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<!-- Manpage converted by man2html 3.0.1 -->
<B><A HREF="dbclean.html">dbclean(8)</A></B>            Distributed Checksum Clearinghouse            <B><A HREF="dbclean.html">dbclean(8)</A></B>


</PRE>
<H2><A NAME="NAME">NAME</A></H2><PRE>
     <B>dbclean</B> -- Clean Distributed Checksum Clearinghouse Database


</PRE>
<H2><A NAME="SYNOPSIS">SYNOPSIS</A></H2><PRE>
     <B>dbclean</B> [<B>-dfFNPSVq</B>] [<B>-i</B> <I>id</I>] [<B>-a</B> [<I>server-addr</I>][<I>,port</I>]] [<B>-h</B> <I>homedir</I>]
             [<B>-G</B> <I>on</I>] [<B>-R</B> <I>mode</I>] [<B>-s</B> <I>hash-size</I>] [<B>-e</B> <I>seconds</I>] [<B>-E</B> <I>spamsecs</I>]
             [<B>-L</B> <I>ltype,facility.level</I>]


</PRE>
<H2><A NAME="DESCRIPTION">DESCRIPTION</A></H2><PRE>
     <B>Dbclean</B> creates empty, rebuilds corrupted, and deletes or expires old
     reports of checksums from DCC databases.  It should be installed where it
     will be found with the path given the DCC server daemon when the daemon
     needs to expand the hash table.  See <B><A HREF="dccd.html">dccd(8)</A></B>.  It should also be run by
     <B>cron(8)</B> approximately daily.

     If the hash table in the database has been damaged, <B>dbclean</B> tries to
     repair the database.

     The contents of the <I>whitelist</I> file are built into the DCC server's data-
     base.  Changes to the whitelist are not effective until dbclean is run to
     expire reports.  White or blacklists can also be used by DCC clients, and
     generally work better there.

   <A NAME="OPTIONS"><B>OPTIONS</B></A>
     The following options are available:

     <A NAME="OPTION-d"><B>-d</B></A>   enables debugging output.  Additional <B>-d</B> options increase the number
          of messages.

     <A NAME="OPTION-F"><B>-F</B></A>   uses write() instead of mmap() in some cases to modify the DCC data-
          base.  This works better on some versions of Solaris provided the
          entire DCC database fits in RAM and provided the file system has not
          been tuned for the large, random accesses of a DCC database.  It is
          the default on Solaris.

     <A NAME="OPTION-f"><B>-f</B></A>   turns off <B>-F</B>.

     <A NAME="OPTION-N"><B>-N</B></A>   creates a new, empty database.  There must not be an existing data-
          base and the DCC server, <B><A HREF="dccd.html">dccd(8)</A></B>, must not be running.

     <A NAME="OPTION-P"><B>-P</B></A>   expires old checksums from a database using the <B>-e -and -E</B> values
          from the preceding use of <B>dbclean</B>.  <B>-P</B> cannot be used with <B>-e</B> or <B>-E</B>.
          Note also that using <B>-P</B> differs from not using <B>-e</B> or <B>-E</B>, because in
          the absence of all four, their default values are used.

     <A NAME="OPTION-S"><B>-S</B></A>   says that the DCC server, <B><A HREF="dccd.html">dccd(8)</A></B>, is not running and so <B>dbclean</B>
          should run stand-alone and not try to tell the DCC server about
          changes to the database.  <B>-i</B> is not needed when <B>-S</B> is present.

     <A NAME="OPTION-V"><B>-V</B></A>   displays the version of the DCC database cleaner.

     <A NAME="OPTION-q"><B>-q</B></A>   quiets the announcement of results at the end.

     <A NAME="OPTION-i"><B>-i</B></A> <I>id</I>
          specifies the DCC ID recognized by the local DCC server as its own.
          This ID allows the DCC server to recognize commands from <B>dbclean</B> to
          stop using the database while it is being cleaned.

     <A NAME="OPTION-a"><B>-a</B></A> [<I>server-addr</I>][<I>,port</I>]
          is commonly used to specify a UDP port or IP address of the local
          server other than the default.

     <A NAME="OPTION-h"><B>-h</B></A> <I>homedir</I>
          overrides the default DCC home directory, <I>@prefix@</I>.

     <A NAME="OPTION-G"><B>-G</B></A> <I>on</I>
          cleans a greylist database.

     <A NAME="OPTION-R"><B>-R</B></A> <I>mode</I>
          repairs a database or does a quick cleaning.  <I>Mode</I> must be one of
          the following:
          <I>bad</I>    to repair a broken database.
          <I>quick</I>  for a quick, superficial cleaning during the day.
          <I>hash</I>   to rebuild a hash not sent to disk before the system was
                 recently restarted.
          <I>cron</I>   for the nightly cleaning by the <B>cron(8)</B> job
                 <I>@libexecdir@/cron-dccd</I>
          <I>del</I>    to finish processing a delete command received by <B><A HREF="dccd.html">dccd(8)</A></B>.

     <A NAME="OPTION-s"><B>-s</B></A> <I>hash-size</I>
          specifies a size for the hash table.  By default the hash table is
          rebuilt to be approximately 80% full based on an estimate of the
          number of distinct checksums in the main file.

