NAME¶
makehistory - Initialize or rebuild INN history database
SYNOPSIS¶
makehistory [
-abFIOSx] [
-f filename] [
-l
count] [
-L load-average] [
-s size]
[
-T tmpdir]
DESCRIPTION¶
makehistory rebuilds the
history(5) text file, which contains a
list of message-IDs of articles already seen by the server. It can also be
used to rebuild the overview database. Note that even though the
dbz(3)
indices for the
history file are also rebuilt by
makehistory, it
is useful to run
makedbz(8) after
makehistory(8) in order to
improve the efficiency of the indices (
makehistory does not know how
large to make the hash table at first run, unless the size is given by the
-s flag).
The default location of the
history text file is
pathdb/history;
to specify an alternate location, use the
-f flag.
By default,
makehistory will scan the entire spool, using the storage
manager, and write a history line for every article. To also generate overview
information, use the
-O flag.
WARNING: If you're trying to rebuild the overview database, be sure to stop
innd(8) and delete or zero out the existing database before you start
for the best results. An overview rebuild should not be done while the server
is running. Unless the existing overview is deleted, you may end up with
problems like out-of-order overview entries, excessively large overview
buffers, and the like.
If
ovmethod in
inn.conf is "ovdb", you must have the
ovdb processes running while rebuilding overview. ovdb needs them available
while writing overview entries. You can start them by hand separate from the
rest of the server by running
ovdb_init; see
ovdb_init(8) for
more details.
OPTIONS¶
- -a
- Append to the history file rather than generating a
new one. If you append to the main history file, make sure
innd(8) is throttled or not running, or you can corrupt the
history.
- -b
- Delete any messages found in the spool that do not have
valid Message-ID: headers in them.
- -F
- Fork a separate process to flush overview data to disk
rather than doing it directly. The advantage of this is that it allows
makehistory to continue to collect more data from the spool while
the first batch of data is being written to the overview database. The
disadvantage is that up to twice as much temporary disk space will be used
for the generated overview data. This option only makes sense in
combination with -O. With buffindexed, the overchan program
is invoked to write overview.
- -f filename
- Rather than writing directly to pathdb/history,
instead write to filename, also in pathdb.
- -I
- Don't store overview data for articles numbered lower than
the lowest article number in active. This is useful if there are
for whatever reason old articles on disk that shouldn't be available to
readers or put into the overview database.
- -l count
- This option specifies how many articles to process before
writing the accumulated overview information out to the overview database.
The default is 10000. Since overview write performance is faster with
sorted data, each "batch" gets sorted. Increasing the batch size
with this option may further improve write performance, at the cost of
longer sort times. Also, temporary space will be needed to store the
overview batches. At a rough estimate, about 300 * count bytes of
temporary space will be required (not counting temp files created by
sort(1)). See the description of the -T option for how to
specify the temporary storage location. This option has no effect with
buffindexed, because buffindexed does not need sorted overview and no
batching is done.
- -L load-average
- Temporarily pause activities if the system load average
exceeds the specified level load-average. This allows
makehistory to run on a system being used for other purposes
without monopolizing system resources and thus making the response time
for other applications unacceptably slow. Using nice(1) does not
help much for that because the problem comes from disk I/O usage, and
ionice(1) is not always available or efficient.
- -O
- Create the overview database as well as the history
file. Overview information is only required if the server supports
readers; it is not needed for a transit-only server (see
enableoverview in inn.conf(5)). If you are using the
buffindexed overview storage method, erase all of your overview buffers
before running makehistory with -O.
- -S
- Rather than storing the overview data into the overview
database, just write it to standard output in a form suitable for feeding
to overchan later if wished. When this option is used, -F,
-I, -l, and -T are ignored. This option only makes
sense in combination with -O.
- -s size
- Size the history database for approximately size
pairs. Accurately specifying the size is an optimization that will create
a more efficient database. (The size should be the estimated eventual size
of the history file, typically the size of the old file, in
lines.)
- -T tmpdir
- If -O is given, makehistory needs a location
to write temporary overview data. By default, it uses pathtmp, set
in inn.conf, but if this option is given, the provided
tmpdir is used instead. This is also used for temporary files
created by sort(1) (which is invoked in the process of writing
overview information since sorted overview information writes faster). By
default, sort usually uses your system temporary directory; see the
sort(1) man page on your system to be sure.
- -x
- If this option is given, makehistory won't write out
history file entries. This is useful mostly for building overview
without generating a new history file.
EXAMPLES¶
Here's a typical example of rebuilding the entire history and overview database,
removing broken articles in the news spool. This uses the default temporary
file locations and should be done while
innd isn't running (or is
throttled).
makehistory -b -f history.n -O -l 30000 -I
This will rebuild the overview (if using buffindexed, erase the existing
overview buffers before running this command) and leave a new
history
file as "history.n" in
pathdb. To preserve all of the history
entries from the old
history file that correspond to rejected articles
or expired articles, follow the above command with:
cd <pathdb>
awk 'NF == 2 { print }' < history >> history.n
(replacing the path with your
pathdb, if it isn't the default). Then look
over the new
history file for problems and run:
makedbz -s `wc -l < history.n` -f history.n
Then rename all of the files matching "history.n.*" to
"history.*", replacing the current history database and indices.
After that, it's safe to unthrottle
innd.
For a simpler example:
makehistory -b -f history.n -I -O
will scan the spool, removing broken articles and generating history and
overview entries for articles missing from history.
To just rebuild overview:
makehistory -O -x -F
FILES¶
- pathdb/history
- This is the default output file for
makehistory.
- pathtmp
- Where temporary files are written unless -T is
given.
HISTORY¶
Originally written by Rich $alz <rsalz@uunet.uu.net> for InterNetNews and
updated by various other people since.
$Id: makehistory.pod 8535 2009-06-23 18:09:56Z iulius $
SEE ALSO¶
active(5),
ctlinnd(8),
dbz(3),
history(5),
inn.conf(5),
innd(8),
makedbz(8),
ovdb_init(8),
overchan(8).