There are five steps to use the Memory Management Page. This page documents Step 1.
You can skip this step if you are satisfied with the current memory management mode and global memory allocations, however you should ensure you are satisfied before you fine tune memory components. You should review all your changes against the charts. Remember, you can use this page to investigate the impact of making changes without applying those changes. If appropriate, there is a procedure to apply changes as documented in the last step.
To use the Memory Management Page
Select A Memory Management Mode
When you open the Memory Management page the current memory management mode is selected.
Select a different mode to view the hypothetical status of Oracle memory components under that mode.
| Mode | Description |
|---|---|
| Manual | Automatic memory management is OFF. |
| Auto SGA Only (ASMM) | Automatic shared memory management is ON for the SGA (System Global Area). |
| Auto Memory (AMM) |
Automatic memory management is ON for the SGA and PGA (Program Global Area). Note: Available for Oracle 11g and later. |
Allocate Global Memory
When you open the Memory Management page the current memory sizes for the system and database are displayed.
Click Edit to view the hypothetical effects of memory reallocation.
Spotlight will comment on the changes. Spotlight's comments may suggest you take further action. The comments may state Spotlight's calculation on memory usage in the selected mode.
Review the effect of the changes: Review Your Changes Against The Charts.
| Memory | Description | Applicable Modes |
|---|---|---|
| Total Physical Memory |
The total amount of physical memory on the host machine. Note: Value N/A if Spotlight is not monitoring the host machine. |
All |
| Free Physical Memory |
The amount of available physical memory on the host machine. Note: Value N/A if Spotlight is not monitoring the host machine. |
All |
| Total Oracle Memory |
The total amount of physical memory allocated to Oracle processes. Note: Value N/A if Spotlight is not monitoring the host machine. |
All |
| Maximum SGA Memory |
The maximum amount of memory that can be allocated to the System Global Area. Note: Any changes you make to this value are applied only when the database is restarted. |
Manual and ASMM |
| Dynamic SGA Memory | The amount of SGA memory that can be allocated dynamically by the database at runtime. | ASMM |
| Amount of Dynamic Memory | The amount of total Oracle memory that can be allocated dynamically by the database at runtime. | AMM |
Note: When a memory area is in AUTO memory management mode, Oracle resizes the area automatically according to the current load.
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