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Oracle Partitioned Tables & Indexes
Version 11.1
 
General

Partition Related Data Dictionary Objects
indpart$ indsubpart$ partobj$ tabpart$
indpart_param$ partlob$ subpartcol$ tabsubpart$
DBA, ALL, & USERS
dba_tab_cols
dba_ind_partitions
dba_ind_subpartitions
dba_lob_partitions
dba_lob_subpartitions
dba_subpartition_templates
dba_subpart_col_statistics
dba_subpart_histograms
dba_subpart_key_columns
dba_tab_partitions
dba_tab_subpartitions
Note: Oracle supports partitioning only for tables, indexes on tables, materialized views, and indexes on materialized views. Oracle does not support partitioning of clustered tables or indexes on clustered tables.
 
Definitions
Partition Decompose a table or index into smaller, more manageable pieces, called partitions. Each partition of a table or index must have the same logical attributes, such as column names, datatypes, and constraints, but each partition can have separate physical attributes such as pctfree, pctused, and tablespaces.
Partition Key Each row in a partitioned table is unambiguously assigned to a single partition. The partition key is a set of from 1 to 16 columns that determines the partition for each row.
Subpartition Partitions created within partitions. They are just partitions themselves and there is nothing special about them.
Composite Partitioning Composite partitioning is a combination of other partitioning methods. Oracle currently supports range-hash and range-list composite partitioning.
Interval Partitioning Interval partitioning is an extension to range partitioning in which, beyond a point in time, partitions are defined by an interval. Interval partitions are automatically created by the database when data is inserted into the partition.
Explain Plan PSTART/PSTOP Values
KEY(I) IN subquery
KEY(SQ) Recursive subquery

Invalidating Indexes
By default, the following operations on partitions on a heap-organized table mark all global indexes as unusable:
  • ADD (HASH)
  • COALESCE (HASH)
  • DROP
  • EXCHANGE
  • MERGE
  • MOVE
  • SPLIT
  • TRUNCATE
Global Index A single index covering all partitions.
Hash Partitioning Enables partitioning of data that does not lend itself to range or list partitioning.
-- To view the numbers Oracle uses for hashing:

SELECT program, sql_hash_value, prev_hash_value
FROM gv$session;
List Partitioning Explicitly controls how rows map to partitions. You do this by specifying a list of discrete values for the partitioning key in the description for each partition.
Local Index Separate indexes for each partition. A local index can be unique. However, in order for a local index to be unique, the partitioning key of the table must be part of the index's key columns. Unique local indexes are useful for OLTP environments. You cannot explicitly add a partition to a local index. Instead, new partitions are added to local indexes only when you add a partition to the underlying table.
Range Partitioning Maps data to partitions based on ranges of partition key values that you establish for each partition.
Referential Partitioning Data is mapped to partitions based on values defined in a referential constraint (foreign key) 
Partitioning Pruning Oracle optimizes SQL statements to mark the partitions or subpartitions that need to be accessed and eliminates (prunes) unnecessary partitions or subpartitions from access. Partition pruning is the skipping of unnecessary index and data partitions or subpartitions by a query.
 
Demo Tablespaces

Create demo tablespaces
CREATE TABLESPACE part1
DATAFILE 'c: emp\part01.dbf' SIZE 10M
BLOCKSIZE 8192
EXTENT MANAGEMENT LOCAL UNIFORM SIZE 256K
SEGMENT SPACE MANAGEMENT AUTO
ONLINE;

CREATE TABLESPACE part2
DATAFILE 'c: emp\part02.dbf' SIZE 10M
BLOCKSIZE 8192
EXTENT MANAGEMENT LOCAL UNIFORM SIZE 256K
SEGMENT SPACE MANAGEMENT AUTO
ONLINE;

CREATE TABLESPACE part3
DATAFILE 'c: emp\part03.dbf' SIZE 10M
BLOCKSIZE 8192
EXTENT MANAGEMENT LOCAL UNIFORM SIZE 256K
SEGMENT SPACE MANAGEMENT AUTO
ONLINE;

CREATE TABLESPACE part4
DATAFILE 'c: emp\part04.dbf' SIZE 10M
BLOCKSIZE 8192
EXTENT MANAGEMENT LOCAL UNIFORM SIZE 256K
SEGMENT SPACE MANAGEMENT AUTO
ONLINE;

ALTER USER uwclass QUOTA UNLIMITED ON part1;
ALTER USER uwclass QUOTA UNLIMITED ON part2;
ALTER USER uwclass QUOTA UNLIMITED ON part3;
ALTER USER uwclass QUOTA UNLIMITED ON part4;
Drop demo tablespaces DROP TABLESPACE part1 INCLUDING CONTENTS AND DATAFILES;
DROP TABLESPACE part2 INCLUDING CONTENTS AND DATAFILES;
DROP TABLESPACE part3 INCLUDING CONTENTS AND DATAFILES;
DROP TABLESPACE part4 INCLUDING CONTENTS AND DATAFILES;
 
Table Partitions

Hash Partitioned Table
CREATE TABLE hash_part (
prof_history_id  NUMBER(10),
person_id        NUMBER(10) NOT NULL,
organization_id  NUMBER(10) NOT NULL,
record_date      DATE NOT NULL,
prof_hist_comments VARCHAR2(2000))
PARTITION BY HASH (prof_history_id)
PARTITIONS 3
STORE IN (part1, part2, part3);

desc hash_part

SELECT table_name, tablespace_name, partitioned
FROM user_tables;

desc user_tab_partitions

SELECT partition_name, tablespace_name
FROM user_tab_partitions;

Interval-Numeric Range Partitioned Table

Also possible are Interval-Hash and Interval-List

CREATE TABLE interval_part (
person_id   NUMBER(5) NOT NULL,
first_name  VARCHAR2(30),
last_name   VARCHAR2(30))
PARTITION BY RANGE (person_id)
INTERVAL (100) STORE IN (uwdata) (
PARTITION p1 VALUES LESS THAN (101))
TABLESPACE uwdata;

desc interval_part

SELECT table_name, tablespace_name, partitioned
FROM user_tables;

col high_value format a20

SELECT partition_name, tablespace_name, high_value
FROM user_tab_partitions;

INSERT INTO interval_part
(person_id, first_name, last_name)
VALUES
(100, 'Dan', 'Morgan');

