Regarding Partitioning of table

Guys,
I have a table with 2 years worth of daily data and would like to partition it on monthly basis. Thus the table will have 24 partitions. When a select on this table is encountered based on the date column in the table, will Oracle automatically find the partition to which this date belongs or does the query explicitly need to state which partition to use?
Thanks,
Saff

Oracle should automatically choose the right partitions as described in this partition pruning example.

Similar Messages

Problem regarding partitioning of tables

hi all....good afternoon
I have a table of huge number of records and thats why I want to do partitioning of that table.
The column upon which I have to make the partition is of varchar2(7) type which contains the data in the format '2009APR', '2010JAN' etc etc..
Now I have to fetch out the first 4 characters of the datas (i.e only the year) and then I can partition the table based on the years.
How can I do that....plss help.
create table test123
(name varchar2(10),
age number,
DOB varchar2(7),
gender varchar2(1)
Edited by: user12780416 on Dec 24, 2010 2:48 AM

Just partition by DOB column:
SQL> create table test123(
2                       name varchar2(10),
3                       age number,
4                       DOB varchar2(7),
5                       gender varchar2(1)
6                      )
7    partition by range(DOB)
8      (
9       partition DOB_past values less than('2009'),
10       partition DOB_2009 values less than('2010'),
11       partition DOB_2010 values less than('2011'),
12       partition DOB_maxvalue values less than(maxvalue)
13      )
14 /
Table created.
SQL> insert into test123 values('X',0,'2010APR','M')
2 /
1 row created.
SQL> select count(*) from test123 partition(DOB_2010)
2 /
COUNT(*)
         1
SQL> insert into test123 values('Y',0,'2009JAN','M')
2 /
1 row created.
SQL> select count(*) from test123 partition(DOB_2009)
2 /
COUNT(*)
         1
SQL> SY.

Problem regarding partitioning tables

hi all....good afternoon
I have a table of huge number of records and thats why I want to do partitioning of that table.
The column upon which I have to make the partition is of varchar2(7) type which contains the data in the format '2009APR', '2010JAN' etc etc..
Now I have to fetch out the first 4 characters of the datas (i.e only the year) and then I can partition the table based on the years.
How can I do that....plss help.
The database is in 10g..
create table test123
(name varchar2(10),
age number,
DOB varchar2(7),
gender varchar2(1)
);

user12780416 wrote:
hi all....good afternoon
I have a table of huge number of records and thats why I want to do partitioning of that table.
The column upon which I have to make the partition is of varchar2(7) type which contains the data in the format '2009APR', '2010JAN' etc etc..
Now I have to fetch out the first 4 characters of the datas (i.e only the year) and then I can partition the table based on the years.
How can I do that....plss help.
The database is in 10g..
create table test123
(name varchar2(10),
age number,
DOB varchar2(7),
gender varchar2(1)
);I suggest you instead of this varchar column with date column like dat.And use this column as partition key.For example.
create table test123
(name varchar2(10),
age number,
DOB varchar2(7),
gender varchar2(1),
dat date
partition by range (dat)
partition part1 values LESS THAN (TO_DATE(' 2009-01-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN')),
partition part2 values LESS THAN (TO_DATE(' 2009-04-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN')),
partition part3 values LESS THAN (TO_DATE(' 2009-07-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN')),
partition part4 values LESS THAN (TO_DATE(' 2009-10-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN')),
partition part5 values LESS THAN (TO_DATE(' 2010-01-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
)

Problem while partitioning The Table

create table Employee ( empno number(3), name varchar2(10), deptno number(4))
partition by range(deptno)
(partition p1 values less than(11),
partition p2 values less than(21),
partition p3 values less than(31));
create table Employee (
ERROR at line 1:
ORA-00439: feature not enabled: Partitioning
Please help me for solving this problem and send me the details I need to partition my table.
Thanks in advance.
w.regards
R.Satish

