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<H1>double hashing</H1>
<P>
(algorithm)

<P>
<strong>Definition:</strong>
An <a href="array.html" tppabs="http://hissa.nist.gov/dads/HTML/array.html"><em>array</em></a> which is indexed by a <a href="hash.html" tppabs="http://hissa.nist.gov/dads/HTML/hash.html"><em>hash</em></a> function.  Upon insertion if an item's hash value is already occupied (a <a href="collision.html" tppabs="http://hissa.nist.gov/dads/HTML/collision.html"><em>collision</em></a>), the array is searched for an empty place at intervals given by a different hash function, thus minimizing <a href="clustering.html" tppabs="http://hissa.nist.gov/dads/HTML/clustering.html"><em>clustering</em></a>.
<P><strong>See also</strong>
<a href="linearprobng.html" tppabs="http://hissa.nist.gov/dads/HTML/linearprobng.html"><em>linear probing</em></a>, <a href="hashtab.html" tppabs="http://hissa.nist.gov/dads/HTML/hashtab.html"><em>hash table</em></a>.
<P><em>Note:
Since a different hashing function is used to find a location in case of collision, colliding values should be spread out.  In <a href="linearprobng.html" tppabs="http://hissa.nist.gov/dads/HTML/linearprobng.html"><em>linear probing</em></a>, <a href="primaryclstr.html" tppabs="http://hissa.nist.gov/dads/HTML/primaryclstr.html"><em>primary clustering</em></a> occurs when collisions fill up every space for long stretches.  Even in <a href="quadraticprb.html" tppabs="http://hissa.nist.gov/dads/HTML/quadraticprb.html"><em>quadratic probing</em></a>, <a href="secondaryclu.html" tppabs="http://hissa.nist.gov/dads/HTML/secondaryclu.html"><em>secondary clustering</em></a> may develop since colliding values follow the same probe sequence.</em>
<P>Author: <a href="terms.html#authorPEB" tppabs="http://hissa.nist.gov/dads/terms.html#authorPEB">PEB</a>
<H2>Implementation</H2>
<A HREF="javascript:if(confirm('http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.dcc.uchile.cl/%7Eoalonso/handbook/algs/3/335.ins.c.html  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.dcc.uchile.cl/%7Eoalonso/handbook/algs/3/335.ins.c.html'" tppabs="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.dcc.uchile.cl/%7Eoalonso/handbook/algs/3/335.ins.c.html">insert (C and Pascal)</A>, <A HREF="javascript:if(confirm('http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.dcc.uchile.cl/%7Eoalonso/handbook/algs/3/335.srch.c.html  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.dcc.uchile.cl/%7Eoalonso/handbook/algs/3/335.srch.c.html'" tppabs="http://www.nist.gov/cgi-bin/exit_nist.cgi?url=http://www.dcc.uchile.cl/%7Eoalonso/handbook/algs/3/335.srch.c.html">search (C and Pascal)</A>

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Entry modified Fri Jan 14 15:37:42 2000.<BR>
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