SELECT partition_name, tablespace_name, high_value
FROM user_tab_partitions;

INSERT INTO interval_part
(person_id, first_name, last_name)
VALUES
(101, 'Heli', 'Helskyaho');

SELECT partition_name, tablespace_name, high_value
FROM user_tab_partitions;

INSERT INTO interval_part
(person_id, first_name, last_name)
VALUES
(567, 'Tara', 'Havemeyer');

SELECT partition_name, tablespace_name, high_value
FROM user_tab_partitions;

Interval-Date Range Partitioned Table
CREATE TABLE interval_date (
person_id NUMBER(5) NOT NULL,
last_name VARCHAR2(30),
dob DATE)
PARTITION BY RANGE (dob)
INTERVAL (NUMTOYMINTERVAL(1,'MONTH'))
STORE IN (uwdata) (
PARTITION p1 VALUES LESS THAN (TO_DATE('2008-03-15','YYYY-MM-DD')));

INSERT INTO interval_date
(person_id, last_name, dob)
VALUES
(1, 'Morgan', SYSDATE-365);

INSERT INTO interval_date
(person_id, last_name, dob)
VALUES
(2, 'Lofstrom', SYSDATE-365);

INSERT INTO interval_date
(person_id, last_name, dob)
VALUES
(3, 'Havemeyer', SYSDATE-200);

INSERT INTO interval_date
(person_id, last_name, dob)
VALUES
(4, 'Small', SYSDATE-60);

INSERT INTO interval_date
(person_id, last_name, dob)
VALUES
(5, 'Ellison', SYSDATE+60);

col partition_name format a14
col tablespace_name format a15
col high_value format a85

SELECT partition_name, tablespace_name, high_value
FROM user_tab_partitions;

List Partitioned Table (add tablespace names and change table name)
CREATE TABLE list_part (
deptno          NUMBER(10),
deptname        VARCHAR2(20),
quarterly_sales NUMBER(10,2),
state           VARCHAR2(2))
PARTITION BY LIST (state) (
PARTITION q1_northwest VALUES ('OR', 'WA') TABLESPACE part1,
PARTITION q1_southwest VALUES ('AZ', 'CA', 'NM') TABLESPACE part2,
PARTITION q1_northeast VALUES ('NY', 'VT', 'NJ') TABLESPACE part1,
PARTITION q1_southeast VALUES ('FL', 'GA') TABLESPACE part2,
PARTITION q1_northcent VALUES ('MN', 'WI') TABLESPACE part1,
PARTITION q1_southcent VALUES ('OK', 'TX') TABLESPACE part2);

SELECT table_name, tablespace_name, partitioned
FROM user_tables;

SELECT partition_name, tablespace_name, high_value
FROM user_tab_partitions;

INSERT INTO list_part VALUES (10, 'A', 1000, 'OR');
INSERT INTO list_part VALUES (20, 'B', 1000, 'AZ');
INSERT INTO list_part VALUES (10, 'A', 1000, 'WA');
INSERT INTO list_part VALUES (20, 'B', 1000, 'WA');
INSERT INTO list_part VALUES (10, 'A', 1000, 'AZ');
INSERT INTO list_part VALUES (20, 'B', 1000, 'CA');
COMMIT;

SELECT * FROM list_part;

SELECT * FROM list_part PARTITION (q1_northwest);

Range Partitioned
Table - By Date
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)
PARTITION BY RANGE (record_date) (
PARTITION yr0 VALUES LESS THAN (TO_DATE('01-JAN-2007','DD-MON-YYYY'))
TABLESPACE part1,
PARTITION yr7 VALUES LESS THAN (TO_DATE('01-JAN-2008','DD-MON-YYYY'))
TABLESPACE part2,
PARTITION yr8 VALUES LESS THAN (TO_DATE('01-JAN-2009','DD-MON-YYYY'))
TABLESPACE part3,
PARTITION yr9 VALUES LESS THAN (MAXVALUE) TABLESPACE part4);

SELECT table_name, tablespace_name, partitioned
FROM user_tables;

col part_name format a9
col tbsp_name format a9

SELECT partition_name PART_NAME, tablespace_name TBSP_NAME, high_value
FROM user_tab_partitions
WHERE table_name = 'RANGE_PART';

INSERT INTO range_part VALUES (1, 1, 1, SYSDATE-720);
INSERT INTO range_part VALUES (2, 2, 2, SYSDATE-360);
INSERT INTO range_part VALUES (3, 3, 3, SYSDATE-180);
INSERT INTO range_part VALUES (4, 4, 4, SYSDATE);

SELECT * FROM range_part;

SELECT * FROM range_part PARTITION (yr0);
SELECT * FROM range_part PARTITION (yr7);
SELECT * FROM range_part PARTITION (yr8);
SELECT * FROM range_part PARTITION (yr9);

conn / as sysdba

ALTER SESSION SET tracefile_identifier = 'range_part';
ALTER SESSION SET EVENTS '10128 trace name context forever, level 1';
SELECT * FROM uwclass.range_part PARTITION (yr8);
ALTER SESSION SET SQL_TRACE=FALSE;
 
Trace file c:\oracle\product\diag dbms\orabase\orabase race\orabase_ora_2976_range_part.trc
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production       q
With the Partitioning, Oracle Label Security, OLAP, Data Mining,
Oracle Database Vault and Real Application Testing options
Windows XP Version V5.1 Service Pack 3
CPU : 1 - type 586, 1 Physical Cores
Process Affinity : 0x00000000
Memory (Avail/Total): Ph:674M/2038M, Ph+PgF:2777M/3932M, VA:1275M/2047M
Instance name: orabase
Redo thread mounted by this instance: 1
Oracle process number: 24
Windows thread id: 2976, image: ORACLE.EXE (SHAD)


