level control table 位准控制表
You also have granular control since you can back up at the table space level.
由于可以在表空间级进行备份，所以还可以进行粒度控制。
Using this feature, data stewards can control read and write access for users and groups at the table column and row level.
借助这个特性，数据管理员可以在表的列和行级别控制用户和组的读写访问。
Concurrency control Supports table and row level locking.
并发控制支持表级和行级锁。
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