maintenance/benchmarks/bench_delete_truncate.php

   1 <?php
   2 /**
   3  * Benchmark SQL DELETE vs SQL TRUNCATE.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Benchmark
  22  */
  23
  24 require_once __DIR__ . '/Benchmarker.php';
  25
  26 use Wikimedia\Rdbms\IDatabase;
  27 use Wikimedia\Rdbms\IMaintainableDatabase;
  28
  29 /**
  30  * Maintenance script that benchmarks SQL DELETE vs SQL TRUNCATE.
  31  *
  32  * @ingroup Benchmark
  33  */
  34 class BenchmarkDeleteTruncate extends Benchmarker {
  35         public function __construct() {
  36                 parent::__construct();
  37                 $this->addDescription( 'Benchmarks SQL DELETE vs SQL TRUNCATE.' );
  38         }
  39
  40         public function execute() {
  41                 $dbw = $this->getDB( DB_MASTER );
  42
  43                 $test = $dbw->tableName( 'test' );
  44                 $dbw->query( "CREATE TABLE IF NOT EXISTS /*_*/$test (
  45   test_id int unsigned NOT NULL PRIMARY KEY AUTO_INCREMENT,
  46   text varbinary(255) NOT NULL
  47 );" );
  48
  49                 $this->insertData( $dbw );
  50
  51                 $start = microtime( true );
  52
  53                 $this->delete( $dbw );
  54
  55                 $end = microtime( true );
  56
  57                 echo "Delete: " . sprintf( "%6.3fms", ( $end - $start ) * 1000 );
  58                 echo "\r\n";
  59
  60                 $this->insertData( $dbw );
  61
  62                 $start = microtime( true );
  63
  64                 $this->truncate( $dbw );
  65
  66                 $end = microtime( true );
  67
  68                 echo "Truncate: " . sprintf( "%6.3fms", ( $end - $start ) * 1000 );
  69                 echo "\r\n";
  70
  71                 $dbw->dropTable( 'test' );
  72         }
  73
  74         /**
  75          * @param IDatabase $dbw
  76          * @return void
  77          */
  78         private function insertData( $dbw ) {
  79                 $range = range( 0, 1024 );
  80                 $data = [];
  81                 foreach ( $range as $r ) {
  82                         $data[] = [ 'text' => $r ];
  83                 }
  84                 $dbw->insert( 'test', $data, __METHOD__ );
  85         }
  86
  87         /**
  88          * @param IDatabase $dbw
  89          * @return void
  90          */
  91         private function delete( $dbw ) {
  92                 $dbw->delete( 'text', '*', __METHOD__ );
  93         }
  94
  95         /**
  96          * @param IMaintainableDatabase $dbw
  97          * @return void
  98          */
  99         private function truncate( $dbw ) {
 100                 $test = $dbw->tableName( 'test' );
 101                 $dbw->query( "TRUNCATE TABLE $test" );
 102         }
 103 }
 104
 105 $maintClass = "BenchmarkDeleteTruncate";
 106 require_once RUN_MAINTENANCE_IF_MAIN;