*** 2008-12-17 23:24:21.421
*** SESSION ID:(137.1810) 2008-12-17 23:24:21.421
*** CLIENT ID:() 2008-12-17 23:24:21.421
*** SERVICE NAME:(SYS$USERS) 2008-12-17 23:24:21.421
*** MODULE NAME:(sqlplusw.exe) 2008-12-17 23:24:21.421
*** ACTION NAME:() 2008-12-17 23:24:21.421

partition pruning descriptor:
type = 0, level = 1
flags = {single, known, set by parser, }
partition mapping descriptor:
partitioning method = range
number of partitions = 4
number of partitioning keys = 1
partitioning columns = (4)
partition pruning descriptor:
type = 0, level = 1
flags = {single, known, set by parser, }
partition mapping descriptor:
partitioning method = range
number of partitions = 4
number of partitioning keys = 1
partitioning columns = (4)
partition pruning descriptor:
type = 0, level = 1
flags = {single, known, set by parser, }
partition mapping descriptor:
partitioning method = range
number of partitions = 4
number of partitioning keys = 1
partitioning columns = (4)
partition pruning descriptor:
type = 0, level = 1
flags = {single, known, set by parser, }
partition mapping descriptor:
partitioning method = range
number of partitions = 4
number of partitioning keys = 1
partitioning columns = (4)

*** 2008-12-17 23:24:42.453
Partition Iterator Information:
partition level = PARTITION
call time = RUN
order = ASCENDING
Partition iterator for level 1:
iterator = RANGE [2, 2]
index = 2
current partition: part# = 2, subp# = 1048576, abs# = 2

*** 2008-12-17 23:25:04.359
Partition Iterator Information:
partition level = PARTITION
call time = RUN
order = ASCENDING
Partition iterator for level 1:
iterator = RANGE [2, 2]
index = 2
current partition: part# = 2, subp# = 1048576, abs# = 2

*** 2008-12-17 23:25:53.437
Partition Iterator Information:
partition level = PARTITION
call time = RUN
order = ASCENDING
Partition iterator for level 1:
iterator = RANGE [2, 2]
index = 2
current partition: part# = 2, subp# = 1048576, abs# = 2

x


Range Partitioned Table - By Alpha
CREATE TABLE students (
student_id NUMBER(6),
student_fn VARCHAR2(25),
student_ln VARCHAR2(25),
PRIMARY KEY (student_id))
PARTITION BY RANGE (student_ln) (
PARTITION student_ae VALUES LESS THAN ('F%') TABLESPACE part1,
PARTITION student_fl VALUES LESS THAN ('M%') TABLESPACE part2,
PARTITION student_mr VALUES LESS THAN ('S%') TABLESPACE part3,
PARTITION student_sz VALUES LESS THAN (MAXVALUETABLESPACE part4);

SELECT table_name, tablespace_name, partitioned
FROM user_tables;

SELECT partition_name, tablespace_name, high_value
FROM user_tab_partitions;

Referential Partitioned Table
SELECT MIN(num_rows), MAX(num_rows)
FROM all_tables
WHERE num_rows IS NOT NULL;

CREATE TABLE ref_parent (
table_name   VARCHAR2(30),
order_date   DATE,
num_rows     NUMBER)
PARTITION BY RANGE(num_rows) (
PARTITION num_rows1 VALUES LESS THAN (100) TABLESPACE part1,
PARTITION num_rows2 VALUES LESS THAN (1000) TABLESPACE part2,
PARTITION num_rows3 VALUES LESS THAN (10000) TABLESPACE part3,
PARTITION num_rows4 VALUES LESS THAN (MAXVALUE) TABLESPACE part4);

ALTER TABLE ref_parent
ADD CONSTRAINT pk_ref_parent
PRIMARY KEY (table_name)
USING INDEX;

desc ref_parent

SELECT table_name, tablespace_name, partitioned
FROM user_tables;

SELECT partition_name, tablespace_name
FROM user_tab_partitions;

CREATE TABLE ref_child (
table_name VARCHAR2(30) NOT NULL,
index_name VARCHAR2(30) NOT NULL,
CONSTRAINT fk_ref_child_parent
FOREIGN KEY(table_name) REFERENCES ref_parent(table_name))
PARTITION BY REFERENCE(fk_ref_child_parent);

SELECT table_name, partitioning_type, ref_ptn_constraint_name
FROM user_part_tables
WHERE table_name LIKE 'REF%';

Partition by System
CREATE TABLE syst_part (
tx_id   NUMBER(5),
begdate DATE)
PARTITION BY SYSTEM (
PARTITION p1 TABLESPACE part1,
PARTITION p2 TABLESPACE part2,
PARTITION p3 TABLESPACE part3);

INSERT INTO syst_part VALUES (1, SYSDATE-10);

INSERT INTO syst_part PARTITION (p1) VALUES (1, SYSDATE-10);
INSERT INTO syst_part PARTITION (p2) VALUES (2, SYSDATE);
INSERT INTO syst_part PARTITION (p3) VALUES (3, SYSDATE+10);

SELECT * FROM syst_part PARTITION (p2);

Partition by Virtual Column
CREATE TABLE vcol_part (
tx_id   NUMBER(5),
begdate DATE,
enddate DATE,
staylen NUMBER(5) AS (enddate-begdate))
PARTITION BY RANGE (staylen)
INTERVAL (10) STORE IN (uwdata) (
PARTITION p1 VALUES LESS THAN (11))
TABLESPACE uwdata;

desc vcol_part

SELECT table_name, tablespace_name, partitioned
FROM user_tables;

col high_value format a20

SELECT partition_name, tablespace_name, high_value
FROM user_tab_partitions;

desc user_tab_cols

SELECT column_name, virtual_column, data_default
FROM user_tab_cols
WHERE table_name = 'VCOL_PART';

INSERT INTO vcol_part
(tx_id, begdate, enddate)
VALUES
(1, SYSDATE-5, SYSDATE);

INSERT INTO vcol_part
(tx_id, begdate, enddate)
VALUES
(2, SYSDATE-10, SYSDATE);

INSERT INTO vcol_part
(tx_id, begdate, enddate)
VALUES
(3, SYSDATE-15, SYSDATE);

INSERT INTO vcol_part
(tx_id, begdate, enddate)
VALUES
(4, SYSDATE-25, SYSDATE);

COMMIT;

SELECT partition_name, tablespace_name, high_value
FROM user_tab_partitions;

EXPLAIN PLAN FOR
SELECT *
FROM vcol_part;

SELECT * FROM TABLE(dbms_xplan.display);

EXPLAIN PLAN FOR
SELECT *
FROM vcol_part
WHERE staylen < 11;

SELECT * FROM TABLE(dbms_xplan.display);

EXPLAIN PLAN FOR
SELECT *
FROM vcol_part
WHERE staylen BETWEEN 11 AND 20;

