AS/400 JDBC Performance in Overdrive

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People often come to me for help with application design. Usually they have a pretty good idea of what they want to do and a vague idea of how they want to do it, and they often have arbitrary performance goals. Getting people to reconsider their performance goals is usually the hardest thing to do. Often it is easier to convince someone that his application should accomplish a different task than it is to convince him he doesn’t need performance levels as demanding as he thinks.

Remember that you can always get the performance level you need over time by building an application that is functional, scalable, and maintainable. Don’t be too concerned that you plan to have it rolled out to 10,000 people within five years if you are going to have it used by only 1,000 people by next year. Build the right infrastructure and performance tune later; your requirements are going to change. The application is going to be used in different ways than you can envision up front. And you probably will have replaced or augmented some, or all, of the involved hardware within five years. I have watched whole projects fail because too much time was spent on performance too early. The application functionality simply never got completed or got so complex that no one could finish it. One of the key tips to ensuring optimal performance of your application is to put it in perspective. There is a time and a place for performance optimization. Developers of the most successful projects recognize that functionality comes first and performance comes second. Take a look at how to achieve some of the most demanding performance goals.

The Right Tools Are Critical

For optimal Java Database Connectivity (JDBC) performance, it is critical that you keep up with current releases and that you apply PTFs as they are made available. IBM is always finding ways to make JDBC perform faster. A good way to do this is with the block insert enhancement PTF just completed for V4R5. (There is more detail on this PTF later in the article. It was just wrapping up at press time and should be available by the time you read this). In internal testing, this PTF was making common batch updates perform three times faster, while putting considerably less stress on the garbage collector. (Keep in mind that this test was a comparison of the new code in debug views with the old fully optimized

code.) The benefit of applying PTFs as they become available is that you get performance enhancements without waiting to the next major OS/400 release. I save major releases for new versions of the specifications, support for new APIs, and other stuff like that.

Analyze What Is Being Done

So, once you are staying current and getting down to serious JDBC work, the next thing you need to do is invest some time in understanding the work flows of your application. Nothing is done by magic. Understanding how your application work flows relate to JDBC, and how JDBC requests relate to the underlying database work that has to be accomplished, is an important part of predicting how to layout functionality for best performance.

The first place you want to focus your attention is on your application. Evaluate what work you need to accomplish. What is an acceptable response time? How much of the work has to be done in the critical path? Can background threads do some of the work? What are you willing to trade off, in terms of cache size, for application performance? What are the common cases, and what are the extreme cases? Are there common pieces of work that can be factored out and reused? You need to evaluate all of these questions and exercise a bit of creativity in your application layout.

The second place you want to focus your attention is on the layout of your JDBC calls. Don’t focus here first, because you are only interested in JDBC calls in your code’s “hot spots.” There is no point in optimizing a piece of code that is not performance-critical. You can count on many of the common JDBC functions to be very efficient, but there are a couple common things to look out for.

Simple Fixes

These are some simple performance fixes you can implement. One such fix, when dealing with ResultSets, is using the getXXX method, which takes in an integer instead of the version that takes in a String. There are two reasons for this. The first is that, under the covers, the database only understands numeric columns. Therefore, the ResultSet.getInt(String colName) method does the exact same work that the ResultSet.getInt(int colIndex) method does, but first it has to resolve the colName into a colIndex value. Obviously, the version taking in a String can never perform as well as the version taking in an int. The second reason is that this type of processing is often a heavily used piece of code. The statement is created only once and then executed only once, but there could be hundreds of rows fetched and thousands of data values retrieved. In this case, a little overhead paid for a lot of times can really add up.

Another performance fix is selecting the specific columns you will use on queries instead of taking the SELECT * approach. The reason for this is that there is a fair amount of hidden overhead in having the JDBC driver deal with unused columns. Even though your application never retrieves the columns, the JDBC driver still has to fetch them from the database. This is wasted data movement and wasted space that your application is taking.

Yet another performance fix is using PreparedStatement objects instead of Statement objects wherever possible. This seems like a simple tip, but it is common to see applications not do this. You’ll improve performance even if you only use the prepared statement twice. Prepared statements are so important that you should structure your programs around using them. There are few applications that can’t be designed to use prepared statements.

Caching to the Extreme

When a resource is necessary but expensive to create, the first thing that should pop into your mind is caching, or pooling. If a resource is expensive to create, you want to create as few of them as possible and reuse the ones you have already created. This is the principle

behind connection pools. Database connections are one of the most expensive resources to create. If you create a database connection every time you need to do database work, your application will not be successful.

Fortunately, database connections are also about the most reusable objects around. It is fairly easy to build a pool of database connections, to synchronize the adding of connections to the pool and the retrieval of connections from the pool, and to modify your app to use the pool instead of creating connections. I will not cover this in depth, but, if you are looking for a simple sample implementation of a connection pool or for more information on the subject, you can download my Spring COMMON presentation package ( In that package, I implement a connection pool and demonstrate a time test of how much more efficient it is to implement a pool than to create individual connections.

