR3 OSB performance using JMX API?
Hi guys,
I need some advice on the best practice to monitor 10gR3 OSB performance using JMX API.
Jus to show I have done my home work, I managed to get the JMX sample code from
http://download.oracle.com/docs/cd/E13159_01/osb/docs10gr3/jmx_monitoring/example.html#wp1109828
working.
The following is the list of options I am think about:
* Set up: I have a cluster of one 1 admin server with 2 managed servers, which managed server runs an instance of OSB
* What I try to achieve:
- use JMX API to collect OSB stats data periodically as in sample code above then save data as a record to a
database table
Options/ideas:
1. Simplest approach: Run the modified version of JMX sample on the Admin Server to save stats data to database
regularly. I can't see problems with this one ...
2. Use WLI to schedule the Task of collecting stats data regularly. May be overkill if option 1 above is good for production
3. Deploy a simple web app on Admin Server, say a simple servlet that displays a simple page to start/stop and configure
data collection interval for the timer
What approach would you experts recommend?
BTW, the caveats os using JMX in http://download.oracle.com/docs/cd/E13159_01/osb/docs10gr3/jmx_monitoring/concepts.html#wp1095673
says
Oracle strongly discourages using this API in a concurrent manner with more than one thread or process. This is because a reset performed in
one thread or process is not visible to another threads or processes. This caveat also applies to resets performed from the Monitoring Dashboard of
the Oracle Service Bus Console, as such resets are not visible to this API.
Under what scenario would I be breaking this rule? I am a little worried about its statement
discourages using this API in a concurrent manner with more than one thread or process
Thanks in advance,
SamHi Manoj,
Thanks for getting back. I am afraid configuring aggregation interval from Dashboard doesn't solve problem as I need to collect stats data of endpoint URI or in hourly or daily basis, then output to CSV files so line graphs can be drawn for chosen applications.
Just for those who may be interested. It's not possible to use SQL to query database tables to extract OSB stats for a specified time period, say 9am - 5pm. I raised a support case already and the response I got back is 'No'.
That means using JMX API will be the way to go :)
Has anyone actually done this kind of OSB stats report and care to give some pointers?
I am thinking of using 7 or 1 days as the aggregation interval set in Dashboard of OSB admin console then collects stats data using JMX(as described in previous link) hourly using WebLogic Server JMX Timer Service as described in
http://download.oracle.com/docs/cd/E12840_01/wls/docs103/jmxinst/timer.html instead of Java's Timer class.
Not sure if this is the best practice.
Thanks,
Regards,
Sam -
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You could download a trial and see how well it works before committing to a subscription. You get 30 days to decide.
Photo editor | Download free Adobe Photoshop CC trial
Photo editor app | Download free Adobe Photoshop Lightroom 5 trial
Gene -
How to use union statement with declare & set function?
Hi Experts,
i have small query about how to use union statement with declare & set function?
Example as below :
DECLARE @name AS date
Declare @name2 AS date
/* SELECT FROM [2013].[dbo].[OINV] T0 */
/* WHERE */
SET @name = /* T0.DocDate */ '[%1]'
SET @name2 = /* T0.DocDate */ '[%2]'
select '2013',t5.U_salmannm,t1.CardName,t2.sumapplied as CollectionAmount,t2.DcntSum ,t3.DocTotal as InvoiceTotal,
datediff(dd,t3.DocDate,t1.Docdate) as Days
from 2013.dbo.orct t1
inner join 2013.dbo.RCT2 t2 on t1.DocNum = t2.DocNum
left join 2013.dbo.oinv t3 on
t3.docentry = t2.baseAbs
inner join 2013.dbo.ocrd t4 on t1.Cardcode = t4.CardCode
inner join [2013].[dbo].[@CQ_RTSM] t5 on t4.U_BeatCode = t5.U_RoutCode
where t2.DcntSum <> 0.000000 and t3.DocDate between [%1] and [%2]
Union
/* SELECT FROM [2014].[dbo].[OINV] T0 */
/* WHERE */
SET @name = /* T0.DocDate */ '[%1]'
SET @name2 = /* T0.DocDate */ '[%2]'
select '2014',t5.U_salmannm,t1.CardName,t2.sumapplied as CollectionAmount,t2.DcntSum ,t3.DocTotal as InvoiceTotal,
datediff(dd,t3.DocDate,t1.Docdate) as Days
from 2014.dbo.orct t1
inner join 2014.dbo.RCT2 t2 on t1.DocNum = t2.DocNum
left join 2014.dbo.oinv t3 on
t3.docentry = t2.baseAbs
inner join 2014.dbo.ocrd t4 on t1.Cardcode = t4.CardCode
inner join [2014].[dbo].[@CQ_RTSM] t5 on t4.U_BeatCode = t5.U_RoutCode
where t2.DcntSum <> 0.000000 and t3.DocDate between [%1] and [%2]You have to create stored procedure in SQL only .
