Oracle9i Database Reference Release 2 (9.2) Part Number A96536-01 |
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Initialization Parameters, 154 of 222
Parameter type |
Integer |
Default value |
|
Parameter class |
Dynamic: |
Range of values |
0 to 100 |
Real Application Clusters |
Multiple instances can have different values. |
PARALLEL_MIN_PERCENT
operates in conjunction with PARALLEL_MAX_SERVERS
and PARALLEL_MIN_SERVERS
. It lets you specify the minimum percentage of parallel execution processes (of the value of PARALLEL_MAX_SERVERS
) required for parallel execution. Setting this parameter ensures that parallel operations will not execute sequentially unless adequate resources are available. The default value of 0
means that no minimum percentage of processes has been set.
Consider the following settings:
PARALLEL_MIN_PERCENT = 50 PARALLEL_MIN_SERVERS = 5 PARALLEL_MAX_SERVERS = 10
If 8 of the 10 parallel execution processes are busy, only 2 processes are available. If you then request a query with a degree of parallelism of 8, the minimum 50% will not be met.
You can use this parameter in conjunction with PARALLEL_ADAPTIVE_MULTI_USER
. In a multi-user environment, an individual user or application can set PARALLEL_MIN_PERCENT
to a minimum value until sufficient resources are available on the system and an acceptable degree of parallelism is returned.
See Also:
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