Vertical Partitioning in Oracle

Hi,
Can any body please give me idea how can a table be partitioned vertically in oracle. Is vertical partitioning possible in oracle? If it is possible then, please give an example of it.
Regards,
Koushik

Vertical partitioning, or create a table with few columns and an other table with other columns, right ?
This feature is "implemented" through the cluster table.
A key column (which is your cluster) to join the two "partitions tables" rows.
Take a look here : Managing Clusters
Nicolas.

Similar Messages

Creating Partitions in Oracle 10G Express Edition

Can I create partitions in oracle 10g express edition?

See yourself :
http://download.oracle.com/docs/cd/B25329_01/doc/license.102/b25456/toc.htm#BABJIJCJ

Automatic table partitioning in Oracle 11g

Hi All,
I need to implement automatic table partitioning in Oracle 11g version, but partitioning interval should be on daily basis(For every day).
I was able to perform this for Monthly and Yearly but not on daily basis.
create table part
(a date)PARTITION BY RANGE (a)
INTERVAL (NUMTOYMINTERVAL(1,'*MONTH*'))
(partition p1 values less than (TO_DATE('01-NOV-2007','DD-MON-YYYY'))
Table created
create table part
(a date)PARTITION BY RANGE (a)
INTERVAL (NUMTOYMINTERVAL(1,'*YEAR*'))
(partition p1 values less than (TO_DATE('01-NOV-2007','DD-MON-YYYY'))
Table createdBut if i use DD or DAY instead of YEAR or MONTH it fails......Please suggest me how to perform this on daily basis.
SQL>
1 create table part
2 (a date)PARTITION BY RANGE (a)
3 INTERVAL (NUMTOYMINTERVAL(1,'*DAY*'))
4 (partition p1 values less than (TO_DATE('01-NOV-2007','DD-MON-YYYY'))
5* )
SQL> /
INTERVAL (NUMTOYMINTERVAL(1,'DAY'))
ERROR at line 3:
ORA-14752: Interval expression is not a constant of the correct type
SQL> create table part
(a date)PARTITION BY RANGE (a)
INTERVAL (NUMTOYMINTERVAL(1,'*DD*'))
(partition p1 values less than (TO_DATE('01-NOV-2007','DD-MON-YYYY'))
); 2 3 4 5
INTERVAL (NUMTOYMINTERVAL(1,'DD'))
ERROR at line 3:
ORA-14752: Interval expression is not a constant of the correct typePlease suggest me to resolve this ORA-14752 error for using DAY or DD or HH24
-Yasser

Yes, for differenct partitions for different months.
interval (numtoyminterval(1,'MONTH'))
store in (TS1,TS2,TS3)
This code will store data in partitions in tablespaces TS1, TS2, and TS3 in a round robin manner.
for Day wise day yes you can store
INTERVAL (NUMTODSINTERVAL(1,'day')) or
INTERVAL (NUMTODSINTERVAL(2,'day')) or
INTERVAL (NUMTODSINTERVAL(3,'day')) or
INTERVAL (NUMTODSINTERVAL(4,'day')) or
INTERVAL (NUMTODSINTERVAL(5,'day')) or
INTERVAL (NUMTODSINTERVAL(n,'day'))

Table Partitioning in Oracle 8i

Can tables be partitioned in Oracle 8i Standard Edition, or do I have to have the Enterprise Edition? I'm trying to deal with backup of a large database, and want to consider performinig partial backups to save time/resources. Thanks.

