I was trying to change table from range-hash to list-hash but it come difficult for me
Can you write example for this type of partitioning.
edit
actually i finally create something
create table T_COMPLEX
(
ID NUMBER,
TIME_ID DATE
)
partition by LIST (TIME_ID)
SUBPARTITION BY HASH (ID)
(
partition k1 VALUES ('02-DEC-2002'),
partition k2 VALUES ('17-APR-2003'),
partition k3 VALUES ('15-OCT-2004'),
partition k4 VALUES ('12-APR-2006')
);
can u tell is it all fine here,mb i can modify this
Related
CREATE TABLE temp_stud as select * from STUD_MAST
PARTITION BY RANGE(ADM_DT)
(
PARTITION temp_stud1 VALUES LESS THAN(TO_DATE('02/01/2000','MM/DD/YYYY')),
PARTITION temp_stud2 VALUES LESS THAN(TO_DATE('03/01/2000','MM/DD/YYYY')),
PARTITION temp_stud3 VALUES LESS THAN(TO_DATE('04/01/2000','MM/DD/YYYY')),
PARTITION temp_stud4 VALUES LESS THAN(TO_DATE('05/01/2000','MM/DD/YYYY'))
);
I am getting a missing left parenthesis error for above table creation can anyone tell me what is the issue in above creation
Note: ADM_DT is a date column with data type char(8) and storing format YYMMDD
Please use below SQL. The Creation of Partition has be part of Create table.
CREATE TABLE temp_stud
PARTITION BY RANGE(ADM_DT)
(
PARTITION temp_stud1 VALUES LESS THAN(TO_DATE('02/01/2000','MM/DD/YYYY')),
PARTITION temp_stud2 VALUES LESS THAN(TO_DATE('03/01/2000','MM/DD/YYYY')),
PARTITION temp_stud3 VALUES LESS THAN(TO_DATE('04/01/2000','MM/DD/YYYY')),
PARTITION temp_stud4 VALUES LESS THAN(TO_DATE('05/01/2000','MM/DD/YYYY'))
)
as select * from STUD_MAST;
I have a table with 2017 and 2018 year data. Need to create monthly partition on that table.
So I created one non partitioned table and loaded all the data from original table. now I am converting the new table to a monthly partitioned table.
When I am altering getting error as
ORA-14300: partitioning key maps to a partition outside maximum
permitted number of partitions
My Script is
ALTER TABLE ORDERHDR_PART MODIFY
PARTITION BY RANGE (LASTUPDATE) INTERVAL(NUMTOYMINTERVAL(1, 'MONTH'))
(
PARTITION ORDERHDR_PART_JAN VALUES less than (TO_DATE('01-02-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_FEB VALUES less than (TO_DATE('01-03-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_MAR VALUES less than (TO_DATE('01-04-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_APR VALUES less than (TO_DATE('01-05-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_MAY VALUES less than (TO_DATE('01-06-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_JUN VALUES less than (TO_DATE('01-07-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_JUL VALUES less than (TO_DATE('01-08-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_AUG VALUES less than (TO_DATE('01-09-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_SEP VALUES less than (TO_DATE('01-10-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_OCT VALUES less than (TO_DATE('01-11-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_NOV VALUES less than (TO_DATE('01-12-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_DEC VALUES less than (TO_DATE('01-01-2019','DD-MM-YYYY'))
)ONLINE;
I think your approach is wrong.
First create a partitioned table, e.g.
CREATE TABLE ORDERHDR_PART (....)
PARTITION BY RANGE (LASTUPDATE) INTERVAL (NUMTOYMINTERVAL(1, 'MONTH'))
(
PARTITION ORDERHDR_INITIAL VALUES less than (DATE '2000-01-01')
);
Then transfer existing data to the new table.
Either you use a simple INSERT INTO ORDERHDR_PART SELECT * FROM ORDERHDR_2017;
Oracle will create monthly partitions automatically based on LASTUPDATE value.
With this methods you would duplicate (temporary) your data and/or you may face a performance issue.
