80 lines
5.7 KiB
HTML
80 lines
5.7 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2005" />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Open considerations for files shared in a job" />
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<meta name="abstract" content="There are certain points to consider when you open a shared file in the same job by specifying SHARE(*YES)." />
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<meta name="description" content="There are certain points to consider when you open a shared file in the same job by specifying SHARE(*YES)." />
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<meta name="DC.subject" content="job, shared files in, open considerations, sharing file, open processing, restriction, sharing files in same job, SHARE parameter, parameter, share, in same job, when not possible, *NO value, sharing file, library list, sharing files, override command" />
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<meta name="keywords" content="job, shared files in, open considerations, sharing file, open processing, restriction, sharing files in same job, SHARE parameter, parameter, share, in same job, when not possible, *NO value, sharing file, library list, sharing files, override command" />
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<meta name="DC.Relation" scheme="URI" content="rbal3share.htm" />
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<title>Open considerations for files shared in a job</title>
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</head>
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<body id="rbal3openc"><a name="rbal3openc"><!-- --></a>
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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">Open considerations for files shared in a job</h1>
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<div><p>There are certain points to consider when you open
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a shared file in the same job by specifying SHARE(*YES).</p>
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<ul><li>You must make sure that when the shared file is opened for the first time
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in a job, all the open options that are needed for subsequent opens of the
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file are specified. If the open options specified for subsequent opens of
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a shared file do not match those specified for the first open of a shared
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file, an error message is sent to the program. (You can correct this by making
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changes to your program to remove any incompatible options.) <p>For example,
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PGMA is the first program to open FILE1 in the job and PGMA only needs to
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read the file. However, PGMA calls PGMB which will delete records from the
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same shared file. Because PGMB will delete records from the shared file,
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PGMA must open the file as if it, PGMA, is also going to delete records. You can accomplish this by using the correct specifications in the high-level
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language. (In order to accomplish this in some high-level languages, you might
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need to use file operation statements that are never run. See your appropriate
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language information for more details.)</p>
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</li>
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<li>Sometimes sharing a file within a job is not possible. For example, one
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program might need records from a file in arrival sequence, and another program
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might need the records in keyed sequence. Or, you might use the same file for
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printing output, but want to produce the output from each program separately. In these situations, you should not share the open data path. You would
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specify SHARE(*NO) on the override command to ensure that programs do not
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share the file within the job.</li>
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<li>If debug mode is entered with UPDPROD(*NO) after the first open of a shared
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file in a production library, subsequent shared opens of the file share the
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original open data path and allow the file to be changed. To prevent this,
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specify SHARE(*NO) on the OVERRIDE command before opening files while debugging
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your program.</li>
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<li>The use of commitment control for the first open of a shared file, requires
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that all subsequent shared opens also use commitment control.</li>
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<li>If you did not specify a library name in the program or the OVERRIDE command
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(*LIBL is used), the server assumes that the library list has not changed
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since the last open of the same shared file with *LIBL specified. If the
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library list has changed, you should specify the library name on the OVERRIDE
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command to ensure that you opened the correct file.</li>
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<li>The server processes overrides and program specifications that are specified
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on the first open of the shared file. Overrides and program specifications
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specified on subsequent opens, other than those that change the file name
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or the value specified on the SHARE or LVLCHK parameters on the OVERRIDE command,
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are ignored.</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="rbal3share.htm" title="File management on iSeries provides several levels of support for shared files. Files can be shared among many users, many jobs, or many programs within the same job.">Share files</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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