How to tune query using dblink?

Hello,
I have query running on production DB(Version 9i).
The query is fetching data over the dblink.
Its taking around 14 minutes and total number of rows fetched are around 2 million.
Is there any way I can tune the query? I have used driving site hist but that didn't helped.

Ario wrote:
Hello,
I have query running on production DB(Version 9i).
The query is fetching data over the dblink.
Its taking around 14 minutes and total number of rows fetched are around 2 million.
Is there any way I can tune the query? I have used driving site hist but that didn't helped.
Do some math and tell us if there is a way you can tune this.
We have no idea what "2 million rows" means in terms of size. That could be 1GB of data, it could be 1PB of data. Figure out how much data you're trying to move (size wise), then figure out roughly how fast your network can pipe the data (again, we have no idea if you have a fiber line and this is an internal network between machines, or if you're transporting the data 1/2 way around the globe over a dial up connection).
When you have all that figured out you'll know if the 14 minutes is / or is not an acceptable amount of time.
Cheers,

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Source DB
SRC_Tab_A
C_ID     S_CODE     CODE     SEQ
21     005     005     5
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TGT_Tab_A
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21     005     005     5
21     006     006     6
21     007     007     7
21     008     008     8
21     009     009     9
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Hi,
How i can tune complex query?
what are the step to follow.

A very good one
http://www.dba-oracle.com/art_sql_tune.htm
Not particularly. At best it's a rambling collection of general principles where you have to work out which bits are right, out of date, or wrong. (Or - like the bit about Oracle 7 - so far out of date as to be a waste of space).
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<i>
For example, a simple query such as “What students received an A last semester?” can be written in three ways, as shown in below, each returning an identical result.
</i>
A nested query:
SELECT *
FROM STUDENT
WHERE
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A correlated subquery:
SELECT *
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        AND
        student_id = STUDENT.student_id
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Funnily enough, the most "intuitive" query - which is the one with an existence subquery - is not mentioned.
The OP would be far better off starting with the Performance Tuning Guide from http://tahiti.oracle.com
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
"The greatest enemy of knowledge is not ignorance,
it is the illusion of knowledge." Stephen Hawking.

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I tried the 3 version of the update, each of it taking around 30 minutes to update T1.
If I run the same sql immediately it completes within 5 minutes (execution plans are the same for both runs).
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id varchar2 (18) not null,
t_date date not null,
t_id varchar2 (18),
processed varchar2 (1) default 'N',
constraint T1_pk primary key ( id, t_date )
create index T1_prcsd on T1(processed);
create table T2
id varchar2 (18) not null,
t_id varchar2 (18) not null
create unique index customer_idx01 on customer(custnum);
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update T1 a
set t_id = ( select b.t_id
from T2 b
where a.id = b.id)
where id in ( select id from T2)
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*2:*
update T1 a
set t_id = ( select b.t_id
from T2 b
where a.id = b.id)
where exists ( select 1 from T2 c where a.id = c.id)
and processed = 'N';
*3:*
update ( select /*+ USE_NL(T1) INDEX( T2 T2_idx01 ) */
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How to tune the query and difference between CBO AND RBO.. Which is good

Hello Friends,
Here are some questions I have pls reply back with complete description and url if any ..
1)How Did you tune Query,
2)What approach you take to tune query? Do you use Hints?
3)Where did you tune the query and what are the issue with query?
4)What is difference between RBO and CBO? where u use RBO and CBO.
5)Give some information about hash join?
6) Using explain plan how do u know where the bottle neck in query .. how u will identify where the bottle neck is from explain plan .
thanks/Kumar

Hi,
kumar73 wrote:
Hello Friends,
Here are some questions I have pls reply back with complete description and url if any ..
1)How Did you tune Query, Use EXPLAIN PLAN to see exactly where it is spending its time, and address those areas.
See the forum FAQ
SQL and PL/SQL FAQ
"3. How to improve the performance of my query?"
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Even more helpful is writing the SQL efficiently (avoiding multiple scans of the same table, filtering early, using built-in rather than user-defined functions, ...), creating and using indexes, and, for large tables, partitioning.
Table design can have a big impact on performace.
Look for ways to do part of what you need before the query. This includes denormalizing (when appropriate), the kind of pre-digesting that often takes place in data warehouses, function-based indexes, and, starting in Oracle 11, virtual columns.
3)Where did you tune the query and what are the issue with query?Either this question is a vague summary of the entire thread, or I don't understand it. Can you re-phrase this part?
4)What is difference between RBO and CBO? where u use RBO and CBO.Basically, use RBO if you have Oracle 7 or earlier.

