How to retrieve first hundred records from a table ?
FYI
---
The table size is 5 GB
The table count is 127922653
Table has 14 columns
Table is partitioned as well.
The table has 10 partitions.
The requirement details are as below,
1) The database contains static as well as transactional data for telecom domain.
2) We have to move region-wise data from one database to another.
3) There are around 10 regions.
4) The region wise data extraction from source db is based on around 40 to 50 tables. Rest of the tables contains static data & it will not change.
5) The volume is around 1 million subscribers per region.
6) The migration is required because
a) The client is upgrading its base product which uses this database
b) There is a change in structure of static tables
c) Hardware upgrade
d) The client want to start with single region on new database & rest of the regions will be operated from old database.
7) Keep execution time to very minimum.
I am thinking to have solution as below,
1) Create destination database with upgraded db structure (as mentioned in 6b)
2) Create database links to access source db in destination db.
3) Write SQL queries to fetch data from all the respective tables for a specific region
4) Write separate PL/SQL blocks for each table to fetch data from source db & insert into respective table in destination db
a) Use FOR ALL & bulk collect to improve the performance
b) Divide table data into multiple chunks & execute parallel batches (around 10) to insert the data
5) Validate pre & post counts to verify the success of migration
I am exporting using query parameter. I am trying to export subset of table using rowid.
SQL> select rowid , name from tab1;
ROWID NAME
------------------ ---------------
AAAM0rAAEAAAAGMAAA sam
AAAM0rAAEAAAAGMAAB sona
AAAM0rAAEAAAAGMAAC rose
AAAM0rAAEAAAAGMAAD chris
AAAM0rAAEAAAAGMAAE san
.................. ....
.................. ....
command given as
exp sam/sam tables=tab1 file=exprwid.dmp query="where ROWID='AAAM0rAAEAAAAGMAAA'" log=log1.log
Export done in US7ASCII character set and AL16UTF16 NCHAR character set
server uses WE8ISO8859P1 character set (possible charset conversion)
About to export specified tables via Conventional Path ...
. . exporting table TAB1
EXP-00056: ORACLE error 911 encountered
ORA-00911: invalid character
Export terminated successfully with warnings.
how can i export this record ?
I am writing a SQL inside an application to retrieve data from a table for certain IDs or for All employees based on the user's input. I create a variable :SELECTION for the where clause. When I run the SQL, I receive the error of missing right parenthesis. There is no error if I hard code the IDs.
If the input is 'All' -> the variable :SELECTION is blank so if the SQL :
select name, address, ID from employee :SELECTION
will be
select name, address, ID from employee
If the input of users ID as '1234','9999' - > the :SELECTION = ' where ID in (:VARIABLEID)'
:VARIABLEID = '1234','9999'
so the SQL:
select name, address, ID from employee :SELECTION
should be
select name, address, ID from employee where ID in ('1234','9999')
However, I got the missing right parenthesis error. I suspect it is something with the single quote, so I tried different ways, but it is still not working.
Look into the below table:
TABLE :- EMPLOYEE
________________________
| ID | SUPERVISOR |
|_______________________|
| A101 | B102 |
|________|______________|
| | |
| B102 | C104 |
|________|______________|
| | |
| C104 | D108 |
|________|______________|
| | |
| D108 | E104 |
|________|______________|
Here B102 is supervisor of A101 and C104 is supervisor of B102 and so on. I want to get this data into new table in below format
TABLE :- Hierarchy
________________________________________________________________
| ID |SUPERVISOR_1 |SUPERVISOR_2 |SUPERVISOR_3 |SUPERVISOR_4|
|______________________|_____________|_____________|____________|
| A101 | B102 | C104 | D108 | E104 |
|________|_____________|_____________|_____________|____________|
| | | | | |
| B102 | C104 | D108 | E104 | NULL |
|________|_____________|_____________|_____________|____________|
| | | | | |
| C104 | D108 | E104 | NULL | NULL |
|________|_____________|_____________|_____________|____________|
| | | | | |
| D108 | E104 | NULL | NULL | NULL |
|________|_____________|_____________|_____________|____________|
| | |
| E104 | NULL | NULL NULL NULL
|________|_____________|_____________|_____________|____________|
I want to insert 1st two rows into Hierarchy table, then I would like to update Supervisor_2 to Supervisor_4. Here I don't want to use 'CONNECT BY PRIOR', as it take more time to execute (there are millions of records).SQL code for same.
I have the following table with the some sample data:
|| Filename || receiving_site || originating_site ||
| fileA | siteA | HQ |
| fileA | siteA | siteA |
| fileB | siteA | HQ |
| fileA | siteB | HQ |
| fileA | siteB | siteB |
| fileB | siteB | HQ |
| fileB | siteB | siteB |
The table works in such way:
1. For each of the Filename, if originating_site is not the same as receiving_site, it means that the file has been sent to receiving_site but has not been acknowledged received yet.
