Partitioning an Existing Table using DBMS_REDEFINITION with no primary key?

HI,
Is it possible to partiiton a table with dbms_redefination if the table contains no primary key?
DB version 10.2
Thank you All..

Yes, of course, but you'll have to use rowID with "CONS_USE_ROWID" : http://68.142.116.68/docs/cd/B19306_01/appdev.102/b14258/d_redefi.htm#CBBFDJBC
This will be longer but it is possible.

Similar Messages

How do you insert new records into multiple tables using the same unique primary key?

I’ve created a PHP site and MySQL server using a free app called XAMPP. I have successfully created a form in Dreamweaver that will write data to a (name) table in the SQL database. Here’s my question: How do you write to two (or more) tables in the same database and pass the same primary key to both tables? In the SQL database, I defined the first field as ID and set it as the primary key with auto update. So, when you insert a new record, it creates a unique primary key for that record. In my form, I’m capturing info that needs to be stored to two tables at the same time; a Name table and Address table. Since the Name and Address tables use the ID field as the primary key, I believe I will need to pass the ID value from the Name table to the insert of the Address table to insure they both have the same primary key, right?

No. You probably need the primary key from one table to be a foreign key in the other tables. In any case, I believe you can use two methods to obtain the auto generated key. First with SQL:
http://dev.mysql.com/doc/refman/5.0/en/getting-unique-id.html
And the other using a PHP function:
http://us3.php.net/mysql_insert_id

Partitioning an Existing Table with data

Hi All,
I am few tables with data, I need to Partition the table without affecting existing table values is it possible?.
if yes then Please suggest me some ideas to archive that..
Thanks & Regards
Sami

Hi All,
I Need to partition for existing table with 1 million records
1. First partition should be created for 6 months
2.Second partition should created for 1 year.
3.So as of now we have 6 months Data in production + another 6 months data in First partition + another 1 year data in Second partition.
4.More than 2 year’s data’s should be moved other partition or archived.
kindly provide your valuabe suggestion.
Thanks & Regards
Sami

How to create a partition on existing table?

Hey
Could some one please tell me on how to create a partition on existing table?

Could some one please tell me on how to create a partition on existing table?
You can't - that isn't possible. Unless a table is already partitioned you can NOT create another partition on it.
You must either redefine the table as a partitioned table (using the DBMS_REDEFINITION package) or create a new partitioned table and move the data to its new partitions.
The choice will depend on how much data the existing table has and whether you can do it offline.

What's the best practice to partition an existing table?

We are using Oracle 11g EE 11.2.0.3.0. We want to partition an existing table. I found some information from this link [http://www.oracle-base.com/articles/misc/partitioning-an-existing-table.php], but I am not sure whether that's the best way. Could anyone share the best practice of partitioning an existing table?
Thanks.
Jun

>
We want to partition a few related tables. A couple of tables have about 30 million rows, and a couple of other tables have about 10 million rows. The data for those tables is for ~2000 accounts, each of them is identified by a column named "account_id". We want to partition the tables by using the "account_id" as the partition key to gain better performance for queries, so we would probably use hash partition. Please advise.
>
1. What evidence do you have that your performance will be any better if you partition those tables?
2. What evidence do you have that there is anything wrong with the performance of your current queries?
3. Have you reviewed the actual execution plans for your most important queries to see if there is even any room for improvement?
If your query uses account_id as a predicate but only pulls a few records from a 'master' table for that key value your performance may actually be worse if you partition that table. That is because using an index range scan Oracle can easily find the ROWIDs of the rows that need to be selected and then easily retrieve them regardless of their physical location.
If you have queries that do NOT use account_id but currently use indexes the performance of those queries may also be worse if you partition that table. Those indexes will be GLOBAL.
There are two major implications when you use hash partitioning:
1. Any query that does NOT include the partitioning key (account_id for your case) will, of necessity, have to use a full table scan if an appropriate index is not available.
2. You will get NO management benefits such as being able to add/remove partitions that include old data.
Before you decide to partition a table you should conduct tests and examine the execution plans for your important queries.

