Improving Performance with SETOBJACC

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Brief: There are many ways to improve the performance of an AS/400 application. While some work better than others, few can match the impact of the technique discussed in this article. Find out how you can improve both interactive response time and batch throughput by making better use of your system's memory.

For the CPU to process data, the data must reside in main memory. Wouldn't it be great if, when you had enough memory available, you could force an entire file or program into memory, eliminating a substantial amount of disk activity? Since disk access is relatively slow in comparison to memory access, it could greatly improve application performance.

Suppose you have a program that reads every record in the customer master file and prints a report. Every time the program performs a read, the job checks main memory to see if the record it needs to process resides there. If it finds the record, processing continues. If not, the job submits a disk request to bring the data in from disk, and the job goes into a wait state until the data is placed into main memory.

Whenever data that needs to be processed does not reside in main memory, the job incurs additional CPU overhead, additional disk overhead and lots of waiting.

There is an AS/400 memory- management technique you may not be aware of that could help. You may not even have to modify a single line of code to implement it! Introduced in V2R2, the Set Object Access (SETOBJACC) command can place an entire file (*FILE) or program (*PGM) into a specific main storage pool. This process, which I'll refer to as datapooling, eliminates the subsequent disk requests ordinarily needed to read a file or program. The SETOBJACC command can greatly improve response times for your interactive jobs, cause your batch jobs to run in a fraction of the time they originally took, and decrease your overall CPU utilization and disk access.

Perhaps you attempted to use SETOBJACC before and saw little benefit from it. Although the command is easy to implement, you must take certain requirements into consideration to realize any benefits from it.

Beyond Record Blocking

Datapooling is similar to blocking, except that instead of bringing a select number of records into memory, a whole file or program is brought in. Even if you happen to read a file by key, you don't need to perform any disk requests. All data in the file is placed in memory.

Part of the reason this works is because data anywhere in main memory can be accessed by any job. Even if your job runs in the QINTER pool, it can access data in another pool. So it doesn't matter which pool initially contains the data.

SETOBJACC only benefits jobs that are reading or updating files-it has no effect on disk writes. Some examples of programs and files that make good datapool candidates include:

 o A customer inquiry called from many different data-entry applications. o Files used in a subfile display. o Table-file data used in many different programs, such as a warehouse description file. 

I'll provide some criteria later on to help you select objects to datapool.

Datapool Requirements

The SETOBJACC command brings objects into memory; but before you can use this command, you need to do some preliminary processing and research.

Follow these three essential steps in order to take full advantage of datapooling:

1. Find or create a storage pool in main memory to hold the files and programs that you want to datapool.

2. Prepare the selected pool memory area for the files and objects.

3. Select the files and programs for datapooling. (This requires some research.)

Finding or Creating a Datapool Area

Since memory on the AS/400 is divided into pools, you need to specify an existing pool or create a new one for datapooling.

It's not always necessary to create a new storage pool. For example, nighttime batch processing can make use of existing storage pools as long as no interactive work is being performed. In this case, you can datapool objects directly into the existing interactive pool. Since no jobs will run in the interactive pool at night, your datapooled objects remain untouched. The interactive pool usually contains a great deal of memory which is otherwise unused during noninteractive hours.

If you're datapooling files and programs used in interactive and batch programs throughout the day, create a separate private pool. You shouldn't datapool these objects into the interactive or batch pool, because other jobs run in these pools. Those jobs might use the datapool object's memory pages, nullifying the effect of datapooling.

To illustrate the use of a private storage pool, create a new subsystem as follows:


You now have a subsystem called DATAPOOL. Storage pool 1 points to *BASE. Storage pool 2 (a private pool) will be used to datapool objects. It is initially set to 100KB. Only one activity level is assigned, since no jobs will be allowed to run in this pool.

You can start the subsystem manually with the Start Subsystem (STRSBS) command; but if it will be used every day, you should add it to your start-up program.

Next, you need to locate additional memory for this pool, which is currently set to 100KB. You'll need to take the memory for your new storage pool from one of the existing pools. Using the Work with System Status (WRKSYSSTS) command, you can view all pools in the system and change their memory allocations. Any pool in which the fault rate (DB and non-DB) is constantly less than 10 faults per second indicates the pool has too much memory allocated. Even if the faults for a particular pool appear high, you may be able to reallocate some memory. You can safely reduce the memory allocated to a pool if adding or subtracting memory doesn't affect the fault rate.