Note that connection pooling, while not hard to implement, is also often not necessary to implement. Many products and frameworks provide built-in connection pools that you can take advantage of instead of rolling your own. Products like WebSphere have an advanced connection pool framework, which you can use with only minor modifications to your application code. Consult the documentation for your specific application server or framework to see if there is built-in support.

Taking it one step further, the statement objects under a connection can also be pooled. While I say “statements” here, the pool is really more likely to consist of prepared statements or callable statements, which provide the pool with greater flexibility through the use of parameters. For example, say you wrote a real estate directory and the front page (assuming the application was a series of servlets and JavaServer Pages) of the application listed the properties that a particular agent was responsible for. From there, the agent could select a property and see a list of details about that particular property. The SQL statement for every agent that signs on will vary by just one value; it would be something like this:


Given this fact, it probably doesn’t make good sense to pool the connection and recreate the statement for every execution. Why not pool the connection and the prepared statement together? Assuming you wrote a very quick pool retrieval method, you would just have to set one parameter and execute the statement. See Figure 1 for the time measurements I recently achieved when I modified a piece of code to go from no pooling to connection pooling and then to statement pooling. A simple statement pool implementation is also a part of the COMMON presentation package and can be downloaded at the URL listed earlier. Of note here is that, once your pool is populated with the statements that are going to be used (something that can be done during startup or in the background before needed), you are basically doing the equivalent of static SQL.

Can you take it further? Sure. You can pool result sets, right? Well, I wouldn’t suggest it for a couple reasons. The first is that, once you have a result set, you have a state that is hard to get rid of. For example, if someone uses a result set and reads the first five rows before putting it back into the pool, what happens to the next person to use that result set? He reads the sixth row. You can use scrollable cursors to handle that by positioning to the first row and starting to read again, but scrollable cursors mess up the result set’s ability to block fetch data. Block fetch is a term for how the JDBC driver fetches data from the database. JDBC forces the user to fetch one row at a time from the database by way of the Next method. Under the covers, the JDBC driver fetches many rows at one time and keeps track of the user’s position in the block itself. It does this automatically, unless you use scrollable result sets. Then it switches back to fetching a single row at a time as needed.

There is a solution for situations in which the data can be cached as a group for reuse: The data can be “disconnected” from the database. For example, if you have an employee file with 1,000 employee records in it, and you use this information to regularly update screens in a human resources application, but the data is generally static (that is, you

are not adding new employees every couple of hours)—the whole employee table can be read out of the database into an object structure. Once the data is in an external structure of some sort, no database resources are required to use the data; the data can simply be used by the application.

While this might seem like a weird thing to do, the situations in which it could be used are quite common. Further, there are a number of advantages to this disconnection of the data. The first advantage is that database resources are not needed, so your limited database resources can be used for other work. A second advantage is that little overhead for the structures is involved, making it possible for you to use your data in new ways, like downloading it to a PDA and taking it with you. A third advantage is that, if the data for the application is “read only,” it can be used by multiple threads at the same time, which can significantly increase performance.

The JDBC 2.0 Optional Package provides a framework for an object called the RowSet, which provides for the capabilities I’ve described. Sun Microsystems has made available an early release of three different implementations of the RowSet interface. The CachedRowSet is the functional version of the technique I have described. The CachedRowSet even allows you to update the disconnected data and synchronize it back into the database later. If you are interested in investigating this technology further, I encourage you to download and experiment with the early release (http://java.sun. com/products/jdbc/); these row set implementations will be a standard part of Java Development Kit (JDK) 1.4.

Batch Mode Operations

You may be aware that one of the goals of JDBC 2.0 was to provide mechanisms by which applications could perform faster than in the past. (For a basic overview of batch mode processing, read the article “Test Driving JDBC 2.0 with jt400,” on the AS/400 NetJava Expert Web site, at cfm?id=159&md=19992.) One of the additions made to increase performance was batch mode operations. You may also have noticed that batch mode operations do not perform faster than operations done without batch mode (actually, they perform marginally slower). There is a new PTF for V4R5 that will change that, though—at least under certain conditions.

The problems with providing an optimized batch mode were many. First and foremost, you can only take advantage of functions that exist in the system. The AS/400 database does not have a generic batch mode that can be used to increase performance for all operations, but the database does provide for a blocked insert, which is significantly faster than doing inserts one at a time. These are the requirements for a blocked insert:

• The operation must be an insert

• The operation must use parameters (prepared statements only)

• The parameters must be lined up, end to end (the JDBC driver handles this internally)

Fortunately, the population of tables with a lot of data values is the most common use of batch updates. Figure 2 shows an example of a batch (admittedly, a small one) that could take advantage of the new blocked insert support. As stated earlier, batch operations that are blocked inserts will show very noticeable performance improvements with this new support. Look to the AS/400 Native JDBC Web site to provide more detailed information on this new feature.

