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      <div class="title_refTopic" id="xps10_pagetitle">DBUPDATE </div>
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      <h4 class="refClassification">Specify Database Directory Update Interval </h4>
      <p class="para_refTopic">Specifies the maximum length of CPU time between database directory updates to the MASTER DBset.  This statement is intended to be used if the INIT MASTER(RAM=r) option is specified. </p>
      <div class="title_refCategory">Format: </div>
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         <p class="para_refCategory">DBUPDATE [=] update-time </p>
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      <div class="title_refCategory">Describers:</div>
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                     <p class="para_th"><b class="uiTerm">Describer </b></p>
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                     <p class="para_th"><b class="uiTerm">Meaning </b></p>
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                     <p class="para_td">update-time </p>
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                     <p class="para_td">CPU time interval in minutes (real or integer) between database directory updates. </p>
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      <div class="title_refCategory">Remarks: </div>
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               <p class="para_item">The difference in CPU time from the last update is checked after the execution of each DMAP instruction.  The database directory is updated if this difference is greater than update-time.  Update-time and CPU time are accurate to the nearest whole second only. </p>
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               <p class="para_item">If update-time &lt; 0, then database directory updates are only performed at the end of the run. </p>
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               <p class="para_item">Defaults for update-time are machine dependent and may be found in the <a class="links" href="javascript:void(0)" onclick="top.popUpPage('cog/index.html?goto=cog/01topic_1.html&vars=-aux,-home','linkInter','menubar=yes,status=yes,resizable=yes,toolbar=yes,scrollbars=yes,location=no,directories=no');return(false);"><em>NX Nastran Installation and Operations Guide</em>. </a></p>
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               <p class="para_item">Periodic updates of the directory tables to MASTER DBset increase the integrity of the database during system crashes (for example, crashes due to insufficient time or space). </p>
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               <p class="para_item">In addition to those specified by DBUPDATE, directory updates are performed automatically at various points in the execution of the DMAP.  An asterisk appears after the word &ldquo;BEGN&rdquo; in the Executive Summary Table whenever an update occurs. These updates occur whenever a permanent data block or parameter DMAP equivalence or restart equivalence is broken.  Updates also occur upon deletions.  Additions to the database do not automatically cause a directory update to take place. </p>
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               <p class="para_item">This statement is in effect only when INIT MASTER(RAM=r) is being used.  INIT MASTER(S) and INIT MASTER(NORAM) disable periodic and automatic updates. </p>
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               <p class="para_item">Update-time may also be changed with the DMAP instruction PUTSYS(update-time, 128) or the NASTRAN SYSTEM(128)=update-time statement.  (The update-time must be a real, single-precision value specified in minutes.) </p>
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      <div class="title_refCategory">Examples: </div>
      <div class="refCategoryContent"><pre class="indent">DBUPDATE=5.5</pre><p class="para_refCategory">The above example would call for a database directory update at the end of a DMAP module execution, after five and one-half minutes of CPU time have elapsed from the last update. </p>
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