Automated maintenance tasks are tasks that are started automatically at regular intervals to perform maintenance operations on the database. An example is a task that gathers statistics on schema objects for the query optimizer.
Automated maintenance tasks run in maintenance windows, which are predefined time intervals that are intended to occur during a period of low system load. You can customize maintenance windows based on the resource usage patterns of your database, or disable certain default windows from running. You can also create your own maintenance windows.
Oracle Database has these predefined automated maintenance tasks:
- Automatic Optimizer Statistics Collection--Collects optimizer statistics for all schema objects in the database for which there are no statistics or only stale statistics. The statistics gathered by this task are used by the SQL query optimizer to improve the performance of SQL execution.See Also:Oracle Database SQL Tuning Guide for more information on automatic statistics collection
- Automatic Segment Advisor—Identifies segments that have space available for reclamation, and makes recommendations on how to defragment those segments.You can also run the Segment Advisor manually to obtain more up-to-the-minute recommendations or to obtain recommendations on segments that the Automatic Segment Advisor did not examine for possible space reclamation.See Also:Waves auto tune exo logic. 'Using the Segment Advisor' for more information.
- Automatic SQL Tuning Advisor--Examines the performance of high-load SQL statements, and makes recommendations on how to tune those statements. You can configure this advisor to automatically implement SQL profile recommendations.See Also:Oracle Database SQL Tuning Guide for more information on SQL Tuning Advisor
- SQL Plan Management (SPM) Evolve Advisor--Evolves plans that have recently been added to the SQL plan baseline. The advisor simplifies plan evolution by eliminating the requirement to do it manually.See Also:Oracle Database SQL Tuning Guide for more information on SPM Evolve Advisor
By default, all of these automated maintenance tasks are configured to run in all maintenance windows.
Oracle Sql Tuning
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- Enabling Automated SQL Tuning in Oracle 11g To identify if Automatic SQL Tuning job is enabled and regularly running. Use the following query to determine if any Automatic SQL Tuning jobs are enabled. (SYSAUTOTUNINGTASK) or you will get the message No rows selected.
- With SGA auto-tuning, when the OLTP job runs, the buffer cache has most of the memory to allow for good I/O performance. When the DSS batch job starts later, the memory automatically migrates to the large pool so that it can be used by Parallel Query operations. Based on workload information, automatic shared memory tuning.
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