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Referential Integrity (324)

原创 IT综合 作者:tsinglee 时间:2007-12-07 12:14:59 0 删除 编辑

Because Oracle does not use read locks in either read-consistent or serializable
transactions, data read by one transaction can be overwritten by another. Transactions
that perform database consistency checks at the application level cannot assume that
the data they read will remain unchanged during the execution of the transaction even
though such changes are not visible to the transaction. Database inconsistencies can
result unless such application-level consistency checks are coded with this in mind,
even when using serializable transactions.

1. 无论在已提交读取隔离模式还是串行化隔离模式中,Oracle 都不会使用读取锁


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