Note
This view is available starting with V4.2.0.
Purpose
This view displays the Transfer tasks that are being executed in all tenants.
Columns
| Column | Type | Nullable | Description |
|---|---|---|---|
| TENANT_ID | bigint(20) | NO | The tenant ID.
|
| TASK_ID | bigint(20) | NO | The ID of the Transfer task. |
| CREATE_TIME | timestamp(6) | NO | The time when the task was created. |
| MODIFY_TIME | timestamp(6) | NO | The time when the information was last updated. |
| SRC_LS | bigint(20) | NO | The source log stream (the log data stream generated by the data source). |
| DEST_LS | bigint(20) | NO | The destination log stream. |
| PART_LIST | longtext | YES | The list of partitions, including user table partitions and global index partitions. |
| PART_COUNT | bigint(20) | YES | The number of partitions in the partition list. |
| NOT_EXIST_PART_LIST | longtext | YES | The list of partitions that are planned to be executed in the current task but do not exist when the lock is acquired. |
| LOCK_CONFLICT_PART_LIST | longtext | YES | The list of partitions that are planned to be executed in the current task but encounter lock conflicts when the lock is acquired. |
| TABLE_LOCK_TABLET_LIST | longtext | YES | The list of tablets that are locked at the partition level for table lock migration when the task enters the START state. This list contains only the tablets corresponding to the partitions in the PART_LIST. |
| TABLET_LIST | longtext | YES | The complete list of tablets involved in the current Transfer operation. This list includes not only the tablets in the PART_LIST but also those associated with local index tables and LOB auxiliary tables. |
| TABLET_COUNT | bigint(20) | YES | The number of tablets in the tablet list. |
| START_SCN | bigint(20) unsigned | YES | The SCN when the Transfer operation was initiated. |
| FINISH_SCN | bigint(20) unsigned | YES | The SCN when the Transfer operation was completed. |
| STATUS | varchar(64) | NO | The task status.
|
| TRACE_ID | varchar(64) | NO | The trace ID for the entire task. |
| RESULT | bigint(20) | YES | The task result. |
| BALANCE_TASK_ID | bigint(20) | 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 | bigint(20) | 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 the table lock is released, the corresponding owner_id must be provided to ensure the system can correctly identify and release the lock. |
| COMMENT | longtext | YES | The comment information. This field records the reason for the current stall, diagnostic information, and details of the task failure. |
Sample query
Query the Transfer tasks that are being executed in the tenant with ID 1002.
obclient[oceanbase]> SELECT * FROM oceanbase.CDB_OB_TRANSFER_TASKS WHERE TENANT_ID = 1002\G
The query result is as follows:
*************************** 1. row ***************************
TENANT_ID:1002
TASK_ID: 3
CREATE_TIME: 2024-06-14 14:39:42.356430
MODIFY_TIME: 2024-06-14 14:38:44.315350
SRC_LS: 1002
DEST_LS: 1001
PART_LIST: 500224:500224,500229:500229,500234:500234,500239:500239,500244:500244,500249:500249,500254:500254
PART_COUNT: 7
NOT_EXIST_PART_LIST: NULL
LOCK_CONFLICT_PART_LIST: NULL
TABLE_LOCK_TABLET_LIST: NULL
TABLET_LIST: 200089:0,200090:0,200091:0,200092:0,200093:0,200094:0,200095:0,1152921504606847076:0,1152921504606847077:0,1152921504606847078:0,1152921504606847079:0,1152921504606847080:0,1152921504606847081:0,1152921504606847082:0,1152921504606847083:0,1152921504606847084:0,1152921504606847085:0,1152921504606847086:0,1152921504606847087:0,1152921504606847088:0,1152921504606847089:0,1152921504606847090:0,1152921504606847091:0,1152921504606847092:0,1152921504606847093:0,1152921504606847094:0,1152921504606847095:0,1152921504606847096:0,1152921504606847097:0,1152921504606847098:0,1152921504606847099:0,1152921504606847100:0,1152921504606847101:0,1152921504606847102:0,1152921504606847103:0
TABLET_COUNT: 35
START_SCN: 1718347182784953001
FINISH_SCN: 0
STATUS: DOING
TRACE_ID: YB4*************************-0-0
RESULT: 0
BALANCE_TASK_ID: 374414
TABLE_LOCK_OWNER_ID: 374434
COMMENT:
1 row in set
References
View the history of tablet-level load balancing tasks (Task) for all tenants: CDB_OB_TRANSFER_TASK_HISTORY
View the log stream-level load balancing jobs (Job) for all tenants:
View the log stream-level load balancing tasks (Task) for all tenants:
View the Transfer partition tasks (Task) for all tenants:
For more information about data load balancing, see Data load balancing.