2. For each of the Filename, if originating_site is the same as receiving_site, it means the file has been sent and received by the receiving_site.
My task is to list out all the Filename per receiving_site that has been sent, but not received yet by the receiving_site. For example from the sample data above, I am expecting to see that siteA, fileB has not been received yet.
How can I do that? I had tried MINUS and NOT EXISTS command, but I am just not able to get the result that I want.
I have a "select ... into" in my PL/SQL and it doesn't retreive any data(I suppose just certain columns because if it doesn't retreive a row then the PL/SQL should throw an error) when there are many users accessing this table. It shouldn't be some table locking right? Because if it is, it should wait until the table is available then it will retreive data. Currently it just proceeds with the PL/SQL and selecting nothing in that query. what details should I look at to trace the cause of this problem.
View 4 Replies View RelatedI am using oracle 11g database.
unforunatly i delete the data from main table. and i operated alter stmt.
now how do i retrieve the data..??
I use the oracle 10g database.I am trying to insert and retrive the image.Inserting an image is done.but while retrieving an image iam getting an run time exception in java "java.sql.sqlexception:general error".i am not able to understand this.
The code to insert the image is
FileInputStream fi=new FileInputStream(f);
int size = fi.available();
System.out.println("j"+size);
byte b1[] = new byte[size];
i=fi.read(b1,0,size);
System.out.println("i"+i);
st.executeUpdate("insert into image1 values('b1',"+k+")");
when i am retrieving the image i tried like this
ResultSet rs=st.executeQuery("select imagecolumn from tablename");
here iam getting an exception as i named above.
I wanna have a form which has a list box which is including of all table names, by selecting the required table by user all column name and its related data should be retrieve.I have a cursor which give me all field names related to the table by I do not know how can I retrieve table data:
1. How to add item through block base on number of column which selected table has.
2. How to set value of table column in these mentioned column which added in the block.
3. And at the end retrieve the table data.
How similar is PL/SQL to SQL? I'm trying to retrieve all data from a customer table and print out each customer information one by one:
DECLARE
CURSOR all_customer IS
SELECT *
FROM customer;
BEGIN
DBMS_OUTPUT.PUT_LINE(all_customer);
END;
but I really don't know the correct syntax. The Powerpoint slides the professor gave is not useful at all.
i want to retrieve records of empno from SCOTT.EMP talbe in form but without data block wizard using ..how .. and what logic will be in coding
DECLARE
TYPE EROC IS TABLE OF VARCHAR2(200) INDEX BY BINARY_INTEGER;
E1 EROC;
NO_EMPNOVARCHAR2(2000);
[code]....
just caling here EMPNO and :v_empno is fields on form...
base on performance it is better to retrieve data from view or mention the table names directly?
I have a select statement in from clause one of my table is view (which is having data collected from four tables) my question is whether performance of querry will be improved if i use directly all tables( four tables of a view) instead of a view
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.
I have following records in table (T)
Idtype_cdNbrDt
1A1001/1/2013
2A101Null
3B100Null
4C100Null
5A100Null
Based on the type-cd, I need to create Unique index on Nbr & Dt columns
In above record set, I want to create Unique index on type_cd=A and not on B&C (Here i expect duplictes for a combination of Nbr & Dt)
Can we create Unique index on subset of record?
SELECT mkct_group_code FROM ID_MKT_CONTTYPE_GROUP_MASTER where mkct_group_code=20'
Note mkct_group_code column is varchar2(10) type.
It has values as
20
10
30
20'
30'
I am interested about the fast way to access all data in physical block. what is the quick way to bring data blocks using the rowid, I found this script but soon as I can have faster access:
select * from table_name t
WHERE ROWID between 'AAAUaOAAEAAHkJiAAA' and 'AAAUaOAAEAAHkJiAA8';
where 'AAAUaOAAEAAHkJiAAA' is the last element in the block and 'AAAUaOAAEAAHkJiAA8' is the first one
my question is can retrieve all the data in one block more quick than this query.
IF I have Salary Table,In that Salary Table,How to retrieve 6 decimal place of data .
View 16 Replies View RelatedI have one table as shown below,
CREATE TABLE MAT
(matrl varchar2(100),
date_man date,
weight number(10)
);
INSERT INTO MAT(Matrl,DATE_MAN,WEIGHT) VALUES ('mat1','12-DEC-10',100);
INSERT INTO MAT(Matrl,DATE_MAN,WEIGHT) VALUES ('mat2','13-DEC-10',200);
INSERT INTO MAT(Matrl,DATE_MAN,WEIGHT) VALUES ('mat3','21-DEC-10',300);
INSERT INTO MAT(Matrl,DATE_MAN,WEIGHT) VALUES ('mat4','26-DEC-10',400);
INSERT INTO MAT(Matrl,DATE_MAN,WEIGHT) VALUES ('mat5','22-DEC-10',500);
INSERT INTO MAT(Matrl,DATE_MAN,WEIGHT) VALUES ('mat6','02-DEC-10',600);
INSERT INTO MAT(Matrl,DATE_MAN,WEIGHT) VALUES ('mat7','23-DEC-10',700);
INSERT INTO MAT(Matrl,DATE_MAN,WEIGHT) VALUES ('mat8','07-DEC-10',800);
The data will look like this .
matrldate_manWeight
mat112-Dec-10100
mat213-Dec-10200
mat321-Dec-10300
mat426-Dec-10400
mat522-Dec-10500
mat602-Dec-10600
mat723-Dec-10700
mat807-Dec-10800
I need to order by this data in terms of date and need to get the data as shown below. Acc_wt is accumulated weight till the material.
