Configuring and Controlling Auto DOP
This is the parameter used to enable/disable Auto DOP system-wise or session-wise. The default value of this parameter is MANUAL which disables Auto DOP. With this setting the DOP of a statement will be determined by table/index decorations and hints. This does not mean that you cannot use Auto DOP as you can still use hints to request Auto DOP
Configuring and Controlling Auto DOP - Oracle
There are two ways to enable/disable Auto DOP, you can enable/disable it for the whole system or for a session using the initialization parameter parallel_degree_policy, or you can enable/disable it for specific SQL statements using hints. PARALLEL_DEGREE_POLICY This is the parameter used to enable/disable Auto DOP system-wise or session-wise.
Setting the Degree of Parallelism - Oracle Help Center
This setting enables Auto DOP, parallel statement queuing, and in-memory parallel execution, similar to the AUTO value. In addition, performance feedback is enabled. The PARALLEL_DEGREE_LIMIT initialization parameter specifies the maximum DOP that Auto DOP can use systemwide. For a more fine grained control of the maximum DOP, you can use
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About Initializing and Tuning Parameters for Parallel Execution
Controls the maximum DOP a statement can have when automatic DOP is in use. The maximum DOP is . SUM(CPU_COUNT)*PARALLEL_THREADS_PER_CPU. The value AUTO for PARALLEL_DEGREE_LIMIT has the same functionality as the value CPU. PARALLEL_DEGREE_POLICY. MANUAL. Controls whether auto DOP, parallel statement queuing and in-memory parallel execution are
- How to configure and control auto DOP?
- Now, let's look at how you can configure and control Auto DOP. There are two ways to enable/disable Auto DOP, you can enable/disable it for the whole system or for a session using the initialization parameter parallel_degree_policy, or you can enable/disable it for specific SQL statements using hints.
- How to enable/disable Auto DOP in SQL Server?
- There are two ways to enable/disable Auto DOP, you can enable/disable it for the whole system or for a session using the initialization parameter parallel_degree_policy, or you can enable/disable it for specific SQL statements using hints. This is the parameter used to enable/disable Auto DOP system-wise or session-wise.
- How do I limit the DOP computed by the optimizer with auto DOP?
- The DOP computed by the optimizer with Auto DOP can be quite high depending on the resource requirements of the statement. You can limit the DOP using the initialization parameter parallel_degree_limit or Database Resource Manager (DBRM). This parameter limits the DOP that can be computed by the optimizer.
- What is auto DOP in SQL Server?
- For all other statements manual DOP will be used. When you set this parameter to AUTO, Auto DOP is applied to all statements regardless of the table/index DOP decorations unless those statements set a specific DOP using hints. Regardless of what you set for parallel_degree_policy you can request Auto DOP for SQL statements using the hint PARALLEL.
- Does DBRM initialization parameter affect auto DOP?
- This parameter has no effect on statements not using Auto DOP. So, for any SQL statement that the optimizer decides to run in parallel with Auto DOP, it takes into account the initialization parameters, DBRM settings, system and object statistics, and HW characteristics to compute the DOP.
- What is a limited DOP parameter?
- When you set this parameter to LIMITED, Auto DOP is applied to statements accessing tables/indexes decorated with the default DOP unless those statements set a specific DOP using hints. For all other statements manual DOP will be used.
