18
Thu, Apr
5 New Articles
  1. You are here:  
  2. Home
  3. Analytics & Cognitive
  4. DB2
  5. TechTip: How to Use the Multi-Temperature Storage Feature in DB2

TechTip: How to Use the Multi-Temperature Storage Feature in DB2

Typography
  • Smaller Small Medium Big Bigger
  • Default Helvetica Segoe Georgia Times

Is your data hot, warm, or cold?

 

Editor's note: This article is an excerpt from the book DB2 10.1/10.5 for Linux, UNIX, and Windows Database Administration (Exams 611 and 311): Certification Study Guide.

 

The amount of data stored in enterprise data warehouse environments is growing at an exponential rate. At the same time, the end-user experience expectations are getting higher and higher. The challenge here is to store enormous amount of data without impacting application query performance and storage costs.

 

With DB2 10.1, you can classify the data warehouse data according to its temperature—Hot, Warm, or Cold. The temperature of the data is decided based on these factors:

  • How often the data is accessed
  • How critical the performance of the queries that access the data is
  • How old the data is

 

You can configure the database so that frequently accessed data is stored on fast storage such as SSD drives, infrequently accessed data is stored on slightly slower storage such as SAS drives, and rarely accessed data is stored on slow storage such as SATA drives, as in the figure below.

 

 092515MohanFig1

 

This feature reduces storage costs because not all data is required to be stored on fast, expensive drives. It also helps achieve better end-user experience due to the ability to store recent data on fast drives.

 

The following steps provide more information about how to implement multi-temperature data storage for the sales data in the current financial year:

 

Step 1: Create three storage groups: SG_HOT to store frequently access data, SG_WARM to store infrequently accessed data, and SG_COLD to store occasionally accessed data:

 

CREATE STOGROUP SG_HOT ON '/data/hot/fs1' OVERHEAD 0.825

DEVICE READ RATE 512 DATA TAG 1

DB20000I The SQL command completed successfully.

 

CREATE STOGROUP SG_WARM ON '/data/warm/fs1' OVERHEAD 6.725

DEVICE READ RATE 100 DATA TAG 2

DB20000I The SQL command completed successfully.

 

CREATE STOGROUP SG_COLD ON '/data/cold/fs1' OVERHEAD 7.525

DEVICE READ RATE 70 DATA TAG 3

DB20000I The SQL command completed successfully.

 

 

Step 2: Create four table spaces to store quarter data and assign it to each respective storage group:

 

CREATE TABLESPACE TBSP3 USING STOGROUP SG_HOT

DB20000I The SQL command completed successfully.

 

CREATE TABLESPACE TBSP2 USING STOGROUP SG_WARM

DB20000I The SQL command completed successfully.

 

CREATE TABLESPACE TBSP1 USING STOGROUP SG_COLD

DB20000I The SQL command completed successfully.

 

CREATE TABLESPACE TBSP0 USING STOGROUP SG_COLD

DB20000I The SQL command completed successfully.

 

Step 3: Create a range partitioned table to store sales data based on the date:

 

CREATE TABLE SALES

(SALES_DATE DATE,

SALES_AMOUNT NUMERIC (5, 2))

IN TBSP0, TBSP1, TBSP2, TBSP3

PARTITION BY RANGE (SALES_DATE NULLS FIRST)

(STARTING '1/1/2014' ENDING '12/31/2014' EVERY 3 MONTHS)

DB20000I The SQL command completed successfully.

 

In the above example, 2014 Q1 data is stored in table space TBSP0, 2014 Q2 data in table space TBSP1, 2014 Q3 data in table space TBSP2, and 2014 Q4 data in table space TBSP3. You can also verify the storage allocation by executing the DESCRIBE DATA PARTITIONS command:

 

DESCRIBE DATA PARTITIONS FOR TABLE sales SHOW DETAIL

PartitionId PartitionName TableSpId PartObjId IndexTblSpId LongTblSpId AccessMode Status

----------- ------------- --------- --------- ------------ ----------- ---------- ------

0          PART0       5        4        5           5           F

1          PART1       7        4        7           7           F

2          PART2       8        4        8           8           F

3          PART3       9        4      9           9           F

4 record(s) selected.