Looks like you don't have partition license or don't have a complete install of Oracle version 8.0.5. The best way to check is do a sqlplus user/passwd and look for a message that said "Production with the Partitioning and objects options" to appear before the SQL> prompt. Hope this helps....
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by rkumar:
create table Employee ( empno number(3), name varchar2(10), deptno number(4))
partition by range(deptno)
(partition p1 values less than(11),
partition p2 values less than(21),
partition p3 values less than(31));
create table Employee (
ERROR at line 1:
ORA-00439: feature not enabled: Partitioning
Please help me for solving this problem and send me the details I need to partition my table.
Thanks in advance.
w.regards
R.Satish <HR></BLOCKQUOTE>
null

Need help in deciding type of partition for tables

Hi,
I have few tables which have millions of record. In some of the tables, we have data of previous years, which we dont use now. Can we create a partition table for such type of tables.
On other tables, How to decide if we have to use range/list/hash partitioning on our tables.
Do i need to recreate indexes for this tables after creating partition tables.
Please guide me.
Best Regards,

Partitioning decisions are based upon how you will access the data.
If you access by date then partition by date.
If you access by means of a list of values then use list.
If you there is no pattern and you just need to break the data up into smaller buckets use hash.
I see no reason why, based on what you have written, range partitioning by date would not be worthy of consideration.

Partitioning Fact Table

Hi
In our data warehouse we have a Fact table which has grown quite a large in size around 17 million records. We have been pondering on the options to partition this table.
Unfortunately this fact table does not have any date columns , all columns are surrogate keys of dimensions, even for time dimensions. My idea is to partition by range by manually specifying the surrogate key ranges of time dimension. Is that the way one proced with?
Other option is to, add a new column to the Fact Table and populate with the corresponding "ddmmyyyy" in number format and use that one to partition the table. If I go with this approach, if in my reports / queries if I use the dimension key to join between the Fact and Dimension, will oracle still identify which partition to look for? Or do I MUST use the partitioned column in the queries for partition pruning to be effective.
Any thoughts would be useful.
Regards
Mahesh

if in my reports / queries if I use the dimension key to join between the Fact and Dimension, will oracle still identify which partition to look for? No the oracle will not use the Partition Prunning in this case.
Or do I MUST use the partitioned column in the queries for partition pruning to be effective.yes , you need to use the partitioned column for partition pruning to be effective.
Cheers
Nawneet

Partition of table in ODI

Hi..friends.
can we use partition of table in ODI 11g?
please give an example with video or picture representation.
Regards
Soumya.

Its still not clear if we can load data in parallel in different partition if yes then how. Do we need to create seperate interface to load data in each partition?
Thanks
Kashi

Partitioning the tables

i have a table that logs an actigtivity
it has activity date time
its a very large table...which i havnt partitioned.
because i havnt got the archiving requirements.
my questions is .. should i blindly create a monthly partition based on date key or should i wait for the archiving requirements?
what is the criteria to partition the table?
is it the amount of data ... or the archiving strategy. which one of these two should i take as the deciding factor to create partitions
regards
raj

my problem is that
i have two tables A and B
A has a column called activity date time and B is the child table for A.
i did not create partitions on both the tables because... i did not know the online data requirement.
now for a code move people are complaining that i did not create monthly partitions before...
my quesitioon is that...
shouldnt we wait for the online data requirement to come then think of partitioning the table?
or rather than waiting
should we blindly create the monthly partitions on activity date time?
regards
raj

Looking to partition BSEG table in 46C

The SAP partitioning engine isn't available in 46C but I need to partition my BSEG table (currently 1072GB).
I am looking for the "partitioning key" to use on this table.
Can anybody provide an example of their DDL to give me a starting point.
Thanks in advance.

