ORA-04021
Cause
There is a lock on a library object when doing the export.
Error: ORA 4021
Text: time-out occurred while waiting to lock object
-------------------------------------------------------------------------------
Cause: While trying to lock a library object, a time-out occurred.
Action: Retry the operation later.
Bug 3386590 4021: TIMEOUT OCCURRED WHILE WAITING TO LOCK OBJECT
Fixed In Ver: 10.2.
ORA-04021说明正在遇到LIBARY CACHE PIN ，LIBARY CACHE LOCK
等会再去做吧
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/7728585/viewspace-668154/ ，如需转载，请注明出处，否则将追究法律责任。
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ORACLE VPD AND FGA
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