Hi,
You need entreprise edition for that.
no other way

Table Partitioning in Oracle 9i

Hi all,
I have a question on partitioning in Oracle 9i.
I have a parent table with primary key A1 and attribute A2. A2 is not a primary key but I would to create partition for the table based on this attribute. I have a child table with attribute B1 being a foreign key to A1.
I wish to perform a data purging on the parent and child table. I'll purge the parent table based on A2, but for the child table, it will be inefficient if I delete all records in child table where parent.A1 = child.B1. Should I add a new attribute A2 to the child table, partition the child table based on this attribute or is there a better way to do it?
Thanks in advance for all replies.
Cheers,
Bernard

Bernard
Right 100K in the parent...but how many in the child ?
I guess it comes back to what I said earlier...you can either take the hit on the cascaded delete to get out the records on the child table or you can denormalise the column down onto the child table in order to partition by it.
I'm building a Data Warehouse currently and we're using the denormalise approach on a couple of tables in order to allow them to be equipartitioned and enable easier partition management and DML operations as you've indicated....but our tables have 100's of millions of rows in them so we really need to do that for manageability.
100K records in the parent - provided the ratio to the child is not such that on average each deleted parent has 100's of children is probably not too onerous, especially for a monthly batch process - the question there would be how much time do you have to do this at the end of the month ? I'd probably suggest you set up a quick test and benchmark it with say 10K records as a representative sample (can do all 100K if you have time/space) - then assess that load/time against your month end window....if its reasonably quick then no need to compromise your design.
You should also consider whether the 100K is going to remain consistent over time or is it going to grow rapidly in which that would sway you towards adding the denormalisation for partitioning approach at the outset.
HTH
Jeff

Problems Faced with Partitions in Oracle 9i.

I have a doubt regarding the partitions in Oracle 9i can you please help me regarding this?
Create table t1
( x number,
y number,
z number);
insert into t1 values (1,1,1);
insert into t1 values (2,2,2);
insert into t1 values (3,3,3);
Create table t2
x number,
y number,
z number
partition by range(x)
partition p1 values less than(2),
partition p2 values less than(3),
partition p3 values less than(4),
partition p4 values less than(maxvalue)
alter table t2 exchange partition p1 with table t1;
SQL> alter table t2 exchange partition p1 with table t1;
alter table t2 exchange partition p1 with table t1
ERROR at line 1:
ORA-14099: all rows in table do not qualify for specified partition
WHAT DOES THIS ERROR MESSAGE MEAN? I AM NOT ABLE TO UNDERSTAND THIS? WHAT NEED's TO BE DONE TO RESOLVE THIS?
alter table t2 exchange partition p1 with table t1 WITHOUT VALIDATION;
SQL> SELECT * FROM T2;
X Y Z
1 1 1
2 2 2
3 3 3
SQL> SELECT * FROM T2 PARTITION(P1);
X Y Z
1 1 1
2 2 2
3 3 3
SQL> SELECT * FROM T2 PARTITION(P2);
no rows selected
SQL> SELECT * FROM T2 PARTITION(P3);
no rows selected
(i) Why i am facing this error ORA-14099: while partitioning? Can you please brief me about this ?
(ii) why there is not data's in the PARTITIONS p2 &p3 after the partitions is exchanged WITHOUT VALIDATION options?
what is going with this method?
(iii) Also can you please explain me with an example how to partitions a table having milliion of records with EXCHANGE PARTITION Options with MULITPLE partition segment's (say partition based on status id column with 6 differnt values i am thinking to use list partitions using status_id as partition key) ?
Also i have tried the below approch is this a right approch? please correct me if i am wrong.
Create table t1
( x number,
y number,
z number);
insert into t1 values (1,1,1);
insert into t1 values (2,2,2);
insert into t1 values (3,3,3);
commit;
Create table t2
x number,
y number,
z number
partition by range(x)
partition p1 values less than(2),
partition p2 values less than(3),
partition p3 values less than(4),
partition p4 values less than(maxvalue)
SQL> insert into t2 select * from t1;
3 rows created.
SQL> commit;
Commit complete.
SQL> SELECT * FROM T2 PARTITION(P1);
X Y Z
1 1 1
SQL> SELECT * FROM T2 PARTITION(P2);
X Y Z
2 2 2
SQL> SELECT * FROM T2 PARTITION(P3);
X Y Z
3 3 3
SQL> SELECT * FROM T2 PARTITION(P4);
no rows selected
EXPLAIN PLAN
FOR SELECT * FROM T2 WHERE X = 1
| Id | Operation | Name | Rows | Bytes | Cost | Pstart| Pstop |
| 0 | SELECT STATEMENT | | 1 | 9 | 2 | | |
| 1 | TABLE ACCESS FULL | T2 | 1 | 9 | 2 | 1 | 1 |
Now my question is what is problem instead of using EXCHANGE PARTITION why caun't we follow this above approch?
to partition a non-partitioned table?
Thanks,
Rajesh.