 

PartitionId Inclusive (y/n) Inclusive (y/n)

Low Value High Value

----------- - ------------------------------- - --------------------------

0 Y '2014-01-01' N '2014-04-01'

1 Y '2014-04-01' N '2014-07-01'

2 Y '2014-07-01' N '2014-10-01'

3 Y '2014-10-01' Y '2014-12-31'

4 record(s) selected.

 

 

Step 4: Re-adjust the temperature. At some point, new data for 2015 Q1 will be loaded into the database, which will take the higher priority for performance reasons. You can then associate the table space TBSP2 with the storage group SG_COLD and table space TBSP3 with the storage group SG_WARM, keeping the new table space TBSP4 on the fastest storage group—SG_HOT. To move the table spaces online from one storage group to another, use the ALTER TABLESPACE command. The set of commands look something like this:

 

CREATE TABLESPACE TBSP4 USING STOGROUP SG_HOT

DB20000I The SQL command completed successfully.

 

ALTER TABLE sales ADD PARTITION "PART4"

STARTING FROM ('2015-01-01') ENDING AT ('2015-04-01')

IN TBSP4 INDEX IN TBSP4

DB20000I The SQL command completed successfully.

 

ALTER TABLESPACE TBSP2 USING STOGROUP SG_COLD

DB20000I The SQL command completed successfully.

 

ALTER TABLESPACE TBSP3 USING STOGROUP SG_WARM

DB20000I The SQL command completed successfully.

 

Learn more with the book DB2 10.1/10.5 for Linux, UNIX, and Windows Database Administration (Exams 611 and 311): Certification Study Guide.

 

Mohankumar Saraswatipura

Mohankumar (Mohan) Saraswatipura works as a database solutions architect at Kronsys, Inc., focusing on IBM DB2, Linux, UNIX, and Windows solutions. Prior to his current position, he worked as a database solutions architect at Reckitt Benckiser Group, plc (UK), focusing on IBM Smart Analytics System 5600, Siebel, SQL Server, and SAP HANA solutions. 

Mohan is an IBM Champion (2010–2015) and a DB2’s Got Talent 2013 winner. He has written dozens of technical papers for IBM developerWorks and IBM Data magazine. He is an IBM-Certified DB2 Advanced Database Administrator, DB2 Application Developer, and DB2 Problem Determination Master. Mohan holds a Master’s of Technology (M Tech) degree in computer science and an Executive MBA (IT).

MC Press books written by Mohankumar Saraswatipura available now on the MC Press Bookstore.

DB2 10.1/10.5 for Linux, UNIX, and Windows Database Administration (Exams 611 and 311) DB2 10.1/10.5 for Linux, UNIX, and Windows Database Administration (Exams 611 and 311)
Master DB2 database administration and prepare for IBM's Exams 611 and 311: Certified Database Administrator.
List Price $134.95

Now On Sale

BLOG COMMENTS POWERED BY DISQUS

LATEST COMMENTS

Support MC Press Online

$0.00 Raised:
$

Book Reviews

Resource Center

  • SB Profound WC 5536 Have you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application. You can find Part 1 here. In Part 2 of our free Node.js Webinar Series, Brian May teaches you the different tooling options available for writing code, debugging, and using Git for version control. Brian will briefly discuss the different tools available, and demonstrate his preferred setup for Node development on IBM i or any platform. Attend this webinar to learn:

  • SB Profound WP 5539More than ever, there is a demand for IT to deliver innovation. Your IBM i has been an essential part of your business operations for years. However, your organization may struggle to maintain the current system and implement new projects. The thousands of customers we've worked with and surveyed state that expectations regarding the digital footprint and vision of the company are not aligned with the current IT environment.

  • SB HelpSystems ROBOT Generic IBM announced the E1080 servers using the latest Power10 processor in September 2021. The most powerful processor from IBM to date, Power10 is designed to handle the demands of doing business in today’s high-tech atmosphere, including running cloud applications, supporting big data, and managing AI workloads. But what does Power10 mean for your data center? In this recorded webinar, IBMers Dan Sundt and Dylan Boday join IBM Power Champion Tom Huntington for a discussion on why Power10 technology is the right strategic investment if you run IBM i, AIX, or Linux. In this action-packed hour, Tom will share trends from the IBM i and AIX user communities while Dan and Dylan dive into the tech specs for key hardware, including:

  • Magic MarkTRY the one package that solves all your document design and printing challenges on all your platforms. Produce bar code labels, electronic forms, ad hoc reports, and RFID tags – without programming! MarkMagic is the only document design and print solution that combines report writing, WYSIWYG label and forms design, and conditional printing in one integrated product. Make sure your data survives when catastrophe hits. Request your trial now!  Request Now.