Paul Zytariuk wrote:
Hi Orkun,
>
> We are looking at (testing) archiving FI_DOCUMNT and it's poor performance which is why I am looking at partitioning specific tables (with BSEG being our largest table). We have multiple years worth of data to archive. I have read the note that you have referenced and all SAP notes that I could find about partitioning and was hoping to find the sql used in the "SAP Partitioning Engine" so I could apply/execute it manually in my environment or the actual DDL generated by SAP. The underlying tables BSIS, BSET, BSAK, BSAS, and BSAD are also on my list too. My Management is looking for recommendations or best practices from SAP (I also have a support message open with them) before I can move forward.
>
> Thanks,
> Paul.
Hi Paul,
By the way as far as I know that Oracle does not support
partitioning of clustered tables or indexes on clustered tables.
Did you checked my statement? RFBLG is a cluster table.
When you try to create a partition on this table you will face with "ORA-14085: partitioned table cannot have column with LONG datatype" error. It has a LONG RAW field.
Best regards,
Orkun Gedik

Limit on the number of partitions a table can have

Hi,
It's been quite some time I'm thinking of a simple and the best solution to a performance issue in my application. Benefiting out of partitioning the table seems a simplest approach; it involves very minimal changes to my application code and in addition, it keeps the overall application logic 100% intact. However, at times, the number of partitions required can grow to as large as 500 thousand. I know of another application implementing as many as 50 thousand partitions for one of its tables. I'm wondering if Oracle recommends or poses any limit to a number of partitions the table can have. How does that limit, if it exists, vary if each of my table partition holds only a small amount of data; say, not more than 2 thousand records each of 1 KB size. What are the important considerations that one needs to keep in mind while creating the huge number of partitions for a table?
Any inputs on this would be a great help.
Thanks,
Aniruddh
ps: Consider Oracle releases 10g onwards.
Edited by: Aniruddh on Dec 30, 2009 9:46 AM
Edited by: Aniruddh on Dec 30, 2009 9:50 AM

Aniruddh,
>
What are the important considerations that one needs to keep in mind while creating the huge number of partitions for a table?
>
I doubt if you are using partitioning for the right causes. Please explain how is your data structured and why you need to create so many partitions..?
when creating partition, you need to consider..
a) why you need to partition?
b) how is your data structured
c) how your data is indexed.
d) What kind of queries would you firing on this table to get the data. Will they use the partition key ?
Thanks,
Rajesh.
Please mark this/any other answer as helpful or answered if it is so. If not, provide additional details/feedback.
Always try to provide create table and insert statements to help the forum members help you better.

