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