SHARED_POOL_RESERVED_SIZE

Property	Description
Parameter type	Big integer
Syntax	`SHARED_POOL_RESERVED_SIZE =` `integer` `[K \| M \| G]`
Default value	5% of the value of `SHARED_POOL_SIZE`
Modifiable	No
Range of values	Minimum: `5000` Maximum: one half of the value of `SHARED_POOL_SIZE`

SHARED_POOL_RESERVED_SIZE specifies (in bytes) the shared pool space that is reserved for large contiguous requests for shared pool memory.

You can use this parameter to avoid performance degradation in the shared pool in situations where pool fragmentation forces Oracle to search for and free chunks of unused pool to satisfy the current request.