p6spy 可以输出日志到文件中、控制台、或者传递给 Log4j，而且还能配搭 SQL Profiler 或 IronTrackSQL 图形化监控 SQL 语句，监测到哪些语句的执行是耗时的，逐个优化。关于与 SQL Profiler 或 IronTrackSQL 的配合使用可参数文件的链接。 

p6spy在sourceforge上下载：http://sourceforge.net/projects/p6spy/?source=dlp

p6spy的配置：
第一：p6spy.jar放入应用的classpath下
第二：修改连接池或者连接配置的jdbc的驱动为p6spy所提供的驱动，com.p6spy.engine.spy.P6SpyDriver

在单独的Hibernate的应用中，数据库驱动配置在hibernate.cfg.xml里面,所以我需要配置文件中的connection.driver_class属性从oracle.jdbc.driver.OracleDriver改为com.p6spy.engine.spy.P6SpyDriver其他的用户名密码等等配置信息全部不用修改.在web程序中，配置的连接池部分，也只需要修改jdbc-driver的配置即可。

<session-factory>      <!-- 在这里改成p6spy提供的数据源 -->      <property name="connection.driver_class">com.p6spy.engine.spy.P6SpyDriver</property>             <property name="connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property>      <property name="connection.username">scott</property>      <property name="connection.password">tiger</property>      <property name="connection.pool_size">1</property>      <property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>      <property name="current_session_context_class">thread</property>      <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>      <property name="show_sql">true</property>      <property name="hbm2ddl.auto">false</property>      <property name="hibernate.jdbc.batch_size">0</property>  </session-factory>

（文件内容太多了，仅附上几处重要的）

#################################################################  # MODULES                                                       #  #                                                               #  # Modules provide the P6Spy functionality.  If a module, such   #  # as module_log is commented out, that functionality will not   #  # be available.  If it is not commented out (if it is active),  #  # the functionality will be active.                             #  #                                                               #  # Values set in Modules cannot be reloaded using the            #  # reloadproperties variable.  Once they are loaded, they remain #  # in memory until the application is restarted.                 #  #                                                               #  #################################################################  #第一：module.log的属性必须配置，如果不配置，P6SPY将不起任何作用，典型配置：  module.log=com.p6spy.engine.logging.P6LogFactory  #module.outage=com.p6spy.engine.outage.P6OutageFactory    #################################################################  # REALDRIVER(s)                                                 #  #                                                               #  # In your application server configuration file you replace the #  # "real driver" name with com.p6spy.engine.P6SpyDriver. This is #  # where you put the name of your real driver P6Spy can find and #  # register your real driver to do the database work.            #  #                                                               #  # If your application uses several drivers specify them in      #  # realdriver2, realdriver3.  See the documentation for more     #  # details.                                                      #  #                                                               #  # Values set in REALDRIVER(s) cannot be reloaded using the      #  # reloadproperties variable.  Once they are loaded, they remain #  # in memory until the application is restarted.                 #  #                                                               #  #################################################################    #第二：数据库驱动配置，你懂的，不多说了  # oracle driver  # realdriver=oracle.jdbc.driver.OracleDriver    # mysql Connector/J driver  # realdriver=com.mysql.jdbc.Driver    # informix driver  # realdriver=com.informix.jdbc.IfxDriver    # ibm db2 driver  # realdriver=COM.ibm.db2.jdbc.net.DB2Driver    # the mysql open source driver  realdriver=org.gjt.mm.mysql.Driver    #specifies another driver to use  realdriver2=  #specifies a third driver to use  realdriver3=    #第三：appender配置，一般分为三种  #specifies the appender to use for logging  #appender=com.p6spy.engine.logging.appender.Log4jLogger  #控制台  #appender=com.p6spy.engine.logging.appender.StdoutLogger  appender=com.p6spy.engine.logging.appender.FileLogger    # name of logfile to use, note Windows users should make sure to use forward slashes in their pathname (e:/test/spy.log) (used for file logger only)  #日志文件存放路径及文件名  logfile     = spy.log    # append to  the p6spy log file.  if this is set to false the  # log file is truncated every time.  (file logger only)  append=true    #The following are for log4j logging only  log4j.appender.STDOUT=org.apache.log4j.ConsoleAppender  log4j.appender.STDOUT.layout=org.apache.log4j.PatternLayout  log4j.appender.STDOUT.layout.ConversionPattern=p6spy - %m%n    log4j.logger.p6spy=INFO,STDOUT