How to tune this query for the improve performance ?

Hi All,
How to tune this query for the improve performance ?
select a.claim_number,a.pay_cd,a.claim_occurrence_number,
case
when sum(case
when a.payment_status_cd ='0'
then a.payment_est_amt
else 0
end
)=0
then 0
else (sum(case
when a.payment_status_cd='0'and a.payment_est_amt > 0
then a.payment_est_amt
else 0
end)
- sum(case
when a.payment_status_cd<>'0'
then a.payment_amt
else 0
end))
end as estimate
from ins_claim_payment a
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and ( a.data_source = '25' or (a.data_source between '27' and '29'))
and substr(a.pay_cd,1,1) IN ('2','3','4','8','9')
group by a.claim_number, a.pay_cd, a.claim_occurrence_number
Thank you,
Mcka

Mcka
As well as EXPLAIN PLAN, let us know what proportion of rows are visited by this query. It may be that it is not using a full table scan when it should (or vice versa).
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Regards Nigel

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Using Oracle 10g (RAC Linux) to remote connect Windows 10g to dblink to AS/400 <
<I have created a procedure that I execute remotely by issuing the following:
CALL GLOBAL.REFRESH_STAGING@KRONOSLINK();
The procedure errors as
Error at line 2
ORA-20001: ERROR OCCURED
ORA-06512: at "GLOBAL.REFRESH_STAGING", line 47
ORA-06512: at line 1
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I unsuccessfully attempted to capture the error message.
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NOOBJECT EXCEPTION;
OBJECTEXIST EXCEPTION;
PRAGMA EXCEPTION_INIT(NOOBJECT, -00942); -- Exception handling for ORA-00942 - table or view does not exist
PRAGMA EXCEPTION_INIT(OBJECTEXIST, -00955); -- Exception handling for ORA-009555 - name is already used by an existing object
sT LONG := '';
sS LONG := '';
sST LONG := '';
cursor csrO is
SELECT
SCHEMANAME,
TABLENAME
FROM GLOBAL.STAGING_TABLES;
csrR csrO%ROWTYPE;
BEGIN
FOR csrR IN csrO
LOOP
sT := csrR.TABLENAME;
sS := csrR.SCHEMANAME;
sST := sS || '.' || sT;
BEGIN
EXECUTE IMMEDIATE 'drop table global.' || sT || ' purge';
EXCEPTION
WHEN NOOBJECT THEN
NULL;
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DBMS_OUTPUT.PUT_LINE(DBMS_UTILITY.FORMAT_CALL_STACK);
DBMS_OUTPUT.PUT_LINE(DBMS_UTILITY.FORMAT_ERROR_STACK);
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BEGIN
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COMMIT;
EXCEPTION
WHEN OBJECTEXIST THEN
NULL;
WHEN OTHERS THEN
DBMS_OUTPUT.PUT_LINE(DBMS_UTILITY.FORMAT_CALL_STACK);
DBMS_OUTPUT.PUT_LINE(DBMS_UTILITY.FORMAT_ERROR_STACK);
DBMS_OUTPUT.PUT_LINE(SQLCODE || ' - ' || SQLERRM);
RAISE_APPLICATION_ERROR (-20001, 'ERROR OCCURED');
END;
END LOOP;
END REFRESH_STAGING;
Thanks,
blevels