     <A NAME="OPTION-e"><B>-e</B></A> <I>seconds</I>
          specifies that reports older than <I>seconds</I> and with totals below 10
          targets should be deleted.  Reports older than <I>seconds</I> of checksums
          that have been reported more recently are summarized in the data-
          base.  The default value is 1DAY or the value of <B>-E</B>, whichever is
          smaller.  The 1 day default is reduced if the system does not appear
          to have enough RAM to hold the database.  The minimum is 1 hour.
          <I>Seconds</I> can also be <I>NEVER</I> or a number of hours, days, or weeks fol-
          lowed by <I>HOURS</I>, <I>H</I>, <I>DAYS</I>, <I>D</I>, <I>WEEKS</I> or <I>W</I>.

          DCC servers that are not very busy and are isolated or do not
          receive "floods" of checksums from busy servers should use longer
          values to increase their chances of recognizing bulk mail.

     <A NAME="OPTION-E"><B>-E</B></A> <I>spamsecs</I>
          changes the expiration of checksums with more than 10 targets from
          the default of 30DAYS or the explicit value of <B>-e</B>, whichever is
          larger.  The default is reduced if the system does not have enough
          RAM to hold the database.  <I>Spamsecs</I> can also be <I>NEVER</I> or a number of
          hours, days, or weeks followed by <I>HOURS</I>, <I>H</I>, <I>DAYS</I>, <I>D</I>, <I>WEEKS</I> or <I>W</I>.

     <A NAME="OPTION-L"><B>-L</B></A> <I>ltype,facility.level</I>
          specifies how messages should be logged.  <I>Ltype</I> must be <I>error</I>, <I>info</I>,
          or <I>off</I> to indicate which of the two types of messages are being con-
          trolled or to turn off all <B>syslog(3)</B> messages from <B>dbclean</B>.  <I>Level</I>
          must be a <B>syslog(3)</B> level among <I>EMERG</I>, <I>ALERT</I>, <I>CRIT</I>, <I>ERR</I>, <I>WARNING</I>,
          <I>NOTICE</I>, <I>INFO</I>, and <I>DEBUG</I>.  <I>Facility</I> must be among <I>AUTH</I>, <I>AUTHPRIV</I>,
          <I>CRON</I>, <I>DAEMON</I>, <I>FTP</I>, <I>KERN</I>, <I>LPR</I>, <I>MAIL</I>, <I>NEWS</I>, <I>USER</I>, <I>UUCP</I>, and <I>LOCAL0</I>
          through <I>LOCAL7</I>.  The default is equivalent to
                <B>-L</B> <I>info,MAIL.NOTICE</I> <B>-L</B> <I>error,MAIL.ERR</I>

     <B>dbclean</B> exits 0 on success, and &gt; 0 if an error occurs.


</PRE>
<H2><A NAME="FILES">FILES</A></H2><PRE>
     <A NAME="FILE-@prefix@">@prefix@</A>      is the DCC home directory containing data and control
                   files.
     <A NAME="FILE-dcc_db">dcc_db</A>        is the main file containing mail checksums.
     <A NAME="FILE-dcc_db.hash">dcc_db.hash</A>   mail checksum database hash table.
     <A NAME="FILE-grey_db">grey_db</A>       is the database of greylist checksums.
     <A NAME="FILE-grey_db.hash">grey_db.hash</A>  is the greylist database hash table.
     <A NAME="FILE-dcc_db">dcc_db</A>-new, dcc_db-new.hash, grey_db-new, grey_db-new.hash
                   new database and hash files until they are renamed.
     <A NAME="FILE-dcc_db">dcc_db</A>-old, grey_db-old
                   previous database files.
     <A NAME="FILE-ids">ids</A>           list of IDs and passwords, as described in <B><A HREF="dccd.html">dccd(8)</A></B>.
     <A NAME="FILE-whitelist">whitelist</A>     contains the DCC server whitelist in the format described
                   in <B><A HREF="dcc.html">dcc(8)</A></B>.
     <A NAME="FILE-grey_whitelist">grey_whitelist</A>
                   contains the greylist server whitelist.


</PRE>
<H2><A NAME="SEE-ALSO">SEE ALSO</A></H2><PRE>
     <B><A HREF="cdcc.html">cdcc(8)</A></B>, <B>cron(8)</B>, <B><A HREF="dcc.html">dcc(8)</A></B>, <B><A HREF="dccd.html">dccd(8)</A></B>, <B><A HREF="dblist.html">dblist(8)</A></B>, <B><A HREF="dccifd.html">dccifd(8)</A></B>, <B><A HREF="dccm.html">dccm(8)</A></B>,
     <B><A HREF="dccproc.html">dccproc(8)</A></B>.


</PRE>
<H2><A NAME="HISTORY">HISTORY</A></H2><PRE>
     Implementation of <B>dbclean</B> was started at Rhyolite Software, in 2000.
     This document describes version 1.3.103.

                               February 26, 2009
</PRE>
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author	Peter Gervai <grin@grin.hu>
date	Tue, 10 Mar 2009 15:03:24 +0100
parents	c7f6b056b673
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