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Using iSeries ODBC Driver in a Linux Partition

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Linux, an open-source implementation of UNIX, is rapidly gaining acceptance among iSeries users. With the V5R2 enhancements, Linux for 64-bit PowerPC can run natively in as many as 31 separate logical partitions (LPARs). Traditionally, many organizations use the iSeries server as a reliable and highly scalable database server. The iSeries database, DB2 UDB for iSeries, is fully integrated in OS/400 and exploits its robust features, such as single-level storage, tight security, and object-based architecture. For these reasons, we at IBM believe that DB2 UDB for iSeries will remain the database of choice for most iSeries shops.

Generally, Linux applications can use three programming environments to access the iSeries database: ODBC, JDBC, and DB2 Connect gateway. This article provides implementation tips and a number of coding examples that illustrate how to optimize the access to your DB2 UDB for iSeries database from a Linux partition by using the iSeries ODBC driver for Linux.

ODBC has become the de facto standard application programming interface for providing connectivity to heterogeneous databases. Its popularity is based on its ability to access multiple vendor data sources from a single application. ODBC developers can create applications without being concerned about database-specific calls. The Rochester development lab provides the iSeries ODBC Driver for Linux that is based on the iSeries ODBC driver for Windows. The Linux ODBC driver uses the iSeries database host servers as the access point to the system. It communicates with the back-end database server job through a socket connection. The iSeries ODBC Driver for Linux is an ODBC 3.5 ANSI driver with the ability to store and process Unicode data. It is a no-charge iSeries licensed program (5733-LO1) that you can download.

Please note that the download site provides two separate install images:

  • ODBC Driver for Power PC
  • ODBC Driver for Intel-based Linux workstations


You need to download the PowerPC version if you plan to access iSeries from a Linux partition.

Note that Linux commands and utilities shown in the article have been executed using SuSE SLES 8 distribution. The command syntax and location of directories may differ slightly for other Linux distributions.

Installation and Configuration

Apart from the iSeries ODBC Driver for Linux, you need three other components in the Linux partition to successfully compile and run ODBC applications in a Linux partition:

unixODBC Driver Manager Version 2.0.11 or above--unixODBC is an application and library (referred to as a driver manager) that knows about available drivers, allows the definition of new data sources, and manages the connections to the defined data sources. Luckily, the Linux for iSeries distributions include precompiled, PowerPC versions of the unixODBC Driver Manager. You can use the following command to verify the version currently installed in your Linux partition:

rpm -qa | grep unixODBC


C/C++ compiler--The distributions contain a very good open-source GNU compiler. To check if it's installed on your system, run the following command:

gcc --version


libodbc.so shared library--This library is required at the link time. Make sure that the appropriate link exists in the /usr/lib directory. Sometimes, the soft link is missing; consequently, the link phase of the compile process will fail. You can easily fix this problem by manually creating the missing symbolic link to an implementation of the shared library that has been installed with the unixODBC driver manager. Here's an example:

ln -s /usr/lib/libodbc.so.1.0.0 /usr/lib/libodbc.so


Although a Red Hat Package Manager (RPM) image of the iSeries ODBC Driver for Linux may exist on your system, we strongly encourage you to download the latest version of the driver from the URL shown earlier in this article. You should have a copy of iSeriesODBC-5.1.0-0.14.ppc.rpm or later. This version contains several important memory fixes that significantly reduce the driver's memory footprint.

The driver can be installed with the RPM command. Here's an example:

rpm –ivh iSeriesODBC-5.1.0-0.14.ppc.rpm


The driver will not successfully install if a previous version exists on the system. In this case, you need to "boot out" the older version with the following command:

rpm –e iSeriesODBC


Sometimes, removing an RPM isn't practical, particularly if other programs on the system depend on it. In that case, re-install the driver using the --force option:

rpm –ivh –force iSeriesODBC-5.1.0-0.14.ppc.rpm


The RPM command installs the driver into the /opt/ibm/iSeriesODBC directory. You can quickly verify that the driver works properly by using the CWBPING utility that is part of the driver installation:

/opt/ibm/iSeriesODBC/bin/cwbping os400


Here, os400 is the TCP/IP host name of the OS/400 partition.

