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Oracle® Database Reference
11g Release 2 (11.2)

Part Number E10820-03
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Property Description
Parameter type Integer
Default value Operating system-dependent
Modifiable No
Range of values Minimum: 2148

Maximum: 32768, but some operating systems may have a smaller value

Oracle RAC Multiple instances must have the same value.

PARALLEL_EXECUTION_MESSAGE_SIZE specifies the size of messages used for parallel execution (formerly referred to as parallel query, PDML, Parallel Recovery, replication).

On most platforms, the default value is as follows:

The default value is adequate for most applications. Larger values require a larger shared pool. Larger values result in better performance at the cost of higher memory use. For this reason, replication gets no benefit from increasing the size.


When PARALLEL_AUTOMATIC_TUNING is set to TRUE, message buffers are allocated out of the large pool. In this case, the default is generally higher. Note that the PARALLEL_AUTOMATIC_TUNING parameter has been deprecated.