如何根据tomcat中的线程计算连接池以避免ORA-12519

Question

问题：我收到以下错误

ORA-12519，TNS：找不到合适的服务处理程序

说明：

我想在tomcat中配置线程和连接池，以便在最佳级别使用它们。 我可以配置高达500-600线程的吞吐量， 我有更多的servlet将使用具有类似线程的数据库。

我正在调用一个servlet来插入db（下面提到的代码）中的条目，其中包含150个Threads，要完成的任务是100000

    static int joblimit = 100000;
    static int TPS = 150;

     public static void insertMethod()
{

    RateLimiter rateLimiter = RateLimiter.create(TPS);
    ExecutorService executorService = Executors.newCachedThreadPool();
    start = System.currentTimeMillis();

    for (int i = 0; i < joblimit; i++) {
        rateLimiter.acquire(); // may wait
        final int j = i;
        executorService.execute(new Runnable() {
            @Override
            public void run() {
                log.info(str);
                try {
                    callInsertURL(j);
                } catch (Exception e) {
                    log.error(e);
                }
                if (index == joblimit) {
                    long timeTaken = System.currentTimeMillis() - start;
                    String oneThreadProcessedInSecs = ""+(float)(1*(timeTaken/60)/joblimit);
                    log.info(joblimit + " jobs completed in "
                            + timeTaken 
                            + " msec i.e ["+(float)(timeTaken/60)+"sec,"+"] with " + TPS + " tps, oneThreadProcessedInSecs="+oneThreadProcessedInSecs);
                }
            }
        });
    }
    try {
        executorService.shutdown();
        executorService.awaitTermination(100, TimeUnit.SECONDS);
        log.info("--------------All Tasks Processed Processed----------------------------");
    } catch (Exception e) {
            e.printStackTrace();
    }
}

我的Tomcat和Java配置： Context.xml条目

<Resource name="jdbc/myoracle" global="jdbc/myoracle" auth="Container" type="javax.sql.DataSource" driverClassName="oracle.jdbc.OracleDriver" url="jdbc:oracle:thin:@myip:1521:mydb" username="myusername" password="mypassword" maxActive="250" maxIdle="30" maxWait="10000" />

server.xml条目

<Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true" maxThreads="150" scheme="https" secure="true" clientAuth="false" sslProtocol="TLS" />

Spring配置：servlet-context.xml

<beans:bean id="dbDataSource" class="org.springframework.jndi.JndiObjectFactoryBean"> <beans:property name="jndiName" value="java:comp/env/jdbc/myoracle"/> </beans:bean>

ServeltController将调用以下方法插入DB：

@Autowired
@Qualifier("commonDAO")
protected CommonDAO commonDAO;

String qry = "INSERT INTO TB_CUSTOMER(customer_msisdn,op_id,cuser,country_id) VALUES(?,?,?,?)";
String[] colNamesTobeReturned = {"CUSTOMER_ID"};
commonDAO.insertOrUpdateWithReturnPK(qry, colNamesTobeReturned, msisdn,opid,cuser,countryid);

将访问数据库的方法：

    public Long insertOrUpdateWithReturnPK(final String qry,final String[] colNamesTobeReturned,final Object... params)
        {
            KeyHolder keyHolder = new GeneratedKeyHolder();
            try {
                getJdbcTemplate().update(
                        new PreparedStatementCreator() {
                            public PreparedStatement createPreparedStatement(Connection connection) throws SQLException {
                                PreparedStatement ps = connection.prepareStatement(qry, colNamesTobeReturned);
                                utilMapParamsToPStmt(ps,params);
                                return ps;
                            }
                        },
                        keyHolder);
                if(keyHolder != null)
                    return keyHolder.getKey().longValue();
            } catch (Exception e) {
                handleDBExceptions(e);
            }
                return 0L;
        }