SET LINESIZE 500;
COLUMN DB_LINK FORMAT a20
COLUMN HOST FORMAT a20
COLUMN USERNAME FORMAT a20
COLUMN OWNER FORMAT a10
COLUMN TABLE_NAME FORMAT a20
select db_link,username, host from all_db_links where db_link = 'KRONOSLINK';
select privilege from dba_sys_privs where grantee = 'SYSTEM';
select owner, table_name from dba_tab_privs where grantee='SYSTEM';
DBLINK_ USERNAME HOST
KRONOSLINK SYSTEM ORCL
1 row selected.
PRIVILEGE
GLOBAL QUERY REWRITE
CREATE MATERIALIZED VIEW
CREATE TABLE
UNLIMITED TABLESPACE
SELECT ANY TABLE
5 rows selected.
OWNER TABLENAME_
SYS INCEXP
SYS INCEXP
SYS INCEXP
SYS INCEXP
SYS INCEXP
SYS INCEXP
SYS INCEXP
SYS INCEXP
SYS INCEXP
SYS INCEXP
SYS INCEXP
SYS INCVID
SYS INCVID
SYS INCVID
SYS INCVID
SYS INCVID
SYS INCVID
SYS INCVID
SYS INCVID
SYS INCVID
SYS INCVID
SYS INCVID
SYS INCFIL
SYS INCFIL
SYS INCFIL
SYS INCFIL
SYS INCFIL
SYS INCFIL
SYS INCFIL
SYS INCFIL
SYS INCFIL
SYS INCFIL
SYS INCFIL
SYS DBMS_ALERT
SYS DBMS_SYS_ERROR
SYS DBMS_RULE_EXIMP
SYS DBMS_AQ
SYS DBMS_AQADM
SYS DBMS_AQ_IMPORT_INTER
NAL
SYS DBMS_AQELM
SYS DBMS_TRANSFORM_EXIMP
SYS SYS_GROUP
SYS DBMS_DEFER_IMPORT_IN
TERNAL
SYS DBMS_REPCAT
WMSYS WM$UDTRIG_INFO
SYS SET_TABLESPACE
SYS CHECK_UPGRADE
SYS AVINASH
SYS AVINASH
SYS AVINASH1
SYS AVINASH1
SYS DB_PMP
SYS DB_PMP
SYS DIR_TESTCASE
SYS DIR_TESTCASE
SYS EXPORT_FULL_DIR
SYS EXPORT_FULL_DIR
SYS PUMP
SYS PUMP
SYS LOGS
SYS LOGS
SYS DPUMP_DIR2
SYS DPUMP_DIR2
SYS AVIS
SYS AVIS
SYS DPDIR_LCLLGS
SYS DPDIR_LCLLGS
67 rows selected.
Edited by: user10860953 on Jan 28, 2010 10:43 AM

How to tune the SQL & solve UNIQUE Contraint issue using without duplicates

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ROLL_SUB_ENT    VARCHAR2(3 BYTE)              NOT NULL,
ROLL_ENT_DESCR VARCHAR2(50 BYTE),
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SUB_ENT         VARCHAR2(3 BYTE)              NOT NULL,
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HIER_CODE     VARCHAR2(14 BYTE)               NOT NULL,
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CTR_DETAIL    VARCHAR2(14 BYTE)               NOT NULL,
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POST_ACCT         VARCHAR2(9 BYTE),
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EFF_DATE          DATE,
TXN_CODE          VARCHAR2(2 BYTE),
TXN_TYPE          VARCHAR2(1 BYTE),
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TXN_DESCR         VARCHAR2(46 BYTE),
TXN_SOURCE        VARCHAR2(1 BYTE)
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(ENT, SUB_ENT, POST_ACCT, POST_DATE, EFF_DATE,
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(ENT, SUB_ENT, CTR, POST_ACCT, POST_DATE,
EFF_DATE, TXN_AMOUNT);
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ORGANIZATION VARCHAR2(10 BYTE)               NOT NULL,
ACCOUNT       VARCHAR2(10 BYTE)               NOT NULL,
APPLICATION   VARCHAR2(10 BYTE)               NOT NULL,
AMOUNT        NUMBER(17,2)                    NOT NULL
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(ORGANIZATION, ACCOUNT, APPLICATION);
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    INSERT INTO REL_CLPR_TBOX_GL_TXN
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      SUBSTR(REL_CTR_HIER_REF.HIER_CODE, 1, 5) || '.....',
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                WHEN TXN.TXN_CODE IN ('02', '22') THEN -1
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          WHEN REL_COA_REF.ACCT_TYPE IN ('01', '25', '30', '40', '90', '95') THEN 1
                WHEN REL_COA_REF.ACCT_TYPE IN ('05', '10', '20', '35') THEN -1
                ELSE 0
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        INNER JOIN
      REL_CTR_HIER_REF
        ON
          REL_TXN.ENT = REL_CTR_HIER_REF.ENT AND
          REL_TXN.SUB_ENT = REL_CTR_HIER_REF.SUB_ENT AND
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          REL_CTR_HIER_REF.SUB_ENT = REL_ENT_REF.SUB_ENT
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[\CODE]
While try to run the query(only select statement), it is taking around 3+ hours & while try to insert the same query in the table, getting error called ORA-00001: unique constraint (INSIGHT.CLPR_TBOX_GL_TXN_IDX) violated.
[\CODE]
How to tune & resolve this UNIQUE Contraint issue using without duplicates?

