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Optimizer Processing Rates for Auto DOP Oracle Blogs

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A common practice of users of manual DOP was to pick DOP values as object attributes based on the object size; for example, a customer could choose to set all tables

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

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Auto DOP and Parallel Statement Queuing

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Oracle 11g Release 2 (11.2) introduced some big changes associated with the control of parallel execution. This article gives an overview of Auto DOP and Parallel Statement Queuing, which can be used to give a degree of control

If you hit a bug, you can still use Auto DOP for users that will not be impacted by it. Resource manager can be used to limit DOP for a specific group of users. This can be a good idea with

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AUTOMATIC DEGREE OF PARALLELISM (DOP) PART I

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MANUAL This is the default. Disables Auto DOP, statement queuing and in-memoryparallel execution. It reverts the behavior of parallel execution to what it was previous

Configure to order (CTO) A production type which supports the option to select a base product and configure all the variable parameters associated with that product (DOP) enables the

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About Initializing and Tuning Parameters for Parallel Execution

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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

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

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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.
What is auto DOP vs manual DOP?
As opposed to manual DOP it does not require table/index decorations or hints. Here is the basic decision flow for a SQL statement with Auto DOP. The optimizer first generates a serial plan for the SQL statement and estimates the execution time. If the estimated execution time is less than the specified threshold the statement runs serially.
What happens if I enable auto DOP?
With Auto DOP since the optimizer is deciding when to use parallel execution and the DOP to use, depending on how you configure Auto DOP, the number of parallel statements and their DOPs may change when you enable it. Some serial statements may start running in parallel, some parallel statements may start running serially.
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.
How to enable auto DOP in JavaScript?
Auto DOP is enabled by setting the PARALLEL_DEGREE_POLICY parameter. Allowable values are as follows. MANUAL : (DEFAULT) Disables auto DOP, statement queuing and in-memory parallel execution. Resembled pre-11.2 behaviour. LIMITED : Enables auto DOP for statements against objects with parallel settings.