Memory removed from any pool is automatically added to the *BASE pool. You can now increase the DATAPOOL memory size by the amount of excess memory removed from the other pools plus any excess memory in *BASE.

Now you know the size of your pool, but it is still not ready to accept your objects.

Initializing the Datapool Area

In order to ensure that SETOBJACC works correctly, you must clear the memory allocated to your new pool of all existing data. Otherwise, the datapool objects could fail to reach main memory. To clear the datapool, issue the Clear Pool (CLRPOOL) command as follows:


This clears storage pool 2, which is the pool that contains memory for the datapool. You should run the CLRPOOL command whether you use a special pool or one of your existing pools (e.g., QINTER for nighttime processing). You won't harm your data-you're merely initializing space that once contained data.

At this point, you know which pools you can use for datapooling, how much memory you have to play with and how to initialize the memory-which leads to the next step.

Selecting Datapool Candidates

Finding datapool candidates for nighttime batch jobs is usually easy. Look for programs that read or update a large number of records in a file. A logical file and the physical file it is based on are both ideal datapool candidates, as is a physical file that is read by key. Also, look for files in long-running programs that are being read or updated. Investigate files that are read by many programs during the nightly process. These files are all excellent candidates for datapooling.

Finding datapool candidates for interactive jobs is a bit more difficult. Here are a few suggestions.

1. If you've worked on an application, you should have a good idea which files are used in nearly every program. These files are excellent candidates.

2. If you have the Performance Tools/400 (5738PT1), take a look at the Interactive Programs Statis-tics section of the transaction report. (To print this report, you need to specify that trace data be collected.) It lists heavily used programs and how many synchronous database accesses occur per transaction. Analyzing these programs will help you isolate files which are datapool candidates. Programs with many transactions could be datapool candidates themselves.

3. Files used in subfile programs are good candidates. Every time a subfile is loaded with records, the file or files containing the data are read many times. More often than not, these files are accessed by a logical file. You can make a big difference in response time for subfile programs by datapooling both the logical and physical files. Other potential candidates include programs which are called often within the subfile load. For instance, if you have a program that formats text before each subfile record is written, the called program is a candidate for datapooling.

4. Run a disk monitor to collect information about how often objects are accessed from disk. Frequently accessed objects are definitely objects you'd like to datapool.

Run the disk monitor during a busy part of the day, for a maximum of two to three minutes, and repeat the process several times for a true picture of the objects most often accessed from disk. The Performance Tools menu contains the option to start, end and print the disk collection. If you have V2R2 or a subsequent release of OS/400, you can also use the Retrieve Disk Information (RTVDSKINF) and the Print Disk Information (PRTDSKINF) commands to determine object usage.

Once you compile a list of datapool candidates, find out how large the objects are. You know the datapool size, so now you must ensure that the objects can fit in the datapool. You can obtain the object sizes with the Display Object Description (DSPOBJD) command. If an object is too large to fit into the datapool, you would not datapool it. For instance, you probably should not datapool a file that is 256MB.

If the datapool is too small to hold all of the datapool candidates, you need to dynamically datapool some of them. Make note of any datapool candidates used in just one program, and don't datapool them yet. You can do that dynamically, which I'll show you later. First, you want to data-pool as many of the heavily used objects as you can.

Performing the Datapool Operation

Finally, you are ready to assign objects to the datapool using SETOBJACC (1). You'll need to run this command for each object. In the next section, we'll discuss a CL program which does this automatically.

Finally, you are ready to assign objects to the datapool using SETOBJACC (Figure 1). You'll need to run this command for each object. In the next section, we'll discuss a CL program which does this automatically.

For each object, specify the qualified name of the object and *FILE or *PGM. If the object type is *FILE, the MBR option allows you to specify which file member to bring into the datapool. If you want all members in a multiple-member file to reside in the datapool, you need to perform a SETOBJACC for each member (member *ALL is not supported).

The MBRDATA option specifies whether you want the physical data, the access path, or both to be brought into the datapool. The default is both.

The storage pool parameter specifies where to put the datapool object. *JOB places the object in the pool the job is running out of; *BASE puts the datapooled object in *BASE; *SHRPOOLx (where x can be a value of 1-10) allows you to use shared pools *SHRPOOL1-*SHRPOOL10; and *PURGE removes the datapool object from memory (a useful option for dynamic datapooling). The second element of the storage pool parameter allows you to specify the subsystem pool ID to use for the datapool.