Avoiding Expensive Data Translations

It is really cool how JDBC will take care of formatting various data types into other data types for you. This keeps your application code simple and elegant, but again, nothing ever happens without a cost. Many of the JDBC data manipulations are cheap, but some are expensive. You can expect the common data type conversions to be highly optimized. If you question whether or not you are doing a common data type conversion or not, I suggest you write a little program to test the performance of various options. Figure 3 is a snippet of code showing what this performance test might look like.

Other than writing your own performance test, here are some tips that you might find useful:

• Expect working with BigDecimals to be slow. Where possible, use BIGINTs, DOUBLEs, FLOATs, and other data types in the place of BigDecimals.

• Expect to pay a modest performance penalty for doing anything with ResultSet.getObject or PreparedStatement.setObject. These methods first figure out the data type of the object passed in, then they get the base data type from the object. Finally, they just do the same work that would have happened if you had passed the base type in the first place.

• Expect Date, Time, and Timestamp operations to be slow. They involve object creations and string manipulations. If your dates are just for viewing, store them in the database in CHAR fields and Get/Set them as strings.

• Consider using a BIGINT column and setLong/getLong if precision is your rationale for using NUMERIC or DECIMAL data and you are targeting V4R5.

• Expect setString of a NUMERIC or DECIMAL field to perform significantly better than in the past. This should help many AS/400 developers, as these data types are quite common.

The real danger with data translations is that they are found in either ResultSet.getXXX() method calls or PreparedStatement.setXXX() calls. Both of these types of operations are routinely found in the critical paths of an application and are sometimes called hundreds of times a second. So you want to ensure performance-critical applications are doing things efficiently with these calls.

Don’t Use Escape Syntax and Turn It Off

JDBC drivers are supposed to support escape syntax by default. Huh? What’s that? To achieve a higher degree of compatibility, JDBC drivers are supposed to be able to modify SQL statements passed to them to change them to the format that a particular database wants. This syntax is denoted by brackets ({}) in SQL strings that are passed to the driver. You can use the escape syntax to implement various SQL features that are not as standard as they should be, and each JDBC driver will modify the SQL string to the syntax of the particular database it runs on. This is a good idea on the surface, but few people ever use it. If you don’t intend to use escape syntax processing, turn it off so the JDBC driver is not parsing all of your SQL strings. You can do this through a connection attribute; the code to accomplish this task would look like this:


“jdbc:db2:localhost;do escape processing=false”);

If you do use escape syntax processing, you might want to consider eliminating it. The code required to handle escape processing is expensive, as it involves heavy string manipulation of the input SQL text. Anything that does heavy string manipulation is going

to cause lots of garbage collection. Of course, an application that makes wise use of caching, as discussed earlier, will not be generating enormous numbers of statements.

Send Me Your Tips

I hope the tips presented in this article prove useful to you as you continue on your journey through Java and JDBC development. If you have tips you have picked up along the way, please email them to me. I always enjoy learning new tips on Java and JDBC performance.


• AS/400 Native JDBC page:
• AS/400 Toolbox JDBC page:
• Sun Microsystem’s JDBC page:

Base unit of work
(100 inserts and
100 queries)
with no pooling used 42.867 seconds

Base unit of work
using a connection pool 24.315 seconds

Base unit of work
using a statement pool 1.367 seconds

Figure 1: Pooling connections and statements can make a big difference in performance.

// A batch that can use the new optimized batch support.
try {

// Obtain a database connection.

Connection c = DriverManager.


// Turn off autocommit for batch processing.


// Prepare a statement to insert into a database table.

PreparedStatement ps =

c.prepareStatement(“insert into mytable values(?)”);

// Setup a batch to insert 100 rows into the table.

for (int i = 1; i <= 100; i++) {

ps.setInt(1, i);



// Execute the batch.


// Cleanup the database resources.


} catch (Exception e) {

System.out.println(“Error!!! “);


Figure 2: This batch request takes advantage of the new batch update support.

// An example of testing the performance of an operation.
try {

// Keep track of the time that an operation starts.

java.util.Date start = new java.util.Date();

// Obtain a database connection.

Connection c = DriverManager.


// Keep track of the time that an operation ended.

java.util.Date end = new java.util.Date();

// Display the time needed to complete the operation.

long time = end.getTime() - start.getTime();

System.out.println(“Operation running time: “+time);

// Clean up.


} catch (Exception e) {

System.out.println(“Error!!! “);


Figure 3: This is a simple way to get an idea of the relative performance of JDBC operations.







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    These are just three common reasons why it might be time for your company to implement a paperless document management system.
    Watch the webinar to learn more and discover how easy it can be to:

    • Capture
    • 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.