93 lines
6.1 KiB
HTML
93 lines
6.1 KiB
HTML
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<meta name="DC.Title" content="Restrictions when creating or working with distributed files with DB2 Multisystem" />
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<title>Restrictions when creating or working with distributed files with DB2 Multisystem</title>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Restrictions when creating or working with distributed files with DB2<sup>®</sup> Multisystem</h1>
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<div><p>You need to be aware of some restrictions when creating or working
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with distributed files.</p>
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<p>These restrictions are:</p>
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<ul><li>First-change first-out (FCFO) access paths cannot be used because the
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access paths are partitioned across multiple nodes.</li>
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<li>A distributed file can have a maximum of one member.</li>
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<li>A distributed file is not allowed in a temporary library (QTEMP).</li>
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<li>Data in the partitioning key has a limited update capability. Generally,
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when choosing a partitioning key, you should choose fields whose values do
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not get updated. Updates to the partitioning key are allowed as long as the
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update does not cause the record to be partitioned to a different node.</li>
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<li>Date, time, timestamp, or floating-point numeric fields cannot be used
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in the partitioning key.</li>
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<li>Source physical files are not supported.</li>
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<li>Externally described files are supported for distributed files; program-described
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files are not supported.</li>
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<li>If the access path is unique, the partitioning key must be a subset of
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the unique key access path.</li>
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<li>Constraints are supported, and referential constraints are supported only
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if the node group of both the parent and foreign key files are identical and <em>all</em> of
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the fields of the partitioning key are included in the constraint. The partitioning
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key must be a subset of the constraint fields. Also, for unique and primary
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constraints, if the access path is unique, the partitioning key must be a
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subset of the unique key access path.</li>
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<li>On the CRTPF command, the system parameter must have the value *LCL specified
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(CRTPF SYSTEM(*LCL)). SYSTEM(*RMT) is not allowed.</li>
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<li>Any time a logical file is created over a distributed file, the logical
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file also becomes distributed, which means that you cannot build a local logical
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file over just one piece of the physical file on a specific node. SQL views
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are the exception to this, if the view is a join and if all of the underlying
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physical files do not have the same node group. In this case, the view is
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only created on the local system. Even though this view is not distributed,
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if you query the view, data is retrieved from all of the nodes, not just from
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the node where the view was created. <p>Join files can only be created using
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SQL.</p>
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<p>For DDS-created logical files, only one based-on file is allowed.</p>
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</li>
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<li>Coded character set identifiers (CCSIDs) and sort sequence (SRTSEQ) tables
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are resolved from the originating system.</li>
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<li>Variable-length record (VLR) processing is not supported. This does not
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mean that variable-length fields are not supported for distributed files.
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This restriction only refers to languages and applications that request VLR
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processing when a file is opened.</li>
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<li>End-of-file delay (EOFDLY) processing is not supported.</li>
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<li>Data File Utility (DFU) does not work against distributed files, because
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DFU uses relative record number processing to access records.</li>
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<li>A distributed file cannot be created into a library located on an independent
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auxiliary storage pool (IASP).</li>
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</ul>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="createdisfile.htm" title="This topic provides information about creating a distributed physical file by using the Create Physical File (CRTPF) command or the SQL CREATE TABLE statement.">Create Physical File (CRTPF) command and SQL CREATE TABLE statement</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="createdisfile.htm" title="This topic provides information about creating a distributed physical file by using the Create Physical File (CRTPF) command or the SQL CREATE TABLE statement.">Create Physical File (CRTPF) command and SQL CREATE TABLE statement</a></div>
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</div>
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</div>
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</body>
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</html>
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