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DEXPIREOVER(8)		    System Manager's Manual		DEXPIREOVER(8)

NAME
       dexpireover - Diablo program to expire overview files for diablo	reader
       side

SYNOPSIS
       dexpireover [ -a	] [ -e ] [ -f dactive-kp-database ] [ -l lockwait ]  [
       -NB  ] [	-n ] [ -O[n] ] [ -o ] [	-pN ] [	-R ] [ -s ] [ -U ] [ -v[N] ] [
       -w wildcard ] [ -x ] [ -y ] [ -C	diablo.config ]	[ -d[n]	] [ -V ]

DESCRIPTION
       DExpireOver does	an expire run on the overview information  the	Diablo
       reader  stores  in  /news/spool/group.  It scans	the directory tree for
       data. and over.	files and matches them up against information  in  the
       active  file  database (defaults	to dactive.kp).	 If you	do not give it
       the group wildcard option, it can detect	and  remove  over.  and	 data.
       files associated	with non-existant (i.e.	deleted) groups.

       dexpireover  will  expire articles in the overview based	on the 'x' op-
       tion in the dexpire.ctl file.  If the -a	or -NB options are  given,  it
       will  update the	active file.  dexpireover is usually run with just the
       -a option.

       If the -e option	is given, dexpireover will expire  articles  based  on
       what  articles  are  left  in  your  local spool. This requires a local
       spool.

       -a

       This option turns on -NB, -U, -s, and -y. These are the options used in
       a standard dexpireover run.

       -e

       Tell  dexpireover  that spool-based expiration should be	used. This op-
       tion will cause dexpireover to look up  every  message  stored  in  the
       overview	 database  in  the history file, and expire the	article	if the
       history entry is	marked expired.	This requires that your	reader machine
       carries	a  local  spool, and only articles in your local spool will be
       left in overview. You should not	specify	this option and	-o at the same
       time.

       -f dactive-KP-database-file

       Specify	a  different  active  file  (KP	 database).   The  default  is
       /news/dactive.kp.

       -l lockwait

       Specify the amount of time (in seconds) to wait for a lock when	resiz-
       ing  or	rewriting  files.  The default is to not resize/rewrite	if the
       file is locked. A value of greater than 30 seconds  will	 have  a  much
       better  chance  of  being  able to resize/rewrite groups	because	reader
       processes flush their lock cache	every 30 seconds (approx).

       -NB

       Allow dexpireover to update the beginning article number	in the	active
       file.  This option is implied by	-a.

       -n

       This  option  guarentees	that the overview and active files will	NOT be
       updated,	i.e. so	you can	do a dry run to	 see  what  dexpireover	 would
       have done.  The -n option also sets the verbose level to	1 if it	hasn't
       been set	with the -v option.

       -O[n]

       Request that dexpireover	delete groups which have not had new  articles
       in  'n'	days.	If 'n' is not specified, 90 days is used.  dexpireover
       will also add any missing LMTS fields to	groups.	 This option  requires
       that  you  also	specify	 a wildcard via	the -w option.	This option is
       generally used to keep the alt groups clean.

       When dexpireover	deletes	a newsgroup, it	does not delete	 the  overview
       data for	that group until the next time dexpireover is run.

       WARNING:	Please note that this option uses the LMTS option to determine
       the age of a newsgroup. This option is updated each time	an article  is
       received	for a group and	only updated by	dreaderd at this time. Running
       it on a feed-only server	or a reader that does control-only groups  may
       cause active groups to expire. Use with caution.

       -o

       Tell  dexpireover  that	it  should use the file	specified by path_dex-
       pover_list in diablo.config (path_db based) to  decide  which  articles
       should be removed from overview.	This is	similar	to the spool-based ex-
       piration	method,	but does not perform history lookups on	every article,
       and  can	be faster. This	also requires that you run dexpire with	the -o
       option.

       The 'x' option in dexpire.ctl will also be used	to  safeguard  against
       stale  articles which somehow avoided being written to dexpover.dat and
       remain in overview. You should probably set your	'x' value high in  or-
       der to avoid removing valid articles.

