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Guidelines | |
Archive Log Free Space (ArchFreeSpace)
The ArchFreeSpace parameter shows the number of archive logs that can fit in the amount of free space remaining on one archive destination whose BINDING is MANDATORY. However, if you have more than one archive log destination whose BINDING is MANDATORY, ArchFreeSpace will be greyed out (inactive), and you may see a blank destination in the Archiving State report.
The ArchFreeSpace parameter in the AVAILABILITY application goes offline when you load the ORACLE_ARCHIVE application. .
This parameter is supported if the instance uses ASM storage.
In case of an Instance that uses ASM storage, the ORACLE_ AVAILABILITY application class uses V$ASM_DISKGROUP_STAT view to get the free space for disk groups those are used for storing the archive log files. The free space is considered only for the disk groups those are in mounted /connected state when the query is performed from the monitored instance.
Parameter value calculation
The number of archive logs that can be generated at given location is given by
ArchFreeSpace (Availability) = Arch_file_avail/redo_log_size
ARCH_FILE_AVAIL is the free space available at a given location. The REDO_LOG_SIZE is equal to the max(BYTES) from V$LOG view.
- For an ASM destination, the ARCH_FILE_AVAIL value is obtained from the V$ASM_DISKGROUP_STAT view
- For a Flash Recovery Area destination, the ARCH_FILE_AVAIL is equal to the minimum value between OS_ARCH_FILE_AVAIL and FRA_DEST_SPACE_AVAIL
- The FRA_DEST_SPACE_AVAIL value is equal to the ((SPACE_LIMIT - SPACE_USED) + SPACE_RECLAIMABLE) value obtained from the V$RECOVERY_FILE_DEST view. If the FRA_DEST_SPACE_AVAIL value is negative set it to 0.
- The OS_ARCH_FILE_AVAIL is equal to the free space available at given location (file system location or ASM location)
Recommendations
Enable the automated recovery feature to automatically compress the log or move the log files when an alarm occurs. If the automated recovery action Compress or Move Log Files has been set, the files will be compressed or moved when this parameter goes into alarm.
If you do not enable the automated recovery action, manually back up the archive logs and remove the files to make room for new archives.
BMC PATROL properties
Attribute | Default value |
|---|---|
Application class | ORACLE_AVAILABILITY |
Command type | Not applicable |
Platform | All |
Icon style | Graph |
Unit | Number of logs |
Border range | Undefined |
Alarm1 range | 0-2 alarm |
Alarm2 range | 2-4 warn |
Scheduling(poll time) | Poll time of collector |
Active at installation | Yes |
Parameter type | Consumer |
Value set by | CollAvailability |
Annotation: | Report the destination, space used and space left. |
BMC ProactiveNet Performance Management properties
Property | Default value |
|---|---|
Monitor type | Oracle Database Availability |
Key Performance Indicator | Yes |
Monitor for abnormalities | Yes |
Graph by default | No |
Availability | No |
Response time | No |
Normal distribution | Yes |
Statistical | Yes |