The Disk Storage panel represents Oracle database and log files on disk:
Tip: Right-click the Disk Storage icon to open Space Manager. Tools | Space Manager
Oracle database files. The level of fill in this component corresponds to the overall space utilization in the database.
The Excessive RBS Activities Alarm may occur if the RBS (rollback segments) activity exceeds a threshold.
The size of the flash cache.
Flash cache applies only to (Oracle 11g Release 2) databases running on Solaris or Linux. The Flash Cache configuration parameter DB_FLASH_CACHE_FILE must be enabled and DB_FLASH_CACHE_SIZE must be set to greater than 0 to see flash cache data on the home page and in the drilldown. If these parameters are not enabled, the Flash Cache statistic on the Spotlight home page displays "N/A" and the drilldown is unavailable.
The following alarms may be raised here:
Note: The Flash Cache statistic on the home page displays "N/A" if:
This control shows the size of the flash recovery area (flashback area) and the amount of the area that is in use.
A flashback area that is full is not desirable, but it may not be a cause for alarm unless none of the files in the area are reclaimable — see the Disk Storage | Recovery Area Page for more details.
Alarms that may be raised here include:
Note: Values in the flashback container, and in the Size and Used fields, may not be available for (Oracle 10g Release 1 and earlier).
Oracle redo logs. The fill level of the component corresponds to the number of archive logs that have not yet been archived (if archiving is enabled).
The Unarchived Logs Alarm occurs if the number of unarchived redo logs exceeds a threshold.
Details of the archive log destination(s) for redo log files. Archiving Oracle redo logs is important for safeguarding database changes and for recovery.
The information in this panel shows:
Note: (Oracle 10g and later) When ASM is used for archiving, a negative value for the Free (min) metric indicates that the ASM diskgroup does not have enough space to cope with a disk failure.