Most VLDBs should use partitioning and in today’s world scaling up and out a database is something critical, so every DBA and Developer should work together to accomplish this task. Partitioning may help the application run faster and also helps DBAs to perform their work.

1. 1© The Pythian Group Inc., 2018
Franky Weber Faust
September 2019
WHY, WHEN AND HOW TO DO IT
ORACLE
PARTITIONING FOR
DBAS AND
DEVELOPERS

2. 2© The Pythian Group Inc., 2018 2
FRANKY WEBER FAUST
● Senior Oracle Database Consultant at Pythian
● 28 years old
● Writer at OTNLA and Lore Data Blog
● Speaker at conferences around the world
● High Availability specialist
● Performance researcher
● Exadata, RAC, DataGuard, GoldenGate
● AcroYoga practitioner
● Guitar player
loredata.com.br

3. 3© The Pythian Group Inc., 2018 3
E-mail: faust@pythian.com or franky@loredata.com.br
Blog: http://loredata.com.br/blog
Facebook: https://facebook.com/08Franky.Weber
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Keep in touch

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Years in Business
20 Pythian Experts
in 35 Countries
400+ Current Clients
Globally
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WHY THIS PRESENTATION?

7. 7© The Pythian Group Inc., 2018
AGENDA
7
● Partitioning concept
● Background
● Partitioning benefits (Why)
● Implementation scenarios (When)
● Types of partitioning (When)
● Range, List, Interval e Hash partitioning (How)
● The execution plan

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PARTITIONING CONCEPTS
● Break down a table/index into
smaller pieces
● Partition Key
● Single or multicolumn
● Up to 16 columns
● Unique values are not required
● Every partition is a segment
● Tables
● Heap tables
● Index-organized tables
● Indexes
● Materialized Views
● Clusters
● Performance
● Partition Pruning

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BACKGROUND HISTORY
● Since Oracle 8 (1997)
● Requires extra licensing and EE
● Manual partitioning using views
● New features every new release
● 19c Hybrid partitioning (Hive, HDFS,
External file)
Partition Maintenance on multiple
partitions, Asynchronous global
index maintenance, Zone maps
Oracle 12cR2
Table creation for partition
exchange, read-only partitions,
Filtered partition maintenance,
Online table conversion to
partitioned table
Oracle 18c Online Merging of Partitions
and Subpartitions
Parallel Partition-Wise
SQL Operations
Modifying the Partitioning
Strategy
Auto-list and Multicolumn list
partitioning, Partitioned
external tables

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PARTITIONING BENEFITS (WHY)
● Increases availability of data
● Eases administration of large
segments
● Might improve the performance of
some queries
● Might reduce contention on hot
OLTP segments

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IMPLEMENTATION SCENARIOS (WHEN)
● Large volume of data when
administration becomes difficult
● Query performance on large tables
suffers
● Buffer busy waits on high-concurrent
tables
● Horizontal scalability in RAC
● Decreased storage cost
● Compression and row archival

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TYPES OF PARTITIONING (HOW)
● Range Partitioning
● Dates and numbers are good
candidates
● Upper boundary
● Hash Partitioning
● High-volume OLTP segments
● Data is evenly distributed across
partitions
● List Partitioning
● Categories, colors, sports, brands
● Default values accepted
● Interval Partitioning
● Automated range partitions
● Reference Partitioning
● Relational model PK-FK
● Interval Reference Partitioning
● All child tables will be automatically
maintained
● Virtual Column Based Partitioning
● *Hybrid Partitioning (19c)*

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RANGE PARTITIONING (HOW)

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RANGE PARTITIONING (HOW)

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LIST PARTITIONING (HOW)

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LIST PARTITIONING (HOW)

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HASH PARTITIONING (HOW)

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HASH PARTITIONING (HOW)

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HASH PARTITIONING (HOW)

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HASH PARTITIONING (HOW)

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HASH PARTITIONING (HOW)

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HASH PARTITIONING (HOW)

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HASH PARTITIONING (HOW)

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HASH PARTITIONING (HOW)

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HASH PARTITIONING (HOW)

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HASH PARTITIONING (HOW)

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HASH PARTITIONING (HOW)

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INTERVAL PARTITIONING (HOW)

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INTERVAL PARTITIONING (HOW)

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INTERVAL PARTITIONING (HOW)

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INTERVAL PARTITIONING (HOW)

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INTERVAL PARTITIONING (HOW)

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THE EXECUTION PLAN

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THE EXECUTION PLAN

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THE EXECUTION PLAN

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THE EXECUTION PLAN

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THE EXECUTION PLAN

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THE EXECUTION PLAN

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THE EXECUTION PLAN

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THE EXECUTION PLAN

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THE EXECUTION PLAN

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THE EXECUTION PLAN

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THE EXECUTION PLAN

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THE EXECUTION PLAN

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THE EXECUTION PLAN

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THE EXECUTION PLAN

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PARTITIONING MAINTENANCE OPERATIONS
online

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PARTITIONING MAINTENANCE OPERATIONS

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PARTITIONING MAINTENANCE OPERATIONS
online

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CONCLUSION
● Range Partitioning, Hash
Partitioning, List Partitioning, Interval
Partitioning
● 12cR2 onwards can perform most
partitioning operations online
● Performance problems in read or
write operations can get better or
worse with partitioning, so plan well
● New releases -> New features, it's
been like that for years.
● Questions?

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Stay in touch!
● E-mail: franky@loredata.com.br or faust@pythian.com
● Blog: http://loredata.com.br/blog
● Facebook: https://facebook.com/08Franky.Weber
● Instagram: https://www.instagram.com/frankyweber/
● Twitter: https://twitter.com/frankyweber
● LinkedIn: https://linkedin.com/in/frankyweber/en
● Oracle ACE: https://bit.ly/2YxU6bK

52. © The Pythian Group Inc., 2018 5252© The Pythian Group Inc., 2018