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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML
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CONTENT="shareware, freeware, download, internet, unix, utilities, search engine, text retrieval, knowledge retrieval, text search, information retrieval, database search, mining, intranet, webserver, index, spider, filesearch, meta, free, open source, full-text, udmsearch, website, find, opensource, search, searching, software, udmsearch, engine, indexing, system, web, ftp, http, cgi, php, SQL, MySQL, database, php3, FreeBSD, Linux, Unix, mnoGoSearch, MacOS X, Mac OS X, Windows, 2000, NT, 95, 98, GNU, GPL, url, grabbing"></HEAD
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>mnoGoSearch 3.3.7 reference manual: Full-featured search engine software</TH
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><HR
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><H1
><A
NAME="cmdref-limit"
></A
>Limit</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN6096"
></A
><H2
>Name</H2
>Limit -- describes a fast limit<P
><B
></B
><SPAN
CLASS="application"
>indexer.conf</SPAN
> <SPAN
CLASS="application"
>search.htm</SPAN
></P
></DIV
><DIV
CLASS="refsynopsisdiv"
><A
NAME="AEN6102"
></A
><H2
>Synopsis</H2
><P
><B
CLASS="command"
>Limit</B
> {name} {sql}</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN6107"
></A
><H2
></H2
><P
> This command describes an SQL query returning a list of URL IDs and
associates it 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 effeciently.
<DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
Use the "fl" search.cgi parameter to load a previously created fast limit at search time.
</P
></BLOCKQUOTE
></DIV
>
<DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
Since version 3.2.39, it's also possible to specify the "fl"
parameter in the "DBAddr" search.htm command, to set different
limits for the databases listed in the template.
</P
></BLOCKQUOTE
></DIV
>
The fast limits work much faster than the section limits, which use the "sl"
search.cgi parameter described in <A
HREF="msearch-doingsearch.html#search-params"
>the Section called <I
>Search parameters
<A
NAME="AEN2905"
></A
></I
> in Chapter 8</A
>.
Unlike the "sl" limits, the fast limits are suitable for huge databases
and can use very complex WHERE condition, typically on the "url"
or "urlinfo" mnoGoSearch tables, but can also use joins with external tables.
</P
><P
> The fast limits work only with the databases supporting DBMode=blob
(see <A
HREF="msearch-howstore.html#sql-stor-blob"
>the Section called <I
>Storage mode - blob
<A
NAME="AEN2002"
></A
></I
> in Chapter 5</A
>) and reuse the "bdict" SQL table,
however they are available for DBMode=single and DBMode=multi as well.
<DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
If you use DBMode=single or DBMode=multi, then execute <TT
CLASS="literal"
>indexer -Erewritelimits</TT
>
to create or recreate the fast limits after indexing.
</P
></BLOCKQUOTE
></DIV
>
<DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
If you use DBMode=blob then the fast limits 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
the fast limits without touching other data.
</P
></BLOCKQUOTE
></DIV
>
</P
><P
> Since 3.2.39, it is also possible to specify the "Limit" commands
directly in search.htm, without having to cache the desired limits
using "indexer -Eblob". It can be useful for those limits whose
SQL queries work very efficiently and return a very small
number of documents.
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN6129"
></A
><H2
>Examples</H2
><DIV
CLASS="informalexample"
><P
></P
><A
NAME="AEN6131"
></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="AEN6133"
></A
><H2
>See also</H2
><P
> <A
HREF="msearch-doingsearch.html#search-params"
>the Section called <I
>Search parameters
<A
NAME="AEN2905"
></A
></I
> in Chapter 8</A
>,
<A
HREF="msearch-howstore.html#sql-stor-blob"
>the Section called <I
>Storage mode - blob
<A
NAME="AEN2002"
></A
></I
> in Chapter 5</A
>,
<A
HREF="msearch-cmdref-dbaddr.html"
>DBAddr</A
>.
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