The storage pool option is where most people run into problems when attempting to datapool objects. For instance, suppose you want to use the interactive pool to datapool objects used in the nighttime process. To do this, you specify POOL(QINTER x), where x is the subsystem pool ID. Most people who realize no gains from the SETOBJACC command make the mistake of entering POOL(QINTER 1) for this parameter. However, on most AS/400s, subsystem pool 1 points to *BASE and memory is located in subsystem pool 2. You can use the Work with Subsystems (WRKSBS) command to see which subsystem pool number to use for a given subsystem.

A couple of notes about the SETOBJACC command are in order. Bringing objects into memory is very fast. SETOBJACC can easily bring in a 10MB file in just a few seconds. That means the datapooling of objects will take just a few seconds to execute.

If you run the command interactively, a message specifies how much of the object was brought in and how much unused space was available in the datapool to begin with. If the unused space in the datapool is not large enough to accommodate an entire object, one of two things can happen. The object might not be datapooled in its entirety, or the system might purge existing datapooled objects to make room for the current datapool request. The message allows you to determine if you are out of room in the datapool. This does not cause an error condition; it simply means that some of the objects might not be fully datapooled and you may not see the full benefit of datapooling.

Automating the Process

Now you're ready to write your CL programs to start datapooling. You'll use the first CL program, shown in 2, to datapool your candidates for daytime processing into the DATAPOOL subsystem created earlier. Let's assume you'll datapool three objects. The first is the physical file CUSMAS. The second is a logical file over CUSMAS called CUSMAS01. The third is a subfile inquiry program over the customer file called CMR200. All objects reside in library LIB.

Now you're ready to write your CL programs to start datapooling. You'll use the first CL program, shown in Figure 2, to datapool your candidates for daytime processing into the DATAPOOL subsystem created earlier. Let's assume you'll datapool three objects. The first is the physical file CUSMAS. The second is a logical file over CUSMAS called CUSMAS01. The third is a subfile inquiry program over the customer file called CMR200. All objects reside in library LIB.

The CL program in 2 would run every morning before your interactive work begins. You don't have to hold up interactive work, though; interactive jobs can run concurrently with this program.

The CL program in Figure 2 would run every morning before your interactive work begins. You don't have to hold up interactive work, though; interactive jobs can run concurrently with this program.

You'll need a similar CL program to set up the datapool before nighttime processing.

Dynamic Datapooling

The next example shows how to datapool dynamically. Suppose CL program RPC100 (see 3) calls RPG program RPR100 which reads a file called REPMAS (representative master) during nighttime processing.

The next example shows how to datapool dynamically. Suppose CL program RPC100 (see Figure 3) calls RPG program RPR100 which reads a file called REPMAS (representative master) during nighttime processing.

The program in 3 brings REPMAS into memory right before we call the program. Our datapool in this example is QINTER, subsystem pool 2 (a shared pool). This is the only program that needs to use the file. We don't want to keep the REPMAS file in main memory after the program completes, so we purge it from memory by using the *PURGE option of SETOBJACC. This frees up memory for other objects to be brought in. If you use a shared pool for datapooling, be sure that expert cache is not active for that pool or you may not realize the benefit you expect. (Look for an article on expert cache in an upcoming issue.)

The program in Figure 3 brings REPMAS into memory right before we call the program. Our datapool in this example is QINTER, subsystem pool 2 (a shared pool). This is the only program that needs to use the file. We don't want to keep the REPMAS file in main memory after the program completes, so we purge it from memory by using the *PURGE option of SETOBJACC. This frees up memory for other objects to be brought in. If you use a shared pool for datapooling, be sure that expert cache is not active for that pool or you may not realize the benefit you expect. (Look for an article on expert cache in an upcoming issue.)

Take Advantage of Datapooling

Using datapools allows you to utilize memory more efficiently. With some basic analysis, you can determine which objects to keep in memory, because you know they're being accessed from disk over and over again. You free the processor from the overhead of submitting these disk requests. You free the disk system from accessing this data multiple times. And you reduce the overall response times for jobs that access these objects.

Datapooling provides a glimpse of future disk-to-memory management. In V2R3, we're able to use expert cache, which attempts to hold heavily accessed objects in memory so that they won't need to be accessed repetitively. And don't think memory management stops here. You'll see enhancements to the operating system in the near future that will allow the AS/400 to forecast what data will be needed from disk before the data is requested. These operating system enhancements will work with DASD enhancements to allow disk subsystems to keep pace with AS/400 processors.

Michael Catalani, president of Catalani Consulting, is an AS/400 consulting specialist and author of Performance Tuning Simplified, published by Midrange Computing. He can be reached on MC-BBS.

