Post on 19-May-2015
description
transcript
Partitioning and Archiving
Bala Prabahar
BAPS Software Consulting Services Inc.
07/15/2011
2
1. What is Partitioning?
2. Types of Partitioning
3. How to Implement?
4. Global Versus Local Index
5. Questions
3
Partitioning enables tables and indexes to be
subdivided into smaller manageable pieces
Each of those smaller pieces is called Partition.
10 Partitions with ~10m records
5
Available Partitioning Types:
Range Partitioning (introduced in Oracle 8)
Hash Partitioning (introduced in Oracle 8i)
Composite Partitioning (introduced in Oracle 8i)
List Partitioning (introduced in Oracle 9i)
Interval Partitioning (introduced in Oracle 11g)
System Partitioning (introduced in Oracle 11g)
Reference Partitioning (introduced in Oracle 11g)
Range-hash partitioning was introduced in Oracle 8i
Range-list partitioning was introduced in Oracle 9i
Range-range partitioning was introduced in Oracle 11g
List-range partitioning was introduced in Oracle 11g
List-hash partitioning was introduced in Oracle 11g
List-list partitioning was introduced in Oracle 11g
Interval-range partitioning was introduced in Oracle 11g
Interval-list partitioning was introduced in Oracle 11g
Interval-hash partitioning was introduced in Oracle 11g
7
Available Partitioning Types:
Range Partitioning (introduced in Oracle 8)
Hash Partitioning (introduced in Oracle 8i)
Composite Partitioning (introduced in Oracle 8i)
List Partitioning (introduced in Oracle 9i)
Interval Partitioning (introduced in Oracle 11g)
System Partitioning (introduced in Oracle 11g)
Reference Partitioning (introduced in Oracle 11g)
Interval partitioning is a partitioning method introduced in Oracle 11g. This is a helpful addition to range partitioning where Oracle automatically creates a partition when the inserted value
exceeds all other partition ranges.
The following restrictions apply:
You can only specify one partitioning key column, and it must be of NUMBER or DATE type.
Interval partitioning is NOT supported for index-organized tables.
You can NOT create a domain index on an interval-partitioned table.
84
2
7
5
6
1 Identify Tables
3
Discuss with Business
Run SQL Statement
Group BY &
Order BY
Determine Partition Key
Determine # of Partitions
Run a Script to identify the
Upper Key Limit
Generate CREATE TABLE
Statement
Load data into Partitioned Table
10
• SELECT <KEY_1>,<KEY_2> …<KEY_N>, Count(*)
• FROM <TABLE>
• GROUP BY <KEY_1>, <KEY_2>,<KEY_3>
• ORDER BY <KEY_1>, <KEY_2>,<KEY_3>
11
• ODSR_4IN68CVTKN5HWSCTCM8G03ZIQ 541332
• ODSR_4IPWDLN3A0E9ZQL9C715GI9W1 65351
• ODSR_4IQPKCK3V2L00HG22IF07LF2P 86676
• ODSR_4ITGFBK0J0DFFDYVSFXFAN05U 55170
• ODSR_4IV1M2YUQGVGUIQ4KHQ06WXAP 53280
• ODSR_4IVFQZCVDSWY1PPK0MXC06SNL 67820
• ODSR_4IXS9V5HSV12YA22KWXUV0FPU 47570
• ODSR_4J2627MWPQSEMKEN3SCD6BKIA 49048
• ODSR_4J32BJFV6AV8GCQCX6NEUY5JM 18109
• ODSR_4J4JFJQKSZPTDIM9Z2DVE9ZMA 58148
• ODSR_4J9OGSBOLT2YN8BA0V0EVJHJM 67760
84
2
7
5
6
1 Identify Tables
3
Discuss with Business
Run SQL Statement
Group BY &
Order BY
Determine Partition Key
Determine # of Partitions
Run a Script to identify the
Upper Key Limit
Generate CREATE TABLE
Statement
Load data into Partitioned Table
13
14
84
2
7
5
6
1 Identify Tables
3
Discuss with Business
Run SQL Statement
Group BY &
Order BY
Determine Partition Key
Determine # of Partitions
Run a Script to identify the
Upper Key Limit
Generate CREATE TABLE
Statement
Load data into Partitioned Table
16
CREATE TABLE "/BIC/B0000252000_NEW"
PARTITION BY RANGE
("REQUEST") (PARTITION P1 VALUES LESS THAN
('ODSR_4IR2HPAGY9GBAE2NNIO2BQJ6A')
PCTFREE 10 PCTUSED 40 INITRANS 1
MAXTRANS 255 STORAGE(INITIAL 30M NEXT 1048576 MINEXTENTS 1
FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
TABLESPACE "PSAPSR3FACT",
84
2
7
5
6
1 Identify Tables
3
Discuss with Business
Run SQL Statement
Group BY &
Order BY
Determine Partition Key
Determine # of Partitions
Run a Script to identify the
Upper Key Limit
Generate CREATE TABLE
Statement
Load data into Partitioned Table
18
19
Global
Local
20
Multi-providers
Cubes – Further levels of Partitioning
21
Drop Partition instead of Deleting Records
Benefits:
Old records are not mixed with new records.
Dropping partition will be faster
22