oracle回收站recyclebin对象删除机制（Oracle recycle bin recyclebin object deletion mechanism）.docVIP

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oracle回收站recyclebin对象删除机制（Oracle recycle bin recyclebin object deletion mechanism）.doc

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oracle回收站recyclebin对象删除机制（Oracle recycle bin recyclebin object deletion mechanism）

oracle回收站recyclebin对象删除机制（Oracle recycle bin recyclebin object deletion mechanism） The Recyclebin object deletion mechanism, the release of space 1. what is Recycle Bin In fact, Recycle Bin is a preserved by a data dictionary table drop object. So, you can query the recycle bin information through the following statement: Select * from recyclebin Unless you have SYSDBA permissions, each user can only see the object of their own. So, for the user, as everyone have their own recycling station. Even if the user has to delete other schema object, also can see the object of their own in recyclebin. The following drop will not be related to put an object in RecycleBin: Drop tablespace: the object RecycleBin all belong to the elimination of tablespace Drop user: will RecycleBin all objects belonging to the user to remove Drop cluster: will RecycleBin all belong to the cluster member of the object removal Drop type: will all depend on the object in RecycleBin type clearance The RecycleBin object will be automatically in accordance with the rules of renaming, this is to avoid naming conflicts. Naming format: BIN$unique_id$version Where unique_id is the object of the 26 character identifier, version is the version number of the objects in the database. 2. how to enable / disable RecycleBin By setting the initialization parameter recyclebin, you can control whether to enable the recycle bin function is turned on by default. SQL alter system set recyclebin=off; The system has been changed. SQL alter system set recyclebin=on; The system has been changed. SQL alter session set recyclebin=off; The session has been changed. SQL alter session set recyclebin=on; The session has been changed. 3. how to view the information in RecycleBin As already mentioned, the user can view their own drop object through the recyclebin query. SQL select object_name, object_type from dba_objects where object_name=RECYCLEBIN; OBJECT_NAME OBJECT_TYPE , RECYCLEBIN SYNONYM SQL select owner, synonym_name,