database startup. Memory will be allocated even if we don't plan to create restore point ...
SQL> select current_scn from v$database; (方法二,SQL> create restore point abc [gurantee flashback database]; //“gurantee flashback database”选项可保证abc点(SCN)以来的闪回日志一直存在,不受retention影响) CURRENT_SCN --- 7248690 4.2)删除scott用户 SQL> drop user scott cascade; 4.3)准备到mo...
it might take minutes to damage a database but hours to recover. Correcting an error takes about as long as it took to make it with Flashback. In addition, the time required to recover from this error is not dependent on the database size, a capability unique to the Oracle Database. ...
it might take minutes to damage a database but hours to recover. Correcting an error takes about as long as it took to make it with Flashback. In addition, the time required to recover from this error is not dependent on the database size, a capability unique to the Oracle Database. ...
Oracle Flashback Technology is a group of Oracle Database features that let you view past states of database objects or to return database objects to a previous state without using point-in-time media recovery.
那么我们如何查询到过去某个时刻的数据(从undo segment上)呢, Oracle 9i支持两种方式,一种是SCN(system change number),另外一种是timestamp。 Oracle10g R2 增加了一种方式,叫做restore point, 这个接下来都会介绍到。 提到flashback, 可能会容易想到oracle 10g引入了flash recovery area(FRA)的概念,这个跟flashbac...
Oracle Database Backup and Recovery User's Guide and the ALTER DATABASE ... flashback_mode_clause for information on putting the database in FLASHBACK mode CREATE RESTORE POINT for information on restore points and guaranteed restore points Syntax flashback_database::= Description of the ...
Oracle Database - Enterprise Edition – 版本 10.2.0.4 到 11.1.0.7 [Release 10.2 到 11.1] 本文信息适用于任何平台。 目的 本文介绍了如何使用闪回数据库从一个DROP TABLESPACE语句中恢复。 范围 要使用闪回数据库从DROP TABLESPACE中恢复,必须满足以下条件: ...
1)restore point no guarantee flashback database 1@@@prepare SQL> create table fb_rp(a number); Table created. SQL> create restore point fb_rp1; Restore point created. SQL> select GUARANTEE_FLASHBACK_DATABASE,SCN,TIME from v$restore_point; GUA...
从这里我们可以很容易的看到不同文件所使用的不同BLOCK_SIZE,Oracle通过不同的块大小来优化存储及访问。 <闪回日志的删除> 1.- First of all we need to check if there is any guaranteed restore point defined: select name,scn,time,database_incarnation#,guarantee_flashback_database,storage_size from v$...