PL/SQL- Problem in creating a partitioned fact table using select as syntax

Hi All,
I am trying to create a clone(mdccma.fact_pax_bkng_t) of existing fact table (mdccma.fact_pax_bkng) using dynamic pl/sql. However, pl/sql anonymous block errors out with following error:
SQL> Connected.
SQL> SQL> DECLARE
ERROR at line 1:
ORA-00911: invalid character
ORA-06512: at "SYS.DBMS_SYS_SQL", line 1608
ORA-06512: at "SYS.DBMS_SQL", line 33
ORA-06512: at line 50
Here is pl/sql block:
-- CREATING FPB_T
DECLARE
v_owner VARCHAR2(32) := 'MDCCMA';
v_table_original VARCHAR2(32) := 'FACT_PAX_BKNG';
v_table VARCHAR2(32) := 'FACT_PAX_BKNG_T';
v_tblspc VARCHAR2(32) := v_owner||'_DATA';
CURSOR c_parts IS SELECT TABLESPACE_NAME, PARTITION_NAME,HIGH_VALUE, ROW_NUMBER() OVER (ORDER BY PARTITION_NAME) AS ROWNUMBER
FROM USER_TAB_PARTITIONS
WHERE TABLE_NAME = v_table_original
ORDER BY PARTITION_NAME;
v_cmd CLOB := EMPTY_CLOB();
v_cmd3 varchar2(300) := 'CREATE TABLE ' ||v_owner||'.'||v_table||' TABLESPACE '||v_tblspc
||' NOLOGGING PARTITION BY RANGE'||'(' ||'SNAPSHOT_DTM '||')' ||'(';
v_part VARCHAR2(32);
v_tblspc_name VARCHAR2(32);
v_row number;
v_value LONG;
v_tmp varchar2(20000);
v_cur INTEGER;
v_ret NUMBER;
v_sql DBMS_SQL.VARCHAR2S;
v_upperbound NUMBER;
BEGIN
v_cmd := v_cmd3;
OPEN c_parts;
FETCH c_parts INTO v_tblspc_name, v_part,v_value, v_row;
WHILE c_parts%FOUND
LOOP
IF (v_row = 1) THEN
v_tmp := ' PARTITION '||v_part||' VALUES LESS THAN ' ||'('|| v_value||')'||' NOLOGGING TABLESPACE '||v_tblspc_name;
ELSE
v_tmp := ', PARTITION '||v_part||' VALUES LESS THAN ' ||'('|| v_value||')'||' NOLOGGING TABLESPACE '||v_tblspc_name;
END IF;
v_cmd := v_cmd || v_tmp;
-- DBMS_OUTPUT.PUT_LINE(v_cmd);
FETCH c_parts INTO v_tblspc_name, v_part,v_value, v_row;
END LOOP;
-- DBMS_OUTPUT.PUT_LINE('Length:'||DBMS_LOB.GETLENGTH(v_cmd));
v_cmd := v_cmd||')'||' AS SELECT ' || '*'||' FROM ' || v_owner||'.'|| v_table_original ||' WHERE '||'1'||'='||'2'||';';
v_upperbound := CEIL(DBMS_LOB.GETLENGTH(v_cmd)/256);
FOR i IN 1..v_upperbound
LOOP
v_sql(i) := DBMS_LOB.SUBSTR(v_cmd
,256 -- amount
,((i-1)*256)+1 -- offset
END LOOP;
v_cur := DBMS_SQL.OPEN_CURSOR;
DBMS_SQL.PARSE(v_cur, v_sql, 1, v_upperbound, FALSE, DBMS_SQL.NATIVE);
v_ret := DBMS_SQL.EXECUTE(v_cur);
CLOSE c_parts;
DBMS_OUTPUT.PUT_LINE(v_cmd);
-- EXECUTE IMMEDIATE v_cmd ;
END;
The above pl/sql creates a DDL for partitioned fact table(new) based on an existing fact table and get executes through CLOB.
Please look into the issue and let me know any changes or modifications/suggestions that are required to fix the issue. Any help is appreciated.
Thank You,
Sudheer

Think this is your problem:
v_cmd := v_cmd||')'||' AS SELECT ' || '*'||' FROM ' || v_owner||'.'|| v_table_original ||' WHERE '||'1'||'='||'2'||';';Remove the SQL terminator ';' ... dynamic SQL doesn't require it, try this instead:
v_cmd := v_cmd||')'||' AS SELECT ' || '*'||' FROM ' || v_owner||'.'|| v_table_original ||' WHERE '||'1'||'='||'2';Thanks
Paul

