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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="introduction-ideas-transactionid"></a>Transaction IDs</h2></div></div></div>
<p>
      A <code class="literal">transaction_id</code> is a unique identifier that
      identifies the present or past transaction.
      A transaction is made up of one or more sub-transactions.
      A transaction has one <code class="literal">role</code> for the entire lifetime,
      but the transaction can different values of <code class="literal">status</code>
      as the transaction is processed.
    </p>
<p>
      For example, if the user "Installed OpenOffice" and the backend has to:
    </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>
          update libxml2 as a dependency
        </p></li>
<li class="listitem"><p>
          install java as dependency
        </p></li>
<li class="listitem"><p>
          install openoffice-bin
        </p></li>
<li class="listitem"><p>
          install openoffice-clipart
        </p></li>
</ul></div>
<p>
      This is one single transaction with the role <code class="literal">install</code>,
      with 4 different sub-transactions.
      This allows the user to rollback transactions with selected backends,
      rather than select sub-transactions which may need complex conflict
      resolution.
    </p>
<p>
      The <code class="literal">transaction_id</code> must be of the format
      <code class="literal">/job_identifier_data</code> where the daemon controls
      all parameters.
      <code class="literal">job</code> is a monotonically updating number and is
      retained over reboots.
      <code class="literal">identifier</code> is random data used by the daemon to
      ensure jobs started in parallel cannot race, and also to make a
      malicious client program harder to write.
      <code class="literal">data</code> can be used for ref-counting in the backend or
      for any other purpose.
      It is designed to make the life of a backend writer a little bit easier.
      An example <code class="literal">transaction_id</code> would be
      <code class="literal">/45_dafeca_checkpoint32</code>
    </p>
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