It returns the most recently committed version of the rows, even if another concurrent session holds an exclusive row-level lock.
即使另一个并发会话持有一个独占式行级锁，它仍然返回最近提交的行。
These locks could be table level, row level, or lock on index, and so on.
这些锁可以是表级锁、行级锁、索引锁等等。
Tables created by Informix default to page-level locking, so when two or more users attempt to update a row on the same page, at least one will get a lock error.
Informix 创建的表默认执行了页面级锁定，所以当两个或更多用户尝试更新同一页面中的一行时，至少一个用户将获得锁定错误。
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