This provides information the instance name, number,snapshot ids,total time the report was taken for and the database time during this elapsed time.Įlapsed time= end snapshot time - start snapshot timeĭatabase time= Work done by database during this much elapsed time( CPU and I/o both add to Database time).If this is lesser than the elapsed time by a great margin, then database is idle.Database time does not include time spend by the background processes.Ģ)Cache Sizes : This shows the size of each SGA region after AMM has changed them. To address this, in 11g, maintenance operations are closely linked to resource manager to manage the resources that are used and share them more efficiently.ĪWR report is broken into multiple parts. Maintenance operations can potentially use a lot of resource which may, in extreme cases, affect other jobs. 'Automatic Maintenance Tasks Management ' is an 11g new feature and was implemented to increase the flexibility of statistics collection and to avoid potential resourcing issue when maintenance jobs run alongside user operations. Using Enterprise Manager is the preferred way to control Automatic Maintenance Tasks, although the DBMS_AUTO_TASK_ADMIN package can also be used. One can query dba_scheduler_windows to check the window definitions.Īutomatic Maintenance Tasks (including the automated Optimizer Statistics Gathering task) are defined to execute within these daily windows. These were replaced in order to add increased flexibility and manageability.
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In Oracle Database 11g, the WEEKNIGHT_WINDOW and WEEKEND_WINDOW schedules (defined in Oracle Database 10g) are replaced with daily maintenance windows (such as SUNDAY_WINDOW, MONDAY_WINDOW etc). This included statistics collection by means of the GATHER_STATS_JOB. Oracle Database 10g introduced the concept automated maintenance task execution during maintenance windows implemented via a WEEKNIGHT_WINDOW and WEEKEND_WINDOW schedule. Select count(*) from dba_scheduler_job_log where additional_info like '%GATHER_STATS_PROG%' Select * from dba_autotask_client where client_name = 'auto optimizer stats collection' To check if it exists and enabled, use this simple SQL. In 11g, this job is part of the daily Oracle Maintenance window, but it is executed as an autotask. If you are looking for the GATHER_STATS_JOB in Oracle 11g, then stop looking.
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