ORA-01555 快照过旧--详细解释

• 　　~~~~~~~~~~~~~
  　　There are other special cases that may result in an ORA-01555. These are given below but are rare and so not discussed in this article :
  　　
  　　o Trusted Oracle can return this if configured in OS MAC mode. Decreasing LOG_CHECKPOINT_INTERVAL on the secondary database may overcome the problem.
  　　
  　　o If a query visits a data block that has been changed by using the Oracle discrete transaction facility then it will return ORA-01555.
  　　
  　　o It is feasible that a rollback segment created with the OPTIMAL clause maycause a query to return ORA-01555 if it has shrunk during the life of the query causing rollback segment information required to generate consistent read versions of blocks to be lost.
  　　
  　　Summary
  　　~~~~~~~
  　　This article has discussed the reasons behind the error ORA-01555 "Snapshot too old", has provided a list of possible methods to avoid the error when it is encountered, and has provided simple PL/SQL scripts that illustrate the cases discussed.

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