The value of 3 should obviously should go into the partition P3.Then why are you putting it into p1?
Your command,
<tt> alter table t2 exchange partition <b>p1</b> with table t1;</tt>
will swap partition p1 with the contents of table t1, leaving you with partition p1 containing the three values that were in t1. At first it told you there were rows in t1 that did not belong in that partition, but you used FORCE so it put them in anyway.
btw there are notes in the FAQ about how to use ** tags to format your posts.
~Edited by: William Robertson on Oct 15, 2008 6:49 AM~

Vertical variable in oracle developer report 6i

Hi
I want to define a vertical variable in oracle report 6i but this ''Only text and boilerplate can be rotated''
what can I do that?

Hello,
Only Text Boilerplate can be rotated but you can reference a variable in a Boilerplate using a "lexical reference" :
ex:
if your SQL query is :
select ename from emp
Set the boilerpate text to :
&ename
to display the value of ename.
Of course, the boilerplate must be in the repeating frame having the SQL query group as source.
Regards

How to display horizontally to vertically column in oracle

Dear All
How to display horizontally to vertically column in oracle,Please give me Sol. ASAP

Sunil,
Which column is the sal column? I canât see any numeric columns in your query. If you use htmldb_item calls in your query column, then this makes them strings and you canât build sums on string columns. If you want to build sums in an updateable report / tabular form, then donât use the htmldb_item API. Instead use the built-in display types on the report column attributes page. Using the built-in display types is the better options in most cases anyway and they do allow you to calculate sums even if the column is a text field or display and save type field.
Regards,
Marc

Not able to create partitions using Oracle 10g express edition

Hello Everyone,
I downloaded Oracle 10g express edition as the documentation for the same says that it supports partitioning of the table.
But when I try to run a command like
CREATE TABLE sales_range
(salesman_id NUMBER(5),
salesman_name VARCHAR2(30),
sales_amount NUMBER(10),
sales_date DATE)
PARTITION BY RANGE(sales_date)
PARTITION sales_jan2000 VALUES LESS THAN(TO_DATE('02/01/2000','DD/MM/YYYY')),
PARTITION sales_feb2000 VALUES LESS THAN(TO_DATE('03/01/2000','DD/MM/YYYY')),
PARTITION sales_mar2000 VALUES LESS THAN(TO_DATE('04/01/2000','DD/MM/YYYY')),
PARTITION sales_apr2000 VALUES LESS THAN(TO_DATE('05/01/2000','DD/MM/YYYY'))
I get the following error
"ORA-00439: feature not enabled: Partitioning"
Please let me know what is causing the issue/error and how to resolve it.
Thanks.

Where did you read that the express edition supports partitioning? I would strongly suspect that there was an error in the documentation-- partitioning is an extra cost option on top of an enterprise edition database. Perhaps you are confusing the personal edition (which does support partitioning) with the express edition?
Justin

XML Partitioning in Oracle 10.2

Was wondering regarding a possible opportunity with a broker client, is it possible (or will there be a back patch or sorts) to XML partition as known in 11.1.0.7 for XMLType OR, lets say Oracle database version 10.2.0.5.0 ?
Thx
Marco

Have you read the deprecated features list in 11.2? Not that it is that important, they will be supported for a while to come, and internally (eg. packages) they make still use of things like extractvalue, extract, etc, but regarding the functional index approach, there are definitely better solutions in Oracle 11gRx like the (unstructured) XMLIndex...