Should the SELECT statement be returning duplicate rows? If you know that there are duplicate rows in the underlying tables, you could add a DISTINCT to the select. Which forces Oracle to do an extra sort which will slow down the insert. If you don't expect duplicate rows, you would need to figure out what join criteria is missing from your query and add that criteria.
Justin

How to tune the query...?

Hi all,
I am having a table with millions of records and the query is taking hours
time. How to tune the query apart from doing the following things.
1. Creating or Deleting indexes.
2. Using Bind variables.
3. Using Hints.
4. Updating the Statitics regurarly.
Actually, i have asked this question in interview how to tune the query.
I told him the above 4 things. Then he told, these are not working, then
how you will tune this query.
Thanks in advance,
Pal

user546710 wrote:
Actually, i have asked this question in interview how to tune the query.
I told him the above 4 things. Then he told, these are not working, then
how you will tune this query.It actually depends on the scenario/problem given.
You may want to read this first.
When your query takes too long ...
When your query takes too long ...
HOW TO: Post a SQL statement tuning request - template posting
HOW TO: Post a SQL statement tuning request - template posting

How can I access a database remote without using dblink, synonyms,aliases?

My store procedure access a remote tables using dblink, synonyms, alias, but by business company requirenments I nedd to use another data base access method. My PL/SQL statement looks like
select c.cus_id, c.cus_name, p.bankaccno
into v_cus_id, v_cus_name, v_bankaccno
from customer c, payment@finantial p
where c.cus_id = p.cus_id
Are any method else to connect to several remote databases concurrently?
If Yes, plase say me how is it, or tell me where do I obtain some examples, or any documentation.
Edited by: user518321 on Apr 21, 2009 1:58 PM
Ok, But I must not use any of these data base access method, metioned: dbliks, aliases, synonyms.
Edited by: user518321 on Apr 21, 2009 2:05 PM
Ok, It is enough for now, I am surprised for the response time and for their arguments, thanks a lot.
Edited by: user518321 on Apr 21, 2009 2:50 PM

If you want to access a table in a remote database using SQL, you will need a database link. It would be exceptionally odd for the business to require that you access a remote database and to prohibit the use of database links. What is the business reason for that combination?
If you want to look into rather more esoteric solutions, you could load a JDBC driver for the remote database, write a Java stored procedure that queries the remote table using that JDBC driver, and then cobble together some PL/SQL that joins the two result sets. You won't be able to reference the remote table in SQL and the solution won't scale well as data volumes increase and you'll be writing a whole lot of code to manually join tables together, but it does avoid database links. Of course, whatever concerns lead to the ban on database links would probably apply to loading a JDBC driver into the database and writing Java stored procedures to access the remote database, but since you haven't explained the reasoning behind the restrictions, we're just guessing.
Justin

How can I query all the members of a group using querbuilder? I cannot find any related properties

How can I query all the members of a group using querbuilder? I cannot find any related properties describing members under /home/groups/s/sample_group in jcr repository.

Hi,
FieldPoint Explorer is no longer used to configure FieldPoint systems. However, I do not think that the configuring your system in FieldPoint Explorer is causing the error.
FieldPoint systems are now setup in Measurement and Automation Explorer (MAX). Information on setting up FieldPoint systems in MAX can be found in the MAX help under: Installed Products>> FieldPoint. Also, I recommend upgrading to the latest FieldPoint driver and version of MAX. The FieldPoint VI's will be slightly different when you upgrade, so there is a good chance that this will eliminate the error.
Regards,
Hal L.

In DBI , how to find out the Source Query used for the Report

Hi All,
How to find out the Source Query used to display the data in the DBI Reports or Dashboards. We can get it in Apps Front end by Going to Help and Record Histroty. But DBI Runs in Internet Explorer so i dont know how to get the source query ( SELECT Query ) Used.
In IE we have View --> Source . But that does not help since it gives the HTML Coding and not the SELECT Query used.
If anyone has ever worked on it...Please help me in finding it.
Thanks,
Neeraj Shrivastava

Hi neeraj,
You can see the query used to display reports.Follow these steps to get the query.
1)Login to oracle apps
2)Select "Daily Business Intelligence Administrator" responsiblity.
3)Now click on "Enable/Disable Debugging" (Now u enabled debugging)
4)now open the report which you want to see the query of
5)In view source it displays query along with the bind varilables.
Feel free to ping me if you have any doubts
thanks
kittu

How to tune query using dblink?

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