Summary of Memory Management Methods
Table 18-1 summarizes the various memory management methods. If you do not enable automatic memory management, then you must separately configure one memory management method for the SGA and one for the PGA.
Note:
When automatic memory management is not enabled, the default method for the instance PGA is automatic PGA memory management.Table 18-1 Memory Management Methods
| Instance | SGA | PGA | Description | Initialization Parameters |
|---|---|---|---|---|
|
Auto |
n/a |
n/a |
The database tunes the size of the instance based on a single instance target size. |
You set:
|
|
n/a |
Auto |
Auto |
The database automatically tunes the SGA based on an SGA target. The database automatically tunes the PGA based on a PGA target. |
You set:
|
|
n/a |
Auto |
Manual |
The database automatically tunes the SGA based on an SGA target. You control the PGA manually, setting the maximum work area size for each type of SQL operator. |
You set:
|
|
n/a |
Manual |
Auto |
You control the SGA manually by setting individual component sizes. The database automatically tunes the PGA based on a PGA target. |
You set:
|
|
n/a |
Manual |
Manual |
You must manually configure SGA component sizes. You control the PGA manually, setting the maximum work area size for each type of SQL operator. |
You must manually configure SGA component sizes. You set:
|
See Also:
Oracle Database Administrator's Guide because automatic memory management is not available on all platforms