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  17         <p>Library Version 11.2.5.3</p>
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  21           <th colspan="3" align="center">Performance Tuning</th>
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  35             <h2 class="title" style="clear: both"><a id="perftune-intro"></a>Performance Tuning</h2>
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  39       <p>
  40             From a performance perspective, the use of transactions is not free.
  41             Depending on how you configure them, transaction commits
  42             usually require your application to perform disk I/O that a non-transactional
  43             application does not perform. Also, for multi-threaded
  44             <span>and
  45             multi-process</span> applications, the use of transactions can
  46             result in increased lock contention due to extra locking
  47             requirements driven by transactional isolation guarantees.
  48         </p>
  49       <p>
  50             There is therefore a performance tuning component to transactional applications
  51             that is not applicable for non-transactional applications (although
  52             some tuning considerations do exist whether or not your application uses
  53             transactions). Where appropriate, these tuning considerations are
  54             introduced in the following chapters.
  55
  56             <span>
  57             However, for a more complete description of them, see the
  58             <a class="ulink" href="http://download.oracle.com/docs/cd/E17076_02/html/programmer_reference/transapp_tune.html" target="_top">
  59             Transaction tuning
  60             </a>
  61             and
  62             <a class="ulink" href="http://download.oracle.com/docs/cd/E17076_02/html/programmer_reference/transapp_throughput.html" target="_top">
  63             Transaction throughput
  64             </a>
  65             sections of the <em class="citetitle">Berkeley DB Programmer's Reference Guide</em>.
  66             </span>
  67
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