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讲解DB2 V9.5工作负载管理之定义服务类

 2008-08-20 16:24:02 来源:WEB开发网   
核心提示: 需要对每个数据库定制时间间隔,而不是对每个 SQL 请求、命令调用或应用程序进行定制,讲解DB2 V9.5工作负载管理之定义服务类(9),没有其他配置参数需要考虑,注: 所有 WLM 统计信息表函数都返回自上次复位统计信息以来累积的统计信息,以及默认创建的服务子类SYSDEFAULTSUB

需要对每个数据库定制时间间隔,而不是对每个 SQL 请求、命令调用或应用程序进行定制。没有其他配置参数需要考虑。

注: 所有 WLM 统计信息表函数都返回自上次复位统计信息以来累积的统计信息。将按此配置参数指定的时间间隔定期复位统计信息。

需要注意的是,默认的服务子类 SYSDEFAULTSUBCLASS,自动为每个服务父类自动创建一个。我们可以通过系统视图 SYSCAT.SERVICECLASSES,或者通过 db2pd 加 –serviceclasses 选项进行查看定义的服务类。

继续在 DB2CLP 窗口中,发出 DB2PD 命令,查看我们创建的服务类情况,我们可以看到服务父类SUPER_CLASS,服务子类 SUBCLASS_RHETTE、SUBCLASS_DB2ADMIN,以及默认创建的服务子类SYSDEFAULTSUBCLASS,具体如清单7所示:

清单 7 . 查看窗口的服务类

Database Partition 0 - - Database DB2TEST1 - - Active - - Up 0 days 06 : 26 : 15
Service Classes:
. . . . . . . . . .        
Service Class Name    = SUPER_CLASS
Service Class ID     = 14         
Service Class Type    = Service Superclass
Default Subclass ID    = 15         
Service Class State    = Enabled
Agent Priority      = Default
Prefetch Priority     = Default
Outbound Correlator    = None
Work Action Set ID    = N/A
Collect Activity Opt   = None
Num Connections        = 0         
Last Statistics Reset Time   = 2007 - 12 - 27 13:33:05.000000
Num Coordinator Connections  = 0         
Coordinator Connections HWM  = 0         
Associated Workload Occurrences ( WLO ) :
AppHandl [ nod - index ] WL ID    WLO ID    UOW ID WLO State
Service Class Name    = SYSDEFAULTSUBCLASS
Service Class ID     = 15         
Service Class Type    = Service Subclass
Parent Superclass ID   = 14         
Service Class State    = Enabled
Agent Priority      = Default
Prefetch Priority     = Default
Outbound Correlator    = None
Collect Activity Opt   = None
Collect Aggr Activity Opt = None
Collect Aggr Request Opt = None
Act Lifetime Histogram Template ID     = 1     
Act Queue Time Histogram Template ID    = 1     
Act Execute Time Histogram Template ID   = 1     
Act Estimated Cost Histogram Template ID  = 1     
Act Interarrival Time Histogram Template ID = 1     
Request Execute Time Histogram Template ID = 1     
Access Count       = 0         
Last Stats Reset Time   = 2007-12-27 13:33:05.000000
Activities HWM      = 0         
Activities Completed   = 0         
Activities Rejected    = 0         
Activities Aborted    = 0         
Associated Agents:
EDU ID    AppHandl [ nod-index ] WL ID  WLO ID  UOW ID  Activity ID
Associated Non-agent threads:
PID     TID          Thread Name         
Service Class Name    = SUBCLASS_RHETTE
Service Class ID     = 16         
Service Class Type    = Service Subclass
Parent Superclass ID   = 14         
Service Class State    = Enabled
Agent Priority      = Default
Prefetch Priority     = Default
Outbound Correlator    = None
Collect Activity Opt   = On all partitions with details and values
Collect Aggr Activity Opt = Base
Collect Aggr Request Opt = Base
Act Lifetime Histogram Template ID     = 1     
Act Queue Time Histogram Template ID    = 1     
Act Execute Time Histogram Template ID   = 1     
Act Estimated Cost Histogram Template ID  = 1     
Act Interarrival Time Histogram Template ID = 1     
Request Execute Time Histogram Template ID = 1     
Access Count       = 0         
Last Stats Reset Time   = 2007-12-27 13:33:05.000000
Activities HWM      = 0         
Activities Completed   = 0         
Activities Rejected    = 0         
Activities Aborted    = 0         
Associated Agents:
EDU ID    AppHandl [ nod-index ] WL ID  WLO ID  UOW ID  Activity ID
Associated Non-agent threads:
PID     TID          Thread Name         
Service Class Name    = SUBCLASS_DB2ADMIN
Service Class ID     = 17         
Service Class Type    = Service Subclass
Parent Superclass ID   = 14         
Service Class State    = Enabled
Agent Priority      = 6         
Prefetch Priority     = High
Outbound Correlator    = None
Collect Activity Opt   = None
Collect Aggr Activity Opt = None
Collect Aggr Request Opt = None
Act Lifetime Histogram Template ID     = 1     
Act Queue Time Histogram Template ID    = 1     
Act Execute Time Histogram Template ID   = 1     
Act Estimated Cost Histogram Template ID  = 1     
Act Interarrival Time Histogram Template ID = 1     
Request Execute Time Histogram Template ID = 1     
Access Count       = 0         
Last Stats Reset Time   = 2007-12-27 13:33:05.000000
Activities HWM      = 0         
Activities Completed   = 0         
Activities Rejected    = 0         
Activities Aborted    = 0         
Associated Agents:
EDU ID    AppHandl [ nod-index ] WL ID  WLO ID  UOW ID  Activity ID
Associated Non-agent threads:
PID     TID          Thread Name   

我们也可以通过控制中心查看系统视图 SYSDEFAULTSUBCLASS,来看一下我们创建的服务类情况,具体如图 2 所示:

图 2 . 查看已定义的服务类

讲解DB2 V9.5工作负载管理之定义服务类

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