单词：shared lock
shared lock的用法和样例：
例句
- This means that shared locks are placed on the two pages that contain the rows that you must have to satisfy your query.这意味着共享锁放置在这两个包含必须用来满足查询的行的页上。
- Row versioning removes the need for requesting share locks on rows that have been read.行版本控制不需要对已读取的行请求共享锁。
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