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<h1 id="locking-mechanism">Locking Mechanism<a class="headerlink" href="#locking-mechanism" title="Permanent link">&para;</a></h1>
<p>In any multi-user application a locking mechanism is necessary to avoid conflicts when the same table is updated by two people or processes. In Data Controller this is handled using the <code>DCLIB.MPE_LOCKANYTABLE</code> table, specifically using the <a href="https://core.sasjs.io/mp__lockanytable_8sas.html">mp_lockanytable</a> macro.</p>
<p>This macro is invoked whenever a process requires an exclusive lock on a table - first to mark the table as locked, and again to mark it as unlocked. The logic flow is demonstrated below:</p>
<p><img alt="lockanytable logic" src="/img/locking-mechanism.drawio.png" /></p>
<p>Notice above the red box - this situation can occur in unusual circumstances (such as a system shutdown or OS error). If you are waiting more than a minute or two for a table to be unlocked, then it is advised to follow the process below.</p>
<h2 id="unlock-process">Unlock Process<a class="headerlink" href="#unlock-process" title="Permanent link">&para;</a></h2>
<p>Before proceeding with an unlock, the first step should be to understand why the process is locked. By opening the <a href="/tables/mpe_lockanytable/">MPE_LOCKANYTABLE</a> table it will be possible to see which user performed the lock, and when. Simply filter the table where <code>LOCK_STATUS_CD='LOCKED'</code>.</p>
<p><img alt="" src="/img/mpe_lockanytable.png" /></p>
<p>If an unlock is deemed necessary, simply open this table in the EDIT menu, and change the value of <code>LOCK_STATUS_CD</code> from <code>LOCKED</code> to <code>UNLOCKED</code>.</p>
<h2 id="scalability">Scalability<a class="headerlink" href="#scalability" title="Permanent link">&para;</a></h2>
<p>This locking mechanism does not scale well if the table remains in SAS dataset (.sas7bdat) form. If you are deploying Data Controller for usage beyond 10-20 users then you are advised to put the control tables (DC library) in a database.</p>
<h2 id="third-party-applications">Third Party Applications<a class="headerlink" href="#third-party-applications" title="Permanent link">&para;</a></h2>
<p>Third party SAS apps may also make use of this locking table. This is handled by simply:</p>
<ol>
<li>Ensuring the DC library is assigned in the Service</li>
<li>Using the <a href="https://core.sasjs.io/mp__lockanytable_8sas.html">mp_lockanytable</a> macro to perform the lock</li>
<li>Using the <a href="https://core.sasjs.io/mp__lockanytable_8sas.html">mp_lockanytable</a> macro to perform the unlock</li>
<li>Performing appropriate error handling to ensure an unlock if there are any issues in the service</li>
</ol>
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