386 lines
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386 lines
26 KiB
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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">Database lock considerations</h1>
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<div><p>Listed here are the commonly used database functions and the types
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of locks they place on database files.</p>
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<div class="section"><p><a href="#rbafoapplck__rbafotest">Table 1</a> summarizes some of
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the most commonly used database functions and the types of locks they place
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on database files. The types of locks are explained on the next page. </p>
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</div>
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<div class="tablenoborder"><a name="rbafoapplck__rbafotest"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="rbafoapplck__rbafotest" width="100%" frame="hsides" border="0" rules="none"><caption>Table 1. Database functions
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and locks</caption><thead align="left"><tr><th align="left" valign="top" width="19.94949494949495%" id="d0e41">Function</th>
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<th align="left" valign="top" width="19.94949494949495%" id="d0e43">Command</th>
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<th align="left" valign="top" width="19.94949494949495%" id="d0e45">File Lock</th>
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<th align="left" valign="top" width="19.94949494949495%" id="d0e47">Member/Data Lock</th>
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<th align="left" valign="top" width="20.2020202020202%" id="d0e49">Access Path Lock</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Add Member</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">ADDPFM, ADDLFM</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*EXCLRD</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 "> </td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 ">*EXCLRD</td>
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</tr>
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<tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Change File Attributes</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">CHGPF, CHGLF</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*EXCL</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 ">*EXCLRD</td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 ">*EXCLRD</td>
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</tr>
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<tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Change Member Attributes</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">CHGPFM, CHGLFM</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*SHRRD</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 ">*EXCLRD</td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Change Object Owner</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">CHGOBJOWN</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*EXCL</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 "> </td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Check Object</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">CHKOBJ</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*SHRNUPD</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 "> </td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Clear Physical File Member</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">CLRPFM</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*SHRRD</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 ">*EXCLRD<sup>3</sup></td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Create Duplicate Object</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">CRTDUPOBJ</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*EXCL (new object) *SHRNUPD (object)</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 "> </td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Create File</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">CRTPF, CRTLF, CRTSRCPF</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*EXCL</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 "> </td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Delete File</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">DLTF</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*EXCL</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 "> </td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 ">*EXCLRD</td>
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</tr>
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<tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Grant/Revoke Authority</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">GRTOBJAUT, RVKOBJAUT</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*EXCL</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 "> </td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Initialize Physical File Member</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">INZPFM</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*SHRRD</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 ">*EXCLRD</td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Move Object</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">MOVOBJ</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*EXCL</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 "> </td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Open File</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">OPNDBF, OPNQRYF</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*SHRRD</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 ">*SHRRD</td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 ">*EXCLRD</td>
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</tr>
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<tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Rebuild Access Path</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">EDTRBDAP, OPNDBF</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*SHRRD</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 ">*SHRRD</td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 ">*EXCLRD</td>
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</tr>
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<tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Remove Member</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">RMVM</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*EXCLRD</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 ">*EXCL</td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 ">*EXCLRD</td>
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</tr>
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<tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Rename File</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">RNMOBJ</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*EXCL</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 ">*EXCL</td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 ">*EXCL</td>
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</tr>
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<tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Rename Member</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">RNMM</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*EXCLRD</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 ">*EXCL</td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 ">*EXCL</td>