SELECT * FROM TABLE(dbms_xplan.display);

EXPLAIN PLAN FOR
SELECT *
FROM vcol_part
WHERE staylen >= 11;

SELECT * FROM TABLE(dbms_xplan.display);
 
Composite Partitions

Composite Partitioned
Table - By Range And Hash
CREATE TABLE composite_rng_hash (
cust_id     NUMBER(10),
cust_name   VARCHAR2(25),
amount_sold NUMBER(10,2),
time_id     DATE)
PARTITION BY RANGE(time_id)
SUBPARTITION BY HASH(cust_id)
SUBPARTITION TEMPLATE(
SUBPARTITION sp1 TABLESPACE part1,
SUBPARTITION sp2 TABLESPACE part2,
SUBPARTITION sp3 TABLESPACE part3,
SUBPARTITION sp4 TABLESPACE part4) (
PARTITION sales_pre05
VALUES LESS THAN (TO_DATE('01/01/2005','DD/MM/YYYY')),
PARTITION sales_2005
VALUES LESS THAN(TO_DATE('01/01/2006','DD/MM/YYYY')),
PARTITION sales_2006
VALUES LESS THAN(TO_DATE('01/01/2007','DD/MM/YYYY')),
PARTITION sales_2007
VALUES LESS THAN(TO_DATE('01/01/2008','DD/MM/YYYY')),
PARTITION sales_2008
VALUES LESS THAN(TO_DATE('01/01/2009','DD/MM/YYYY')),
PARTITION sales_future
VALUES LESS THAN(MAXVALUE));

set linesize 121
col table_name format a20

SELECT table_name, partitioned, secondary
FROM user_tables;

desc user_tab_partitions

col partition_name format a15
col spc format 99999
col high_value format a50

SELECT table_name, partition_name, composite, subpartition_count SPC, high_value
FROM user_tab_partitions;

desc user_tab_subpartitions

col subpartition_name format a20

SELECT table_name, partition_name, subpartition_name, subpartition_position
FROM user_tab_subpartitions;

desc user_subpartition_templates

col high_bound format a20

SELECT subpartition_name, tablespace_name, high_bound
FROM user_subpartition_templates;

conn sh/sh

GRANT select ON sales TO uwclass;
GRANT select on customers TO uwclass;

conn uwclass/uwclass

INSERT INTO composite_rng_hash
SELECT c.cust_id, c.cust_first_name || ' ' || c.cust_last_name,
s.amount_sold, s.time_id
FROM sh.sales s, sh.customers c
WHERE s.cust_id = c.cust_id
AND rownum < 250001;

exec dbms_stats.gather_table_stats(USER, 'COMPOSITE_RNG_HASH', 'SALES_PRE05');
exec dbms_stats.gather_table_stats(USER, 'COMPOSITE_RNG_HASH', 'SALES_2005');
exec dbms_stats.gather_table_stats(USER, 'COMPOSITE_RNG_HASH', 'SALES_2006');
exec dbms_stats.gather_table_stats(USER, 'COMPOSITE_RNG_HASH', 'SALES_2007');
exec dbms_stats.gather_table_stats(USER, 'COMPOSITE_RNG_HASH', 'SALES_2008');
exec dbms_stats.gather_table_stats(USER, 'COMPOSITE_RNG_HASH', 'SALES_FUTURE');

SELECT table_name, partition_name, num_rows
FROM user_tab_partitions;

SELECT table_name, partition_name, subpartition_name, num_rows
FROM user_tab_subpartitions;

exec dbms_stats.gather_table_stats(USER, 'COMPOSITE_RNG_HASH', GRANULARITY=>'ALL');

SELECT table_name, partition_name, subpartition_name, num_rows
FROM user_tab_subpartitions;

set long 1000000
select dbms_metadata.get_ddl('TABLE', 'COMPOSITE_RNG_HASH');

Composite Partitioned
Table - By Range And List
CREATE TABLE composite_rng_list (
cust_id     NUMBER(10),
cust_name   VARCHAR2(25),
cust_state  VARCHAR2(2),
time_id     DATE)
PARTITION BY RANGE(time_id)
SUBPARTITION BY LIST (cust_state)
SUBPARTITION TEMPLATE(
SUBPARTITION west VALUES ('OR', 'WA') TABLESPACE part1,
SUBPARTITION east VALUES ('NY', 'CT') TABLESPACE part2,
SUBPARTITION cent VALUES ('OK', 'TX') TABLESPACE part3) (
PARTITION
per1 VALUES LESS THAN (TO_DATE('01/01/2000','DD/MM/YYYY')),
PARTITION per2 VALUES LESS THAN (TO_DATE('01/01/2005','DD/MM/YYYY')),
PARTITION per3 VALUES LESS THAN (TO_DATE('01/01/2010','DD/MM/YYYY')),
PARTITION future VALUES LESS THAN(MAXVALUE));

desc composite_rng_list

SELECT table_name, partition_name, composite, high_value
FROM user_tab_partitions;

SELECT table_name, partition_name, subpartition_name, num_rows
FROM user_tab_subpartitions;

Composite Partitioned
Table - By Range And Range
CREATE TABLE composite_rng_rng (
cust_id     NUMBER(10),
cust_name   VARCHAR2(25),
cust_state  VARCHAR2(2),
time_id     DATE)
PARTITION BY RANGE(time_id)
SUBPARTITION BY RANGE (cust_id)
SUBPARTITION TEMPLATE(
SUBPARTITION original VALUES LESS THAN (1001) TABLESPACE part1,
SUBPARTITION acquired VALUES LESS THAN (8001) TABLESPACE part2,
SUBPARTITION recent VALUES LESS THAN (MAXVALUE) TABLESPACE part3) (
PARTITION
per1 VALUES LESS THAN (TO_DATE('01/01/2000','DD/MM/YYYY')),
PARTITION per2 VALUES LESS THAN (TO_DATE('01/01/2005','DD/MM/YYYY')),
PARTITION per3 VALUES LESS THAN (TO_DATE('01/01/2010','DD/MM/YYYY')),
PARTITION future VALUES LESS THAN (MAXVALUE));

desc composite_rng_rng

SELECT table_name, partition_name, composite, high_value
FROM user_tab_partitions;

SELECT table_name, partition_name, subpartition_name, num_rows
FROM user_tab_subpartitions;

