Indexing Mapping And Junction Tables?
Aug 29, 2008
however im taking database size into account. i believe there has to be some sort of medium when it comes to infrastructure and performance.
this is specific to tables which map other tables. these tables that im creating usually consist of only 4 columns. 3 columns are mapped ids and the other a date in field. the 3 columns need to be indexed because they are used in joins within views. also those fields in the other tables are indexed as well.
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Jan 30, 2012
I have, for example, two tables: COMPANIES and EMPLOYEES. COMPANIES has a primary key on column COMP_ID. EMPLOYEES has a foreign key EMP_COMP_ID. I always do query COMPANIES with WHERE clause on COMP_ID and COMP_ADDRESS. What indexes on COMPANIES should I create in this case? First unique on COMP_ID, second composite on COMP_ID and COMP_ADDRESS? Or one unique index on COMP_ID and COMP_ADDRESS will be enough?
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Apr 12, 2013
what is the best practice to implement in Indexing,is it global indexing or local indexing, I would like implement one of them in object that has been partitioned horizontally.i dont know exactly what to make of it.
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Feb 28, 2011
I'm Using Oracle DB, I have got performance issue in one of my portlet, Can Re-Indexing work for Increasing the performance.
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Apr 28, 2013
Does Oracle supports an index that only contains a sub-set of the records in a table?
For eg - A table has 1 million records, can we have a index which contains suppose 100k records. We have used a similar logic in DMSII in Unisys. Not so sure if Oracle supports it.
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Apr 16, 2013
i want to ask about indexing in partition table. i have table that indexed by local index. when i want to select all data. I execute this query
select * from Book_Issue_Part where status='Pinjam';
but it does not select all data, only partly data have selected. is it a wrong query to select all data in indexing partition table? so what query should i execute to get all data.
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Jun 20, 2011
DB: Oracle 10g R2
OS: SUSE Linux SP 1 x864
We are maintaining a DR of our Database Server(oracle 10g R2 atop SUSE SP1 Linux) using Platespin(
[URL]......
Platespin is set to replicate(block based), incremental data(delta) every 1.5 hour from Production to DR site over a 30 Mbps dedicated fiber link.
Our maximum changes of data per day(during business hours) wont exceed 300 MB. During business hours Platespin replicates at least 1 GB at every replication cycle, while during off hours it replicates 300 to 500 MB per replication cycle. We are facing this strange issue with this box only(SLES 10 SP1 + Oracle 10g R2), we have protected MS Exchange 2007 Server based workloads without this strange issue, i.e in case of Exchange only delta replicates from Production server to DR site on Platespin.
Platespin support says us that Oracle re-indexes its database for better performance, so it is possible that re-indexing causes the blocks level changes on the storage, and since Platespin works on Block level, thats why it replicates so much(even though data is not changed that much)
here is actual words of Platespin support
<snip>
I think whenever Oracle database Indexing happens, it changes almost most of the Blocks of database and Platespin replicate all those Blocks.
As you know, Platespin checks the Date/Time attribute of every blocks before replication and if Date/Time attribute changes from last replication, it considers as changed block and replicate those blocks on Platespin Appliance. So, my suggestion is just look into the Oracle server behaviour before/after Data indexing process and do needful or do some workaround to overcome this issue.
</snip>
is there anything we can do at oracle level ?
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May 3, 2011
I have two databases called
a) Old Retailer database
b) New Retailer Database
We cant delete old database but we are using and we want to use both of them.
Now problem
Both dbs have a table called retailer.
I want to prevent duplication in them.
I.e it there is a retailer 12 created in old one new one shldnt allowo us to create retailer
id---12
similarly if there is a retailer 13 in new one it shouldnt be created in old table
retailer ids are unique. its not the case that with retailer id for example 5 there is a
different retailer in these two tables of diffferent DBS. Its unique
Now I have to put this criteria
how can i do it?
