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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;
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