You could also use a physical IP address:

/opt/ibm/iSeriesODBC/bin/cwbping 192.168.10.1


Make sure that the connection to the Data Access host server job was successful. The driver install process registers the iSeriesODBC driver with the driver manager by adding the driver info to the odbcinst.ini configuration file. This file can be found in /etc/unixODBC directory (/etc with older versions of the driver manager). Here's example content of the odbcinst.ini file:

[iSeries Access ODBC Driver]
Description             = iSeries Access for Linux ODBC Driver
Driver                  = /opt/ibm/iSeriesODBC/lib/libcwbodbc.so
Setup                   = /opt/ibm/iSeriesODBC/lib/libcwbodbc.so
Threading               = 2


The next step in the configuration process is to create a data source name (DSN) entry for the iSeries database. You can accomplish this task either by using the graphical tool ODBCConfig or by editing the odbc.ini configuration file.

There are two types of DSN entries: system DSN and user DSN. The system DSN is usually created by root and resides in the /etc/unixODBC directory. Any user on the system can use a system DSN. A user DSN is scoped to a particular user and cannot be shared with other users on the system. The configuration file for a user DSN is called .odbc.ini and is located in the user's home directory--for instance, /home/jarek/.odbc.ini.

Here's an example entry for a system DSN added to the odbc.ini file:

[os400]
Description = iSeries os400
Driver = iSeries Access ODBC Driver
System = os400


Here, os400 is the host name of the target iSeries system.

Once the system DSN exists, you can use the isql utility (part of the unixODBC driver manager installation) to obtain an ODBC connection to the target DB2 UDB for iSeries database and execute SQL statements. The utility is a bit "clunky," but it can be quite useful to run simple ad hoc SQL statements. Figure 1 shows a simple isql session:

http://www.mcpressonline.com/articles/images/2002/Best%20Practices%20for%20using%20iSeries%20ODBC%20in%20LinuxV600.jpg

Figure 1: Use an isql session to run SQL statements. (Click images to enlarge.)
 

Type isql at the shell prompt to get some basic help info about supported syntax and options.

Simple ODBC C++ Application

This section covers ODBC implementation details for a sample C++ program called testodbc. To compile the source, use the following command in the Linux partition:

g++ -o testodbc –lodbc testodbc.cc


The application retrieves a number of rows from the QCUSTCDT table located in QIWS library. The selection criterion is based on the current value of the STATE parameter. Here's the SELECT statement used by testodbc:

select lstnam, city from qiws.qcustcdt where state = ?


Figure 2 shows the software components involved in the execution of this sample application.

http://www.mcpressonline.com/articles/images/2002/Best%20Practices%20for%20using%20iSeries%20ODBC%20in%20LinuxV601.jpg

Figure 2: This is how an ODBC client accesses DB2 on iSeries.
 

Although the testodbc application is fairly simple, it covers some important aspects of efficient ODBC programming for DB2 UDB for iSeries.

Addressing the Locale Issues

Let's start by examining the class constructor of the testodbc program, as seen in Figure 3.

TestODBC_Class::TestODBC_Class()
{
   // Set the locale for the application
   setlocale( LC_ALL, "" ); [1]

   // Allocate an environment handle
   rc = SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &EnvHandle);

   // Set the ODBC application version to 3.x
   if (rc == SQL_SUCCESS)
      rc = SQLSetEnvAttr(EnvHandle, SQL_ATTR_ODBC_VERSION,
                         (SQLPOINTER) SQL_OV_ODBC3, SQL_IS_UINTEGER);

   // Allocate a connection handle
   if (rc == SQL_SUCCESS)
      rc = SQLAllocHandle(SQL_HANDLE_DBC, EnvHandle, &ConHandle);
}

Figure 3: The class constructor for the sample application.