Second questions===================
if a primary key is auto increment. how can i skip some numbers lets say it is 1,2,3,4
i want that when next record shld be inserted it shld be 6 not 5. i dont want to feed the value 6. i want to know how to change indexing of primary key to skip some numbers when its set to auto increments.
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Apr 27, 2012
I have a OWB mapping which takes input from a staging table and add those row to the Cube. The underlying table behind cube is a relational fact table joined with the dimensions using foreign keys. Explain plan behind the query has a rather high cost and the mapping runs for 30 minutes. If you see below, in step 17, the cost goes up to 1,396,573 which is also where nested loops start to appear. Query plan is also attached in the image format.
Plan
SELECT STATEMENT ALL_ROWSCost: 1,746,526,275 Bytes: 386,835,904 Cardinality: 464,947
46 NESTED LOOPS OUTER Cost: 1,746,526,275 Bytes: 386,835,904 Cardinality: 464,947
41 NESTED LOOPS OUTER Cost: 1,744,200,663 Bytes: 380,791,593 Cardinality: 464,947
37 NESTED LOOPS OUTER Cost: 1,743,270,415 Bytes: 374,747,282 Cardinality: 464,947
34 NESTED LOOPS OUTER Cost: 1,740,476,128 Bytes: 368,702,971 Cardinality: 464,947
29 NESTED LOOPS OUTER Cost: 1,739,545,862 Bytes: 362,658,660 Cardinality: 464,947
25 NESTED LOOPS OUTER Cost: 1,710,193,475 Bytes: 356,614,349 Cardinality: 464,947
[code].........
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May 24, 2013
Using oracle forms 6i i want to carray out following task.
suppose i've table with following fields namely
loc_id, del_date, del_time, del_id
and i've excel sheet with following details
dateiddtimedid
---------------------------------------------------------------------
20-03-13 loc120:30:45RDT-01
25-03-13 loc215:25:30RTD-02
26-03-13 loc310:15:20RTD-03
want to import this excel data to my oracle table but l_id in my table is in first place but in excel sheet it is in second place, del_date in my table is in second place but in excel sheet it is in first place.
next time i may get excel sheet which will be like this
did lid date dtime
--------------------------------------------------------------------------------
DEL-01loc1 20-03-1320:30:45
DEL-03loc2 25-03-1315:25:30
This excel sheet also have different oreder than my database table and i want to import it to my database table using forms 6i. yes, i suppose to use ole2 package but my problem is how to map the columns.
I've already design a form i required i can attach it or provide screen shot of the same.
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May 25, 2013
I want to imopert excel data by coloumn mapping to oracle table using forms 6i". for this I've created a form which is having following details.
1. path, file name text field and button called browse. when the form load. click on browse botton, and user will be asked to go to specific drive and select the excel file. The file path is stored in path text field and file name is displayed on file name text field.
2. After doing this I've porvide a button called column. after selecting the file click on column button. Once the button is pressed all column heading of the selected excel file get displayed on the text fields which i've provide on the form.
3. In frot of each column headig field I've provide list box which contains database table column heading. Now user have to select table column according to his excel column. (i.e I am asking user to map his excel column with oracle table column.)
4. Once the maping from user is done, I've provide button called process. once the button is pressed all the data from excel is to get insert in to database colmum.
what i've achive -
- User is able to select file path and file name get displayed.
- Columns heding of excel get displayed on the form.
problem area
-In the process button code column heading get change dynamically but records i.e actual data does not.
-I am able to insert records into table, but only when excel column heading sequence is same as database table column.
excel column = table column
-----------------------------------------------------------------
route = route
date = del_date
time = del_time
id = tran_id
In above situation record get insert into table. But when only excel column sequence change that time data is not inserted into table. If required i can upload my form and sample excel sheet also provide table script.
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Feb 18, 2008
I have a problem with getting '|' sign in TOAD Editor. It is default for Croatian keyboard layout that I get '|' sign when I press Alt_gr+W key combination.