Date Weightacc_wt
mat602-Dec-106000
mat807-Dec-10800600
mat112-Dec-101001400
mat213-Dec-102001500
mat321-Dec-103001700
mat522-Dec-105002000
mat723-Dec-107002500
mat426-Dec-104003200
Can we make use of oracle lag and lead functions here?Or some other methods?
example for retrieve data from blob column using pl sql procedure in oracle?
View 2 Replies View RelatedI am using LOV on some field to retrieve data, but sometimes it does not retrieve anything cause of unavailability of date its fine but i want to put N/A in that field when such condition is occurring .
View 2 Replies View RelatedI have a table created as below
create table tab123( x clob);
Inserted a row as below
insert into t values ('"<ProcessBatchRequest xmlns:inp1="http://services.abc.com/" ServiceVersionNumber="" xmlns="http://services.abc.com/GlobalBatchServiceV1.0">
<inp1:BatchDetail>
<inp1:ApplicationID>test.123</inp1:ApplicationID>
<inp1:ApplicationBatchID>test.123</inp1:ApplicationBatchID>
<inp1:MessageTimeStamp>2012-11-28T11:05:32.000-05:00</inp1:MessageTimeStamp>
[code]....
Now i want to retrieve the value present under a given xpath.
I have googled so much but unable to find the explanation how the following query work.
SELECT * FROM EMP a WHERE 2 = (SELECT COUNT(rowid) FROM EMP b WHERE b.rowid <= a.rowid);
I have a table
select * from testing
Quote:
ID NAME REDATA
-------------------- -------------------- --------------------
1 ABC,DEF,GHI,LKJ 000001
2 MNC,GHI,CTF 000002
2 rows selected
select * from testing where name like ('GHI,TCF');
now my output should be as above because GHI is common in both the names.if any of the where condition string matches the Name field then I need that record to be retrieved.
,i have a table called travel detail from which i have retrieved few rows based on 1 condition by using LOV and on next few rows modification is allowed. The rows are getting modified but it is also allowing me to enter in next blank row and insert any data in that row.how can i retrieve only that data which is based on the given condition. Further blank rows should not b displayed.
View 2 Replies View RelatedI'm trying to retrieve data with multiple select statements. The query works fine for 1 account (segment6) but fails for more than account. Below is the query.
select PERIOD_NAME "Month/Year",segment1 "Company" ,Segment6 "GL Account", currency_code "Currency",Mmt "Movement",
BEGIN_BALANCE+PERIOD_DR-PERIOD_CR "Balance At Date"
FROM
(select gb.period_name "PERIOD_NAME",decode (gcc.segment1, '20', 'Internode', '10', 'Agile') SEGMENT1,
gcc.segment6 "SEGMENT6", gb.currency_code "CURRENCY_CODE", gb.begin_balance_dr "BBDR", gb.begin_balance_cr "BBCR",
[code].....
I have a detailed block with a user ID column. The user name is not available in the block. Therefore, I have created a non-database column to retrieve the user name into it.
Here is the code I've used.
PROCEDURE get_details IS
iLoop number := 1;
CURSOR c is
SELECT FULL_NAME
FROM GRP_EMPLOYEE
WHERE EMPLOYEE_NUMBER = :USER_ID;
[Code]...
However, it retrieves the first record only.
The results are displayed like this.
Loop: Result:
1 Full_Name
2 Empty
3 Empty
4 Empty
I have a table name as angdata77 having attributes like asigno..i want to retrieve data from angdata77 by using both group by & order by clauses.. for total count..am using the query as
select asigno,count(*) from angdata77 group by asigno order by asigno;
Is there any other query for retrieving the data from angdata77
i have a column that contains 1 to 100 values but it has some missed data such as it does not has 50,45,34,23 etc..
so how could i find the missed data alone in a single query..
how to connect to Oracle to retrieve data using SQL language. I've started with a new company which is pretty much a sink or swim type of environment meaning you're an idiot if you don't figure it out on your own. I was told that we use Toad for Oracle 10g. I was given a server name; location and an .ora file named tnsnames that was given to me but I have no clue what to do with. I've come from companies where this was already setup. You just go into access to retrieve the data.
II have totally hit a brick wall with all the other roadblocks I encounter and all researched out. Where I can get step by step instructions on how to connect to start sql in Toad/Oracle?