mirror of https://github.com/BOINC/boinc.git
58 lines
1.8 KiB
PHP
58 lines
1.8 KiB
PHP
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<?php
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require_once("docutil.php");
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page_head("Database purging utility");
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echo "
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As a BOINC project operates, the size of its
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workunit result tables increases,
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and eventually they become inconveniently large
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(for example, adding a field or building an index may take hours or days).
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<p>
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To address this problem, BOINC provides a utility <b>db_purge</b>
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that 'purges' result and WU records by writing them
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to XML-format archive files, then deleting them from the database.
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<p>
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Workunits are purged only when their input files have been deleted.
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Because of BOINC's file-deletion policy,
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this implies that all results are completed.
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So when a workunit is purged, all its results are purged too.
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<p>
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The archive files have names of the form
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wu_archive_TIME and result_archive_TIME
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where TIME is the Unix time the file was created.
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In addition, db_purge generates index files
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'wu_index' and 'result_index'
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associating each WU and result ID with the timestamp of its archive file.
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<p>
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Run db_purge from the project's bin/ directory.
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It will create an archive/ directory and store archive files there.
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<p>
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db_purge is normally run as a daemon,
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specified in the <a href=configuration.php>config.xml</a> file.
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It has the following command-line options:
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";
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list_start();
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list_item("-min_age_days N",
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"Purge only WUs with mod_time at least N days in the past.
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Recommended value: 7 or so.
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This lets users examine their recent results."
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);
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list_item("-max N", "Purge at most N WUs, then exit");
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list_item("-max_wu_per_file N",
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"Write at most N WUs to each archive file.
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Recommended value: 10,000 or so."
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);
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list_item("-zip", "Compress archive files using zip");
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list_item("-gzip", "Compress archive files using gzip");
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list_item("-d N", "Set logging verbosity to N (1,2,3)");
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list_end();
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echo "
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";
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page_tail();
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?>
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