對於比較OCCI(Oracle C++調用接口)和舊的JDBC的性能測試,我感到非常驚訝。JDBC比OCCI顯着更快。我應該感到驚訝嗎?
下面是代碼:
#include <iostream>
#include <cstdlib>
#include <occi.h>
using namespace oracle::occi;
using namespace std;
const string username = "system";
const string password = "******";
const string url = "(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=XE)))";
const string sql = "select * from CREDITO.movtos_cuentas";
int main(int argc, char** argv) {
cout << "Oracle Connectivity" << endl;
Environment *env = Environment::createEnvironment(Environment::DEFAULT);
Connection *conn = env->createConnection(username, password, url);
Statement *stm = conn->createStatement(sql);
ResultSet *rs = stm->executeQuery();
unsigned long count = 0;
while (rs->next()) {
count++;
}
stm->closeResultSet(rs);
conn->terminateStatement(stm);
env->terminateConnection(conn);
Environment::terminateEnvironment(env);
cout << "Registros na CREDITO.MOVTOS_CUENTAS: " << count << endl;
return 0;
}
這裏是Java代碼:
package oraconnect.jdbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class OraconnectJdbc {
public static void main(String[] args) {
Connection conn = null;
Statement stm = null;
ResultSet rs = null;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
conn = DriverManager.getConnection(
"jdbc:oracle:thin:@127.0.0.1:1521:xe", "system", "******");
stm = conn.createStatement();
rs = stm.executeQuery("select * from CREDITO.movtos_cuentas");
long count = 0;
while (rs.next()) {
count++;
}
System.out.printf("Registros na CREDITO.MOVTOS_CUENTAS: %d\n", count);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
//Ignore
}
}
if (stm != null) {
try {
stm.close();
} catch (SQLException e) {
//Ignore
}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
//Ignore
}
}
}
}
}
執行:
C++版本
time LD_LIBRARY_PATH=/home/eduardo/Private/Oracle/instantclient_11_2/. ./oraconnect
Java版本
time java -jar oraconnect-jdbc.jar -cp lib/oracle-driver-11.2.0.3.jar
C++結果:
real 1m29.392s
user 0m32.788s
sys 0m20.812s
Java結果:
real 0m28.404s
user 0m12.076s
sys 0m4.236s
結論:
Java是顯著快於C++
我不知道我已經做出了錯誤或使用一些不好的實踐e與C++版本。任何人都可以幫助我理解這個結果嗎?
他發佈了一個問題,你不能相信接下來會發生什麼! –
NathanOliver,結果已發佈。 – filosofisto
結論 - 你跑第二的速度更快,因爲一堆數據已經從磁盤中提取出來,並且坐在SGA中。 –