At [1], the locale is set for the application. This is important in cases where the Linux application uses the entire character set for a given client code page. For instance, it may use a special character, such as a tilde (~), as a keyword delimiter in a literal used in a WHERE clause. The iSeries ODBC driver is using the locale set up by the application to convert the SQL statements. If the application does not set up the locale in its class constructor or main() function, the default compiler "C" locale will be used. This means that a client code page of 367 will be used for some client conversions. These conversions do not handle much outside of the a-z, 0-9 character range. As a result, an SQL statement may not be properly converted to the database server code page. In this case, the DB2 runtime throws an SQL –104 error (Token was not valid). By specifying the locale in the application, you eliminate this risk.

Connection Keywords

The iSeries ODBC driver supports a number of connection keywords that you can use to control the connection properties and to improve the application's performance. The complete list of the connection keywords can be found in the iSeries Information Center.

There are several methods to specify the connection attributes. For instance, you can modify the DSN entry in the odbc.ini file. Figure 4 shows an example of a system DSN entry.

[os400]
Description = iSeries os400
Driver = iSeries Access ODBC Driver
System = os400
CommitMode = 2
ExtendedDynamic = 1
DefaultPkgLibrary = JAREK
DefaultPackage = A/DEFAULT(IBM),2,0,1,0,512
AllowUnsupportedChar = 1

Figure 4: Here's an example of a system DSN entry.

Alternatively, you can specify the connection attribute keywords on the connection string in the application. Figure 5 shows a code snippet illustrating this method.

char  ConnectStr[512] = "DSN=os400;UID=db2user;PWD=test26t;";
... 
   // Create an instance of the TestODBC_Class class
   TestODBC_Class  Example;
   ptr = strcat(ConnectStr,
         "CommitMode=2; ExtendedDynamic=1;DefaultPkgLibrary=JAREK;");
   ptr = strcat(ConnectStr,
         "DefaultPackage=A/DEFAULT(IBM),2,0,1,0,512;");
   ptr = strcat(ConnectStr,
         "AllowUnsupportedChar = 1;");

   // Connect to DB2 for iSeries database
   if (Example.ConHandle != NULL)
   {
   rc = SQLDriverConnect(Example.ConHandle, NULL,
   (SQLCHAR *)ConnectStr, SQL_NTS, NULL, 0, NULL, SQL_DRIVER_NOPROMPT);

Figure 5: Specify the connection attribute keywords on the connection string.

CommitMode specifies the default transaction isolation level. In this case, it is set to Read Uncommitted (*CHG).

ExtendedDynamic specifies whether to use extended dynamic (package) support. A value of 1 enables the packages. This is the default for iSeries ODBC driver.

DefaultPkgLibrary specifies the library for the SQL package.

DefaultPackage specifies how the extended dynamic (package) support will behave.
The SQL packages are server-side repositories for SQL statements. Packages contain the internal structures--such as parse trees and access plans--needed to execute SQL statements. Because SQL packages are a shared resource, the information built when a statement is prepared is available to all the users of the package. This saves processing time, especially in an environment where many users are using the same or similar statements. Because SQL packages are permanent, this information is also saved across job initiation/termination and across IPLs. In fact, SQL packages can be saved and restored on other systems. Usually, there is no need to delete SQL packages, but sometimes it is still reasonable to delete them, especially when you make significant changes to the database design. You can use the WRKOBJ command to locate and delete an SQL package. Here's the command to find the SQL package for the testodbc application:

WRKOBJ OBJ(JAREK/*ALL) OBJTYPE(*SQLPKG)


The actual package name is TESTODBCVBA and is generated by the system. The SQL packages are named by taking the client application name and appending three letters that are an encoded set of the package configuration attributes.

Consult the FAQ document for more details about the iSeries SQL package support.

