Default timer jobs for Windows SharePoint Services 3.0

The following table lists the default timer jobs for Windows SharePoint Services 3.0.

Timer job title	Description	Schedule type
CEIP Data Collection	Gathers farm data for the Customer Experience Improvement Program.	Daily
Change Log	Documents changes to sites and pages in the Web application since the last time that the timer job was run.	Daily
Database Statistics	Updates SQL Server query optimization statistics for content databases. This job was updated significantly in Windows SharePoint Services 3.0 with Service Pack 2 (SP2) to also rebuild database indexes. The job performs the following tasks: If you have not installed Windows SharePoint Services 3.0 with SP2, the job updates the query optimization statistics by performing a full scan of key tables every time that it runs, which can be resource-intensive. If you have installed Windows SharePoint Services 3.0 with SP2: The job updates the query optimization statistics by sampling key tables every time that it runs, instead of performing a full scan. If you are running Microsoft SQL Server 2005 or Microsoft SQL Server 2008, the job rebuilds all indexes in the content databases every time that it runs. If you are running an Enterprise edition of SQL Server 2005 or SQL Server 2008, the job rebuilds most indexes online. If you are running a Standard edition of SQL Server 2005 or SQL Server 2008, the job rebuilds the indexes offline. If you are running Microsoft SQL Server 2000, the job does not rebuild any indexes.	Daily, between 22:00:00 and 05:00:00
Dead Site Delete	When auto site cleanup is enabled, it deletes sites that have not been used in a certain period of time.	Daily
Disk Quota Warning	Looks for sites that have exceeded the storage quota.	Daily
Immediate Alerts	Sends out immediate and scheduled alerts.	Minutes
Recycle Bin	Looks for content in the Recycle Bins and moves it to the next stage or deletes it.	Daily
Usage Analysis	Processes the logs and aggregates usage data for each site.	Daily
Workflow	Processes workflow events that are in the scheduled items table, such as delays.	Minutes
Workflow Auto Cleanup	Deletes tasks and instances in the workflow instance table for workflows that have been marked completed more than n days in the past, where n is specified in the workflow association. Crawls through tasks and the workflow instance table.	Daily
Workflow Failover	Processes events for workflows that have failed and are marked to be retried.	Minutes
Site Collection: Delete	Added in the April Cumulative Update to perform gradual deletion of site collections. When an operation uses gradual deletion, a site collection is immediately marked as deleted, which prevents any further access to its content. The data in the deleted site collection is then deleted gradually over time by this timer job instead of all at once, which reduces its effect on Windows SharePoint Services 3.0 and SQL Server performance. Gradual deletion is available in the stsadm -o deletesite and stsadm -o mergecontentdbs operations.	Daily