Note
This view is available starting with V4.2.0.
Purpose
This view records the location range of the data dictionary in the system log stream, facilitating CDC for data dictionary consumption.
Columns
Column |
Type |
Nullable |
Description |
|---|---|---|---|
| TENANT_ID | bigint(20) | NO | The tenant ID.
|
| SNAPSHOT_SCN | bigint(20) unsigned | NO | The SNAPSHOT SCN of the tenant when the data dictionary was generated. |
| REPORT_TIME | timestamp(6) | NO | The time when the data dictionary was generated and reported to the internal table (unit: microseconds) |
| START_LSN | bigint(20) unsigned | NO | The LSN of the first log in the tenant's log stream where the data dictionary is persisted. |
| END_LSN | bigint(20) unsigned | NO | The LSN of the last log in the tenant's log stream where the data dictionary is persisted. |
Sample query
Query the location range of the data dictionaries of all user tenants in the system log stream.
obclient [oceanbase]> SELECT * FROM oceanbase.CDB_OB_DATA_DICTIONARY_IN_LOG;
The query result is as follows:
+-----------+---------------------+----------------------------+-----------+----------+
| TENANT_ID | SNAPSHOT_SCN | REPORT_TIME | START_LSN | END_LSN |
+-----------+---------------------+----------------------------+-----------+----------+
| 1002 | 1722408567371559602 | 2024-07-31 14:49:27.420098 | 9118467 | 9118467 |
| 1004 | 1722408697334096435 | 2024-07-31 14:51:37.373029 | 13706567 | 13706567 |
+-----------+---------------------+----------------------------+-----------+----------+
2 rows in set