Partitioning in Oracle -- Need some clarification

Hello all,
While I was reading the document (PDF) on Oracle9i Data Warehousing Guide (Part No: Part No. A90237-01), I found one statement which made me confused.
The statement is regarding Hash Partitioning:
"Hash partitioning is a good and easy-to-use alternative
to range partitioning when data is not historical and there is no obvious column or column list where logical range partition pruning can be advantageous."
Can anyone suggest me, does this means that Hash Partitioning is not recommended for Data Warehouse type (DSS) applications? If yes, then I will be glad to know Why they are not recomended?
I would also like to know the practical differences between Range Partition and Hash Partition.

There are three types of partitioned tables in Oracle 8i: Range, Hash and
Composite. Range partitioning requires that rows identified by a "partition key"
fall into a predefined range of values. The value of a columns' "partition key"
determines the partition to which a row belongs.
A hash-partitioned table's rows have their physical location determined by
applying a hash value to the partition key column, providing for deterministic,
but well distributed physical data spread.
A composite-partitioned table has a two-part partition key, the leftmost being
a range-partition key and the rightmost being a hash partition key.
Composite-partitioned tables make use of subpartitions for their hashed
components. A composite-partitioned table consists of a set of
range-partitions, which are each composed of hashed-partitions.
Oracle9i adds a new partitioning model called list partitioning to the
set of partition methods already being supported in the Oracle RDBMS.
The new List method allows explicit control over how rows map to partitions,
by allowing to specify a list of discrete values for the partitioning column
in the description of each partition. One should use list partitioning
when you want to specifically map rows to partitions based on discrete values.
Hash partitioning is best used when the data does not easily lend itself to range
partitioning, but you would like to partition for performance reasons. Hash
partitioning evenly distributes data across a specified number of partitions.
Rows are mapped into partitions based on a hash value of the partitioning key.
When creating hash partitions, you must specify the method as "HASH", the
partitioning column(s) in the HASH, and the number of partitions or individual
partition descriptions.
http://asktom.oracle.com/pls/ask/f?p=4950:8:14565727566304844437::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:14188448949723
Jaffar

Partitioning on Oracle 8.0.6 (rule base vs. cost base)

At my current engagement, we are using Oracle Financials 11.0.3 on Oracle 8.0.5 which uses rule-based optimizer. However, it is been planned to upgrade the database from Oracle 8.0.5 to Oracle 8.0.6 as well as implement Oracle partitioning. With this in mind, we are concerned about possible performance issues that the implementation of partitioning may cause since RBO does not recognize it.
We agree that the RBO will see a non-partitioned table the same as a partitioned. In this scenario where you gain the most is with backup/recoverability and general maintenance of the partitioned table.
Nevertheless, we have a few questions:
When implementing partitions, will the optimizer choose to go with Cost base vs. Rule base for these partitioned tables?
Is it possible that the optimizer might get confused with this?
If this change form RBO to CBO does occur, the application could potential perform poorly because of the way it has been written.
Please provide any feedback.
thanks in advance.

If the CBO is invoked when accessing these tables, you may run into problems.
- You'll have to analyze your tables & ensure that the statistics are kept up to date.
- It's possible that any SQL statements which invoke the CBO rather than the RBO will have different performance characteristics. The SYSTEM data dictionary tables, for example, must use the RBO or their performance suffers dramatically. Most of the time, the CBO beats the RBO, but applications which have been heavily tuned with the RBO may have problems with the CBO.
- Check your init.ora to see what optimizer mode you're in. If you're set to CHOOSE, the CBO will be invoked whenever statistics are available on the table(s) involved. If you choose RULE, you'll only invoke the CBO when the RBO encounters situations it doesn't have rules for.
Justin

Partitioning on Oracle 8i (Rule Based vs. Cost Based)