But in Toad, when I press Alt_gr+W combination Watches dialog is opened.I want to get '|' sign in Toad Editor when I press Alt_gr+W.
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Dec 2, 2010
I need to transfer PL/SQL or NESTED table from LOCAL database to REMOTE.I need to be able to use that transfered table in SELECT statement.I tried:
--ON LOCAL
SELECT SYS_OP_GUID() FROM DUAL;
--966D2DFEAEEB80D6E0430A0166CB80D6
create or replace type varchar_number_oid OID '966D2DFEAEEB80D6E0430A0166CB80D6' as object (
v varchar2(10),
i number);
/
Type created
SELECT SYS_OP_GUID() FROM DUAL;
--966D2DFEAEFB80D6E0430A0166CB80D6
[code]....
I tried using PL/SQL types it worked, but then i have a problem that i can not use local collection in SQL.
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Oct 30, 2012
I have a dumpfile from a database with hundreds of tablespaces. Do I need to remap all of them on impdp or is there a way to point all tables to a default tablespace? I mean, the source database has 200 tablespaces. The target database just 1.
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Dec 29, 2010
We are using Oracle 11gr2,centos linux.
In the OWB mapping,I needed to transfer data in lob table1 to lob table2 .Both tables are in 2 different schema.The table1 has blob and clob columns.The table 2 has same structure like table 1 and the table 2 is empty.
I have created the mapping and connected directly from the source table to the target table.Also , I have created a error table for the target table table. As for the data rule method,I customized the error table to log the non unique rows.
When I start validating the mapping . I got the following error
VLD-3200 Deduplicator cannot contain LOB type columns
How to log the error in error table for transferring lob type table1 to lob type table 2
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Jul 24, 2011
We have an application with many separate databases (one per customer). Given they share the same business requirements (service hours, change mgmt etc), we're interested in potentially consolidating the separate DBs (which are relatively small) into separate schemas within a fewer no of databases to reduce the overhead.
Our issue is that the application is hard-coded to use a specific administrator and application connection user name. Changing this is unfortunately not an option.
Given this limitation, is there any possibility to map a generic user into a customer-specific schema based on the database service that they connect to? Each customer connects to different database services but may use the same user name. We considered using private synonyms but this seems to acheive the opposite (i.e. many different users could connect and map to a single users schema). One thing to point out is that where there is a single user name, it is acceptable for a single password to be used across the different customer DBs as they will be a single admin/user.
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Feb 4, 2013
I have the following C code:
class Factorial {
public:
int getVal (int a);
};
[code]....
/When I am trying to execute this function always get the ORA-06521. I changed the data types - but nothing changed.
Just in case, listener.ora
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = db)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
[code]....
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Nov 15, 2010
Oracle version - 10.1.0.4 OS - HP-UX
In my alert log I am getting the following error quite repeatedly; My application hangs, and have to restart the instance.
CODEORA-00604: error occurred at recursive SQL level 1
ORA-06521: PL/SQL: Error mapping function
ORA-06512: at "SYS.OLAPIHISTORYRETENTION", line 1
ORA-06512: at line 6
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Nov 9, 2010
problem on oracle 11gR2 where i have to import data from a source database to an existing table without truncate or drop the target table in the target database.
we have found something called table_exist_action=append in impdp.
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May 18, 2011
I have to cleanup data from our tables (Production Environment) that contain millions of rows. The question is apart from the solution of the partitioned tables what alternative recommended solution suggests Oracle?
To delete these tables by using a cursor PL/SQL block or to import all the database and in the tables that we want to remove the old rows to use the QUERY option of the data pump utility.
I have used both ways and i have to admit that datapump solution is much much faster than the deletion that suffers from I/O disk.The question again is which method from these two is more reliable and less risky for the health of the database.
