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 /**
  27  * Maintenance script that benchmarks SQL DELETE vs SQL TRUNCATE.
  28  *
  29  * @ingroup Benchmark
  30  */
  31 class BenchmarkDeleteTruncate extends Benchmarker {
  32         public function __construct() {
  33                 parent::__construct();
  34                 $this->mDescription = "Benchmarks SQL DELETE vs SQL TRUNCATE.";
  35         }
  36
  37         public function execute() {
  38                 $dbw = wfGetDB( DB_MASTER );
  39
  40                 $test = $dbw->tableName( 'test' );
  41                 $dbw->query( "CREATE TABLE IF NOT EXISTS /*_*/$test (
  42   test_id int unsigned NOT NULL PRIMARY KEY AUTO_INCREMENT,
  43   text varbinary(255) NOT NULL
  44 );" );
  45
  46                 $this->insertData( $dbw );
  47
  48                 $start = microtime( true );
  49
  50                 $this->delete( $dbw );
  51
  52                 $end = microtime( true );
  53
  54                 echo "Delete: " . sprintf( "%6.3fms", ( $end - $start ) * 1000 );
  55                 echo "\r\n";
  56
  57                 $this->insertData( $dbw );
  58
  59                 $start = microtime( true );
  60
  61                 $this->truncate( $dbw );
  62
  63                 $end = microtime( true );
  64
  65                 echo "Truncate: " . sprintf( "%6.3fms", ( $end - $start ) * 1000 );
  66                 echo "\r\n";
  67
  68                 $dbw->dropTable( 'test' );
  69         }
  70
  71         /**
  72          * @param DatabaseBase $dbw
  73          * @return void
  74          */
  75         private function insertData( $dbw ) {
  76                 $range = range( 0, 1024 );
  77                 $data = array();
  78                 foreach ( $range as $r ) {
  79                         $data[] = array( 'text' => $r );
  80                 }
  81                 $dbw->insert( 'test', $data, __METHOD__ );
  82         }
  83
  84         /**
  85          * @param DatabaseBase $dbw
  86          * @return void
  87          */
  88         private function delete( $dbw ) {
  89                 $dbw->delete( 'text', '*', __METHOD__ );
  90         }
  91
  92         /**
  93          * @param DatabaseBase $dbw
  94          * @return void
  95          */
  96         private function truncate( $dbw ) {
  97                 $test = $dbw->tableName( 'test' );
  98                 $dbw->query( "TRUNCATE TABLE $test" );
  99         }
 100 }
 101
 102 $maintClass = "BenchmarkDeleteTruncate";
 103 require_once RUN_MAINTENANCE_IF_MAIN;