Change Dataype in existing Table

Hi,
I need to change the dataype from
varchar2( 10 Byte) to varchar2( 15 char) of 10 columns . These 10 column are suppose to store data with special character.What would be the effect on existing data.
Thankyou
Shweta
Edited by: 984137 on Jan 25, 2013 3:55 AM
Edited by: 984137 on Jan 25, 2013 3:56 AM

SQL> desc test1;
Nombre                                    ┐Nulo?   Tipo
OBJECT_NAME                               NOT NULL VARCHAR2(30)
OBJECT_ID                                 NOT NULL VARCHAR2(20)
SQL> alter table test1 modify object_name char(50);
Tabla modificada.
SQL> desc test1;
Nombre                                    ┐Nulo?   Tipo
OBJECT_NAME                               NOT NULL CHAR(50)
OBJECT_ID                                 NOT NULL VARCHAR2(20)
SQL>

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Changes in the existing table structure

Dear All,
I have table called X and having some rows. I want to add another column with not null and add primary key. But I have to do care of existing data and database is in production?
Thanks

SQL> create table myt1 (x int not null);
Table created.
SQL> insert into myt1 values(1);
1 row created.
SQL> alter table myt1 add (y int);
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Name Null? Type
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Edited by: Robert Geier on Nov 12, 2009 10:33 AM

Best way to change partition key on existing table

Hi,
Using Oracle 11.20.3 on AIX.
We have a table about 800 million rows and 120gb in size.
Want to try copies oif this table to evalaute different partitiong strategies.
What is the quickest way to do this?
Would have liked say datapump table 1 tro disk and datapumo import the data to new table but do the tables need to be of the same format.
Thanks

>
Using Oracle 11.20.3 on AIX.
We have a table about 800 million rows and 120gb in size.
Want to try copies oif this table to evalaute different partitiong strategies.
What is the quickest way to do this?
Would have liked say datapump table 1 tro disk and datapumo import the data to new table but do the tables need to be of the same format.
>
First your subject asks a different question that the text you posted: Best way to change partition key on existing table. The answer to that question is YOU CAN'T. All data has to be moved to change the partition key since each partition/subpartition is in its own segment. You either create a new table or use DBMS_REDEFINITION to redefine the table online.
Why do you want to export all data to a file first? That just adds to the time and cost of doing the op.
What problem are you trying to use partitioning to solve? Performance? Data maintenance? For performance the appropriate partitioning key and whether to use subpartitions depends on the types of queries and the query predicates you typically use as well as the columns that may be suitable for partition keys.
For maintenance a common method is to partition on a date by year/month/day so you can more easily load new daily/weekly/monthly data into its own partition or drop old data that no longer needs to be kept online.
You should use a small subset of the data when testing your partitionings strategies.
Can you do the partitioning offline in an outage window? If not then using the DBMS_REDEFINITION is your only option.
Without knowing what you are trying to accomplish only general advice can be given. You even mentioned that you might want to use a different set of columns than the curren table has.
A standard heap table uses ONE segment for its data (ignoring possible LOB segments). A partitioned/subpartitioned table uses ONE segment for each partition/subpartition. This means that ALL data must be moved to partition the table (unless you are only creating one partition).
This means that every partitioning scheme that uses a different partition key requires ALL data to be moved again for that test.
Provide some information about what problem you are trying to solve.
>
Is this quicker than datapump?
>
Yes - exporting the data simplying moves it all an additional time. Ok to export if you need a backup before you start.
>
Found artcle which talks about using merge option on datapump import to convert partitioned table to non-partitioned table.
>
How would that apply to you? That isn't what you said you wanted to do.

Oracle partitioning - change in existing tables

I recently started working with legacy code and noticed that some huge tables (5 years worth of data, don't have more details on me right now but can post later if needed) are partitioned based on time sequence number column while majority of queries are done based on time (different column). Queries performance is degrading over time and I'd like to try to modify partitioning and run some tests to see if there is a performance improvement.
My only concern is this is a lot of data and they are all live, so I have to come up with some sort of solution on how to switch partitioning with the least impact on applications running 24 x 7.
Can someone suggest a viable solution? Something you have done in the same situation and it worked?
If there is a certain technique on how to do it, please give me search keywords and I will google the rest.
Thanks,
S.