Composite Partitioned
Table - By List And Hash
CREATE TABLE composite_list_hash (
cust_id     NUMBER(10),
cust_name   VARCHAR2(25),
cust_state  VARCHAR2(2),
time_id     DATE)
PARTITION BY LIST(cust_state)
SUBPARTITION BY HASH (cust_id)
SUBPARTITION TEMPLATE(
SUBPARTITION sp1 TABLESPACE part1,
SUBPARTITION sp2 TABLESPACE part2,
SUBPARTITION sp3 TABLESPACE part3,
SUBPARTITION sp4 TABLESPACE part4) (
PARTITION west VALUES ('OR', 'WA'),
PARTITION east VALUES ('NY', 'CT'),
PARTITION cent VALUES ('IL', 'MN'));

Composite Partitioned
Table - By List And List
CREATE TABLE composite_list_list (
cust_id     NUMBER(10),
cust_name   VARCHAR2(25),
cust_state  VARCHAR2(2),
time_id     DATE)
PARTITION BY LIST(cust_state)
SUBPARTITION BY LIST (cust_id)
SUBPARTITION TEMPLATE(
SUBPARTITION beg VALUES (1,3,5) TABLESPACE part1,
SUBPARTITION mid VALUES (2,4,6) TABLESPACE part2,
SUBPARTITION end VALUES (7,8,9,0) TABLESPACE part3) (
PARTITION west VALUES ('OR', 'WA'),
PARTITION east VALUES ('NY', 'CT'),
PARTITION cent VALUES ('IL', 'MN'));

Composite Partitioned
Table - By List And Range
CREATE TABLE composite_list_rng (
cust_id     NUMBER(10),
cust_name   VARCHAR2(25),
cust_state  VARCHAR2(2),
time_id     DATE)
PARTITION BY LIST(cust_state)
SUBPARTITION BY RANGE (cust_id)
SUBPARTITION TEMPLATE(
SUBPARTITION original VALUES LESS THAN (1001) TABLESPACE part1,
SUBPARTITION acquired VALUES LESS THAN (8001) TABLESPACE part2,
SUBPARTITION recent VALUES LESS THAN (MAXVALUE) TABLESPACE part3) (
PARTITION west VALUES ('OR', 'WA'),
PARTITION east VALUES ('NY', 'CT'),
PARTITION cent VALUES ('IL', 'MN'));
 
Compressed Partitions

Partition Level Compression
Need syntax diagram
CREATE TABLE sales (
saleskey    NUMBER,
quarter     NUMBER,
product     NUMBER,
salesperson NUMBER,
amount      NUMBER(12,2),
region      VARCHAR2(10)) COMPRESS
PARTITION BY LIST (region) (
PARTITION northwest VALUES ('NORTHWEST'),
PARTITION southwest VALUES ('SOUTHWEST'),
PARTITION northeast VALUES ('NORTHEAST') NOCOMPRESS,
PARTITION southeast VALUES ('SOUTHEAST'),
PARTITION western   VALUES ('WESTERN'));

SELECT table_name, tablespace_name, partitioned, compression
FROM user_tables;

SELECT partition_name, tablespace_name, high_value, compression
FROM user_tab_partitions;
 
Alter Table For Partitions

Moving Partitions

Not composite

ALTER TABLE <table_name>
MOVE PARTITION <partition_name>
TABLESPACE <tablespace_name>;
SELECT table_name, partition_name, tablespace_name
FROM user_tab_partitions;

ALTER TABLE hash_part
MOVE PARTITION sys_p26
TABLESPACE uwdata;

ALTER TABLE list_part
MOVE PARTITION q1_southcent
TABLESPACE uwdata NOLOGGING;

ALTER TABLE range_part
MOVE PARTITION yr0
TABLESPACE uwdata;

ALTER TABLE composite_rng_hash
MOVE PARTITION sales_pre98
TABLESPACE uwdata;

SELECT table_name, partition_name, tablespace_name
FROM user_tab_partitions;

Moving Subpartitions
ALTER TABLE <table_name>
MOVE SUBPARTITION <subpartition_name>
TABLESPACE <tablespace_name>;
SELECT partition_name, subpartition_name, tablespace_name
FROM user_tab_subpartitions
WHERE TABLE_NAME = 'COMPOSITE_RNG_HASH';

ALTER TABLE composite_rng_hash
MOVE SUBPARTITION sales_pre98_sp1
TABLESPACE uwdata
PARALLEL (DEGREE 2);

SELECT partition_name, subpartition_name, tablespace_name
FROM user_tab_subpartitions
WHERE TABLE_NAME = 'COMPOSITE_RNG_HASH';

Merging Subpartitions

List Only
ALTER TABLE <table_name>
MERGE SUBPARTITIONS <subpartition_name>
INTO SUBPARTITION <subpartition_name
TABLESPACE <tablespace_name>;
ALTER TABLE composite_rng_hash
MERGE SUBPARTITIONS sales_pre98_sp1, sales_pre98_sp2
INTO SUBPARTITION sales_pre98_sp12
TABLESPACE part1;

CREATE TABLE range_list (
cust_id     NUMBER(10),
channel_id  NUMBER(3),
amount_sold NUMBER(10,2),
time_id     DATE)
PARTITION BY RANGE(time_id)
SUBPARTITION BY LIST(channel_id)
SUBPARTITION TEMPLATE(
SUBPARTITION sp1 VALUES (2, 3) TABLESPACE part1,
SUBPARTITION sp2 VALUES (4, 5) TABLESPACE part2,
SUBPARTITION sp3 VALUES (6, 7) TABLESPACE part3,
SUBPARTITION sp4 VALUES (8, 9) TABLESPACE part4)
( PARTITION sp98
VALUES LESS THAN(TO_DATE('01/01/1998','DD/MM/YYYY')),
PARTITION s98
VALUES LESS THAN(TO_DATE('01/01/1999','DD/MM/YYYY')),
PARTITION s99
VALUES LESS THAN(TO_DATE('01/01/2000','DD/MM/YYYY')),
PARTITION s2K
VALUES LESS THAN(TO_DATE('01/01/2001','DD/MM/YYYY')),
PARTITION s01
VALUES LESS THAN(TO_DATE('01/01/2002','DD/MM/YYYY')),
PARTITION sf
VALUES LESS THAN(MAXVALUE));

col high_value format a20

SELECT partition_name, subpartition_name, tablespace_name, high_value
FROM user_tab_subpartitions
WHERE table_name = 'RANGE_LIST';