Partitioning of table in oracle 10g - How to Add

Hello Friends ,
Hope you are all fine and doing great.
By the way - I have a quick question on oracle 10g Partitioning of tables...
I have a table with partition as stated below ..
CREATE TABLE X_ACC_ASSETS_GPC_AGG
X_ACC_ASSETS_GPC_AGG_RK NUMBER(10) NOT NULL,
X_AS_OF_DT DATE NOT NULL,
ACCOUNT_RK NUMBER(10) NOT NULL,
X_UNIV_ACCOUNT_ID NUMBER(10),
ACCOUNT_ID VARCHAR2(10 BYTE),
X_ASSET_TYPE_CD VARCHAR2(6 BYTE),
X_AUC_AMT NUMBER(18,5),
X_FIRM_AMT NUMBER(18,5),
X_ADJ_SRCE_AMT NUMBER(18,5),
PROCESSED_DTTM DATE
)PARTITION BY RANGE (X_AS_OF_DT)
PARTITION P200712 VALUES LESS THAN (TO_DATE(' 2008-01-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
NOLOGGING
NOCOMPRESS
TABLESPACE KAW_DATA
PCTFREE 10
INITRANS 1
MAXTRANS 255
STORAGE (
INITIAL 64K
MINEXTENTS 1
MAXEXTENTS 2147483645
BUFFER_POOL DEFAULT
PARTITION P201112
NOLOGGING
NOCOMPRESS
TABLESPACE KAW_DATA
PCTFREE 10
INITRANS 2
MAXTRANS 255
STORAGE (
INITIAL 64K
MINEXTENTS 1
MAXEXTENTS 2147483645
BUFFER_POOL DEFAULT
PARTITION PMAX
NOLOGGING
NOCOMPRESS
TABLESPACE KAW_DATA
PCTFREE 10
INITRANS 2
MAXTRANS 255
STORAGE (
INITIAL 64K
MINEXTENTS 1
MAXEXTENTS 2147483645
BUFFER_POOL DEFAULT
)NOPARALLEL;
My question is :
1) How to add a partition say P201201 ..
Since I have already stated PARTITION PMAX can I still add partition?
2) Can I add partition even though the table has data ?
==========================
I tried to add partition ..say
ALTER TABLE X_ACC ADD PARTITION P201201 VALUES LESS THAN
(TO_DATE(' 2012-01-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
NOLOGGING
NOCOMPRESS
TABLESPACE KAW_DATA
PCTFREE 10
INITRANS 1
MAXTRANS 255
STORAGE (
INITIAL 64K
MINEXTENTS 1
MAXEXTENTS 2147483645
BUFFER_POOL DEFAULT
but getting the error ..
"partition bound must collate higher than that of the last partition"
Thanks/kumar

You have partitions
200712
200812
200912
201012
201112
PMAX.
so your condition for partition p201112 is '201012-01-01' to '201112-01-01' i.e the values between these two dates will be in partition p201112. and then everything else will be in PMAX. So now you are splitting your pmax.
alter table X_acc split partition pmax at ( to_date('2012-01-01 00:00:00','YYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN') )
into (partition p201201, partition pmax); The condition you have to change. I just showed as an example. It could be the date range between two dates or it could be greater than a date value. It is upto how you want this new partition.
how to add partition between two partition
Edited by: pransuj on Mar 25, 2011 11:13 AM
Edited by: pransuj on Mar 25, 2011 11:14 AM

Sql server partition parent table and reference not partition child table

Hi,
I have two tables in SQL Server 2008 R2, Parent and Child Table.
Parent has date time, and it is partitioned monthly, there is a Child table which just refer the Parent table using Foreign key relation.
is there any problem the non-partitioned child table referring to a partitioned parent table?
Thanks,
Areef

The tables will need to be offline for the operation. "Offline" here, means that you wrap the entire operation in a transaction. Ideally, this transaction would:
1) Drop the foreign key.
2) Use ALTER TABLE SWITCH to drop the old data.
3) Use ALTER PARTITION FUNCTION to drop the old empty partition.
4) Use ALTER PARTITION FUNCTION to add a new empty partition.
5) Reapply the foreign keys WITH CHECK.
All but the last operation are metadata-only operation (provided that you do them right). To perform the last operation, SQL Server must scan the child tbale and verify that all keys are present in the parent table. This can take some time for larger tables.
During the transaction, SQL Server holds Sch-M locks on the table, which means that are entirely inaccessible, even for queries running with NOLOCK.
You avoid this the scan by applying the fkey constraint WITH NOCHECK, but this can have impact on query plans, as SQL Server will not consider the constraint as trusted.
An alternative which should not be entirely dismissed is to use partitioned
views instead. With partitioned views, the foreign keys are not an issue, because each partition is a pair of tables, with its own local fkey.
As for the second question: it appears to be completely pointless to partition the parent, but not the child table. Or does the child table only have rows for a smaller set of the rows in the parent?
Erland Sommarskog, SQL Server MVP, [email protected]

