1.250 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