At my current engagement, we are using Oracle Financials 11.0.3 on Oracle 8.0.6. The application uses rule-based optimizer. The client wants to implement Oracle partitioning. With this in mind, we are concerned about possible performance issues that the implementation of partitioning may cause since RBO does not recognize it.
We agree that the RBO will see a non-partitioned table the same as a partitioned. In this scenario where you gain the most is with backup/recoverability and general maintenance of the partitioned table.
Nevertheless, we have a few questions:
When implementing partitions, will the optimizer choose to go with Cost base vs. Rule base for these partitioned tables?
Is it possible that the optimizer might get confused with this?
Could it degrade performance at the SQL level?
If this change from RBO to CBO does occur, the application could potential perform poorly because of the way it has been written.
Please provide any feedback.
Thanks in advance.

If the CBO is invoked when accessing these tables, you may run into problems.
- You'll have to analyze your tables & ensure that the statistics are kept up to date.
- It's possible that any SQL statements which invoke the CBO rather than the RBO will have different performance characteristics. The SYSTEM data dictionary tables, for example, must use the RBO or their performance suffers dramatically. Most of the time, the CBO beats the RBO, but applications which have been heavily tuned with the RBO may have problems with the CBO.
- Check your init.ora to see what optimizer mode you're in. If you're set to CHOOSE, the CBO will be invoked whenever statistics are available on the table(s) involved. If you choose RULE, you'll only invoke the CBO when the RBO encounters situations it doesn't have rules for.
Justin

A select from internal partition crashes Oracle

I have the following INTERNAL partitioned table and local index by BUREAU_CODE:
CREATE TABLE fin_mea (
    fin_mea_uid                    NUMBER NOT NULL,
    fiscal_month_uid               NUMBER NOT NULL,
    fiscal_year_uid                NUMBER NOT NULL,
    bureau_code                    VARCHAR2(3) NOT NULL,
    main_acct_code                 VARCHAR2(4),
    sub_acct_code                  VARCHAR2(3),
    net_amt                        NUMBER(23,2))
PARTITION BY RANGE (fiscal_month_uid)
INTERVAL (1)
(PARTITION fmea_initial VALUES LESS THAN (200501) );
CREATE INDEX fin_mea_bureau_idx ON fin_mea (bureau_code ASC) LOCAL;
When I try to select rows from non-existing partition with a condition which uses indexed column Oracle crashes with 'End of communication channel' error:
SELECT * FROM fin_mea partition for (201301) a where a.bureau_code = 'ZZZ'
The following one works even no rows selected:
select * from (SELECT * FROM fin_mea partition for (201301)) a where a.bureau_code = 'ZZZ';
If I delete index then first query works with no problem:
SELECT * FROM fin_mea partition for (201301) a where a.bureau_code = 'ZZZ'
Is this a bug or am I doing something wrong?
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0