Partitioning of tables in oracle 1og

I want to do the partitioning of tables due to increasing their size.Can anyone guide me cn I do it? Is it possible to do it?If possible then how can i do it.plz guide mme with al qeuries.
thanks.

While it is certainly possible to partition tables (assuming you have the enterprise edition and the partitioning option), that is not something that you would generally want to take a cookbook approach to. Partitioning tables incorrectly is a great way to slow down the system and make it oodles more difficult to support. Partitioning requires a fair amount of architecture and design to get right, and that, in turn, requires that you understand how partitioning works, how your application works, and what you want partitioning to do to change the way your application works.
Justin

Partitioning A table on a data column

Hi,
My requirement is to partition a table using a column with DATE datatype.
Example:
CREATE TABLE parttab
STATUS CHAR(1) DEFAULT 'a' NOT NULL,
UPDATER VARCHAR2(55) NOT NULL,
UPDTIME DATE DEFAULT SYSDATE NOT NULL
TABLESPACE part_tbs
Now i want to RANGE partition the above table on the "UPDTIME" column, so that it will look like:
Partition Value from Value till
P1 01-Jan 31-Mar
P2 01-Apr 30-Jun
P3 01-Jul 30-Sep
P4 MAXVALUE
I tried using the below syntax, but failed with error.
CREATE TABLE parttab
STATUS CHAR(1) DEFAULT 'a' NOT NULL,
UPDATER VARCHAR2(55) NOT NULL,
UPDTIME DATE DEFAULT SYSDATE NOT NULL
TABLESPACE part_tbs
LOGGING
PARTITION BY RANGE (UPDTIME)
PARTITION P1 VALUES LESS THAN (to_date('04','MM')) LOGGING COMPRESS TABLESPACE part_tbs_P1,
PARTITION P2 VALUES LESS THAN (to_date('07','DD-MM')) LOGGING COMPRESS TABLESPACE part_tbs_P2,
PARTITION P3 VALUES LESS THAN (to_date('10','DD-MM')) LOGGING COMPRESS TABLESPACE part_tbs_P3,
PARTITION P4 VALUES LESS THAN (MAXVALUE) LOGGING COMPRESS TABLESPACE part_tbs_P4
COMPRESS
NOCACHE
PARALLEL ( DEGREE 2 INSTANCES Default )
ROWDEPENDENCIES
NOMONITORING
ENABLE ROW MOVEMENT;
Please suggest.
Thanks in advance for the suggestions.

what is the error message and your Oracle version? this sample may assist I guess -
CREATE TABLE range_part (
prof_history_id NUMBER(10),
person_id       NUMBER(10) NOT NULL,
organization_id NUMBER(10) NOT NULL,
record_date     DATE NOT NULL,
ph_comments     VARCHAR2(200))
PARTITION BY RANGE (record_date) (
PARTITION yr0 VALUES LESS THAN (TO_DATE('01-JAN-2000','DD-MON-YYYY'))
TABLESPACE part1,
PARTITION yr1 VALUES LESS THAN (TO_DATE('01-JAN-2001','DD-MON-YYYY'))
TABLESPACE part2,
PARTITION yr2 VALUES LESS THAN (TO_DATE('01-JAN-2002','DD-MON-YYYY'))
TABLESPACE part3,
PARTITION yr9 VALUES LESS THAN (MAXVALUE) TABLESPACE part4);for more examples you may visit - http://psoug.org/reference/partitions.html

Regarding Partitioning of table

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