Reusable Open Data Paths (ODPs)

An open data path (ODP) definition is an internal OS/400 object that is created when certain SQL statements (such as OPEN, INSERT, UPDATE, and DELETE) are executed for the first time in a given job (or connection). An ODP provides a direct link to the data so that I/O operations can occur. The process of creating a new ODP object is fairly CPU- and IO-intensive, so whenever possible, the iSeries DB2 runtime tries to reuse the existing ODPs. For instance, a SQLCloseCursor() API call may close the SQL cursor but leave the ODP available to be used the next time the cursor is opened. This can significantly reduce the processing and response time in running SQL statements. A reusable OPD usually requires 10 to 20 times less CPU resources than a newly created ODP. Therefore, it is important that the applications employ programming techniques that allow the DB2 runtime to reuse ODPs.

With dynamic interfaces, such as ODBC or JDBC, full opens are avoided by using a "prepare once, execute many" programming paradigm. It means that when an SQL statement is going to be executed more than once, you should prepare the statement just once and then reuse the prepared statements for consecutive executions. Although DB2 does try to convert literals to parameter markers so that similar statements can be reused, it is a better programming practice to explicitly implement parameter markers. That way, you can quite significantly improve the chances for reusable ODPs. The code snippet in Figure 6 illustrates how to implement the "prepare once, execute many" programming technique.

strcpy((char *) SQLStmt, 
       "select lstnam, city from qiws.qcustcdt where state = ?"); [1]
// Prepare the SQL statement
rc = SQLPrepare(Example.StmtHandle, SQLStmt, SQL_NTS); [2]
// Bind the columns in the result data set returned to
// application variables
rc = SQLBindCol(Example.StmtHandle, 1, SQL_C_CHAR, (SQLPOINTER)
                Example.LastName, sizeof(Example.LastName), NULL);
rc = SQLBindCol(Example.StmtHandle, 2, SQL_C_CHAR, (SQLPOINTER)
                Example.City, sizeof(Example.City), NULL);
for (int i = 0; i < LOOPS ; i++)
  {
    //Set the current value for the parameter marker
    rc=SQLBindParameter(Example.StmtHandle,
                        1,SQL_PARAM_INPUT,SQL_C_CHAR,SQL_CHAR,
                        3,0,(SQLPOINTER) currentState[i%3],0,NULL); [3]
    //Execute the statament with the current parameter
    rc = SQLExecute(Example.StmtHandle); [4]
    cout << endl << "Current State : " << currentState[i%3] << endl; 
    // Display The Results Of The SQL Query
    Example.ShowResults();
    if(rc != 0)
 break;
  }

Figure 6: Use the "prepare once, execute many" programming technique.

The error-handling code has been removed for clarity. At [1], the statement text is assigned to a variable. Note that a parameter marker is used in the WHERE clause. The statement is then prepared just once at [2]. The current value of the parameter is bound to the prepared statement at [3]. The prepared statement is executed at [4]. Steps [3] and [4] are repeatedly executed in a for loop.

Techniques and Fixes to Further Improve ODBC Performance

I've discussed the techniques used by a sample application to tune the ODBC performance. However, depending on your application architecture, you may consider other methods of improving ODBC performance.

Connection Pooling

The unixODBC manager supports connection pooling, which can potentially limit the number of connections required by your application-accessing iSeries database. All depends on whether your application processes running in a Linux partition can be shared/reused by multiple clients. The unixODBC connection pooling implementation is scoped to a process. In other words, the connection is reused if the calling process is the same as the process that initiated it. So, if your application creates and drops connections from a limited number of persistent processes, the connection pooling will certainly improve the performance. Setting up the connection pooling is easy. Just edit the odbcinst.ini so it looks as shown in Figure 7.

[ODBC]
Trace       = No
Trace File  = /tmp/sql.log
Pooling     = Yes

[iSeries Access ODBC Driver]
Description = iSeries Access for Linux ODBC Driver
Driver = /opt/ibm/iSeriesODBC/lib/libcwbodbc.so
Setup = /opt/ibm/iSeriesODBC/lib/libcwbodbc.so
Threading = 2
FileUsage = 1
DontDLClose = 1
CPTimeout   = 600

Figure 7: Set up connection pooling by editing the odbcinst.ini.