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</tr>
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<tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Reorganize Physical File Member</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">RGZPFM</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*SHRRD</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 ">*EXCL<sup>4</sup></td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Restore File</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">RSTLIB, RSTOBJ</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*EXCL</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 "> </td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="19.94949494949495%" headers="d0e41 ">Save File</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e43 ">SAVLIB, SAVOBJ, SAVCHGOBJ</td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e45 ">*SHRNUPD<sup>1</sup></td>
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<td align="left" valign="top" width="19.94949494949495%" headers="d0e47 ">*SHRNUPD<sup>2</sup></td>
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<td align="left" valign="top" width="20.2020202020202%" headers="d0e49 "> </td>
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</tr>
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<tr><td colspan="5" align="left" valign="top" headers="d0e41 d0e43 d0e45 d0e47 d0e49 "><p><sup>1</sup> For
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save-while-active, the file lock is *SHRUPD initially, and then the lock is
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reduced to *SHRRD. See the <a href="../books/sc415304.pdf" target="_blank">Backup and Recovery</a> <img src="wbpdf.gif" alt="Link to PDF" /> for a description of save-while-active locks for
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the save commands.</p>
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<p><sup>2</sup> For save-while-active, the member/data
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lock is *SHRRD.</p>
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<p><sup>3</sup> The clear operation does not happen if
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the member is open in this process or in any other process.</p>
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<p><sup>4</sup> If
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ALWCANCEL(*YES) is specified, the LOCK keyword can specify a *SHRUPD or *EXCLRD
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lock instead.</p>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section"><p>The following table shows the valid lock combinations: </p>
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</div>
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<table cellpadding="4" cellspacing="0" border="1" class="tableborder"><tr><td>
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<table cellpadding="4" cellspacing="0" summary="" width="100%" border="0"><thead align="left"><tr><th align="left" valign="bottom" width="16.666666666666664%" id="d0e316">Lock</th>
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<th align="center" valign="bottom" width="16.666666666666664%" id="d0e318">*EXCL</th>
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<th align="center" valign="bottom" width="16.666666666666664%" id="d0e320">*EXCLRD</th>
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<th align="center" valign="bottom" width="16.666666666666664%" id="d0e322">*SHRUPD</th>
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<th align="center" valign="bottom" width="16.666666666666664%" id="d0e324">*SHRNUPD</th>
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<th align="center" valign="bottom" width="16.666666666666664%" id="d0e326">*SHRRD</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="16.666666666666664%" headers="d0e316 ">*EXCL<sup>1</sup></td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e318 "> </td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e320 "> </td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e322 "> </td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e324 "> </td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e326 "> </td>
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</tr>
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<tr><td align="left" valign="top" width="16.666666666666664%" headers="d0e316 ">*EXCLRD<sup>2</sup></td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e318 "> </td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e320 "> </td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e322 "> </td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e324 "> </td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e326 ">X</td>
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</tr>
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<tr><td align="left" valign="top" width="16.666666666666664%" headers="d0e316 ">*SHRUPD<sup>3</sup></td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e318 "> </td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e320 "> </td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e322 ">X</td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e324 "> </td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e326 ">X</td>
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</tr>
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<tr><td align="left" valign="top" width="16.666666666666664%" headers="d0e316 ">*SHRNUPD<sup>4</sup></td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e318 "> </td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e320 "> </td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e322 "> </td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e324 ">X</td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e326 ">X</td>
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</tr>
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<tr><td align="left" valign="top" width="16.666666666666664%" headers="d0e316 ">*SHRRD<sup>5</sup></td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e318 "> </td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e320 ">X</td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e322 ">X</td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e324 ">X</td>
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<td align="center" valign="top" width="16.666666666666664%" headers="d0e326 ">X</td>
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</tr>
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<tr><td colspan="6" align="left" valign="top" headers="d0e316 d0e318 d0e320 d0e322 d0e324 d0e326 "><p><sup>1</sup> Exclusive
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lock (*EXCL). The object is allocated for the exclusive use of the requesting
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job; no other job can use the object.</p>
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<p><sup>2</sup> Exclusive lock, allow
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read (*EXCLRD). The object is allocated to the job that requested it, but
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other jobs can read the object.</p>
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<p><sup>3</sup> Shared lock, allow read
|
||
and update (*SHRUPD). The object can be shared either for read or change with
|
||
other jobs.</p>
|
||
<p><sup>4</sup> Shared lock, read only (*SHRNUPD). The object
|
||
can be shared for read with other jobs.</p>
|
||
<p><sup>5</sup> Shared lock (*SHRRD).
