闪回归档（11G新功能）远离ORA-01555错误

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1.1.1.1   闪回归档

前面闪回都是基于undo来实现的闪回，由于我们的闪回都是不确定时间的，所以就会导致ORA-01555（快照太旧或者被覆盖）、ORA-01466(表定义被改)、ORA-08180（没有快照）等错误。

1.1.1.1.1      创建表空间，默认大小500M

SQL> CREATE TABLESPACEhis_data_1 datafile ‘+DATA‘ size 500m;

Tablespacecreated.

1.1.1.1.2      创建默认闪回归档，保存天数为7天

SQL> create flashback archivedefault fba1 tablespace his_data_1 retention 7 day;

Flashbackarchive created.

1.1.1.1.3      创建闪回归档，保存天数为30天，配额为200M

SQL> create flashback archive fba2 tablespace his_data_1 QUOTA 200mRETENTION 30 day;

Flashbackarchive created.

1.1.1.1.4      为用户授权

SQL> grant flashback archive onfba1 to scott;

Grantsucceeded.

SQL> grant flashback archiveon fba2 to scott;

Grantsucceeded.

1.1.1.1.5      创建表，并开启闪回归档

SQL> create tableempsal_his(empno number,ename varchar2(10),sal number) flashback archive;（默认为fba1）

Tablecreated.

SQL> create table t(id int)flashback archive fba2;

Tablecreated.

1.1.1.1.6      向表内插入数据，并查看ALERT日志

17:07:57 SQL> insert intoscott.t select object_id from dba_objects;

75465rows created.

17:09:12 SQL> commit;

Commitcomplete

[oracle@oracle trace]$ tail -falert_oracle007.log

Thread1 advanced to log sequence 63 (LGWR switch)

 Current log# 3 seq# 63 mem# 0:/u01/app/oracle/oradata/oracle007/redo03.log

ThuMay 07 17:12:06 2015

ArchivedLog entry 60 added for thread 1 sequence 62 ID 0x958cb7c1 dest 1:

ThuMay 07 16:46:52 2015

Starting background process FBDA

Thu May 07 16:46:52 2015

FBDA started with pid=27, OS id=35751

1.1.1.1.7      重建UNDO表空间

17:11:59 SQL> create undo tablespaceundotbs2 datafile ‘+DATA‘ size 100m;

Tablespacecreated.

1.1.1.1.8      更改系统undo表空间

17:14:59 SQL> alter system setundo_tablespace=‘undotbs2‘;

Systemaltered.

1.1.1.1.9      删除系统undo表空间及数据库文件（原来）

17:56:27 SQL> drop tablespace undotbs1including contents and datafiles;

Tablespacedropped.

1.1.1.1.10 查看某个时间点表的内容

查看刚创建表没有添加内容时表里的内容

SQL> select id from t as of timestampto_timestamp(‘2015-5-7 17:05:57 ‘,‘YYYY-MM-DD hh24:mi:ss‘);

norows selected

向表内增加一条数据

SQL> insert into t values(1);

1row created.

SQL> commit;

Commitcomplete.

查看在增加数据之前表里行的条数

SQL> select count(id) from t asof timestamp to_timestamp(‘2015-5-7 18:07:04‘,‘YYYY-MM-DD hh24:mi:ss‘);

 COUNT(ID)

----------

    75465

查看在增加数据之后表里行的条数

SQL> select count(id) from t;

 COUNT(ID)

----------

    75466

norows selected

1.1.1.1.11 查看闪回归档表空间大小及配额

SQL> select flashback_archive_name,tablespace_name,quota_in_mb fromdba_flashback_archive_ts;

FLASHBACK_ARCHIVE_NAME        TABLESPACE_NAME                QUOTA_IN_MB

------------------------------------------------------------ ------------------------------

FBA1                          HIS_DATA_1

FBA2                          HIS_DATA_1                     200

1.1.1.1.12 查看闪回归档日期及保存时间及默认闪回归档

SQL> selectflashback_archive_name,to_char(CREATE_TIME,‘dd-mm_yyyy‘)created,retention_in_days,statusfrom dba_flashback_archive;

FLASHBACK_ARCHIVE_NAME        CREATED    RETENTION_IN_DAYS STATUS

---------------------------------------- ----------------- -------

FBA1                          07-05_2015                 7 DEFAULT

FBA2                          07-05_2015                30

1.1.1.1.13 查看闪回归档的表信息，

SQL> select * from dba_flashback_archive_tables;

TABLE_NAME                    OWNER_NAME                    FLASHBACK_ARCHIVE_NAME        ARCHIVE_TABLE_NAME                                   STATUS

------------------------------------------------------------ ------------------------------ ------------------------------------------------------------------

EMPSAL_HIS                    SCOTT                          FBA1                          SYS_FBA_HIST_78982（后面的数字对应的是dba_object里object_id，这个表对应的是装历史数据库块的）                                ENABLED

T                             SCOTT                          FBA2                          SYS_FBA_HIST_78983                                   ENABLED

1.1.1.1.14 查看闪回归档的基表

SQL> selecttable_name,tablespace_name from user_tables where table_name like ‘%FBA%‘;

TABLE_NAME                    TABLESPACE_NAME

------------------------------------------------------------

SYS_FBA_DDL_COLMAP_78983（记录DDL操作）      HIS_DATA_1

SYS_FBA_TCRV_78983（每一个事物、改变的信息）           HIS_DATA_1

SYS_FBA_HIST_78983（记录表实际改变的数据）

1.1.1.1.15 修改闪回归档配额为200M

SQL> alterflashback archive fba1 modify tablespace his_data_1 quota 200M;

Flashback archive altered.

1.1.1.1.16 修改闪回归档保留时间为1天

SQL> alterflashback archive fba1 modify retention1 day;

Flashback archive altered.

1.1.1.1.17 删除闪回归档

SQL> drop flashback archive fba1;

Flashback archive dropped.

         1.1.1.1.18手动清除所有归档

SQL> alterflashback archive fba2 purge all;

Flashback archive altered.

1.1.1.1.19       手动清除某时间段闪回归档

SQL> alterflashback archive fba2 purge before timestamp (systimestamp - interval ‘1‘ day);（清除一天前的，month，year）;

Flashback archive altered.

1.1.1.1.20       手动清除基于SCN的归档。
SQL> alter flashback archive fba2 purgebefor scn 1111

闪回归档（11G新功能）远离ORA-01555错误

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原文地址：http://blog.csdn.net/bzfys/article/details/45560559