  • SB HelpSystems ROBOT GenericForms of ransomware has been around for over 30 years, and with more and more organizations suffering attacks each year, it continues to endure. What has made ransomware such a durable threat and what is the best way to combat it? In order to prevent ransomware, organizations must first understand how it works.

  • SB HelpSystems ROBOT GenericIT security is a top priority for businesses around the world, but most IBM i pros don’t know where to begin—and most cybersecurity experts don’t know IBM i. In this session, Robin Tatam explores the business impact of lax IBM i security, the top vulnerabilities putting IBM i at risk, and the steps you can take to protect your organization. If you’re looking to avoid unexpected downtime or corrupted data, you don’t want to miss this session.

  • SB HelpSystems ROBOT GenericCan you trust all of your users all of the time? A typical end user receives 16 malicious emails each month, but only 17 percent of these phishing campaigns are reported to IT. Once an attack is underway, most organizations won’t discover the breach until six months later. A staggering amount of damage can occur in that time. Despite these risks, 93 percent of organizations are leaving their IBM i systems vulnerable to cybercrime. In this on-demand webinar, IBM i security experts Robin Tatam and Sandi Moore will reveal:

  • FORTRA Disaster protection is vital to every business. Yet, it often consists of patched together procedures that are prone to error. From automatic backups to data encryption to media management, Robot automates the routine (yet often complex) tasks of iSeries backup and recovery, saving you time and money and making the process safer and more reliable. Automate your backups with the Robot Backup and Recovery Solution. Key features include:

  • FORTRAManaging messages on your IBM i can be more than a full-time job if you have to do it manually. Messages need a response and resources must be monitored—often over multiple systems and across platforms. How can you be sure you won’t miss important system events? Automate your message center with the Robot Message Management Solution. Key features include:

  • FORTRAThe thought of printing, distributing, and storing iSeries reports manually may reduce you to tears. Paper and labor costs associated with report generation can spiral out of control. Mountains of paper threaten to swamp your files. Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing. Manage your reports with the Robot Report Management Solution. Key features include:

  • FORTRAFor over 30 years, Robot has been a leader in systems management for IBM i. With batch job creation and scheduling at its core, the Robot Job Scheduling Solution reduces the opportunity for human error and helps you maintain service levels, automating even the biggest, most complex runbooks. Manage your job schedule with the Robot Job Scheduling Solution. Key features include:

  • LANSA Business users want new applications now. Market and regulatory pressures require faster application updates and delivery into production. Your IBM i developers may be approaching retirement, and you see no sure way to fill their positions with experienced developers. In addition, you may be caught between maintaining your existing applications and the uncertainty of moving to something new.

  • LANSAWhen it comes to creating your business applications, there are hundreds of coding platforms and programming languages to choose from. These options range from very complex traditional programming languages to Low-Code platforms where sometimes no traditional coding experience is needed. Download our whitepaper, The Power of Writing Code in a Low-Code Solution, and:

  • LANSASupply Chain is becoming increasingly complex and unpredictable. From raw materials for manufacturing to food supply chains, the journey from source to production to delivery to consumers is marred with inefficiencies, manual processes, shortages, recalls, counterfeits, and scandals. In this webinar, we discuss how:

  • The MC Resource Centers bring you the widest selection of white papers, trial software, and on-demand webcasts for you to choose from. >> Review the list of White Papers, Trial Software or On-Demand Webcast at the MC Press Resource Center. >> Add the items to yru Cart and complet he checkout process and submit

  • Profound Logic Have you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application.

  • SB Profound WC 5536Join us for this hour-long webcast that will explore:

  • Fortra IT managers hoping to find new IBM i talent are discovering that the pool of experienced RPG programmers and operators or administrators with intimate knowledge of the operating system and the applications that run on it is small. This begs the question: How will you manage the platform that supports such a big part of your business? This guide offers strategies and software suggestions to help you plan IT staffing and resources and smooth the transition after your AS/400 talent retires. Read on to learn: