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