PAL.C.T MINI SHELL

PAL.C.T MINI SHELL

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>Chapter 52. GIN Indexes</TD
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><P
>   <ACRONYM
CLASS="ACRONYM"
>GIN</ACRONYM
> stands for Generalized Inverted Index.  It is
   an index structure storing a set of (key, posting list) pairs, where
   a <SPAN
CLASS="QUOTE"
>"posting list"</SPAN
> is a set of rows in which the key occurs. Each
   indexed value can contain many keys, so the same row ID can appear in
   multiple posting lists.
 </P
><P
>   It is generalized in the sense that a <ACRONYM
CLASS="ACRONYM"
>GIN</ACRONYM
> index
   does not need to be aware of the operation that it accelerates.
   Instead, it uses custom strategies defined for particular data types.
 </P
><P
>  One advantage of <ACRONYM
CLASS="ACRONYM"
>GIN</ACRONYM
> is that it allows the development
  of custom data types with the appropriate access methods, by
  an expert in the domain of the data type, rather than a database expert.
  This is much the same advantage as using <ACRONYM
CLASS="ACRONYM"
>GiST</ACRONYM
>.
 </P
><P
>  The <ACRONYM
CLASS="ACRONYM"
>GIN</ACRONYM
>
  implementation in <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> is primarily
  maintained by Teodor Sigaev and Oleg Bartunov. There is more
  information about <ACRONYM
CLASS="ACRONYM"
>GIN</ACRONYM
> on their
  <A
HREF="http://www.sai.msu.su/~megera/wiki/Gin"
TARGET="_top"
>website</A
>.
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