关于 Site Maintenance 中预定义的 Tasks
在 Site Maintenance 下存在两个节点，一个是 SQL Commands 【 默认为空，需要自定义 SQL 语句 】，一个是预定义的 Tasks 【不能新增，只能在已经的存在的 Task 上做配置】。
Backup ConfigMgr Site Server (默认关闭)
作用：可以设置对 Site Database 的备份时间和备份路径。
默认每周日零点开始。
Clear Install Flag (默认关闭)
作用：如果在设定的“Client Rediscovery Period”这个时间内，没有收到 Client 发送的 Heartbeat Discovery 信息则将清除掉 Client 客户机已经安装 SCCM Client的标识，这样就可以再次安装 client。
注意：如果开启这个 Task，
1.
要确保开启 Heartbeat Discovery；
2.
要设置“Client Rediscovery Period”的时间比 Heartbeat Discovery 时间要长，根据公司情况设置一个合理的倍数。（起码1.5倍，3倍以上是比较保险的）
默认21天。
Delete Aged Client Access License Data (默认关闭)
Client Access License：Many Microsoft server products utilize the Client Access License (CAL) model, including Exchange Server, SQL Server, and Systems Management Server. For a list of Microsoft products for which CALs are required, see the Microsoft CAL Guide (http://go.microsoft.com/fwlink/?LinkId=91230).
At this time, Configuration Manager 2007 only tracks CALs for Windows Server and Exchange Server.
默认180天。
Delete Aged Collected Files (默认开启)
Collected Files 是指从 site database 和 site server folder structure 中收集的 files data.
The Delete Aged Collected Files task is used to delete aged collected files data from the Configuration Manager 2007 site database and from the site server folder structure at the selected site only. Databases at other sites are not affected.
Once collected, files specified to be collected will only be collected during subsequent inventories if they have changed since the previous inventory. By default, the five most recent copies of collected files are stored on the site server in the inboxes\sinv.box\FileCol directory.
默认90天。
Delete Aged Computer Association Data (默认开启)
Computer Association Data 是指通过 OSD 方式完成系统按照并还原用户状态之后删除的计算机关联记录信息。
默认30天。
Delete Aged Configuration Management Data (默认开启)
Configuration Management Data：在修改 DCM、SUM、OSD 配置后，site database 会相应更新到最新的配置，而原有的配置信息仍然保存在 database 中。当 Client 都接收到新的配置 policy 之后（即不再根据老的 policy 报告其状态），和老的 policy 相关的信息将会根据配置的周期进行清除。
默认90天。
When changes are made to configuration items created when using desired configuration management, software updates management, or operating system deployment, the site database is updated with the new configuration item definition. The original configuration item definition is also stored in the site database. When clients have stopped reporting the original configuration item definition, the definition and any configuration item compliance history associated with that version is removed from the database according to the schedule you have specified.
Delete Aged Discovery Data (默认开启)
Discovery Data：包括通过 heartbeat discovery、network discovery、and Active Directory Domain Services discovery methods (System, User, and System Group) 获得的记录。
默认90天。
Delete Aged Inventory History (默认开启)
【似乎只和 hardware inventory 有关】
If the hardware inventory client agent is enabled at a site, or at any of its child sites, the Delete Aged Inventory History task deletes all client hardware inventory history data older than the number of days specified. The inventory history data is deleted from the Configuration Manager 2007 site database at the selected site only. After this task runs, only the current inventory data is left in the Configuration Manager 2007 site database. Site databases at other sites are not affected.
Defaults： Delete hardware inventory data older than 90 days; runs on Saturday between midnight and 5:00 A.M.
Delete Aged Software Metering Data (默认开启)
The minimum number of days that you can set to delete all software usage data is two. The maximum number is 255.
Defaults： Deletes software usage data older than five days; runs daily.
Delete Aged Software Metering Summary Data (默认开启)
【不清楚这里的 summary 到底是干了什么】
Delete Aged Status Messages (默认开启)
Defaults： Deletes status messages older than seven days; runs daily between midnight and 5:00 A.M.
Delete Inactive Client Discovery Data (默认关闭)
Clients 会被标识为 inactive 的两种情况：
1. When a client is flagged as obsolete it is also marked as inactive.
2. Clients can be marked inactive by the client health tool if the tool is configured to mark clients as inactive.
注意：The client health tool is not included in Configuration Manager Setup and must be downloaded and installed separately.
Delete Inactive Client Discovery Data 和 Delete Aged Discovery Data 比较相似，但是前者只针对 SCCM 2007 Client 操作，后者可以针对所有 discovered 的资源。
如果启用，其时间必须长于 Heartbeat 时间。This allows active clients to send a Heartbeat Discovery record to mark their client record as active so that this task does not delete them.
Defaults： Delete inactive client discovery data older than 90 days; Runs on Saturday between midnight and 5:00 A.M.. Not enabled by default.
Delete Obsolete Client Discovery Data (默认关闭)
一个新的记录会造成这个 Client 原有记录的obsolete。The newer record becomes the client’s current record, and the older record becomes obsolete.
如果开启这个任务，要保证其时间长于 heartbeat 时间。This allows clients to send Discovery Data Records (DDRs) so that the obsolete bit is set correctly.
Defaults：Deletes obsolete client discovery data older than seven days; runs on Saturday. This task is not enabled by default.
Monitor Keys (默认开启)
这个任务的作用是监视 database primary keys 的完整性。A primary key is a column or combination of columns that uniquely identify one row and distinguish it from any other row in a Microsoft SQL Server database table.
Defaults：Runs every Sunday, between midnight and 5:00 A.M.
Rebuild Indexes (默认开启)
作用：重建 SCCM 2007 site database 使用的 indexes。An index is a database structure created on a database table to speed up data retrieval. For example, searching an indexed column is often much faster than searching a column that is not indexed.
To improve performance, the Configuration Manager 2007 site database indexes are frequently updated to remain synchronized with the constantly changing data stored in the database. This task creates indexes on database columns that are at least 50 percent unique, drops indexes on columns that are less than 50 percent unique, and rebuilds all existing indexes that meet the data uniqueness criteria.
Defaults：Runs every Sunday, between midnight and 5:00 A.M.
Summarize Client Access License Weekly Usage Data (默认关闭)
Defaults：Not enabled. Runs on Saturday between midnight and 5:00 A.M.
Summarize Software Metering File Usage Data (默认开启)
作用：summarizes software metering file usage data from multiple records into one general record. This record provides summarized information about the application name, version, language, number of concurrent users, and hourly usage over a specified length of time. Data summarization helps compress the amount of data stored in the Configuration Manager 2007 site database.
This task can be used with the Summarize Software Metering Monthly Usage Data task to summarize software metering data, and to conserve space in the Configuration Manager 2007 site database.
Defaults：Runs daily, between midnight and 5:00 A.M.
Summarize Software Metering Monthly Usage Data (默认开启)
Defaults：Summarizes messages older than one month; runs daily, between midnight and 5:00 A.M.
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Tags: 2007, Maintenance, SCCM, Site, Task