deleteOldRevisions.php

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<?php

require_once( dirname( __FILE__ ) . '/Maintenance.php' );

class DeleteOldRevisions extends Maintenance {
        public function __construct() {
                parent::__construct();
                $this->mDescription = "Delete old (non-current) revisions from the database";
                $this->addOption( 'delete', 'Actually perform the deletion' );
                $this->addOption( 'page_id', 'List of page ids to work on', false );
        }

        public function execute() {
                $this->output( "Delete old revisions\n\n" );
                $this->doDelete( $this->hasOption( 'delete' ), $this->mArgs );
        }

        function doDelete( $delete = false, $args = array() ) {

                # Data should come off the master, wrapped in a transaction
                $dbw = wfGetDB( DB_MASTER );
                $dbw->begin();

                $tbl_pag = $dbw->tableName( 'page' );
                $tbl_rev = $dbw->tableName( 'revision' );

                $pageIdClause = '';
                $revPageClause = '';

                # If a list of page_ids was provided, limit results to that set of page_ids
                if ( sizeof( $args ) > 0 ) {
                        $pageIdList = implode( ',', $args );
                        $pageIdClause = " WHERE page_id IN ({$pageIdList})";
                        $revPageClause = " AND rev_page IN ({$pageIdList})";
                        $this->output( "Limiting to {$tbl_pag}.page_id IN ({$pageIdList})\n" );
                }

                # Get "active" revisions from the page table
                $this->output( "Searching for active revisions..." );
                $res = $dbw->query( "SELECT page_latest FROM $tbl_pag{$pageIdClause}" );
                $cur = array();
                foreach ( $res as $row ) {
                        $cur[] = $row->page_latest;
                }
                $this->output( "done.\n" );

                # Get all revisions that aren't in this set
                $old = array();
                $this->output( "Searching for inactive revisions..." );
                $set = implode( ', ', $cur );
                $res = $dbw->query( "SELECT rev_id FROM $tbl_rev WHERE rev_id NOT IN ( $set ){$revPageClause}" );
                foreach ( $res as $row ) {
                        $old[] = $row->rev_id;
                }
                $this->output( "done.\n" );

                # Inform the user of what we're going to do
                $count = count( $old );
                $this->output( "$count old revisions found.\n" );

                # Delete as appropriate
                if ( $delete && $count ) {
                        $this->output( "Deleting..." );
                        $set = implode( ', ', $old );
                        $dbw->query( "DELETE FROM $tbl_rev WHERE rev_id IN ( $set )" );
                        $this->output( "done.\n" );
                }

                # This bit's done
                # Purge redundant text records
                $dbw->commit();
                if ( $delete ) {
                        $this->purgeRedundantText( true );
                }
        }
}

$maintClass = "DeleteOldRevisions";
require_once( RUN_MAINTENANCE_IF_MAIN );