|
Parameter type
|
Big integer
|
|
Syntax
|
LARGE_POOL_SIZE = integer [K | M | G]
|
|
Default value
|
0 if both of the following are true:
- The pool is not required by parallel execution
DBWR_IO_SLAVES is not set
Otherwise, derived from the values of PARALLEL_MAX_SERVERS, PARALLEL_THREADS_PER_CPU, CLUSTER_DATABASE_INSTANCES, DISPATCHERS, and DBWR_IO_SLAVES.
|
|
Parameter class
|
Dynamic: ALTER SYSTEM
|
|
Range of values
|
300 KB to at least 2 GB (actual maximum is operating system-specific)
|
LARGE_POOL_SIZE lets you specify the size (in bytes) of the large pool allocation heap. The large pool allocation heap is used in shared server systems for session memory, by parallel execution for message buffers, and by backup processes for disk I/O buffers. (Parallel execution allocates buffers out of the large pool only when PARALLEL_AUTOMATIC_TUNING is set to true.)
Caution:
When Oracle derives a default value, it adds 250K for each session for the shared server if DISPATCHERS is configured. The final derived value also includes a port-specific amount of memory for backup I/O buffers. The total derived default value can either be too large to allocate or can cause performance problems. In that case, set LARGE_POOL_SIZE to a number sufficiently small so that the database can start.
|
You can specify the value of this parameter using a number, optionally followed by K or M to specify kilobytes or megabytes, respectively. If you do not specify K or M, then the number is taken as bytes.
