Getting Started with DB2 Express-C

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294 Getting Started with DB2 Express-C Note: For more information about troubleshooting, watch this video: http://www.channeldb2.com/video/video/show?id=807741:Video:4462 A.1 Finding more information about error codes To obtain more information about an error code received, enter the code prefixed by a question mark in the Command Editor input area and click the Execute button. This is shown in Figure A.2. Figure A.2 – Finding more information about DB2 error codes The question mark (?) invokes the DB2 help command. Below are several examples of how to invoke it for help if you receive, for example, the SQL error code “-104”. All of the examples below are equivalent. db2 ? SQL0104N db2 ? SQL104N db2 ? SQL-0104 db2 ? SQL-104 db2 ? SQL-104N A.2 SQLCODE and SQLSTATE An SQLCODE is a code received after every SQL statement is executed. The meanings of the values are summarized below: • SQLCODE = 0; the command was successful • SQLCODE > 0; the command was successful, but returned a warning
Appendix A - Troubleshooting 295 • SQLCODE < 0; the command was unsuccessful and returned an error The SQLSTATE is a five-character string that conforms to the ISO/ANSI SQL92 standard. The first two characters are known as the SQLSTATE class code: • A class code of 00 means the command was successful. • A class code of 01 implies a warning. • A class code of 02 implies a not found condition. • All other class codes are considered errors. A.3 DB2 Administration Notification Log The DB2 administration notification log provides diagnostic information about errors at the point of failure. On Linux and UNIX platforms, the administration notification log is a text file called .nfy (e.g. “db2inst.nfy”). On Windows, all administration notification messages are written to the Windows Event Log. The DBM configuration parameter notifylevel allows administrators to specify the level of information to be recorded: • 0 -- No administration notification messages captured (not recommended) • 1 -- Fatal or unrecoverable errors • 2 -- Immediate action required • 3 -- Important information, no immediate action required (the default) • 4 -- Informational messages A.4 db2diag.log The db2diag.log provides more detailed information than the DB2 Administration notification log. It is normally used only by IBM DB2 technical support or experienced DBAs. Information in the db2diag.log includes: • The DB2 code location reporting an error. • Application identifiers that allow you to match up entries pertaining to an application on the db2diag.logs of servers and clients. • A diagnostic message (beginning with "DIA") explaining the reason for the error. • Any available supporting data, such as SQLCA data structures and pointers to the location of any extra dump or trap files. On Windows (other than Vista), the db2diag.log is located by default under the directory:
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GETTING STARTED WITH DB2 Express-C
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Contents About this book ..........
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Contents 7 6.3 DB2 storage model ..
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Contents 9 13.4.2 Cursor stability
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About this book Notices and tradema
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About this Book 13 A book for the c
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About this Book 15 Foreword Innovat
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1 Chapter 1 - What is DB2 Express-C
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Chapter 1 - What is DB2 Express-C?
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1.8 Moving up to another DB2 editio
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30 Getting Started with DB2 Express
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4 Chapter 4 - DB2 Environment The D
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Chapter 4 - DB2 Environment 61 Figu
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Chapter 4 - DB2 Environment 69 conf
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Chapter 4 - DB2 Environment 73 Tabl
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Chapter 4 - DB2 Environment 75 4.3
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Chapter 4 - DB2 Environment 77 6. S
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100 Getting Started with DB2 Expres
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6 Chapter 6 - DB2 Architecture In t
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6.3.3.4 Creating a Table Space usin
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8 Chapter 8 - Working with Database
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9 Chapter 9 - Data Movement Utiliti
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Chapter 9 - Data Movement Utilities
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11 Chapter 11 - Backup and Recovery
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11.4 Database logging from the Cont
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13 Chapter 13 - Concurrency and Loc
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Chapter 13 - Concurrency and Lockin
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13.10 Summary In this chapter we lo
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PART III - LEARNING DB2: APPLICATIO
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