|Oracle® Database Reference
10g Release 1 (10.1)
Part Number B10755-01
|Range of values||0 to 100|
|Real Application Clusters||Multiple instances can have different values.|
PARALLEL_MIN_PERCENT operates in conjunction with
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.