Partition an existing table

How can I partition an existing table? What's the SQL syntax?
Thanks for help,
Chen Zhao

Does anybody know how to partition an existing table?
YES! That is the simple answer to your question. There are a lot of people that know how to do that.
Whether partitioning is appropriate and, if so, which method might be 'best' for YOU depends on the particulars of your use case. But as with most problems you need to make sure you troubleshoot whatever issue you have in the proper order:
1. Identify a PROBLEM or issue that needs to be resolved - you haven't told us anything. Please post info about this
2. Validate that the problem/issue actually exists (it could just be a fluke occurence)
3. Identify potential solutions to the problem/issue - that list of solutions may, or may not, include partitioning
4. Select a small number (e.g. 1 or 2) of those solutions for further analysis and actual tests.
5. Select the 'best' (based on your orgs criteria) of those tested solutions for implemention
You seem to already be on step #5. But in order for us to help you we have to understand what the results of steps 1 thru 4 are.
Please post the information about your PROBLEM that we need to help you.

Partitioning an Existing Table

Dear Forum,
Can we create partition on an existing table without dropping it in Oracle 11.2.0.3.0?
I know EXCHANGE PARTITION, but that I don't want.
Thank you & regards.

You cannot partition an existing table.
You have to create a new partitioned table and move the data from the old table to the new table. If you want to do this online, you can potentially leverage the DBMS_REDEFINITION package to help you out. Behind the scenes, you're still creating a new table and, eventually, dropping the old table after moving all the data over. DBMS_REDEFINITION hides some of that from you and lets the table remain online while you are moving the data. But it adds some performance overhead.
Justin

Create partition to existing table

I have a existing table which is not partitioned. How can partition my existing table?

oops.... This is more better....
Partitioning an Existing Table
http://www.oracle-base.com/articles/misc/PartitioningAnExistingTable.php
Other method
(1) create new_table with oen or more range partition.
(2) alter table new_table exchange partition with old_table.
(3) rename or drop old_table.
(4) rename new_table to old_table.
(5) split or add partition.
-- Examples
--(1)
create table part_tab
partition by range (col)
(partition p1 values less than (maxvalue))
as select * from org_tab where 1=0;
--(2)
alter table part_tab
exchange partition p1 with table org_tab
without validation
--(3)
rename org_tab to backup_table;
--(4)
rename part_tab to org_tab;
--(5)
alter table org_tab
split partition p1 at (100)
into (partition p1, partition p2);
alter table org_tab
split partition p2 at (200)
into (partition p2, partition p3);
-- Results
SQL> select * from org_tab partition(p1);
COL        VC
99         abc
SQL> c/p1/p2
1* select * from org_tab partition(p2)
SQL> /
COL        VC
199        def
Original is written in Japanese language (OTN Japan)
http://otn.oracle.co.jp/forum/message.jspa?messageID=3045618?
Message was edited by:
ushitaki

How to restore a table using RMAN with previous backup ?

Hi everyone,
we have to restore a table from 1 week previous backup using RMAN.
Could you show me how to restore a table using RMAN with previous full backup.
please Help me out.
Thanks
Info > oracle 10g, OS: AIX5L

Hi,
first of all you must have all the archivelogs since you want to recover your table from the previous backups.
anyways if you want to recover your table then you need to perform incomplete recovery to the point where you loss the table for that you need to restore and recover your database.you likely to loose all the transcation which occurs to the point where you you loose your table.
thanks..

Suggestions for table partition for existing tables.