The critical values are Pooling = Yes and CPTimout. You may want to experiment with the latter value. In the example, it was set to 10 minutes. The settings shown above worked fine with a test program that opened and closed a connection several times. During the program execution, there was one QZDASOINIT job on the iSeries because the SQLDisconnect request was intercepted by the driver manager, and the connection was actually not closed.

Note that the connection pooling implemented by unixODBC is functionally similar to the connection pooling on Windows provided by the MS ODBC manager.

Blocking, Stored Procedures, and Result Sets

Reduce the number of trips to the server with blocking, stored procedures, and result sets. See IBM's iSeries 400 PC Client/Server Programming Web site for iSeries-specific implementation details.

Fix for Apps Frequently Switching the AUTOCOMMIT Mode

Some ODBC applications frequently switch the AUTOCOMMIT mode on and off. For instance, when transactional work is done, the AUTOCOMMIT is switched off; then, right after the transaction is committed or rolled back, the application switches the AUTOCOMMIT back on. This processing flow may cause some ODPs to become non-reusable. Recently, the Rochester lab provided a fix that eliminates the non-reusable ODPs even if the application oscillates the AUTOCOMMIT setting. The required fixes are SI07460 for V5R1 and SI08248 for V5R2.

Troubleshooting

Troubleshooting a multi-tier application may be a bit tricky, because you need to deal with software components that reside in separate partitions. Our experience shows that two tools are particularly useful for pinning down the potential problem areas:

  • The joblog messages for a database server job usually provide enough details to isolate DB2 runtime issues.
  • The ODBC trace utility provides granular information about the data flow between your Linux application and the database server job.

Job Log Messages

As mentioned earlier, an ODBC client communicates with a corresponding iSeries server job. This server job runs the SQL requests on behalf of the client. More precisely, when an ODBC client submits an SQL statement, the statement is passed to a server job that, in turn, calls the DB2 runtime to execute the statement. The results are then reformatted and marshaled to the client. The iSeries database access server jobs are called QZDASOINIT, and they run in the QUSRWRK subsystem. At any given time, there maybe a large number of database server jobs active on the system, so the first step is to identify the job that serves your particular ODBC connection. The easiest method to accomplish this task is to run the following CL command from the OS/400 prompt:

WRKOBJLCK OBJ(DB2USER) OBJTYPE(*USRPRF)


Here, DB2USER is the user profile you use to connect to the iSeries system. Note that a QZDASOINIT job is assigned to an ODBC connection after the connection has been established, so you need to set a breakpoint in the client application below the SQLDriverConnect API call.

Once the Work with Object Locks appears, key in 5 (Work with Job) next to the only QZDASOINIT job that should be listed. This shows the Work with Job dialog. Select option 10 to display the job log for the database server job. Now, you can search the job log for any error messages generated by the DB2 runtime.

Sometimes, it's also useful to include debug messages in the job log. The debug messages are informational messages written to the job log about the implementation of a query. They describe query implementation methods such as use of indexes, join order, ODP implementation (reusable versus non-reusable), and so on. The easiest way to instruct the iSeries to include the debug messages is to specify the TRACE=4 keyword on the connection string. Here's an example:

char  ConnectStr[512] = "DSN=os400;UID=db2user;PWD=test26t;TRACE=4;";


A sample of the job log messages with debug messages enabled is shown below, in Figure 8:

User DB2USER from client 192.168.10.2 connected to server.
SET TRANSACTION complete.
STATEMENT TEXT FOUND : select lstnam, city from qiws.qcustcdt where state = ?.
Statement STMT0002 found in package TESTODBVBA in library QGPL.
Arrival sequence access was used for file QCUSTCDT.
Unable to retrieve query options file.
ODP created.
Blocking used for query.
Cursor SQL_CUR1001EE08 opened.
2 rows fetched from cursor SQL_CUR1001EE08.
ODP not deleted.

