LARGE_POOL_SIZE specifies (in bytes) the size of the large pool allocation heap.

Property Description

Parameter type

Big integer


LARGE_POOL_SIZE = integer [K | M | G]

Default value

If SGA_TARGET is set, but a value is not specified for LARGE_POOL_SIZE, then the default is 0 (internally determined by the Oracle database). If LARGE_POOL_SIZE is specified, then the user-specified value indicates a minimum value for the memory pool.

If SGA_TARGET is not set, then the default is 0.



Modifiable in a PDB


Range of values

Minimum: the granule size

Maximum: operating system-dependent



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 SGA_TARGET is set.

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.

See Also:

Oracle Database Performance Tuning Guide for more information on setting this parameter