ob-robot

## Use Case A user encountered the problem of emergency extension when the disk water level exceeded 95%. When the data disk exploded, if the writing operation was not stopped,...

## Use Case Support READ UNCOMMITTED isolation level. We would like to use READ COMMITTED to realize the READ UNCOMMITTED level.

## Use Case Before disconnecting, an error packet will be returned first and then disconnected to help troubleshoot the disconnection

## Use Case Support "DROP USER IF EXISTS"

## Use Case If the IP specific doesn't match the network card, observer would reject to startup. If we startup oceanbase in k8s, the IP maybe doesn't match the network...

## Use Case **CPU isolation** The current situation of daily merging in version 4.x is: each tenant can define a merge initiation time, but after the cluster is launched, if...

## Use Case **Unknown system variable 'port'** It's failed to execute sql command below: ```sql select @@global.port ``` We need to support this static variable and we should record the...

### Background Currently, we use `start_service_time=active` to decide whether the system tenant in service, but we cannot decide the service status of user tenant easily. ### Solution Add a field...

In 4.1, oceanbase support tablet major freeze but doesn't have command interface.

Support compress the backup logs.