I have a table as below. This table contains huge data. This table has so many child tables .I am planning to do a 'Reference Partitioning' for the same.
create table PROMOTION_DTL
PROMO_ID              NUMBER(10) not null,
EVENT                 VARCHAR2(6),
PROMO_START_DATE      TIMESTAMP(6),
PROMO_END_DATE        TIMESTAMP(6),
PROMO_COST_START_DATE TIMESTAMP(6),
EVENT_CUT_OFF_DATE    TIMESTAMP(6),
REMARKS               VARCHAR2(75),
CREATE_BY             VARCHAR2(50),
CREATE_DATE           TIMESTAMP(6),
UPDATE_BY             VARCHAR2(50),
UPDATE_DATE           TIMESTAMP(6)
alter table PROMOTION_DTL
add constraint PROMOTION_DTL_PK primary key (PROMO_ID);
alter table PROMOTION_DTL
add constraint PROMO_EVENT_FK foreign key (EVENT)
references SP_PROMO_EVENT_MST (EVENT);
-- Create/Recreate indexes
create index PROMOTION_IDX1 on PROMOTION_DTL (PROMO_ID, EVENT)
create unique index PROMOTION_PK on PROMOTION_DTL (PROMO_ID)
-- Grant/Revoke object privileges
grant select, insert, update, delete on PROMOTION_DTL to SCHEMA_RW_ROLE;I would like to partition this table .Most of the queries contains the following conditions.
promo_end_date >=   SYSDATE
and
(event = :input_event OR
(:input_Start_Date <= promo_end_date
AND promo_start_date <= :input_End_Date))Any time the promotion can be closed by updating the PROMO_END_DATE.
Interval partioning on PROMO_END_DATE is not possible as PROMO_END_DATE is a nullable and updatable field.
I am now to table partition.
Any suggestions are welcome...

DO NOT POST THE SAME QUESTION IN MULTIPLE FORUMS PLEASE!
Suggestions for table partition of existing tables

Insert values of form on a table with compound primary keys in APEX

Good evening,
I have a table with compoud primay keys. On ER model I had a many to many relation and when I coverted to relational model I've got a table with the primary keys of the two entities.
My problem now is that I am trying to build an APEX application with a Form/Report and I want to insert a tuple both on the "entity" and on the table with two primary keys.
I created a trigger with
CREATE OR REPLACE TRIGGER ins_key_elem
INSTEAD OF INSERT
ON v_key_elem
REFERENCING NEW AS NEW
FOR EACH ROW
BEGIN
INSERT INTO elem_type (elem_key, type_key)
VALUES (:NEW.elem_key, :NEW.type_key);
INSERT INTO elem(elem_key, name)
VALUES (:NEW.elem_key, :NEW.name);
END;
Is that ok? If it is, now how I can use that trigger to do what I need? i.e. insert the tuple on the two tables when I use the create button of the form
Edited by: 934530 on May 15, 2012 2:36 PM

Nevermind...figured it out. Was able to set the value on the Report Attributes page.

Updating a table with no Primary key

What I am trying to find out is if you can uniquely update a single record in a table that has no primary key. I see no way to reference the record I want, other than specifying all the field values in a where clause. This is a problem though, because if I have another record with the same field values, that will get updated too. (I know its a bad database design, but some people do it and I need to work around it!!!), there are some situations where you would have identical records as far as a where clause is concerned, for example, you cant use a blob in a where clause so that might be where your records differ...
In SQLServer 2000, Enterprise manager throws an error if you have a table with no primary key and duplicate records that you try to update through the GUI. EM uses stored procedures to execute updates, and it rolls back ones which result in more than one update result.
Im not too familiar with Cursors in SQL, only that they are quite slow and not implemented on all DB products. But I think that they might be able to solve the problem (but I dont logically see how).
Can anybody explain this to me?

another record with the same field valuesIf you have two records and all the field values are the same then the records are logically the same anyways, so it shouldn't matter if you update both (one would question why there are two records in the first place.) In other words there is no way, either computationally or manually to tell them apart.
I suspect that that is rather rare. Instead what is more likely is that you are only using some of the fields. So just keep adding fields until it is unique.

Help.......... required :Database table with no primary key

Hi All,
I have a table sponsor_logos whose structure is as follows:
sl__sponsorid number,
sl__clubid number,
sl_hallno varchar2(7) not null,
sl_logofilename varchar2(100) not null,
sl_date_modified date not null
Where in the sl__sponsorid and sl__clubid are foreign keys and I do not have any primary key for the table.
I need to insert into and also delete records from the table.
I have gone through various topics in the java forum for EJB's to find out what design strategy should I use?
Some say that if a table does not have primary keys, and if the table is represented by a CMP entity bean all the fields of the table are considered as a part of primary key.In that case what would my code look like and what would my deployment descriptor contain?????
According to the specification, the CMP or a BMP represents a unique record in a database.In that case should I be using a Session bean to handle insertions and deletions for the table?
Since this is my first project with EJB's I am really confused as to what design should I be using for this situation. Since I have a time constraint I can't take a long time to decide on what strategy I should use.
Suggestions regarding this are welcome .

