2.287 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 ifCOMPATIBLE
is set to11.2.0
or higher -
2148
bytes ifCOMPATIBLE
is less than11.2.0
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