eG Monitoring
 

Measures reported by DbLogTest

All log volumes in a database instance are known collectively as the log area. The database system writes the redo log entries of transactions in the log segments of the log area. Redo log entries are needed, amongst other things, for restoring a consistent database instance state after a restart or a system breakdown. The DbLogTest monitors the usage of the log area.

Measurement Description Measurement Unit Interpretation
Total_log_memory The current size of the log area MB  
Log_memory_used The size of the log area currently utilized MB If the value of this measure grows dangerously close to the value of the Total_log_memory measure, it indicates that the log area is fast becoming full. This indicates a probable problem condition, as a full log area causes the database to shut down. To avoid this, it is recommended that you carry out log backups at regular intervals, because the database system cannot overwrite the segments in the log area until after a successful log backup.
Percent_log_used The percentage of the log area utilized Percent If the value of this measure grows dangerously close to 100%, it indicates that the log area is fast becoming full. This indicates a probable problem condition, as a full log area causes the database to shut down. To avoid this, it is recommended that you carry out log backups at regular intervals, because the database system cannot overwrite the segments in the log area until after a successful log backup.
Transaction_rate The rate of transactions to the log area Trans/Sec  
Write_trans_rate The rate of write transactions to the log area Trans/Sec  
Percent_write_trans The percentage of write transactions to the log area Percent This measure is a good indicator of the level of activity on the log area.
Log_queues The current number of log queues Number  
Queue_size The size of the log queue MB