best price Configuring and Controlling Auto DOP nigeria

  • best price Configuring and Controlling Auto DOP nigeria
  • best price Configuring and Controlling Auto DOP nigeria
  • best price Configuring and Controlling Auto DOP nigeria
  • 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 are the CPU rates used for auto DOP?
  • There are basically two CPU rates used for Auto DOP, bytes per second and rows per second. These specify how much data a single process on the CPU can process per second. All of these three processing rates are set to default values in 12.1 and they are stored in the new view V$OPTIMIZER_PROCESSING_RATE.
  • 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.
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  • 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.

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