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18          <th colspan="3" align="center">Performance Tuning</th>
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36      <p>
37            From a performance perspective, the use of transactions is not free.
38            Depending on how you configure them, transaction commits
39            usually require your application to perform disk I/O that a non-transactional
40            application does not perform. Also, for multi-threaded
41            <span>and
42            multi-process</span> applications, the use of transactions can
43            result in increased lock contention due to extra locking
44            requirements driven by transactional isolation guarantees.
45        </p>
46      <p>
47            There is therefore a performance tuning component to transactional applications 
48            that is not applicable for non-transactional applications (although
49            some tuning considerations do exist whether or not your application uses
50            transactions). Where appropriate, these tuning considerations are
51            introduced in the following chapters. 
52            
53            <span>
54            However, for a more complete description of them, see the
55            <a class="ulink" href="http://www.oracle.com/technology/documentation/berkeley-db/db/ref/transapp/tune.html" target="_top">
56            Transaction tuning
57            </a>
58            and 
59            <a class="ulink" href="http://www.oracle.com/technology/documentation/berkeley-db/db/ref/transapp/throughput.html" target="_top">
60            Transaction throughput
61            </a>
62            sections of the <em class="citetitle">Berkeley DB Programmer's Reference Guide</em>.
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