Note
This view is available starting with V4.2.0.
Purpose
This view displays the load balancing tasks that are currently being executed for the current tenant. A tenant may have multiple load balancing tasks running at the same time, and these tasks (TASK) belong to the same load balancing job (JOB).
Columns
Column |
Type |
Nullable |
Description |
|---|---|---|---|
| TASK_ID | NUMBER(38) | NO | The ID of the load balancing task. |
| CREATE_TIME | TIMESTAMP(6) WITH LOCAL TIME ZONE | NO | The time when the task was created. |
| MODIFY_TIME | TIMESTAMP(6) WITH LOCAL TIME ZONE | NO | The time when the information was last updated. |
| TASK_TYPE | VARCHAR2(64) | NO | The type of the task. Valid values:
|
| SRC_LS | NUMBER(38) | NO | The source log stream (the log data stream generated by the data source). |
| DEST_LS | NUMBER(38) | NO | The destination log stream. |
| PART_LIST | CLOB | YES | The list of partitions, including user table partitions and global index partitions. |
| FINISHED_PART_LIST | CLOB | YES | The list of partitions that have been balanced. |
| PART_COUNT | NUMBER(38) | YES | The number of partitions in the partition list. |
| FINISHED_PART_COUNT | NUMBER(38) | YES | The number of partitions that have been balanced. |
| LS_GROUP_ID | NUMBER(38) | NO | The ID of the log stream group. |
| STATUS | VARCHAR2(64) | NO | The status of the task. Valid values:
|
| PARENT_LIST | VARCHAR2(1024) | YES | The list of parent tasks. |
| CHILD_LIST | VARCHAR2(1024) | YES | The list of child tasks. |
| CURRENT_TRANSFER_TASK_ID | NUMBER(38) | NO | The ID of the transfer task triggered by the current load balancing task. |
| JOB_ID | NUMBER(38) | NO | The ID of the job to which the current task belongs. |
| COMMENT | CLOB | YES | The comment. |
| BALANCE_STRATEGY | VARCHAR2(64) | YES | The balance strategy corresponding to the balance task. Valid values:
NoteFor V4.3.x, this column is available starting with V4.3.2. For V4.2.x, this column is available starting with V4.2.4. |
Sample query
Query the load balancing tasks that are currently being executed for the current tenant.
obclient [SYS]> SELECT * FROM SYS.DBA_OB_BALANCE_TASKS\G
The query result is as follows:
*************************** 1. row ***************************
TASK_ID: 321373
CREATE_TIME: 2025-05-09 14:45:15.602100
MODIFY_TIME: 2025-05-09 14:45:15.616452
TASK_TYPE: LS_SPLIT
SRC_LS: 1001
DEST_LS: 1002
PART_LIST: 500002:500016,500002:500015,500002:500014,500002:500013,500002:500012,500002:500011
FINISHED_PART_LIST: NULL
PART_COUNT: 6
FINISHED_PART_COUNT: 0
LS_GROUP_ID: 1001
STATUS: CREATE_LS
PARENT_LIST: NULL
CHILD_LIST: NULL
CURRENT_TRANSFER_TASK_ID: -1
JOB_ID: 321371
COMMENT:
BALANCE_STRATEGY: LS balance by expand
1 row in set
References
Query the load balancing tasks (Task) at the log stream level for the current tenant: DBA_OB_BALANCE_TASK_HISTORY
Query the load balancing jobs (Job) at the log stream level for the current tenant:
Query the load balancing tasks (Task) at the tablet level for the current tenant:
Query the transfer partition tasks (Task) for the current tenant:
For more information about data load balancing, see Data load balancing.