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<h1>9. SQL Procedure Language Guide</h1>
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<h2>9.13. Performance Tips</h2>
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<h3>9.13.1. Remember the following:</h3>
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<p>Reference parameters (inout and out) are faster then value parameters (in).</p>
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<p>Use cursors and positioned delete/update (where current of) for read-modify transactions instead of a select .. into and searched update.</p>
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<p>Make an EXCLUSIVE read in read-modify transactions.</p>
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<p>When using ORDER BY and wishing to use a particular index, specify ALL
key parts of the index, including those that have a '=' condition. If you
want to have descending order using an index, specify DESC on ALL key parts.
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