|
||
The object can be shared with another job if the job does not request exclusive
|
||
use of the object.</p>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</td></tr></table>
|
||
<div class="section"><p><a href="#rbafoapplck__rbafocstlck">Table 2</a> shows database locking
|
||
for constraints of a database file, depending on whether the constraint is
|
||
associated with the parent file (PAR) or the dependent file (DEP).</p>
|
||
</div>
|
||
|
||
<div class="tablenoborder"><a name="rbafoapplck__rbafocstlck"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="rbafoapplck__rbafocstlck" width="100%" frame="void" border="0" rules="none"><caption>Table 2. Database constraint
|
||
locks. The numbers in parentheses refer to the notes at the end
|
||
of the table.</caption><thead align="left"><tr><th align="left" valign="bottom" width="22.62210796915167%" id="d0e445">Type of function</th>
|
||
<th align="left" valign="bottom" width="22.87917737789203%" id="d0e447">File type</th>
|
||
<th align="left" valign="bottom" width="13.624678663239074%" id="d0e449">File<sup>5</sup> </th>
|
||
<th align="left" valign="bottom" width="13.881748071979436%" id="d0e454">Member<sup>5</sup> </th>
|
||
<th align="left" valign="bottom" width="13.624678663239074%" id="d0e459">Other file</th>
|
||
<th align="left" valign="bottom" width="13.367609254498714%" id="d0e461">Other member</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody><tr><td align="left" valign="top" width="22.62210796915167%" headers="d0e445 ">ADDPFM<sup>1</sup> </td>
|
||
<td align="left" valign="top" width="22.87917737789203%" headers="d0e447 ">DEP</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e449 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.881748071979436%" headers="d0e454 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e459 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.367609254498714%" headers="d0e461 ">*EXCL</td>
|
||
</tr>
|
||
<tr><td align="left" valign="top" width="22.62210796915167%" headers="d0e445 ">ADDPFM<sup>1</sup> </td>
|
||
<td align="left" valign="top" width="22.87917737789203%" headers="d0e447 ">PAR</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e449 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.881748071979436%" headers="d0e454 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e459 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.367609254498714%" headers="d0e461 ">*EXCL</td>
|
||
</tr>
|
||
<tr><td align="left" valign="top" width="22.62210796915167%" headers="d0e445 ">ADDPFCST<sup>7</sup></td>
|
||
<td align="left" valign="top" width="22.87917737789203%" headers="d0e447 ">*REFCST</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e449 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.881748071979436%" headers="d0e454 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e459 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.367609254498714%" headers="d0e461 ">*EXCL</td>
|
||
</tr>
|
||
<tr><td align="left" valign="top" width="22.62210796915167%" headers="d0e445 ">ADDPFCST<sup>6</sup> </td>
|
||
<td align="left" valign="top" width="22.87917737789203%" headers="d0e447 ">*UNQCST *PRIKEY</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e449 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.881748071979436%" headers="d0e454 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e459 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.367609254498714%" headers="d0e461 ">*EXCL</td>
|
||
</tr>
|
||
<tr><td align="left" valign="top" width="22.62210796915167%" headers="d0e445 ">ADDPFCST</td>
|
||
<td align="left" valign="top" width="22.87917737789203%" headers="d0e447 ">*UNIQUE *PRIKEY</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e449 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.881748071979436%" headers="d0e454 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e459 "> </td>
|
||
<td align="left" valign="top" width="13.367609254498714%" headers="d0e461 "> </td>
|
||
</tr>
|
||
<tr><td align="left" valign="top" width="22.62210796915167%" headers="d0e445 ">RMVM<sup>2</sup></td>
|
||
<td align="left" valign="top" width="22.87917737789203%" headers="d0e447 ">DEP</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e449 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.881748071979436%" headers="d0e454 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e459 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.367609254498714%" headers="d0e461 ">*EXCL</td>
|
||
</tr>
|
||
<tr><td align="left" valign="top" width="22.62210796915167%" headers="d0e445 ">RMVM<sup>2</sup></td>
|
||
<td align="left" valign="top" width="22.87917737789203%" headers="d0e447 ">PAR</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e449 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.881748071979436%" headers="d0e454 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e459 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.367609254498714%" headers="d0e461 ">*EXCL</td>
|
||
</tr>
|
||
<tr><td align="left" valign="top" width="22.62210796915167%" headers="d0e445 ">DLTF<sup>3</sup></td>
|
||
<td align="left" valign="top" width="22.87917737789203%" headers="d0e447 ">DEP</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e449 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.881748071979436%" headers="d0e454 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e459 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.367609254498714%" headers="d0e461 ">*EXCL</td>
|
||
</tr>
|
||
<tr><td align="left" valign="top" width="22.62210796915167%" headers="d0e445 ">DLTF<sup>3</sup></td>
|
||
<td align="left" valign="top" width="22.87917737789203%" headers="d0e447 ">PAR</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e449 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.881748071979436%" headers="d0e454 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e459 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.367609254498714%" headers="d0e461 ">*EXCL</td>
|
||
</tr>
|
||
<tr><td align="left" valign="top" width="22.62210796915167%" headers="d0e445 ">RMVPFCST<sup>7</sup></td>
|
||
<td align="left" valign="top" width="22.87917737789203%" headers="d0e447 ">*REFCST</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e449 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.881748071979436%" headers="d0e454 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e459 ">*EXCL<sup>4</sup></td>
|
||
<td align="left" valign="top" width="13.367609254498714%" headers="d0e461 ">*EXCL</td>
|
||
</tr>
|
||
<tr><td align="left" valign="top" width="22.62210796915167%" headers="d0e445 ">RMVPFCST<sup>6</sup></td>
|
||
<td align="left" valign="top" width="22.87917737789203%" headers="d0e447 ">*UNQCST *PRIKEY</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e449 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.881748071979436%" headers="d0e454 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e459 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.367609254498714%" headers="d0e461 ">*EXCL</td>
|
||
</tr>
|
||
<tr><td align="left" valign="top" width="22.62210796915167%" headers="d0e445 ">RMVPFCST</td>
|
||
<td align="left" valign="top" width="22.87917737789203%" headers="d0e447 ">*UNIQUE *PRIKEY</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e449 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.881748071979436%" headers="d0e454 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e459 "> </td>
|
||
<td align="left" valign="top" width="13.367609254498714%" headers="d0e461 "> </td>
|
||
</tr>
|
||
<tr><td align="left" valign="top" width="22.62210796915167%" headers="d0e445 ">CHGPFCST</td>
|
||
<td align="left" valign="top" width="22.87917737789203%" headers="d0e447 "> </td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e449 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.881748071979436%" headers="d0e454 ">*EXCL</td>
|
||
<td align="left" valign="top" width="13.624678663239074%" headers="d0e459 ">*SHRRD</td>
|
||
<td align="left" valign="top" width="13.367609254498714%" headers="d0e461 ">*EXCL</td>
|
||
</tr>
|
||
<tr><td colspan="6" align="left" valign="top" headers="d0e445 d0e447 d0e449 d0e454 d0e459 d0e461 "><p><sup>1</sup> If
|
||
adding a physical file member causes a referential constraint to be established.</p>
|
||
<p><sup>2</sup> If
|
||
removing a physical file member causes an established referential constraint
|
||
to become defined.</p>
|
||
<p><sup>3</sup> When deleting a dependent or parent
|
||
file that has constraints established or defined for the file.</p>
|
||
<p><sup>4</sup> When
|
||
the Remove Physical File Constraint (RMVPFCST) command is invoked for the
|
||
parent file which has constraints established or defined, the parent and any
|
||
logical files over the parent file are all locked *EXCL.</p>
|
||
<p><sup>5</sup> For
|
||
referential constraints, the column refers to the dependent file or the dependent
|
||
member.</p>
|
||
<p><sup>6</sup> Unique constraint or primary key constraint is
|
||
a parent key in a referential constraint where the other file is a dependent
|
||
file.</p>
|
||
<p><sup>7</sup> The other file is a parent file.</p>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</div>
|
||
</div>
|
||
<div>
|
||
<div class="familylinks">
|
||
<div class="parentlink"><strong>Parent topic:</strong> <a href="rbafoconcc.htm" title="By definition, all database files can be used by many users at the same time. However, some operations can lock the file, member, or data records in a member to prevent them from being shared across jobs.">Lock shared data</a></div>
|
||
</div>
|
||
</div>
|
||
</body>
|
||
</html> |