Improving Performance with SETOBJACC

Figure 1 The SETOBJACC Command

 Set Object Access (SETOBJACC) Type choices, press Enter. Object . . . . . . . . . . . . . Name Library . . . . . . . . . . . *LIBL Name, *LIBL, *USRLIBL... Object type . . . . . . . . . . *FILE, *PGM Storage pool: Shared pool or subsystem name Name, *JOB, *BASE... Pool identifier . . . . . . . 1-10 Bottom F3=Exit F4=Prompt F5=Refresh F12=Cancel F13=How to use this display F24=More keys 
Improving Performance with SETOBJACC

Figure 2 Daytime Processing CL

Improving Performance with SETOBJACC

Figure 3 Dynamic Datapool Example (CL Program RPC100)







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    • Manage
    • And distribute documents digitally


  • IBM i: It’s Not Just AS/400


    IBM’s Steve Will talks AS/400, POWER9, cognitive systems, and everything in between

    Are there still companies that use AS400? Of course!

    IBM i was built on the same foundation.
    Watch this recorded webinar with IBM i Chief Architect Steve Will and IBM Power Champion Tom Huntington to gain a unique perspective on the direction of this platform, including:

    • IBM i development strategies in progress at IBM
    • Ways that Watson will shake hands with IBM i
    • Key takeaways from the AS/400 days


  • Ask the RDi Experts

    SB_HelpSystems_WC_GenericWatch this recording where Jim Buck, Susan Gantner, and Charlie Guarino answered your questions, including:

    • What are the “hidden gems” in RDi that can make me more productive?
    • What makes RDi Debug better than the STRDBG green screen debugger?
    • How can RDi help me find out if I’ve tested all lines of a program?
    • What’s the best way to transition from PDM to RDi?
    • How do I convince my long-term developers to use RDi?

    This is a unique, online opportunity to hear how you can get more out of RDi.


  • Node.js on IBM i Webinar Series Pt. 2: Setting Up Your Development Tools

    Profound Logic Software, Inc.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. In Part 2, Brian May teaches you the different tooling options available for writing code, debugging, and using Git for version control. Attend this webinar to learn:

    • Different tools to develop Node.js applications on IBM i
    • Debugging Node.js
    • The basics of Git and tools to help those new to it
    • Using as a pre-built development environment



  • Inside the Integrated File System (IFS)

    SB_HelpSystems_WC_GenericDuring this webinar, you’ll learn basic tips, helpful tools, and integrated file system commands—including WRKLNK—for managing your IFS directories and Access Client Solutions (ACS). We’ll answer your most pressing IFS questions, including:

    • What is stored inside my IFS directories?
    • How do I monitor the IFS?
    • How do I replicate the IFS or back it up?
    • How do I secure the IFS?

    Understanding what the integrated file system is and how to work with it must be a critical part of your systems management plans for IBM i.


  • Expert Tips for IBM i Security: Beyond the Basics

    SB PowerTech WC GenericIn this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

    Don't miss this chance to take your knowledge of IBM i security beyond the basics.



  • 5 IBM i Security Quick Wins

    SB PowerTech WC GenericIn today’s threat landscape, upper management is laser-focused on cybersecurity. You need to make progress in securing your systems—and make it fast.
    There’s no shortage of actions you could take, but what tactics will actually deliver the results you need? And how can you find a security strategy that fits your budget and time constraints?
    Join top IBM i security expert Robin Tatam as he outlines the five fastest and most impactful changes you can make to strengthen IBM i security this year.
    Your system didn’t become unsecure overnight and you won’t be able to turn it around overnight either. But quick wins are possible with IBM i security, and Robin Tatam will show you how to achieve them.

  • How to Meet the Newest Encryption Requirements on IBM i

    SB PowerTech WC GenericA growing number of compliance mandates require sensitive data to be encrypted. But what kind of encryption solution will satisfy an auditor and how can you implement encryption on IBM i? Watch this on-demand webinar to find out how to meet today’s most common encryption requirements on IBM i. You’ll also learn:

    • Why disk encryption isn’t enough
    • What sets strong encryption apart from other solutions
    • Important considerations before implementing encryption



  • Security Bulletin: Malware Infection Discovered on IBM i Server!