The other method is to use Exchanging Partitions, should be like this
ALTER TABLE ORDERHDR_PART
EXCHANGE PARTITION FOR (DATE '2017-01-01')
WITH TABLE ORDERHDR_2017
INCLUDING INDEXES;
I don't know whether "PARTITION FOR (DATE '2017-01-01')" is created automatically, perhaps you have to run INSERT INTO ORDERHDR_PART (LASTUPDATE) VALUES (DATE '2017-01-01'); ROLLBACK; in order to create it first.
You will get one partition for all months, afterwards you can split the partition with Splitting into Multiple Partitions. Should be like this:
ALTER TABLE ORDERHDR_PART SPLIT PARTITION FOR (DATE '2017-01-01') INTO (
PARTITION ORDERHDR_PART_JAN VALUES less than (TO_DATE('01-02-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_FEB VALUES less than (TO_DATE('01-03-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_MAR VALUES less than (TO_DATE('01-04-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_APR VALUES less than (TO_DATE('01-05-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_MAY VALUES less than (TO_DATE('01-06-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_JUN VALUES less than (TO_DATE('01-07-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_JUL VALUES less than (TO_DATE('01-08-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_AUG VALUES less than (TO_DATE('01-09-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_SEP VALUES less than (TO_DATE('01-10-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_OCT VALUES less than (TO_DATE('01-11-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_NOV VALUES less than (TO_DATE('01-12-2018','DD-MM-YYYY')),
PARTITION ORDERHDR_PART_DEC VALUES less than (TO_DATE('01-01-2019','DD-MM-YYYY'))
);
Note, by default you cannot drop the inital partition of a RANGE partitioned table. If you face this problem execute:
ALTER TABLE ORDERHDR_PART SET INTERVAL ();
ALTER TABLE ORDERHDR_PART DROP PARTITION ORDERHDR_INITIAL;
ALTER TABLE ORDERHDR_PART SET INTERVAL (NUMTOYMINTERVAL(1, 'MONTH'));
I'm trying to partition my table using the ID column such that all even ID's should go in partition_1 and odd ID's should go in partition_2. The only closest thing that met my needs was virtual columns.
CREATE TABLE sales
(
id NUMBER(6) NOT NULL,
mod_id AS (MOD(id, 2))
);
PARTITION BY RANGE (mod_id)
(
PARTITION mod_id VALUES LESS THAN(1),
PARTITION mod_id VALUES LESS THAN(2),
)
Is there a better way than this?
As you are using MOD function to calculate mod_id, your column would have only 2 values (0 & 1),
In that case you can go with LIST partition as below.
CREATE TABLE sales
(
id NUMBER(6) NOT NULL,
mod_id AS (MOD(id, 2))
)
PARTITION BY LIST (mod_id)
(PARTITION mod_id0 VALUES (0),
PARTITION mod_id1 VALUES (1));
It is certain that records with odd id will to partition mod_id1 and even into mod_id0.You can verify it using below query:select * from sales partition (mod_id1);
Below the simplified structure of a table:
create table customer(
incident_id number,
customer_id number,
customer_name varchar2(400),
sla_id number
failure_start_date date,
failure_end_date date,
churn_flag number, -- 0 or 1
active number, -- 0 or 1
constraint pk_incident_id primary key (incident_id))
PARTITION BY LIST (active)
SUBPARTITION BY LIST (churn_flag)
SUBPARTITION TEMPLATE
( SUBPARTITION sp_churn_flag_1 VALUES (1)
, SUBPARTITION sp_churn_flag_0 VALUES (0)
)
(PARTITION sp_active_1 values (1)
, PARTITION sp_active_0 VALUES (0)
)
,
ENABLE ROW MOVEMENT COMPRESS FOR QUERY LOW;
Now I need to add additonally to the existing Composite-List-Partition an Interval-Range-Partitioning, in order to partitionate the data by month (failure_starte_date - YYYYMM). The table contains data from 200701 up to now (201511). Failure_start_date < 2013 should be partitionied into one partition for older data. All newer months should have an dedicated partition, whereas partitions for upcoming months shall be created automatically.
How can this be integrating into the already existing partitoning?