ALTER TABLE range_list
MERGE SUBPARTITIONS sp98_sp1, sp98_sp2 INTO SUBPARTITION sp12
PARALLEL (DEGREE 2)
TABLESPACE part1;

SELECT partition_name, subpartition_name, tablespace_name, high_value
FROM user_tab_subpartitions
WHERE table_name = 'RANGE_LIST';

Modify A Subpartition Template
ALTER TABLE <table_name>
SET SUBPARTITION TEMPLATE (
SUBPARTITION <subpartition_name>, TABLESPACE <tablespace_name>,
SUBPARTITION <subpartition_name>, TABLESPACE <tablespace_name>);
SELECT partition_name, subpartition_name, tablespace_name
FROM user_tab_subpartitions
WHERE table_name = 'RANGE_LIST';

ALTER TABLE range_list
SET SUBPARTITION TEMPLATE (
SUBPARTITION sp1 VALUES (2, 3) TABLESPACE part1,
SUBPARTITION sp2 VALUES (4, 5) TABLESPACE part2,
SUBPARTITION sp3 VALUES (6, 7) TABLESPACE part3,
SUBPARTITION sp4 VALUES (8, 9) TABLESPACE part4,
SUBPARTITION sp5 VALUES (0, 1) TABLESPACE uwdata);

col partition_name format a15
col high_value format a30

SELECT partition_name, subpartition_name, tablespace_name, high_value
FROM user_tab_subpartitions
WHERE table_name = 'RANGE_LIST';

ALTER TABLE range_list DROP PARTITION sf;

ALTER TABLE range_list
ADD PARTITION s02
VALUES LESS THAN(TO_DATE('01/01/2003','DD/MM/YYYY'));

ALTER TABLE range_list
ADD PARTITION sf
VALUES LESS THAN(MAXVALUE);

SELECT partition_name, subpartition_name, tablespace_name, high_value
FROM user_tab_subpartitions
WHERE table_name = 'RANGE_LIST';

set long 1000000
select dbms_metadata.get_ddl('TABLE', 'RANGE_LIST');

Change The Tablespace Name For A Future Partition
ALTER TABLE <table_name>
MODIFY DEFAULT ATTRIBUTES FOR PARTITION <partition_name>
TABLESPACE <tablespace_name>;
select partition_name, tablespace_name, high_value
from user_tab_partitions
where table_name = 'RANGE_LIST';

ALTER TABLE range_list
MODIFY DEFAULT ATTRIBUTES FOR PARTITION s98 TABLESPACE part1;

select partition_name, tablespace_name, high_value
from user_tab_partitions
where table_name = 'RANGE_LIST';

SELECT partition_name, subpartition_name, tablespace_name
FROM user_tab_subpartitions
WHERE table_name = 'RANGE_LIST';

Modify A List Partitioned List
ALTER TABLE <table_name>
MODIFY PARTITION <partition_name>
ADD VALUES (<values_list>);
SELECT partition_name, tablespace_name, high_value
FROM user_tab_partitions
WHERE table_name = 'LIST_PART';

ALTER TABLE list_part
MODIFY PARTITION q1_northcent
ADD VALUES ('MI', 'OH');

SELECT partition_name, tablespace_name, high_value
FROM user_tab_partitions
WHERE table_name = 'LIST_PART';

Drop Values From A List Partitioned List
ALTER TABLE <table_name>
MODIFY PARTITION <partition_name>
DROP VALUES (<values_list>);
ALTER TABLE list_part
MODIFY PARTITION q1_southwest
DROP VALUES ('NM');

SELECT partition_name, tablespace_name, high_value
FROM user_tab_partitions
WHERE table_name = 'LIST_PART';

Convert A Partition Into A Stand-alone Table
ALTER TABLE <table_name>
EXCHANGE PARTITION <partition_name>
WITH TABLE <new_table_name>
<including | excluding> INDEXES
<with | without> VALIDATION
EXCEPTIONS INTO <schema.table_name>;
SELECT table_name, partition_name, num_rows
FROM user_tab_partitions
WHERE table_name = 'LIST_PART';

CREATE TABLE q1_northwest AS
SELECT *
FROM list_part
WHERE 1=2;

SELECT * FROM list_part;

SELECT * FROM list_part PARTITION (q1_northwest);

ALTER TABLE list_part
EXCHANGE PARTITION q1_northwest WITH TABLE q1_northwest
INCLUDING INDEXES
WITHOUT VALIDATION
EXCEPTIONS INTO uwclass.problems;

SELECT * FROM q1_northwest;

SELECT * FROM list_part;

Convert A Stand-alone Table Into A Partition
CREATE TABLE range_part (
rid  NUMBER,
col1 VARCHAR2(10),
col2 VARCHAR2(100))
PARTITION BY RANGE(rid) (
partition p1 VALUES LESS THAN (1000),
partition p3 VALUES LESS THAN (3000),
partition pm VALUES LESS THAN (MAXVALUE));

CREATE TABLE new_part (
rid  NUMBER,
col1 VARCHAR2(10),
col2 VARCHAR2(100));

INSERT /*+ APPEND ORDERED FULL(s1) USE_NL(s2) */
INTO new_part
SELECT 3000 + TRUNC((rownum-1)/500,6), TO_CHAR(rownum), rpad('x',100)
FROM sys.source$ s1, sys.source$ s2
WHERE rownum <= 100000;

COMMIT;

SELECT COUNT(*) FROM range_part;
SELECT COUNT(*) FROM new_part;

col high_value format a20

SELECT table_name, partition_name, high_value
FROM user_tab_partitions;

set timing on

ALTER TABLE range_part
EXCHANGE PARTITION pm WITH TABLE new_part;

set timing off
DROP TABLE range_part PURGE;
DROP TABLE new_part PURGE;

-- recreate and populate tables

set timing on

ALTER TABLE range_part
EXCHANGE PARTITION pm WITH TABLE new_part
WITHOUT VALIDATION;

-- again drop the tables, recreate, and load them

-- add some realistic constraints

ALTER TABLE range_part
ADD CONSTRAINT pk_range_part
PRIMARY KEY(rid)
USING INDEX LOCAL;

