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键集

键集

键集(keyset)游标类似于动态游标,也能够看到其他用户所做的数据修改,但不能看到其他用户新加的记录,也不能访问其他用户 …

(3)键集(Keyset-Type)类型的结果集。这种结果集可以包含可修改的行，在这种结果集中移动是不受限制的。

sp_cursor_list (Transact-SQL) ... 列名 reference_name 2 = 键集 concurrency 1 = 只读 scrollable ...

每个选择器都保护了一个已选键集（ed-key set），与这些键接洽关系的信道都有即将产生的特定I/O操纵。经由过程调用edKey…

When cursors generate a keyset for a result set, the query optimizer estimates the number of rows that will be returned for that result set .

A distributed partition view ( remote view ) cannot be updated using a keyset - driven cursor .

The database API cursor models assume that static, keyset-driven, and dynamic cursors are always scrollable .

However , a level 1 driver can support dynasets if it supports extended fetching and keyset-driven cursors .

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