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Oracle Partitioning -- A Primer
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Partitioning
Partitioning is the ability of the database to take very large tables or indexes and
physically break them into
smaller
manageable pieces.
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Partitioned VS Non Partitioned Table
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Partitions - Benefits
Large Table
Difficult to Manage
Partition
Divide and Conquer
Easier to Manage
Improve Performance
Composite Partition
Better Performance
More flexibility to match business needs
JAN FEB
USA
EUROPE
ORDERS
Transparent to applications
ORDERS
JAN FEB
ORDERS
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Partitioning - Benefits
Faster
• Queries will access only those relevant partitions
Cheaper
• An entire partition can be exported• Exported partition can be deleted from
database
Flexible
• Partition Maintenance is simpler when compared to a large un-partitioned table
• Partition backup/restoration is easier
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When To Partition - Table
Here are some suggestions for when to partition a table:
Tables greater than 2 GB should always be considered as candidates for partitioning.
Tables containing historical data, in which new data is added into the newest partition.
A typical example is a historical table where only the current month's data is updatable and the other 11 months are read only.
When the contents of a table need to be distributed across different types of storage devices.
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Partition Strategies
Range Hash List Composite
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Partition Type .. (Examples)
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Range Partitioned Tables
• Data distribution is based on range of values• Data distribution is continuous• Best performance when data distribution is
even on the partition key.• Knowledge of data is critical before choosing
this
Definition
• Date as partitioning key Jan 2011, Feb 2011, Mar 2011 so on..
• Department code as partitioning key Values <= 30, Values > 30
Example
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DDL Example …
CREATE TABLE DEPT (
DEPTNO NUMBER (2),
DEPT_NAME VARCHAR2 (30))
PARTITION BY RANGE (DEPTNO)
(
PARTITION D1 VALUES LESS THAN (10) TABLESPACE DEPT1,
PARTITION D2 VALUES LESS THAN (20) TABLESPACE DEPT2,
PARTITION D1 VALUES LESS THAN (MAXVALUE) TABLESPACE DEPT3
)
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Range Partition (Multi column)
• Defined on two or more columns of the table
Multi Column Range Partition
• Enhances Query performance if searched on partition key
• Improves the Manageability of partitions
Advantages
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When to use Range Partition
Very large tables being scanned on a
range predicate like
Order-Date
Need to maintain rolling window of
data
Very less time for
administrative operations
like backup on large tables
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Hash PartitioningP
art
itio
n K
ey
Specify the number of partitions
Alw
ays D
efi
ne
2n
Part
itio
ns
Oracle database inserts rows based on hash value of partition key
Sto
rag
e
Specify storage for the entire table and the tablespace for partitions
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Hash Partition – Example
Hash-partitioned table that splits the table into four parts based on the hash of the partition key, acct_no.
CREATE TABLE CUST_SALES_HASH (
ACCT_NO NUMBER (5),
CUST_NAME CHAR (30))
PARTITION BY HASH (ACCT_NO) PARTITIONS 4
STORE IN (USERS1, USERS2, USERS3, USERS4);
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When to use Hash Partition
Improve Manageability/availabilit
y of Large tables
Avoid data skew in partitions
Maximize I/0 throughput
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List Partitioning
• Segmenting data with a list of values
• Flexible means of partitioning where data is better
understood
• Similar to Range Partitioning, but without any max
value
Definition
• CREATE TABLE DEPT_PART (DEPTNO NUMBER (2),DNAME VARCHAR2
(14),LOC VARCHAR2 (13))
PARTITION BY LIST (DNAME)
(PARTITION
D1_EAST VALUES (‘NEW YORK’),
PARTITION D2_WEST VALUES (‘SAN FRANCISCO’, ‘LOS ANGELES’),
PARTITION D3_SOUTH VALUES (‘ATLANTA’,’DALLAS’,’HOUSTON’),
PARTITION D4_NORTH VALUES (‘CHICAGO’,’DETROIT’));
Example
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Range ,List , Hash Partitions
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Composite Partitioning
Data is Partitioned along two
dimensions
A distinct value pair for
the two dimensions
uniquely determines the target partition
Composite Partitioning
is complementa
ry to multi column range
partition
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Composite Partitioning Strategies
New 11g Strategy Use Case
List – Range Geography –Time
Range - Range Ship Date – Order Date
List - Hash Geography – OrderID
List - List Geography – Product
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Range – List Partitioning
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Composite PartitioningRange - Range
Jan 2006
... ...
Feb 2006 Mar 2006 Jan 2007
... ...
... ...
...
...
...
...
Jan 2006
Feb 2006
May 2006
Mar 2006
• All records with order_date in March 2006 ANDship_date in May 2006
May2006
ship_date
order_date
Table SALESRANGE(order_date)-RANGE(ship_date)
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