Figure 8: Job log messages with debug messages enabled looks like this.

So the job log offers fairly detailed info on how the ODBC client requests were implemented by the DB2 runtime.

ODBC Trace

The iSeries ODBC driver provides the cwbtrc utility, which can be used to collect detailed client-side traces and logs. Rather than writing all the data out to a daemon and letting it format and store the data--which is how the Windows tracing operates--the Linux tracing writes everything straight out to ASCII text files.

The tracing is switched off by default. We recommend that you use the following parameters when invoking the cwbtrc utility:

/opt/ibm/iSeriesODBC/bin/cwbtrc /dt:1 /hl:1


The /dt:1 parameter turns the Detail Trace on, while /hl:1 turns the History Log on. At this point, tracing is activated and no further configuration is required. The trace files will be placed in the .iSeries_ODBC directory located in your home directory. The output files have the following naming convention:

  • cwbdetail--pid.csv
  • cwbhistory--pid.csv


See the driver's online documentation for specific syntax and functionality of other cwbtrc parameters.

The Detail Trace and the History Log store their data in semi-colon delimited text files. Figure 9 shows a short excerpt from a sample Detail Trace that shows that the SQLDisconnect call failed because the connection had a pending transaction:

04/07/2003;00:57:58.134;ODBC;21748;21748;10008;0x82000001: odbcconn.SQLDisconnect Entry
04/07/2003;00:57:58.134;ODBC;21748;21748;10008;odbcerr.storeError Entry
04/07/2003;00:57:58.135;ODBC;21748;21748;10008;odbcerr.finishAndInsertErr Entry
04/07/2003;00:57:58.135;ODBC;21748;21748;10009;err: [IBM][iSeries Access ODBC 

Driver]Invalid transaction state. dsn: OS400 sys: os400
04/07/2003;00:57:58.135;ODBC;21748;21748;10008;odbcerr.finishAndInsertErr Exit
04/07/2003;00:57:58.135;ODBC;21748;21748;10008;odbcerr.storeError Exit
04/07/2003;00:57:58.136;ODBC;21748;21748;10008;0x82000001: odbcconn.SQLDisconnect Exit

rc=-1

Figure 9: This sample Detail Trace shows that the SQLDisconnect call failed.

Detail Trace contains the following columns:

  • Date
  • Time or Tick Count (depending on configuration)
  • Component
  • Process ID
  • Thread ID
  • Trace ID
  • Trace Data


The History Log contains these columns:

  • Date
  • Time or Tick Count (depending on configuration)
  • Component
  • Process ID
  • Thread ID
  • History Data

If your trace files exceed the maximum size, they will wrap and begin writing at the beginning over old data. When this happens the last entry in the file will be above a line that merely reads " ".

Sometimes, IBM service may request that you also collect the SQL.log. This utility is provided by the unixODBC driver manager and can be either enabled through ODBCConfig or manually configured in the odbc.ini. Here's an example of the appropriate entry in odbc.ini:

[ODBC]
Trace       = Yes
Trace File  = /tmp/sql.log

Additional Information


ITSO offers two Redbooks that can be helpful to those who want to learn more about OS/400 Linux integration:

  • Linux Integration with OS/400 on the IBM--iSeries Server (SG24-6551)
  • Linux on the IBM--iSeries Server: An Implementation Guide (SG24-6232)


Jarek Miszczyk is the Senior Software Engineer, PartnerWorld for Developers, IBM Rochester. He can be reached by email at This email address is being protected from spambots. You need JavaScript enabled to view it..

Jarek Miszczyk

Jarek Miszczyk is a Lead Technical Consultant for System x Virtualization and Cloud Computing at the IBM STG Global ISV Enablement organization. He is located in Rochester, Minnesota. He can be reached by email at This email address is being protected from spambots. You need JavaScript enabled to view it..

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  • 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: