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<title>Save-while-active object locking rules</title>
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<h1 class="topictitle1">Save-while-active object locking rules</h1>
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<div><div class="section"><p>The object locking rules that the server uses for save-while-active
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requests are less restrictive than the rules it uses for other save operations.
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These object locking rules allow users to perform update operations and use
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most object-level commands after the server performs checkpoint processing.
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Generally, the server keeps a shared, no update (*SHRNUP) lock on the objects
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through the checkpoint processing. After the establishes checkpoints, the
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server unlocks most of the objects. Other objects remain allocated with a
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shared for read (*SHRRD) lock.</p>
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</div>
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<div class="section"><div class="p">The following table shows the locks a normal save operation holds,
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by a save-while-active operation during checkpoint processing, and by a save-while-active
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operation after checkpoint processing is complete.
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<div class="tablenoborder"><a name="rzaiu319__savlock"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="rzaiu319__savlock" width="100%" frame="hsides" border="0" rules="none"><caption>Table 1. Lock Type Needed for Save Operation</caption><thead align="left"><tr><th valign="top" width="39.963833634719705%" id="d0e29"> </th>
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<th valign="top" width="20.07233273056058%" id="d0e30"> </th>
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<th colspan="2" align="center" valign="bottom" id="d0e31">Save-While-Active</th>
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</tr>
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<tr><th align="left" valign="bottom" width="39.963833634719705%" id="d0e34">Object Type</th>
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<th align="left" valign="bottom" width="20.07233273056058%" id="d0e36">SAVACT(*NO)</th>
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<th align="left" valign="bottom" width="20.07233273056058%" id="d0e38">Establish Checkpoint</th>
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<th align="left" valign="bottom" width="19.89150090415913%" id="d0e40">After Checkpoint</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="39.963833634719705%" headers="d0e29 d0e34 ">Most object types</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e30 d0e36 ">*SHRNUP</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e31 d0e38 ">*SHRNUP</td>
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<td align="left" valign="top" width="19.89150090415913%" headers="d0e31 d0e40 ">None</td>
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</tr>
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<tr><td align="left" valign="top" width="39.963833634719705%" headers="d0e29 d0e34 ">Configuration object</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e30 d0e36 ">None</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e31 d0e38 "><sup>1</sup></td>
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<td align="left" valign="top" width="19.89150090415913%" headers="d0e31 d0e40 "><sup>1</sup></td>
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</tr>
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<tr><td align="left" valign="top" width="39.963833634719705%" headers="d0e29 d0e34 ">Data area</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e30 d0e36 ">*SHRNUP</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e31 d0e38 ">*SHRRD</td>
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<td align="left" valign="top" width="19.89150090415913%" headers="d0e31 d0e40 ">None</td>
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</tr>
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<tr><td align="left" valign="top" width="39.963833634719705%" headers="d0e29 d0e34 ">Database members</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e30 d0e36 ">*SHRNUP</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e31 d0e38 ">*SHRRD</td>
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<td align="left" valign="top" width="19.89150090415913%" headers="d0e31 d0e40 ">None</td>
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</tr>
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<tr><td align="left" valign="top" width="39.963833634719705%" headers="d0e29 d0e34 ">Document</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e30 d0e36 ">*SHRNUP</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e31 d0e38 ">*SHRRD</td>
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<td align="left" valign="top" width="19.89150090415913%" headers="d0e31 d0e40 ">None</td>
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</tr>
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<tr><td align="left" valign="top" width="39.963833634719705%" headers="d0e29 d0e34 ">Folder</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e30 d0e36 ">*SHRRD</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e31 d0e38 ">*SHRRD</td>
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<td align="left" valign="top" width="19.89150090415913%" headers="d0e31 d0e40 ">None</td>
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</tr>
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<tr><td align="left" valign="top" width="39.963833634719705%" headers="d0e29 d0e34 ">Job queue</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e30 d0e36 ">*SHRRD</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e31 d0e38 ">*SHRRD</td>
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<td align="left" valign="top" width="19.89150090415913%" headers="d0e31 d0e40 ">None</td>
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</tr>
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<tr><td align="left" valign="top" width="39.963833634719705%" headers="d0e29 d0e34 ">Journal</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e30 d0e36 ">*SHRRD</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e31 d0e38 ">*SHRRD</td>
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<td align="left" valign="top" width="19.89150090415913%" headers="d0e31 d0e40 ">None</td>
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</tr>
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<tr><td align="left" valign="top" width="39.963833634719705%" headers="d0e29 d0e34 ">Journal receiver</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e30 d0e36 ">*SHRRD</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e31 d0e38 ">*SHRRD</td>
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<td align="left" valign="top" width="19.89150090415913%" headers="d0e31 d0e40 ">*SHRRD</td>
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</tr>
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<tr><td align="left" valign="top" width="39.963833634719705%" headers="d0e29 d0e34 ">Library, when the library or an object in
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it is being saved</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e30 d0e36 ">*SHRUPD</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e31 d0e38 ">*SHRUPD</td>
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<td align="left" valign="top" width="19.89150090415913%" headers="d0e31 d0e40 ">*SHRRD</td>
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</tr>
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<tr><td align="left" valign="top" width="39.963833634719705%" headers="d0e29 d0e34 ">Output queue</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e30 d0e36 ">*SHRRD</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e31 d0e38 ">*SHRRD</td>
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<td align="left" valign="top" width="19.89150090415913%" headers="d0e31 d0e40 ">None</td>
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</tr>
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<tr><td align="left" valign="top" width="39.963833634719705%" headers="d0e29 d0e34 ">Product load</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e30 d0e36 ">*SHRNUP</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e31 d0e38 ">*SHRNUP</td>
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<td align="left" valign="top" width="19.89150090415913%" headers="d0e31 d0e40 ">*SHRRD</td>
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</tr>
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<tr><td align="left" valign="top" width="39.963833634719705%" headers="d0e29 d0e34 ">System resource management object</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e30 d0e36 ">*SHRNUP</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e31 d0e38 "><sup>1</sup></td>
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<td align="left" valign="top" width="19.89150090415913%" headers="d0e31 d0e40 "><sup>1</sup></td>
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</tr>
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<tr><td align="left" valign="top" width="39.963833634719705%" headers="d0e29 d0e34 ">User profiles, authorization lists, and authority
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holders</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e30 d0e36 ">*SHRRD</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e31 d0e38 "><sup>1</sup></td>
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<td align="left" valign="top" width="19.89150090415913%" headers="d0e31 d0e40 "><sup>1</sup></td>
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</tr>
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<tr><td align="left" valign="top" width="39.963833634719705%" headers="d0e29 d0e34 ">Object, if STG(*FREE) is specified</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e30 d0e36 ">*EXCL<sup>2</sup></td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e31 d0e38 "><sup>1</sup></td>
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<td align="left" valign="top" width="19.89150090415913%" headers="d0e31 d0e40 "><sup>1</sup></td>
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</tr>
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<tr><td align="left" valign="top" width="39.963833634719705%" headers="d0e29 d0e34 ">Objects in directories</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e30 d0e36 ">Share with readers</td>
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<td align="left" valign="top" width="20.07233273056058%" headers="d0e31 d0e38 ">Share with readers<sup>3, 4</sup></td>
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<td align="left" valign="top" width="19.89150090415913%" headers="d0e31 d0e40 ">Share with readers and writers<sup>3</sup></td>
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</tr>
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<tr><td colspan="4" align="left" valign="top" headers="d0e29 d0e30 d0e31 d0e34 d0e36 d0e38 d0e40 "> <dl><dt class="dlterm"><sup>1</sup></dt>
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<dd>The save-while-active function is not available when saving these objects.</dd>
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<dt class="dlterm"><sup>2</sup></dt>
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<dd>Applies to document, file, journal receiver, module, program, SQL package,
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and service program. Other types remain as listed previously.</dd>
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<dt class="dlterm"><sup>3</sup></dt>
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<dd>Objects in QNTC are not synchronized with SAVACT(*SYNC). Furthermore,
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all locks for these file systems will be released before the checkpoint message
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is sent.</dd>
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<dt class="dlterm"><sup>4</sup></dt>
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<dd>Objects that are saved with SAVACTOPT(*ALWCKPWRT) and have the QP0L_ATTR_ALWCKPWRT
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system attribute set, have an implied <em>share with readers and writers</em> lock.</dd>
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</dl>
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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>
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</div>
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<div class="section"><p>These locking rules pertain to object-level locks and not database
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record-level locks. The locking rules allow the opening and closing of database
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file members and any record-level I/O operations to database file members
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during any phase of the save-while-active operation.</p>
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</div>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzaiurzaiu320.htm">Object locking: During save-while-active checkpoint processing</a></strong><br />
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</li>
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<li class="ulchildlink"><strong><a href="rzaiurzaiu321.htm">Object locking: After save-while-active checkpoint processing</a></strong><br />
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</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaiuswaconsid.htm">Considerations and restrictions for the save-while-active function</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="rzaiurzaiu314.htm">Save-while-active restrictions</a></div>
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</div>
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</div>
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