Hi Maris,
I have my PK class ready with all the fields in it.
Deployment descriptor ready with <prim-key-class>package.SponsorLogoPK</prim-key-class>
. According to descriptor specification there is no need to have an entry for
<primkey-field>bookingSlNo</primkey-field>
in case of custom primary key .
So I have omitted <primkey-field>bookingSlNo</primkey-field>
I have used the verifier tool and verified the ejb , no errors with regards to this ejb, but , getting errors while deploying:
An error has occurred.
Deployment Error -- Error while running ejbc -- Fatal Error from EJB Compiler -- JDO74025: JDOCodeGenerator: Caught an Exception validating CMP bean 'SponsorLogoBean' in application 'resnet_ejb' module 'E:\Sun\AppServer\domains\domain1\applications\j2ee-modules\resnet': JDO72335: If the table SPONSOR_LOGOS for the bean corresponding to the generated class com.resnet.squash.api.entity.SponsorLogoBean483209734_JDOState is mapped as the primary table, it must have a primary key. Choose a different primary table or verify that the contents of the schema file are correct.
Now what could the problem be . Do I need to do any other setting in the descriptor. I have the cmp-mapping also intact.

DBMS_CDC find only the columns that are changed along with the primary key in the table

Hello,
We are having a requirement to find the change data in the production environment.
We are planning to use the DBMS_CDC utility.
But for example in the create change table 1 picked emp_id,ename, address, salary,dob.
I have a sample data of
empid
ename
address
salary
DOB
1
test1
24 test street
2000
20-Jan-98
2
test2
25 test street
2500
15-Aug-97
if ename for empid 1 is changed to test1_test3 from test1.
My CDC is capturing the values in the old and new values in the 5 columns.
But i need to get only the empid (primary key of the source table) and the ename column as only that's been updated not the rest of the 3 columns.
Can i accomplish this.
Please advice.

Hello,
Thanks for the information.
but if i change the change table then i will miss the other columns right?
I want to get the columns( empid and ename) only if ename is changed. i.e when ever any column in emp table changes i need to get all the columns where the data is changed along with the primary key columns empid.
Is there any way i can tweak the parameters so that i can achieve this or is there any other way using the cdc i can get this data.
Thanks

ResultSet updateRow ,insertRow ,deleteRow APIs on table with no PRIMARY KEY

Hi,
When I use ResultSet.insertRow , updateRow ,deleteRow API's on a table which contais no primary key column I find the following Exception ,
java.sql.SQLException: Operation invalid. No primary key for the table
at com.tandem.sqlmx.Messages.createSQLException(Messages.java:69)
at com.tandem.sqlmx.SQLMXResultSet.getKeyColumns(SQLMXResultSet.java:3501)
at com.tandem.sqlmx.SQLMXResultSet.prepareInsertStmt(SQLMXResultSet.java:3652)
at com.tandem.sqlmx.SQLMXResultSet.insertRow(SQLMXResultSet.java:2073)
at testdateupdate.main(testdateupdate.java:33)
It looks like the table needs to have a primary key column to update or insert or delete rows using the ResultSret APIs.
I use a proprietary JDBC driver. I find the Explanation for this behavior like this ,
JDBC allows update stmts on tables w/out a primary key defined if the stmt is issued by the application. For updateable ResultSets, a primary key restriction is required to avoid updating more rows than desired.I dont understand this explanation and also I dont find this behavior is some other JDBC drivers that I tried with.
Some one Please Clarify the same.
Thanks in Advance.
Thanks and Regards,
Jay

Hi,
in simple words, when a table does not have primary key you can send update and delete on it only by using a Statement object. When using ResultSet.updateRow or ResultSet.deleteRow the jdbc looks for the primary key on the metadata in order to send the correct where clause to the rdbms. I think that this could maybe work with Oracle DBMS, which has a unique id (ROWID) for each record.
Kiros

Partitioning an Existing Table using DBMS_REDEFINITION with no primary key?

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