The following is the full script. I renamed field names and removed tablespace section.
SQL*Plus: Release 10.2.0.1.0 - Production on Fri Jul 19 18:23:38 2013
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> drop table fin_mea;
Table dropped.
SQL> CREATE TABLE tfs.fin_mea (
2      fin_mea_uid          NUMBER NOT NULL,
3      field2               NUMBER NOT NULL,
4      fiscal_month_uid     NUMBER NOT NULL,
5      field4               NUMBER NOT NULL,
6      field5               NUMBER NOT NULL,
7      field6               NUMBER NOT NULL,
8      field7               NUMBER NOT NULL,
9      field8               VARCHAR2(24) NOT NULL,
10      field9               NUMBER NOT NULL,
11      bureau_code          VARCHAR2(3) NOT NULL,
12      field11              VARCHAR2(3),
13      field12              VARCHAR2(3),
14      field13              NUMBER(4),
15      field14              NUMBER(4),
16      field15              VARCHAR2(1),
17      field16              VARCHAR2(4),
18      field17              VARCHAR2(3),
19      field18              NUMBER(4),
20      field19              NUMBER(4),
21      field20              NUMBER(5),
22      field21              VARCHAR2(3),
23      field22              VARCHAR2(2),
24      field23              NUMBER(4),
25      net_amt              NUMBER(23,2))
26    PARTITION BY RANGE (fiscal_month_uid)
27    INTERVAL (1)
28    (PARTITION fmea_initial VALUES LESS THAN (200501) )
29    PCTFREE     10
30    INITRANS    1
31    MAXTRANS    255
32    NOCACHE
33    MONITORING
34    NOPARALLEL
35    LOGGING
36 /
Table created.
SQL>
SQL> CREATE INDEX tfs.fin_mea_org_idx ON tfs.fin_mea LOCAL
2    (bureau_code ASC
3    )
4    PCTFREE     10
5    INITRANS    2
6    MAXTRANS    255
7    NOPARALLEL
8    LOGGING
9 /
Index created.
SQL>
SQL> SELECT * FROM fin_mea partition for (201301) a where a.bureau_code = 'ZZZ';
SELECT * FROM fin_mea partition for (201301) a where a.bureau_code = 'ZZZ'
ERROR at line 1:
ORA-03113: end-of-file on communication channel

How to choose the partition in oracle tables?

Dear all,
i m in need to create the partitions on prod.db tables since i m not aware of creating partitions?i just go through some theroy concepts and understood the range and list partitions (i.e)Range is normally used for values less than like jan,feb,march or values less than 50,000 values less than 1,00,000 like that each partition is having separate tablespaces to increase the performance. and for list is used to denoting the directions like west,east,north,south like that.
Now what i want to know is ?
1.)when will i can go ahead with partitions?
2.)before creating partitions is it advise to create index or not needed?
3.)if i started to create partition what is the leading column have to create partition and which partition has to choose?
pls let me know and pardon me if i did any mistakes.
thanks in advance..

I had to research on same topic. One of my teammates suggested few points that might help you also.
Advantages of partitioning:
1) Partitioning enables data management operations such data loads, index creation and rebuilding, and backup/recovery at the partition level, rather than on the entire table. This results in significantly reduced times for these operations.
2) Partitioning improves query performance. In some cases, the results of a query can be achieved by accessing a subset of partitions, rather than the entire table. Parallel queries/DML and Partition-wise Joins are also got benefited much.
3) Partitioning increases the availability of mission-critical databases if critical tables and indexes are divided into partitions to reduce the maintenance windows, recovery times, and impact of failures. (Each partition can have separate physical attributes such as pctfree, pctused, and tablespaces.)
Partitioning can be implemented without requiring any modifications to your applications. For example, you could convert a nonpartitioned table to a partitioned table without needing to modify any of the SELECT statements or DML statements which access that table. You do not need to rewrite your application code to take advantage of partitioning.
Disadvantages of partitioning:-
1) Advantages of partition nullified when you use bind variables.
Additional administration tasks to manage partitions viz. If situation arises for rebuilding of index then rebuilding should to be done for each individual partition.
2) Need more space to implement partitioning objects.
3) More time for some tasks, such as create non-partitioning indexes, collection of “global" statistics (dbms_stat’s granularity parameter to be set to GLOBAL. if sub partition are used then we have to set it to ALL).
4) Partition would implies a modification (of explain plan) for ALL the queries against the partitioned tables. So, if some queries use the choosing partition key and may greatly improve, some other queries not use the partition key and are dramatically bad impact by the partitioning.
5) To get the full advantage of partitioning (partition pruning, partition-wise joins, and so on), you must use the Cost Based Optimizer (CBO). If you use the RBO, and a table in the query is partitioned, Oracle kicks in the CBO while optimizing it. But because the statistics are not present, the CBO makes up the statistics, and this could lead to severely expensive optimization plans and extremely poor performance.
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Abou

Vertical Partitioning in Oracle

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