ALTER TABLE new_part
ADD CONSTRAINT pk_new_part
PRIMARY KEY(rid)
USING INDEX;

set timing on

ALTER TABLE range_part
EXCHANGE PARTITION pm WITH TABLE new_part
INCLUDING INDEXES WITHOUT VALIDATION;

-- repeat again but this time do the following before the exchange
ALTER TABLE range_part MODIFY PRIMARY KEY NOVALIDATE;
ALTER TABLE new_part MODIFY PRIMARY KEY NOVALIDATE;

set timing on

ALTER TABLE range_part
EXCHANGE PARTITION pm WITH TABLE new_part
INCLUDING INDEXES WITHOUT VALIDATION;

Renaming A Partition
ALTER TABLE <table_name>
RENAME PARTITION <existing_partition_name>
TO <new_partition_name>;
SELECT table_name, partition_name
FROM user_tab_partitions;

ALTER TABLE range_list RENAME PARTITION sf TO sales_future;

SELECT table_name, partition_name
FROM user_tab_partitions;

Split Partition
ALTER TABLE <table_name>
SPLIT PARTITION <partition_name>
AT <range_definition>
INTO ( PARTITION <first_partition>, PARTITION <second_partition>)
UPDATE GLOBAL INDEXES;
SELECT table_name, partition_name, high_value
FROM user_tab_partitions
WHERE table_name = 'RANGE_PART';

INSERT INTO range_part VALUES (1, 1, 1, TO_DATE('01-JAN-1998'), 'A');
INSERT INTO range_part VALUES (1, 1, 1, TO_DATE('01-JAN-1999'), 'A');
INSERT INTO range_part VALUES (1, 1, 1, TO_DATE('01-JAN-2000'), 'A');
INSERT INTO range_part VALUES (1, 1, 1, TO_DATE('01-JAN-2001'), 'A');
INSERT INTO range_part VALUES (1, 1, 1, TO_DATE('15-MAR-2001'), 'A');
INSERT INTO range_part VALUES (1, 1, 1, TO_DATE('16-SEP-2001'), 'A');
INSERT INTO range_part VALUES (1, 1, 1, TO_DATE('20-DEC-2001'), 'A');
INSERT INTO range_part VALUES (1, 1, 1, TO_DATE('01-JAN-2002'), 'A');
INSERT INTO range_part VALUES (1, 1, 1, TO_DATE('01-JAN-2003'), 'A');
COMMIT;

col ph_comments format a10

SELECT * FROM range_part;

SELECT * FROM range_part PARTITION (yr2a);

ALTER TABLE range_part
SPLIT PARTITION yr2
AT (TO_DATE('30-JUN-2001','DD-MON-YYYY'))
INTO ( PARTITION yr2a, PARTITION yr2b)
UPDATE GLOBAL INDEXES;

SELECT * FROM range_part PARTITION (yr2a);
SELECT * FROM range_part PARTITION (yr2b);

SELECT table_name, partition_name, high_value
FROM user_tab_partitions
WHERE table_name = 'RANGE_PART';

Truncate A Partition
ALTER TABLE <table_name>
TRUNCATE PARTITION <partition_name>
DROP STORAGE;
SELECT * FROM range_part PARTITION (yr2b);

ALTER TABLE range_part
TRUNCATE PARTITION yr2b
DROP STORAGE;

SELECT * FROM range_part PARTITION (yr2b);

Split An LOB Partition
ALTER TABLE <table_name>
SPLIT PARTITION <partition_name> AT <split location> INTO
( PARTITION <new_partition_name> TABLESPACE <tablespace_name>"
LOB <column_name> STORE AS (TABLESPACE <tablespace_name>),
PARTITION <new_partition_name>
LOB (<column_name>) STORE AS (TABLESPACE <tablespace_name>);
ALTER TABLE print_media_part
SPLIT PARTITION p2 AT (150) INTO
( PARTITION p2a TABLESPACE omf_ts1
LOB ad_photo, ad_composite) STORE AS (TABLESPACE omf_ts2),
PARTITION p2b
LOB (ad_photo, ad_composite) STORE AS (TABLESPACE omf_ts2));

Add Partition And Specify BLOB/LOB Storage
ALTER TABLE <table_name>
ADD PARTITION <new_partition_name> VALUES LESS THAN (MAXVALUE)
LOB (<column_name>) STORE AS (TABLESPACE <tablespace_name);
ALTER TABLE print_media_part
ADD PARTITION p3 VALUES LESS THAN (MAXVALUE)
LOB (ad_photo, ad_composite) STORE AS (TABLESPACE omf_ts2)
LOB (ad_sourcetext, ad_finaltext) STORE AS (TABLESPACE omf_ts1);
 
Index Partitions

Global Index Creation
CREATE INDEX <index_name>
ON <table_name> <column_name_list>;
SELECT i.index_name, i.composite, i.partition_name, i.high_value
FROM user_ind_partitions i, user_tab_partitions t
WHERE i.partition_name = t.partition_name
AND t.table_name = 'RANGE_PART';

SELECT partition_name
FROM user_tab_partitions
WHERE table_name = 'RANGE_PART';

CREATE INDEX gi_range_part_person_id
ON range_part (person_id);

SELECT index_name, partitioned
FROM user_indexes
WHERE table_name = 'RANGE_PART';

DROP INDEX gi_range_part_person_id;

Local Index Creation and Partition Pruning Demo
CREATE INDEX <index_name>
ON <table_name> <column_name_list> LOCAL;
CREATE INDEX li_range_part_person_id
ON range_part (person_id)
LOCAL;

SELECT index_name, partitioned
FROM user_indexes
WHERE table_name = 'RANGE_PART';

SELECT ip.index_name, ip.composite, ip.partition_name, ip.high_value
FROM user_ind_partitions ip, user_indexes ui
WHERE ip.index_name = ui.index_name
AND ui.table_name = 'RANGE_PART';

DROP INDEX li_range_part_person_id;

CREATE INDEX li_range_part_person_id
ON range_part (person_id)
LOCAL (
PARTITION yr0  TABLESPACE part1,
PARTITION yr1  TABLESPACE part2,
PARTITION yr2a  TABLESPACE part3,
PARTITION yr2b TABLESPACE part4,
PARTITION yr9  TABLESPACE uwdata);

col tablespace_name format a15

SELECT ip.index_name, ip.partition_name, ip.tablespace_name, ip.high_value
FROM user_ind_partitions ip, user_indexes ui
WHERE ip.index_name = ui.index_name
AND ui.table_name = 'RANGE_PART';