Like u must have create for Crystal .
You can execute procedure in query manager but you have to enter parameter manually..
example
Exec @Test '20140101' '20140501'
Every time user has to enter it manually in yyyymmdd format in case of date parameters.
Example
Create Proc [@Test]
as begin
DECLARE @name AS date
Declare @name2 AS date
/* SELECT FROM [2013].[dbo].[OINV] T0 */
/* WHERE */
select '2013',t5.U_salmannm,t1.CardName,t2.sumapplied as CollectionAmount,t2.DcntSum ,t3.DocTotal as InvoiceTotal,
datediff(dd,t3.DocDate,t1.Docdate) as Days
from 2013.dbo.orct t1
inner join 2013.dbo.RCT2 t2 on t1.DocNum = t2.DocNum
left join 2013.dbo.oinv t3 on
t3.docentry = t2.baseAbs
inner join 2013.dbo.ocrd t4 on t1.Cardcode = t4.CardCode
inner join [2013].[dbo].[@CQ_RTSM] t5 on t4.U_BeatCode = t5.U_RoutCode
where t2.DcntSum <> 0.000000 and t3.DocDate between @Name and @Name2
Union
/* SELECT FROM [2014].[dbo].[OINV] T0 */
/* WHERE */
select '2014',t5.U_salmannm,t1.CardName,t2.sumapplied as CollectionAmount,t2.DcntSum ,t3.DocTotal as InvoiceTotal,
datediff(dd,t3.DocDate,t1.Docdate) as Days
from 2014.dbo.orct t1
inner join 2014.dbo.RCT2 t2 on t1.DocNum = t2.DocNum
left join 2014.dbo.oinv t3 on
t3.docentry = t2.baseAbs
inner join 2014.dbo.ocrd t4 on t1.Cardcode = t4.CardCode
inner join [2014].[dbo].[@CQ_RTSM] t5 on t4.U_BeatCode = t5.U_RoutCode
where t2.DcntSum <> 0.000000 and t3.DocDate between
between @Name and @Name2
end -
Hi Gurus,
I have three tables. I want to join all tables using union in SQL statement. The query is returning all the records from both tables but i only require unique rows based on a specific column value. Here is my table structure -
TableA -
LIC_ID NUMBER(10) NOT NULL
LIC_NUMBER VARCHAR2(20)
COMMENCE_DATE DATE
EXPIRY_DATE DATE
TERM VARCHAR2(20)LIC_ID is the primary key in this table -
Sample data from TableA
LIC_ID LIC_NUMBER COMMENCE_DATE EXPIRY_DATE TERM
2 TR4323 12/04/2008 11/03/2010 2 Years
34 TR5432 23/07/2009 22/07/2010 1 Year
45 TR5321 24/06/2009 23/06/2010 1 Year
65 TR6666 23/07/2010 22/07/2011 1 Year
32 TR2423 30/05/2010 29/05/2011 1 YearTableB -
MAR_ID NUMBER(10) NOT NULL
LIC_ID NUMBER(10) NOT NULL
ZONE_NAME VARCHAR2(20)
DEPARTMENT VARCHAR2(20)
ACTIVITIES VARCHAR2(200)
COMMENTS VARCHAR2(200)MAR_ID is the primary key in this table and LIC_ID is the foreign key on TableA
Sample data from TableB -
MAR_ID LIC_ID ZONE_NAME DEPARTMENT ACTIVITIES COMMENTS
23 2 ZONE A IT NONE
43 34 ZONE B IT NONE
33 65 ZONE C ACCOUNT NONE
TableC
REC_ID NUMBER(10) NOT NULL
LIC_ID NUMBER(10) NOT NULL
DIST_NAME VARCHAR2(20)
REGION VARCHAR2(20)
ACTIVITIES VARCHAR2(200)
COMMENTS VARCHAR2(200)REC_ID is the primary key in this table and LIC_ID is the foreign key.