       The  dexpover.dat  file will be removed after being read	in by dexpire-
       over.

       You should not specify this option and -e at the	same time.

       -pN

       Spawn N working dexpireover processes, and  one	master	process	 which
       waits  for the parcount children	to exit. Useful	for speeding up	the -e
       option, when  your  dhistory  disk(s)  can  support  multiple  dhistory
       lookups	at one time without slowing down linearly. Twice the number of
       disks on	your striped /news partition is	probably not  an  unreasonable
       number to use.

       Using  a	 value of N greater than 16 is not currently supported.	Values
       other than powers of 2 are likely to generate uneven load across	forks.

       -R

       Instruct	 dexpireover  to  rewrite  the	data.*	and  over.*  files  in
       /news/spool/group.   dexpireover	will attempt to	dynamically size index
       files based on the number of apparently valid articles in  each	group,
       and will	rewrite	data files to piecemeal	remove unreferenced articles.

       This  works somewhat differently	then expireover	with standard options,
       takes a lot more	time, and should typically be run only	once  a	 week.
       The standard dexpireover, 'dexpireover -a', does	not resize index files
       or rewrite data files, it  simply  performs  the	 expiration  pass  and
       deletes	whole  data files if none of the articles residing in them are
       referenced any longer.  This suffices for a daily expiration, but 'dex-
       pireover	 -R  -a'  should be used once a	week to	clean up the tailings.
       See samples/adm/weekly.reader

       -s

       This  options  is  like	-R  but	 only  resizes	the  over.*  files  in
       /news/spool/group.   It	does  not  attempt  to	trim  data.*  files in
       /news/spool/group.  This	option has no effect on	over.* files that  are
       already	properly  sized,  unlike  -R  which  rewrites the over.* files
       whether they are	properly sized or not.

       Overview	index files may	only be	resized	if  no	dreaderd's  have  them
       open.  If any do, the resize will fail (dexpireover will	not be able to
       obtain the lock).  Since	dexpireover is typically run once an hour, the
       resize  will  be	retried	on each	run until it succeeds.	If you need to
       resize a	group in realtime and you cant due to existing locks, you must
       unfortunately kill dreaderd, do the operation, then restart dreaderd.

       -U

       Allow  dexpireover to add missing CTS fields (group-creation-time-stamp
       field).	Earlier	test releases didn't add this field.  dexpireover  can
       fixup these records.

       -v

       This option turns on verbose output.

       -w wildcard

       Restrict	 operations  to	 the specified groups.	Note: if you specify a
       wildcard, dexpireover will not be able to prune deleted groups from the
       overview	directory structure.

       -x

       The  normal operation for adjusting the maxarts value for a group is to
       reduce maxarts by 1/3 if	numarts	< than 1/2 of maxarts or  to  increase
       maxarts	by  1/3	 if  numarts > 2/3 of maxarts. Under normal operation,
       this works well.	The ``-x'' option changes this policy  to  adjust  the
       maxarts	depending  on  a  factor of the	max article age	and the	expire
       time of the group. This option has  not	been  extensively  tested  and
       should be avoided in normal operation.

       -y

       Perform	the  actual  expire  of	 headers  as specified in dexpire.ctl.
       Without this option, no headers are expired although groups  can	 still
       be resized or overview files rebuilt.

       -C  allows  the	specification of the path of the diablo.config file to
       use.

       -d[n] will set debug mode, at optional level n.

       -V will print the version and exit.

INTERRUPTING
       Generally speaking, you should not  interrupt  a	 running  dexpireover.
       Doing so	will cause, at worst, one newsgroup to lose its	overview.

SEE ALSO
       diablo(8), dicmd(8), didump(8), diload(8), dnewslink(8),	doutq(8), dex-
       pire(8),	diconvhist(8), dilookup(8),  dspoolout(8),  dkp(8),  dpath(8),
       diablo-kp(5), diablo-files(5)

								DEXPIREOVER(8)

NAME | SYNOPSIS | DESCRIPTION | INTERRUPTING | SEE ALSO

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