1.241 PARALLEL_EXECUTION_MESSAGE_SIZE

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

Property	Description
Parameter type	Integer
Default value	Operating system-dependent
Modifiable	No
Modifiable in a PDB	No
Range of values	Minimum: 2148 Maximum: 65536, but some operating systems may have a smaller value
Basic	No
Oracle RAC	Multiple instances must have the same value.

On most platforms, the default value is as follows:

• 16384 bytes if COMPATIBLE is set to 11.2.0 or higher

• 2148 bytes if COMPATIBLE is less than 11.2.0

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.

See Also:

Oracle Database VLDB and Partitioning Guide to learn how this parameter affects memory consumption for parallel operations, including parallel execution