What is Auto DOP? - Oracle
Auto DOP relieves the burden of deciding on a DOP for each statement and enables you to focus on optimizing the whole workload together with Parallel Statement Queuing and Database Resource Manager. We will talk about how these work together in later posts.
Configuring and Controlling Auto DOP - Oracle
Now, let's look at how you can configure and control Auto DOP. How to enable/disable 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.
Setting the Degree of Parallelism - Oracle Help Center
The optimizer uses the cost of all scan operations, such as a full table scan or index fast full scan, and the cost of all CPU operations in the execution plan to determine the necessary DOP. However, the optimizer limits the actual maximum DOP to ensure parallel execution servers do not overwhelm the system.
Purchasing policies overview - Supply Chain Management
Example 1: Simple purchasing policy configuration Organizations that are small and less complex can set up purchasing policies by legal entity, and can use only the Companies organization hierarchy. For Fabrikam, a small business, purchasing requirements vary little across the organization.
DOP operator panels | SEW-EURODRIVE
DOP11C operator panels perform comprehensive, complex visualization tasks. The more complex the system or machine and the more sophisticated the automation, the more system operators want sophisticated machine visualization. The ability to store the extensive data packages and parameter sets is also at the top of their wish lists.
- 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 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 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.
- 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 the default DOP value?
- The default value of this parameter is CPU which means the maximum DOP you can get is the default DOP which is parallel_threads_per_cpu * SUM (cpu_count). Even if you increase this parameter's value to be higher than the default DOP, the optimizer will always limit the DOP at default DOP.
- 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.
