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OceanBase DatabaseOceanBase supports multiversion concurrency control (MVCC). Data reads are snapshot reads, which do not block writes. If used in a specific way, the SELECT statements can block writes. Example:
obclient> select w_name, w_ytd, w_tax from ware where w_id=1 for update;
+------------+---------+--------+
| w_name | w_ytd | w_tax |
+------------+---------+--------+
| n1P4zYo8OH | 1200.00 | 0.1868 |
+------------+---------+--------+
1 row in set (0.01 sec)
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