You cannot do it exactly the way you want. Partitioning strategies are limited in two relevant ways: first, composite strategies can only have two levels (you need 3) and second, interval partitioning, when used in a composite strategy must be at the top level.
Here is the closest legal thing to what you want:
CREATE TABLE matt_customer
(
incident_id NUMBER,
customer_id NUMBER,
customer_name VARCHAR2 (400),
sla_id NUMBER,
failure_start_date DATE,
failure_end_date DATE,
churn_flag VARCHAR2 (1), -- 0 or 1
active VARCHAR2 (1), -- 0 or 1
active_churn_flags VARCHAR2 (2) GENERATED ALWAYS AS (active || churn_flag) VIRTUAL,
CONSTRAINT pk_incident_id PRIMARY KEY (incident_id)
)
PARTITION BY RANGE
(failure_start_date)
INTERVAL ( NUMTOYMINTERVAL (1, 'MONTH') )
SUBPARTITION BY LIST
(active_churn_flags)
SUBPARTITION TEMPLATE (
SUBPARTITION sp_ac_00 VALUES ('00'),
SUBPARTITION sp_ac_01 VALUES ('01'),
SUBPARTITION sp_ac_10 VALUES ('10'),
SUBPARTITION sp_ac_11 VALUES ('11'))
(PARTITION customer_old VALUES LESS THAN (TO_DATE ('01-JAN-2013', 'DD-MON-YYYY')))
ENABLE ROW MOVEMENT
--COMPRESS FOR QUERY LOW;
;
This uses interval-list partitioning, and uses a virtual column to combine your active and churn_flag columns into one (I turned those columns into VARCHAR2(1) for simplicity.
To make use of partition pruning, your queries would need to be modified to select active_churn_flags = '01' for example, instead of specifying values for active and churn_flag independently.
Assuming following table:
create table INVOICE(
INVOICE_ID NUMBER
,INVOICE_SK NUMBER
,INVOICE_AMOUNT NUMBER
,INVOICE_TEXT VARCHAR2(4000 Char)
,B2B_FLAG NUMBER -- 0 or 1
,ACTIVE NUMBER(1) -- 0 or 1
)
PARTITION BY LIST (ACTIVE)
SUBPARTITION BY LIST (B2B_FLAG)
( PARTITION p_active_1 values (1)
( SUBPARTITION sp_b2b_flag_11 VALUES (1)
, SUBPARTITION sp_b2b_flag_10 VALUES (0)
)
,
PARTITION p_active_0 values (0)
( SUBPARTITION sp_b2b_flag_01 VALUES (1)
, SUBPARTITION sp_b2b_flag_00 VALUES (0)
)
)
For perfomance reasons the table should get a "Composite List-List" partitioning, see http://docs.oracle.com/cd/E18283_01/server.112/e16541/part_admin001.htm#i1006565.
The problematic point is, that the ACTIVE-Flag will change requently for a huge amount of records and sometimes also the B2B_FLAG. Will Oracle automatically recognize the records, for which the partitioning value has changed and move them to the appropriate partion or do I have to call some kind of maintenance function, in order to reorganize the partitions?
You need to enable row movement on the table or the update statement will fail with ORA-14402: updating partition key column would cause a partition change.
See the following testcase:
create table T_TESTPART
(
pk number(10),
part_key number(10)
)
partition by list (part_key) (
partition p01 values (1),
partition p02 values (2),
partition pdef values (default)
);
alter table T_TESTPART
add constraint pk_pk primary key (PK);
Now insert a row and try to update the partitioning value:
insert into t_testpart values (1,1);
update t_testpart set part_key = 2 where pk = 1;
You will now get the Error mentioned above.
If you enable row movement, the same statement will work and oracle will move the row to the other partition:
alter table t_testpart enable row movement;
update t_testpart set part_key = 2 where pk = 1;
I did not do any performance tests, but Oracle will probably delete the row from the first partition and insert it to the second partition. Consider this when using it in large scale.
In my own databases, I usually only use partitioning on columns that do not change.
Further reading:
http://www.dba-oracle.com/t_callan_oracle_row_movement.htm