During an export operation, row-level locking is applied to the exporting table, which means that only one lock is held at a time.
在导出操作期间，行级别锁定应用于导出表(exporting table)，这意味着一次只持有一个锁。
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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