事務提交大量sql與合併提交大量sql效率對比
阿新 • • 發佈：2019-02-18
事務提交5000條update，耗時：13.79 秒，記憶體佔用：17.88 MB（大量時間消耗在Query生成sql語句上）
事務提交5000條update，耗時：9.59 秒，記憶體佔用：16.66 MB（一次性生成sql語句）
$startTime = microtime(true); $startMemory = memory_get_usage(); $transaction = \Yii::$app->db->beginTransaction(); for($i=0; $i< 5000; ++$i) { \Yii::$app->db->createCommand()->update(UserMenu::tableName(), ['menu_id' => 4], ['user_id' => $id, 'menu_id' => 3])->execute(); } $transaction->commit(); $endTime = microtime(true); $runtime = number_format($endTime - $startTime, 2); //秒 $endMemory = memory_get_usage(); $usedMemory = number_format(($endMemory - $startMemory) / 1024 / 1024, 2); //MB echo("耗時：$runtime 秒，記憶體佔用：$usedMemory MB");
事務提交5000條update，耗時：9.59 秒，記憶體佔用：16.66 MB（一次性生成sql語句）
$transaction = \Yii::$app->db->beginTransaction(); $sql = \Yii::$app->db->createCommand()->update(UserMenu::tableName(), ['menu_id' => 4], ['user_id' => $id, 'menu_id' => 3])->getRawSql().';'; $startTime = microtime(true); $startMemory = memory_get_usage(); for($i=0; $i< 5000; ++$i) { \Yii::$app->db->createCommand($sql)->execute(); } $transaction->commit(); $endTime = microtime(true); $runtime = number_format($endTime - $startTime, 2); //秒 $endMemory = memory_get_usage(); $usedMemory = number_format(($endMemory - $startMemory) / 1024 / 1024, 2); //MB
echo("耗時：$runtime 秒，記憶體佔用：$usedMemory MB");$startTime = microtime(true); $startMemory = memory_get_usage(); $transaction = \Yii::$app->db->beginTransaction(); $sql = ''; for($i=0; $i< 5000; ++$i) { $sql .= \Yii::$app->db->createCommand()->update(UserMenu::tableName(), ['menu_id' => 4], ['user_id' => $id, 'menu_id' => 3])->getRawSql().';'; } \Yii::$app->db->createCommand($sql)->execute(); $transaction->commit(); $endTime = microtime(true); $runtime = number_format($endTime - $startTime, 2); //秒 $endMemory = memory_get_usage(); $usedMemory = number_format(($endMemory - $startMemory) / 1024 / 1024, 2); //MB
echo("耗時：$runtime 秒，記憶體佔用：$usedMemory MB");$transaction = \Yii::$app->db->beginTransaction();
$sql = '';
for($i=0; $i< 5000; ++$i) {
$sql .= \Yii::$app->db->createCommand()->update(UserMenu::tableName(), ['menu_id' => 4], ['user_id' => $id, 'menu_id' => 3])->getRawSql().';';
}
$startTime = microtime(true);
$startMemory = memory_get_usage();
\Yii::$app->db->createCommand($sql)->execute();
$transaction->commit();
$endTime = microtime(true);
$runtime = number_format($endTime - $startTime, 2); //秒
$endMemory = memory_get_usage();
$usedMemory = number_format(($endMemory - $startMemory) / 1024 / 1024, 2); //MB
echo("耗時：$runtime 秒，記憶體佔用：$usedMemory MB");