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+<?php
+/**
+ * Benchmark SQL DELETE vs SQL TRUNCATE.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup Benchmark
+ */
+
+require_once __DIR__ . '/Benchmarker.php';
+
+use Wikimedia\Rdbms\IDatabase;
+use Wikimedia\Rdbms\IMaintainableDatabase;
+
+/**
+ * Maintenance script that benchmarks SQL DELETE vs SQL TRUNCATE.
+ *
+ * @ingroup Benchmark
+ */
+class BenchmarkDeleteTruncate extends Benchmarker {
+ protected $defaultCount = 10;
+
+ public function __construct() {
+ parent::__construct();
+ $this->addDescription( 'Benchmarks SQL DELETE vs SQL TRUNCATE.' );
+ }
+
+ public function execute() {
+ $dbw = $this->getDB( DB_MASTER );
+
+ $test = $dbw->tableName( 'test' );
+ $dbw->query( "CREATE TABLE IF NOT EXISTS /*_*/$test (
+ test_id int unsigned NOT NULL PRIMARY KEY AUTO_INCREMENT,
+ text varbinary(255) NOT NULL
+);" );
+
+ $this->bench( [
+ 'Delete' => [
+ 'setup' => function () use ( $dbw ) {
+ $this->insertData( $dbw );
+ },
+ 'function' => function () use ( $dbw ) {
+ $this->delete( $dbw );
+ }
+ ],
+ 'Truncate' => [
+ 'setup' => function () use ( $dbw ) {
+ $this->insertData( $dbw );
+ },
+ 'function' => function () use ( $dbw ) {
+ $this->truncate( $dbw );
+ }
+ ]
+ ] );
+
+ $dbw->dropTable( 'test' );
+ }
+
+ /**
+ * @param IDatabase $dbw
+ * @return void
+ */
+ private function insertData( $dbw ) {
+ $range = range( 0, 1024 );
+ $data = [];
+ foreach ( $range as $r ) {
+ $data[] = [ 'text' => $r ];
+ }
+ $dbw->insert( 'test', $data, __METHOD__ );
+ }
+
+ /**
+ * @param IDatabase $dbw
+ * @return void
+ */
+ private function delete( $dbw ) {
+ $dbw->delete( 'text', '*', __METHOD__ );
+ }
+
+ /**
+ * @param IMaintainableDatabase $dbw
+ * @return void
+ */
+ private function truncate( $dbw ) {
+ $test = $dbw->tableName( 'test' );
+ $dbw->query( "TRUNCATE TABLE $test" );
+ }
+}
+
+$maintClass = BenchmarkDeleteTruncate::class;
+require_once RUN_MAINTENANCE_IF_MAIN;