Note
This view is available starting with V4.2.0.
Purpose
This view displays the Transfer tasks that are being executed in the current tenant.
Columns
| Column | Type | Nullable | Description |
|---|---|---|---|
| TASK_ID | NUMBER(38) | NO | The ID of the Transfer 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 task information was last updated. |
| SRC_LS | NUMBER(38) | NO | The log stream on the source end. |
| DEST_LS | NUMBER(38) | NO | The log stream on the destination end. |
| PART_LIST | CLOB | YES | The list of partitions, including user table partitions and global index partitions. |
| PART_COUNT | NUMBER(38) | YES | The number of partitions in the partition list. |
| NOT_EXIST_PART_LIST | CLOB | YES | The list of partitions that were planned to be executed in this task but did not exist when the lock was acquired. |
| LOCK_CONFLICT_PART_LIST | CLOB | YES | The list of partitions that were planned to be executed in this task but encountered a lock conflict when the lock was acquired. |
| TABLE_LOCK_TABLET_LIST | CLOB | YES | The list of tablets that were successfully locked at the partition level when the task entered the START state. This list contains only the tablets corresponding to the partitions in the PART_LIST. |
| TABLET_LIST | CLOB | YES | The complete list of tablets involved in the Transfer operation. This list includes not only the tablets listed in the PART_LIST but also those associated with local index tables and LOB auxiliary tables. |
| TABLET_COUNT | NUMBER(38) | YES | The number of tablets in the tablet list. |
| START_SCN | NUMBER(38) | YES | The SCN at which the Transfer operation was initiated. |
| FINISH_SCN | NUMBER(38) | YES | The SCN at which the Transfer operation was completed. |
| STATUS | VARCHAR2(64) | NO | The status of the task. Valid values:
|
| TRACE_ID | VARCHAR2(64) | NO | The trace ID of the entire task. |
| RESULT | NUMBER(38) | YES | The result of the task. |
| BALANCE_TASK_ID | NUMBER(38) | NO | The ID of the associated load balancing task. This Transfer task is a subtask generated by the corresponding load balancing task. |
| TABLE_LOCK_OWNER_ID | NUMBER(38) | YES | When a table lock is acquired, the system generates an owner_id for each table lock to identify the owner of the lock. When releasing a table lock, the corresponding owner_id must be provided to ensure the system can correctly identify and release the lock. |
| COMMENT | CLOB | YES | The comment information. This field records the reason for the task being stuck, diagnostic information, and the failure details of the task. |
Sample query
Query the Transfer tasks that are being executed in the current tenant.
obclient [SYS]> SELECT * FROM SYS.DBA_OB_TRANSFER_TASKS\G
The query result is as follows:
*************************** 1. row ***************************
TASK_ID: 1
CREATE_TIME: 09-MAY-25 02.45.18.643425 PM
MODIFY_TIME: 09-MAY-25 02.45.22.093721 PM
SRC_LS: 1001
DEST_LS: 1002
PART_LIST: 500002:500011,500002:500012,500002:500013,500002:500014,500002:500015,500002:500016
PART_COUNT: 6
NOT_EXIST_PART_LIST: NULL
LOCK_CONFLICT_PART_LIST: NULL
TABLE_LOCK_TABLET_LIST: 200008,200009,200010,200011,200012,200013
TABLET_LIST: 200008:0,200009:0,200010:0,200011:0,200012:0,200013:0
TABLET_COUNT: 6
START_SCN: 1746773121749985001
FINISH_SCN: 0
STATUS: DOING
TRACE_ID: YB4*******************************************-0-0
RESULT: 0
BALANCE_TASK_ID: 321373
TABLE_LOCK_OWNER_ID: 321425
COMMENT: NULL
1 row in set
References
Query the history of Tablet-level load balancing tasks (Task) in the current tenant: DBA_OB_TRANSFER_TASK_HISTORY
Query the log stream-level load balancing jobs (Job) in the current tenant:
Query the log stream-level load balancing tasks (Task) in the current tenant:
Query the Transfer Partition tasks (Task) in the current tenant:
For more information about data load balancing, see Data load balancing.