You can't change the partitioning of an existing table.
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- Copying the data from the old table to the new table
- Dropping the old table
- Renaming the new table to the name used by the old table
Now, if the large table is only being queried, not updated (or at least you have a window where it is read-only), it's probably easier to just do these steps manually rather than using DBMS_REDEFINITION where you at least have finer grained control over the steps. You'll still need a moment where the table is inaccessible to do the actual rename.
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Hi,
My Oracle version is 10.2.0.4
Below is my structure of my test_table .
It has 1141580 rows.
I want to convert this into index Organized table. It has no secondary indexes.
How can I convert an existing table to IOT.
CREATE TABLE test_table (
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   Column3             VARCHAR2(100) NOT NULL,
   Column4             VARCHAR2(8)   NULL,
   Column5             VARCHAR2(40) NOT NULL,
   Column6             VARCHAR2(3)   NULL,
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USING INDEX
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alter table doesn't allow to change the organization of a table.
So the logical answer to your question is
You can not
and your question
redundant.
As most other questions here.
So the answer should have been
- create a new table
- insert all rows
- drop the old table
- rename the new table
Oracle is not about rocket science.
Oracle is about reading documentation and using brains.
If you do that, maybe, one day, you will be a bigboy.
If you keep asking redundant questions you will remain a littleboy.
Sybrand Bakker
Senior Oracle DBA

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How to add a new data element for existing table field(Primary key field)
For this filed ther is no foreign key relation ships and even check table.
while activating table it is giving message like below.
can you help any one to solve this and wil steps to add new dataelement for existing primary key filed of a table.
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Primary key change not permitted for value table /TC/VENDOR
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Hi,
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Hello expert,
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You will want to review information on replication and similar methods
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iv read the tutorial in this site http://www.w3schools.com/sql/sql_alter.asp but it is not for SQL Server 2000 DB.
Im using SQL Server 2000 DB. how do i insert column in an existing table?
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We are using FrameMaker 11 in a Windows 7 environment.
This is what happens.
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b. The heading row is shaded light blue.
c. The heading row has a medium border on top and bottom.
d. The heading row has text in is that is set to a Table Heading paragraph style.
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Thanks!
Edited by: stacyz on Jul 28, 2009 9:49 AM

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http://help.sap.com/saphelp_nw04/helpdata/en/cf/21eb47446011d189700000e8322d00/content.htm
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Rk
Message was edited by:
Rk Pasupuleti

Add column to user defined type based on existing table

Hello guys,
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create or replace
PACKAGE STAFF_AGENCY_PKG AS
TYPE TYPE_SEEKER_TABLE IS TABLE OF TOSS.SEEKER%ROWTYPE;
FUNCTION GET_SEEKERS(IN_KEYWORD IN VARCHAR2)
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create or replace
PACKAGE BODY STAFF_AGENCY_PKG
AS
FUNCTION GET_SEEKERS(IN_KEYWORD IN VARCHAR2)
RETURN TYPE_SEEKER_TABLE PIPELINED
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How do I need to amend my user type in order to suffice?
Oracle Release 11.2.0.1.0
Many thanks in advance!

>
How do I need to amend my user type in order to suffice?
>
You will need to create two new TYPEs. One that has all of the columns of the TOSS.SEEKER table and the new SCORE column and then a TYPE that is a table of the first type.
See the Example 12-22 Using a Pipelined Table Function For a Transformation in the PL/SQl language reference
http://docs.oracle.com/cd/B28359_01/appdev.111/b28370/tuning.htm#i53120
Here is the first part
-- Define the ref cursor types and function
CREATE OR REPLACE PACKAGE refcur_pkg IS
TYPE refcur_t IS REF CURSOR RETURN employees%ROWTYPE;
TYPE outrec_typ IS RECORD (
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FUNCTION f_trans(p refcur_t)
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END refcur_pkg;
CREATE OR REPLACE PACKAGE BODY refcur_pkg IS
FUNCTION f_trans(p refcur_t)
   RETURN outrecset PIPELINED IS
    out_rec outrec_typ;
    in_rec p%ROWTYPE;
BEGINModify
TYPE outrec_typ IS RECORD (
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Change Dataype in existing Table

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