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> 3.3.9 reference manual: Full-featured search engine software</TH
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><H1
><A
NAME="cmdref-limit"
></A
>Limit</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN9969"
></A
><H2
>Name</H2
><B
CLASS="command"
>Limit</B
> -- describes a fast limit<P
><B
></B
><TT
CLASS="filename"
>indexer.conf</TT
></P
><P
><B
></B
><TT
CLASS="filename"
>search.htm</TT
></P
></DIV
><DIV
CLASS="refsynopsisdiv"
><A
NAME="AEN9977"
></A
><H2
>Synopsis</H2
><P
><B
CLASS="command"
>Limit</B
> {name} {sql}</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN9982"
></A
><H2
></H2
><P
> <B
CLASS="command"
>Limit</B
> describes an <ACRONYM
CLASS="acronym"
>SQL</ACRONYM
> query
returning a list of <ACRONYM
CLASS="acronym"
>URL</ACRONYM
> <CODE
CLASS="varname"
>IDs</CODE
> and
associates the list with the given name. The query is executed during execution
of <TT
CLASS="literal"
>indexer -Eblob</TT
>, <TT
CLASS="literal"
>indexer -Erewriteurl</TT
>
or <TT
CLASS="literal"
>indexer -Erewritelimits</TT
>
and its results are stored in the database in a compact way
which allows to fetch the limit during search time very efficiently.
</P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
Use the <CODE
CLASS="option"
>fl</CODE
> <SPAN
CLASS="application"
>search.cgi</SPAN
> parameter to load a previously created fast limit at search time.
</P
></BLOCKQUOTE
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
Starting from the version <TT
CLASS="literal"
>3.2.39</TT
>, it's also possible
to specify the <CODE
CLASS="option"
>fl</CODE
> parameter in the
<B
CLASS="command"
><A
HREF="msearch-cmdref-dbaddr.html"
>DBAddr</A
></B
>
command in <TT
CLASS="filename"
>search.htm</TT
>,
to set different limits for the databases listed in the template.
</P
></BLOCKQUOTE
></DIV
><P
> <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>Fast limits</I
></SPAN
> work much faster
than <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>section limits</I
></SPAN
> which are activated
by using the <CODE
CLASS="option"
>sl</CODE
> search parameter
described in <A
HREF="msearch-doingsearch.html#search-params"
>the Section called <I
>Search parameters
<A
NAME="AEN4440"
></A
></I
> in Chapter 10</A
>.
</P
><P
> Unlike <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>section limits</I
></SPAN
>, <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>fast limits</I
></SPAN
>
are suitable for huge databases and can use very complex <B
CLASS="command"
>WHERE</B
>
conditions, typically on the <CODE
CLASS="varname"
>url</CODE
>
and <CODE
CLASS="varname"
>urlinfo</CODE
> <SPAN
CLASS="application"
>mnoGoSearch</SPAN
> tables, but can also use joins with external tables.
</P
><P
> <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>Fast limits</I
></SPAN
> work only with the databases supporting
<CODE
CLASS="option"
>DBMode=blob</CODE
> (see <A
HREF="msearch-howstore.html#sql-stor-blob"
>the Section called <I
>Storage mode - blob
<A
NAME="AEN3342"
></A
></I
> in Chapter 7</A
>) and
reuse the <CODE
CLASS="varname"
>bdict</CODE
> table in the <SPAN
CLASS="application"
>mnoGoSearch</SPAN
> database,
however they are available for <CODE
CLASS="option"
>DBMode=single</CODE
> and
<CODE
CLASS="option"
>DBMode=multi</CODE
> as well.
</P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
If you use <CODE
CLASS="option"
>DBMode=single</CODE
> or <CODE
CLASS="option"
>DBMode=multi</CODE
>,
then run <TT
CLASS="literal"
>indexer -Erewritelimits</TT
>
to create or update <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>fast limits</I
></SPAN
> after indexing.
</P
></BLOCKQUOTE
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
If you use <CODE
CLASS="option"
>DBMode=blob</CODE
> then <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>fast limits</I
></SPAN
>
are recreated automatically
during execution of <TT
CLASS="literal"
>indexer -Eblob</TT
> or <TT
CLASS="literal"
>indexer -Erewriteurl</TT
>,
however you can still use <TT
CLASS="literal"
>indexer -Erewritelimits</TT
> for quick rewrite of
<SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>fast limits</I
></SPAN
> without touching other data.
</P
></BLOCKQUOTE
></DIV
><P
> Starting from the version <TT
CLASS="literal"
>3.2.39</TT
>, it is also possible
to specify the <B
CLASS="command"
>Limit</B
> command directly in <TT
CLASS="filename"
>search.htm</TT
>
without having to cache the desired limits using <KBD
CLASS="userinput"
>indexer -Eblob</KBD
>.
It can be useful for the limits whose <ACRONYM
CLASS="acronym"
>SQL</ACRONYM
> queries
work very efficiently and return a very small number of documents.
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN10043"
></A
><H2
>Examples</H2
><DIV
CLASS="informalexample"
><P
></P
><A
NAME="AEN10045"
></A
><PRE
CLASS="programlisting"
> Limit mod "SELECT rec_id FROM url WHERE url LIKE '%/mod/%'"
Limit html "SELECT url_id FROM urlinfo WHERE sname='Content-Type' AND sval='text/html'"
</PRE
><P
></P
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN10047"
></A
><H2
>See also</H2
><P
> <A
HREF="msearch-doingsearch.html#search-params"
>the Section called <I
>Search parameters
<A
NAME="AEN4440"
></A
></I
> in Chapter 10</A
>,
<A
HREF="msearch-howstore.html#sql-stor-blob"
>the Section called <I
>Storage mode - blob
<A
NAME="AEN3342"
></A
></I
> in Chapter 7</A
>,
<A
HREF="msearch-cmdref-dbaddr.html"
>DBAddr</A
>.
</P
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