- Disable Auto Sql Tuning Task Force
- Disable Auto Sql Tuning Taskbar
- Disable Sys_auto_sql_tuning_task
- Disable Automatic Sql Tuning Task
Jan 21, 2015 Solution: The explanation is that the AUTO SQL TUNING TASK has been over-running and as a protective measure it is auto killed. As thus, there is no fix for this and the solution is to disable this job and eventually manually execute it when needed. Stop/Enable/Disable Oracle Auto Task Jobs Using SQL – Space advisor, Optimiser stats collection, SQL tuning advisor Oracle 11g onwards there are three different automatic maintenance tasks: 1. Summary You can create an SQL TUNING TASK manually ad hoc with the following simple steps. ALTER SESSION SET NLSLANGUAGE='AMERICAN'; 0. Find the sqlid of. Disable AWR with Oracle provided script Use the script dbmsnoawr.plb provided in MOS Doc ID 1909073.1 to disable AWR once the database has been created. To install, run the package as SYS from SQL.Plus: SQL @dbmsnoawr.plb To execute the package, use the command: SQL begin dbmsawr.disableawr; end.
Database optimizer runs very fast and must select the best execution plan for a query within fraction of seconds.
Due to time constraint (under normal query execution), sometimes optimizer will choose wrong execution plan for a query.
We can force to run database optimizer to run a tuning mode so that optimizer can perform more analysis on a given SQL.
Note: use sql tuning advisor only on highly resource intensive queries.
Some of the analysis performed by the optimizer when it is running in tuning mode are:
- Statistical analysis
- Access path analysis
- SQL structure analysis
Create tuning task
First of all get the sql id of the statement that you would like to tune. You can get this information via AWR report or other database reports.
Execute tuning task
Once the task is defined, you must execute it
Status of tuning task
Once you execute the tuning task, you should be able to find the status of the task
Disable Auto Sql Tuning Task Force
Display recommendations
Once the tuning task is executed successfully, the recommendations can be displayed using below Reaktor 6.
Drop tuning task
Once you get the recommendations, you can drop the tuning task
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I find myself forgetting how to disable Oracle AUTO_TASKs on a regular basis. Therefore, I have decided to document it in this small blog post. As an additional bonus, I may hear others’ experience in the area. So if you disagree or have some other experience, please do not hesitate to comment under this post.
Why
You may ask: Why would anyone like to disable ‘auto space advisor’, ‘sql tuning advisor’ or ‘auto optimizer stats collection’? My current thinking is as follows:
- What’s the point to run advisors if no one is using the results? (Skip this point if you are using advisors; for most of my clients this argument works well.)
- Advisors may require (and I believe those do) additional Tuning licence. (If you don’t have a licence, you are wasting expensive CPU resources.)
- Some applications (such as Oracle E-Business Suite) have their own statistic-gathering jobs, and you should disable the seeded job.
- In many cases, it is easier and cheaper to disable auto tasks than to troubleshoot them (assumption – no one using auto tasks results).
Just to remind you that all: 3 tasks are enabled by default independently whether you update your database to 11G or create a database from scratch.
Disable Auto Sql Tuning Taskbar
How
SQL output example:
My reason
In my case, I was paged from one of the targets on the following error:
Disable Sys_auto_sql_tuning_task
The trace file indicates that the process was executing SQL Advisor routine at the time of the error.
Don’t forget to comment and share your experiences!
Disable Automatic Sql Tuning Task
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