    SB PowerTech WC GenericMalicious programs can bring entire businesses to their knees—and IBM i shops are not immune. It’s critical to grasp the true impact malware can have on IBM i and the network that connects to it. Attend this webinar to gain a thorough understanding of the relationships between:

    • Viruses, native objects, and the integrated file system (IFS)
    • Power Systems and Windows-based viruses and malware
    • PC-based anti-virus scanning versus native IBM i scanning

    There are a number of ways you can minimize your exposure to viruses. IBM i security expert Sandi Moore explains the facts, including how to ensure you're fully protected and compliant with regulations such as PCI.



  • Fight Cyber Threats with IBM i Encryption

    SB PowerTech WC GenericCyber attacks often target mission-critical servers, and those attack strategies are constantly changing. To stay on top of these threats, your cybersecurity strategies must evolve, too. In this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access




  • 10 Practical IBM i Security Tips for Surviving Covid-19 and Working From Home

    SB PowerTech WC GenericNow that many organizations have moved to a work from home model, security concerns have risen.

    During this session Carol Woodbury will discuss the issues that the world is currently seeing such as increased malware attacks and then provide practical actions you can take to both monitor and protect your IBM i during this challenging time.


  • How to Transfer IBM i Data to Microsoft Excel

    SB_HelpSystems_WC_Generic3 easy ways to get IBM i data into Excel every time
    There’s an easy, more reliable way to import your IBM i data to Excel? It’s called Sequel. During this webinar, our data access experts demonstrate how you can simplify the process of getting data from multiple sources—including Db2 for i—into Excel. Watch to learn how to:

    • Download your IBM i data to Excel in a single step
    • Deliver data to business users in Excel via email or a scheduled job
    • Access IBM i data directly using the Excel add-in in Sequel

    Make 2020 the year you finally see your data clearly, quickly, and securely. Start by giving business users the ability to access crucial business data from IBM i the way they want it—in Microsoft Excel.



  • HA Alternatives: MIMIX Is Not Your Only Option on IBM i

    SB_HelpSystems_WC_GenericIn this recorded webinar, our experts introduce you to the new HA transition technology available with our Robot HA software. You’ll learn how to:

    • Transition your rules from MIMIX (if you’re happy with them)
    • Simplify your day-to-day activities around high availability
    • Gain back time in your work week
    • Make your CEO happy about reducing IT costs

    Don’t stick with a legacy high availability solution that makes you uncomfortable when transitioning to something better can be simple, safe, and cost-effective.



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  • Backup and Recovery on IBM i: Your Strategy for the Unexpected

    SB HelpSystems SC 5413Robot automates the routine 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:
    - Simplified backup procedures
    - Easy data encryption
    - Save media management
    - Guided restoration
    - Seamless product integration
    Make sure your data survives when catastrophe hits. Try the Robot Backup and Recovery Solution FREE for 30 days.

  • Manage IBM i Messages by Exception with Robot

    SB HelpSystems SC 5413Managing messages on your IBM i can be more than a full-time job if you have to do it manually. 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:
    - Automated message management
    - Tailored notifications and automatic escalation
    - System-wide control of your IBM i partitions
    - Two-way system notifications from your mobile device
    - Seamless product integration
    Try the Robot Message Management Solution FREE for 30 days.

  • Easiest Way to Save Money? Stop Printing IBM i Reports

    SB HelpSystems SC 5413Robot 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:

    - Automated report distribution
    - View online without delay
    - Browser interface to make notes
    - Custom retention capabilities
    - Seamless product integration
    Rerun another report? Never again. Try the Robot Report Management Solution FREE for 30 days.

  • Hassle-Free IBM i Operations around the Clock

    SB HelpSystems SC 5413For over 30 years, Robot has been a leader in systems management for IBM i.
    Manage your job schedule with the Robot Job Scheduling Solution. Key features include:
    - Automated batch, interactive, and cross-platform scheduling
    - Event-driven dependency processing
    - Centralized monitoring and reporting
    - Audit log and ready-to-use reports
    - Seamless product integration
    Scale your software, not your staff. Try the Robot Job Scheduling Solution FREE for 30 days.

  • ACO MONITOR Manages your IBM i 24/7 and Notifies You When Your IBM i Needs Assistance!

    SB DDL Systems 5429More than a paging system - ACO MONITOR is a complete systems management solution for your Power Systems running IBM i. ACO MONITOR manages your Power System 24/7, uses advanced technology (like two-way messaging) to notify on-duty support personnel, and responds to complex problems before they reach critical status.

    ACO MONITOR is proven technology and is capable of processing thousands of mission-critical events daily. The software is pre-configured, easy to install, scalable, and greatly improves data center efficiency.