1.291 SGA_MAX_SIZE
SGA_MAX_SIZE specifies the maximum size of the SGA for the lifetime of the instance.
| Property | Description |
|---|---|
|
Parameter type |
Big integer |
|
Syntax |
|
|
Default value |
Initial size of SGA at startup, dependent on the sizes of different pools in the SGA, such as buffer cache, shared pool, large pool, and so on. |
|
Modifiable |
No |
|
Modifiable in a PDB |
No |
|
Range of values |
0 to operating system-dependent |
On 64-bit platforms and non-Windows 32-bit platforms, when either MEMORY_TARGET or MEMORY_MAX_TARGET is specified, the default value of SGA_MAX_SIZE is set to the larger of the two parameters. This causes more address space to be reserved for expansion of the SGA.
On Windows 32-bit platforms, the default value of SGA_MAX_SIZE is the largest of the following values:
-
60% of
MEMORY_TARGET, if specified -
60% of
MEMORY_MAX_TARGET, if specified -
25% of the total available virtual address space
See Also:
Oracle Database Performance Tuning Guide for more information about this parameter