This topic describes performance metrics related to the time consumed by transaction logs in an OceanBase cluster. You can specify a statistical period to query statistics about the time consumed by transaction logs in a single zone or on a single OBServer of an OceanBase cluster.
write_disk
Definition
The average time consumed in writing transaction logs to the disk.
Description
| Metric | Metric field name | Unit |
|---|---|---|
| write_disk | clog_write_disk_rt | Microseconds |
Calculation expression
sum(rate(ob_sysstat{stat_id="80041",@LABELS}[@INTERVAL])) by (@GBLABELS) / sum(rate(ob_sysstat{stat_id="80040",@LABELS}[@INTERVAL])) by (@GBLABELS)
sync_time
Definition
The average time consumed by each transaction log synchronization operation over the network.
Description
| Metric | Metric field name | Unit |
|---|---|---|
| sync_time | trans_commit_log_sync_rt | Microseconds |
Calculation expression
sum(rate(ob_sysstat{stat_id="30000",@LABELS}[@INTERVAL])) by (@GBLABELS) / sum(rate(ob_sysstat{stat_id="30001",@LABELS}[@INTERVAL])) by (@GBLABELS)