SELECT * FROM range_part;

SELECT * FROM range_part PARTITION (yr2a);

EXPLAIN PLAN FOR
SELECT *
FROM range_part
WHERE record_date BETWEEN TO_DATE('01-JAN-1998') AND TO_DATE('31-JAN-1998');

SELECT * FROM TABLE(dbms_xplan.display);

EXPLAIN PLAN FOR
SELECT *
FROM range_part
WHERE record_date BETWEEN TO_DATE('01-JAN-1998') AND TO_DATE('31-DEC-2000');

SELECT * FROM TABLE(dbms_xplan.display);

EXPLAIN PLAN FOR
SELECT *
FROM range_part
WHERE record_date BETWEEN TO_DATE('01-JAN-1999') AND TO_DATE('31-DEC-2002');

SELECT * FROM TABLE(dbms_xplan.display);

Global Partition Index Creation
CREATE INDEX <index_name>
ON <table_name> <column_name_list>
GLOBAL PARTITION BY RANGE (partition_column_name_list) (
PARTITION <partition_name> VALUES <condition>);
DROP INDEX li_range_part_person_id;

UPDATE range_part
SET organization_id = ROWNUM;

col ph_comments format a15

SELECT * FROM range_part;

CREATE INDEX gi_range_part_person_id
ON range_part (organization_id)
GLOBAL PARTITION BY RANGE(organization_id) (
PARTITION p1 VALUES LESS THAN(4)
TABLESPACE part1,
PARTITION p2 VALUES LESS THAN(MAXVALUE)
TABLESPACE part2);

col high_value format a20

SELECT ip.index_name, ip.partition_name, ip.tablespace_name, ip.high_value
FROM user_ind_partitions ip, user_indexes ui
WHERE ip.index_name = ui.index_name
AND ui.table_name = 'RANGE_PART';
Query for Unusable Indexes SELECT index_name, partition_name, status
FROM user_ind_partitions;
 
Alter Table and Index For Partitions

Rebuild Local All Local Indexes On A Table
ALTER TABLE <table_name>
MODIFY PARTITION <partition_name>
REBUILD UNUSABLE LOCAL INDEXES;
CREATE INDEX li_range_part_person_id
ON range_part (person_id)
LOCAL;

SELECT t.table_name, i.index_name, i.partition_name, i.status
FROM user_ind_partitions i, user_tab_partitions t
WHERE i.partition_name = t.partition_name;

ALTER TABLE range_part
MODIFY PARTITION yr0
REBUILD UNUSABLE LOCAL INDEXES;

Rebuild any unusable local index partitions associated with a hash partition at the specific composite partitioned table subpartition level
ALTER TABLE <table_name>
MODIFY SUBPARTITION <subpartition_name>
REBUILD UNUSABLE LOCAL INDEXES;
SELECT i.table_name, s.index_name, s.partition_name, s.status
FROM user_ind_subpartitions s, user_indexes i
WHERE s.index_name = i.index_name;

ALTER TABLE
composite_rng_hash
MODIFY SUBPARTITION sales_1999_sp4
REBUILD UNUSABLE LOCAL INDEXES;

Rebuild (and move) a local partition index
ALTER INDEX <index_name>
REBUILD PARTITION <partition_name>
TABLESPACE <new_tablespace_name>;
col partition_name format a10
col tablespace_name format a20

SELECT i.table_name, s.index_name, s.tablespace_name, s.partition_name, s.status
FROM user_ind_partitions s, user_indexes i
WHERE s.index_name = i.index_name;

ALTER INDEX
li_range_part_person_id
REBUILD PARTITION yr2
TABLESPACE uwdata;

SELECT i.table_name, s.index_name, s.tablespace_name, s.partition_name, s.status
FROM user_ind_partitions s, user_indexes i
WHERE s.index_name = i.index_name;
 
Drop Partition
Drop Partition ALTER TABLE DROP PARTITION <partition_name> [ UPDATE GLOBAL INDEXES];
SELECT table_name, partition_name
FROM user_tab_partitions;

ALTER TABLE range_list DROP PARTITION s2k UPDATE GLOBAL INDEXES;
 
Demos

Partition Elimination
conn scott/tiger

-- Create a list partitioned table
CREATE TABLE partdemo (
empno    NUMBER(4) NOT NULL,
ename    VARCHAR2(10),
job      VARCHAR2(9),
mgr      NUMBER(4),
hiredate DATE,
sal      NUMBER(7, 2),
comm     NUMBER(7, 2),
deptno   NUMBER(2))
partition by list(deptno)(
partition p1 values (10,30) tablespace uwdata,
partition p2 values (20,40) tablespace example);

INSERT INTO partdemo SELECT * FROM scott.emp;

set linesize 121

SELECT * FROM partdemo;

SELECT * FROM partdemo PARTITION (p1);

SELECT * FROM partdemo PARTITION (p2);

-- Take the example tablespace OFFLINE to examine partition elimination
conn / as sysdba

ALTER TABLESPACE example OFFLINE;

conn scott/tiger

SELECT COUNT(*) FROM partdemo;
SELECT COUNT(*) FROM partdemo WHERE deptno = 10;
SELECT COUNT(*) FROM partdemo WHERE deptno BETWEEN 1 AND 19;
SELECT COUNT(*) FROM partdemo WHERE deptno BETWEEN 1 AND 20;
SELECT COUNT(*) FROM partdemo WHERE deptno IN(10,30);

conn / as sysdba

ALTER TABLESPACE example ONLINE;
 
Undocumented Partitioning

Found by Jonathan Lewis and noted here
SELECT DISTINCT TBL$OR$IDX$PART$NUM(BBUKDW.VISIT_TX, 0, CALENDAR_DT)
FROM (
  SELECT D.CALENDAR_DT CALENDAR_DT
  FROM BBUKDW.JPL_DAY D
  WHERE D.FINANCIAL_WEEK_ID>=200218
  AND D.FINANCIAL_WEEK_ID <=200222)
ORDER BY 1;
 
Related Topics
DBMS_PCLXUTIL
DBMS_STATS
Indexes
Tables
Truncate
Update
 
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