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首页 / 数据库 / MySQL / Oracle 备份恢复:flashback闪回

flashback闪回分为三大类第一,flashback table 第二,flashback database第三,flashback query(一),开启关闭回收站         alter session setrecyclebin =on;         altersession set recyclebin= off;         altersystem set recyclebin=on;         altersystem set recyclebin=off;         1,查看回收站里的内容         show recyclebin         2,,情况回收站         purge recyclebin         3,从回收站闪回的时候         flashback table t1to before drop         flashback table"BIN$mKoYM02RCojgQAB/AQAvyw==$0" to before drop;(二)flashback query 闪回         1,select* from emp as of timestamp sysdate-1/1440; 查询一分钟以前数据库的状态         查询完毕之后我们插入数据         insertinto emp select * from emp as of timestamp sysdate-1/1440         2,用scn的方式闪回         取得系统当前的scn         (1)9i的时候我们取得scn比较麻烦         selectdbms_flashback.get_system_change_number from dual;         (2)10g之后我们可以直接从视图里查询到         select current_scnfrom v$database;          SQL>select current_scn from v$database;          CURRENT_SCN         -----------    534578         3,可以scn跟timestamp互换SQL> select scn_to_timestamp(534578)from dual; SCN_TO_TIMESTAMP(534578)---------------------------------------------------------------------------06-SEP-12 11.05.52.000000000 AMSQL> select timestamp_to_scn("06-SEP-1211.05.52.000000000") from dual; TIMESTAMP_TO_SCN("06-SEP-1211.05.52.000000000")-----------------------------------------------                                         534574scn闪回查询select * from emp as of scn 534574         4,两个scn之间的交易  闪回事物查询select xid,commit_scn,commit_timestamp,operation,undo_sqlfrom flashback_transaction_querywhere table_name="EMP" and table_owner="SCOTT" and commit_scn>=534574 andcommit_scn<=534624          (1)闪回版本查询         SQL>!date "+%F %T"         2012-09-0611:37:13         SQL>colversions_starttime for a25         SQL>colversions_endtime for a25 SQL> select versions_starttime,versions_endtime, versions_xid, versions_operation,ename,sal          fromscott.emp versions between timestamp to_timestamp("2012-09-06 11:37:13","YYYY-MM-DD HH24:MI:SS")          andmaxvalue order by VERSIONS_STARTTIME ; 做交易在查询(三)flashback database         1,,激活数据库闪回         alter databaseflashback on   ----在mount状态下         showparameter db_recoverNAME                                 TYPE        VALUE----------------------------------------------- ------------------------------db_recovery_file_dest                string     /u01/tiger/flash_recovery_areadb_recovery_file_dest_size           big integer 2G         mount状态下闪回数据库         flashback database  to scn  534574         flashbackdatabase to timestamp sysdate-10/1440创建存储点create restore point aa;select * from v$restore_point   查看存储点对应的scnflashback database restore point aa;   mount状态下恢复drop restore point aa;   删除存储点使用旧的控制文件恢复有热备的system表空间损坏的恢复相关资讯      Flashback  Oracle 备份恢复 
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