JR31534: DB2 MAY ISSUE AN SQL0901N WHEN EXECUTING A NON-ATOMIC SCALAR SQL UDF WITH A GLOBAL VARIABLE.

DB2 Version 9.5 Fix Pack 4  for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 4a for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 5 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 6a for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 10 for Linux, UNIX, and Windows

APAR status

• Closed as program error.

Error description

• An SQL0901N may be issued when executing a query containing an
  SQL UDF.
  .
  The following conditions must be satisifed for the SQL0901N to
  be issued:
  - The SQL UDF in question must be non-atomic and must only
  return a global variable.
  - The query containing the SQL UDF must contain an explicit
  reference to a base table.
  .
  An example of such a UDF and query follows:
  .
  -- Table DDL
  CREATE TABLE T1(C1 CHAR);
  INSERT INTO T1 (C1) VALUES ('A');
  .
  -- Global variable declaration
  CREATE VARIABLE PUBLIC_GV INTEGER DEFAULT 1;
  GRANT ALL ON VARIABLE PUBLIC_GV TO PUBLIC;
  .
  -- SQL UDF DDL
  CREATE FUNCTION FN_901() RETURNS INTEGER LANGUAGE SQL NOT
  DETERMINISTIC RETURN PUBLIC_GV;
  .
  -- Query that will issue the SQL0901N
  SELECT FN_901() FROM T1;
  .
  The SQL0901N issued will be:
  SQL0901N  The SQL statement failed because of a non-severe
  system error.
  Subsequent SQL statements can be processed.  (Reason "internal
  error: no or
  wrong dcl ".)  SQLSTATE=58004
  .
  This issue will be fixed starting with DB2 Version 9.5 Fix Pack
  4.
  

Local fix

• If possible, rewrite the offending query to a semantically
  equivalent form that circumvents the conditions described above,
  e.g.,
  .
  -- Semantically equivalent queries that will circumvent the
  SQL0901N
  VALUES FN_901();
  SELECT FN_901() FROM SYSIBM.SYSDUMMY1;
  

Problem summary

• Users Affected:  SQL Functions using global variables.
  Problem Description:
  An SQL0901N may be issued when executing a query containing an
  SQL UDF.
  .
  The following conditions must be satisifed for the SQL0901N to
  be issued:
  - The SQL UDF in question must be non-atomic and must only
  return a global variable.
  - The query containing the SQL UDF must contain an explicit
  reference to a base table.
  

Problem conclusion

• First fixed in DB2 UDB Version 9.5, Fixpak 4
  

Temporary fix

• see LOCAL FIX
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  DB2 UDB EXE WIN

• Fixed component ID

  5724E4901

Applicable component levels

• R950 PSN

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