Sample data -
REC_ID LIC_ID DIST_NAME REGION ACTIVITIES COMMENTS
2 45 SA NORTH NONE
3 65 TA NORTH NONE
5 32 NT SOUTH NONEHere is my sql query -
select a.lic_id, a.lic_number, a.commence_date, a.expiry_date from
TableA a, TableB b
where a.lic_id=b.lic_id
union
select a.lic_id, a.lic_number, a.commence_date, a.expiry_date from
TableA a, TableC c
where a.lic_id=c.lic_idThe above query returns -
lic_id lic_number commence_date expiry_date
2 TR4323 12/04/2008 11/03/2010
34 TR5432 23/07/2009 22/07/2010
45 TR5321 24/06/2009 23/06/2010
65 TR6666 23/07/2010 22/07/2011
32 TR2423 30/05/2010 29/05/2011
65 TR6666 23/07/2010 22/07/2011 LIC_ID 65 exists in both table TableB and TableC hence it repeats in query but I want to display that only once. How can I do that? I want to return unique record on LIC_NUMBER.
Hope this make sence.
Many thanks,
TajuddinThanks for all your reply and suggestions. David altering session did not work.
Sven your idea helped me to figure it out what to do. I found a way around to fix it. Here is my current code -
select a.lic_id, a.lic_number, a.commence_date, a.expiry_date from
TableA a, TableB b
where a.lic_id=b.lic_id
union
select a.lic_id, a.lic_number, a.commence_date, a.expiry_date from
TableA a, TableC c
where a.lic_id=c.lic_id and c.lic_id not in ( select lic_id from TableB)This will exclude any LIC_ID exists in TableB.
Thanks again for your help guys.
Regards,
M Tajuddin
Web: http://tajuddin.whitepagesbd.com
Blog: http://aspblog.whitepagesbd.com -
Writing query using UNION Operator
Question -
(1)
Write an SQL Statement to list the following items: Customer ID, Customer Name, number of invoices, sum of total for invoices. Ensure that all customers are returned in the result set.
Answer for the above is written as below by one person. That seams to be correct. Is there another way of writing this same query.;
select c.CUSTOMER_ID,c.NAME,i.cnt,i.s
from gee_customer c,(select customer_id,count(*) as cnt, sum(TOTAL) as s
from gee_invoice
group by customer_id) i
where c.CUSTOMER_ID = i.customer_id (+)
(2)
My other question is How to write the above answer (or what you sugest) using UNION operator ?
Any ideas please
Message was edited by:
user483578In fact the outer join means you use the union of two result sets - usual join result
and the rows from the outer table for which there is not any row in the inner table.
SQL> select d.deptno, e.ename from emp e, dept d
2 where d.deptno = e.deptno(+)
3 order by 1,2
4 /
DEPTNO ENAME
10 CLARK
10 KING
10 MILLER
20 ADAMS
20 FORD
20 JONES
20 SCOTT
20 SMITH
30 ALLEN
30 BLAKE
30 JAMES
30 MARTIN
30 TURNER
30 WARD
40
15 rows selected.
SQL> select d.deptno,e.ename from emp e, dept d
2 where d.deptno = e.deptno
3 union
4 select deptno, null
5 from dept d where not exists (select null from emp e where e.deptno = d.deptno)
6 order by 1,2
7 /
DEPTNO ENAME
10 CLARK
10 KING
10 MILLER
20 ADAMS
20 FORD
20 JONES
20 SCOTT
20 SMITH
30 ALLEN
30 BLAKE
30 JAMES
30 MARTIN
30 TURNER
30 WARD
40
15 rows selected.In your example something like (NOT tested !)
with i as (select customer_id,count(*) as cnt, sum(TOTAL) as s
from gee_invoice group by customer_id)
select c.CUSTOMER_ID,c.NAME,i.cnt,i.s
from gee_customer c, i
where c.CUSTOMER_ID = i.customer_id
union
select c.CUSTOMER_ID,c.NAME,null,null
from gee_customer c
where not exists (select null from i where c.CUSTOMER_ID = i.customer_id)
Rgds. -
HI,
I want to select data from 2 tables using Union in Popup LOV ,
please help.
I am getting a error message like
"LOV query is invalid, a display and a return value are needed, the column names need to be different. If your query contains an in-line query, the first FROM clause in the SQL statement must not belong to the in-line query."
when i use union query
my query is like this
select a from table 1
union
select b from table 2
order by a;Hi,
Three things -
1) Remove the semi-colon from the end of your query (it can work without it, but you'll eventually run into problems some day by putting a semi-colon on the end, so better to get into the habit of not doing it).
2) You need to provide 2 columns in your query, a display value and a return value (look at the error message you are getting). You are only returning a single column.
3) Wrap your query inside another query to get it to work.
Something like this should work -
select * from (
select 1 as r, 2 as d from dual
union
select 3 as r, 4 as d from dual)
order by dObviously change the values/columns to suit your own purposes.
Hope this helps,
John.
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