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Sep 3, 2012
I came across an implementation where data from DB2 tables are moved to Oracle tables, for BI solutioning, using some oracle procedures called from MS SQL DTS packages which are scheduled jobs.Just being curious, can this be done using OWB or ODI rather than the above detour. I suppose there are some changes being done in those procedures before the data is being loaded into Oracle tables, can't this be done using OWB/ODI? Can it be scheduled too as jobs using OWB/ODI?
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May 29, 2013
In our schema we have corresponding audit tables for most of the production tables
Ex Table name Audit Table
EMP EMP_AU
DEPT DEPT_AU
Audit tables will have all the columns of production table along with audit columns AUDIT_DATE , AUDIT_OPERATION There are few production tables which are not having audit tables.I need to write a script to identify
1) Production tables where corresponding audit table is missing
2) Where there is column difference (In case any column missing in audit table) between Production table and Audit table
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Sep 16, 2010
In Oracle database pl/sql 11.2: describe the differences between :
records,
tables, and
tables of records.
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Aug 25, 2011
I've got table tab1 with sequence id column.
Also I've got tables tab2 and tab3 with indicatorid column in each table.
My need is to prevent inserting values into indicatorid column in tables tab2 and tab3 which are absent in id column in table tab1.
For example, at this moment id column in table tab1 has two values, 1 and 2. I can insert value 3 into indicatorid column in tables tab2 and tab3. I need to prevent from inserting value 3 into indicatorid column in tables tab2 and tab3 while it is absent in id column of tab1 table.
How do I perform it?
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Jan 22, 2013
I have the Table name Location and synonym named Location in my DB. I am trying to create the proc where I am tryting to call the table. But its not working.
Example:
CREATE PROCEDURE TESTPROC
AS
BEGIN
DBMS_OUTPUT.PUT_LINE('testing');
select count(*) from LOCATION;
END;
Compile error:
Error(5,22): PL/SQL: ORA-00942: table or view does not exist
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May 19, 2011
can we link a table that contains a foreign key with a sequence table? i have a table that has a sequence bookid and i want to link this table to another table that contains a foreign key of bookid.can i link this two table and how?
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Aug 22, 2012
if the command is successful:>alter table my_table shrink;The segment will be defragmented and the High Water Mark will be moved.But what is the importance of the HWM?
Whats the difference between commands?
>alter table my_table shrink; -- move HWM
>alter table my_table shrink compact; -- not move HWV
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Nov 19, 2010
I have one table in a particular database and will have to create another table in a different database. I will have to join these two tables from two different DB's.
How should I go about doing this? Is this a good practice? or is it always better to use a single DB?
What are the disadvantages of joining two tables from two different DB's?
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Aug 29, 2013
Data migration for three tables. I have three table which are
1.npi_p_mig contain four fields (pr_id,mi_id,qty,sl_dt,fac_code)
2.np_detail(pr_id,mil_id,qty,sl_dt,facility)
3.np_ref_tab(facility,fac_code),
I need to migrated the data from based on two tables (np_detail,np_ref_tab) to new table npi_P_mig(pr_id,mi_id,qty,sl_dt,fac_code) table. i need sql script to migrate above two table to new table (npi_P_mig) .
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Feb 21, 2010
I'm trying to do a sum over 2 different tables but can't get it to work...This is the idea:I have a table A with client ID, time-id (per day), purchase amount and segment code.
In another table (let call it B) I have a lot of client ID's and also their purchase amount, time-id and segment code. I want to sum the purchase amount for every client from table A and B for clients with certain segment code from table B.
This is what I have now:
select client_id, purchase_amountA+ purchase_amountB from tableA, tableB where
A.client_id = B.client_id
and time_id between 20090101 and 20091001
and B.segment_code = 'A'
This does the job, but it selects only client_id's which are in both tables. I want to select all client_id from table B with segment_code 'A' and add the purchase_amount from table A to their purchase amount from table B, at least, if they have any purchase amount in table A.
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