創建測試表，truncate
SQL> conn t1/t1
Connected.SQL> create table t4 as select * from user_objects;
Table created.
SQL> truncate table t1.t4;
Table truncated.
停止業務對錶空間的操作，可以將表空間readonly，收集表的元數據，索引等信息略。
查看對象信息
SQL> conn / as sysdba
Connected.
SQL> select owner,object_name from dba_objects where object_name='T4' and owner='T1';OWNER OBJECT_NAME
------------------------------ ------------------------------
T1 T4
查詢最後一次ddl時間
SQL> select owner,object_name,data_object_id,to_char(last_ddl_time,'yyyy-mm-dd hh24:mi:ss') from dba_objects where object_name='T4' and owner='T1';OWNER OBJECT_NAME DATA_OBJECT_ID TO_CHAR(LAST_DDL_TI
------------------------------ -------------------- -------------- -------------------
T1 T4 87205 2020-03-17 12:46:40
查詢時間點對應的data_object_id
SQL> SELECT obj#,OWNER#,dataobj# FROM obj$ AS OF TIMESTAMP TO_TIMESTAMP('2020-03-17 12:46:40', 'YYYY-MM-DD HH24:MI:SS') WHERE NAME = 'T4';
OBJ# OWNER# DATAOBJ#
---------- ---------- ----------
87204 83 87204
創建新的表空間防止數據被覆蓋
SQL> create tablespace test datafile size 100m;Tablespace created.
SQL> create table t4 tablespace test as select * from t1.t4 where rownum<1;
Table created.
修改dataobj#
SQL> update obj$ set dataobj#=87204 where obj#=87204;
1 row updated.
SQL> commit;
Commit complete.
SQL> alter system flush shared_pool;
System altered.
查看錶已顯示object no longer exists
SQL> select * from t1.t4
2 ;
select * from t1.t4
*
ERROR at line 1:
ORA-08103: object no longer exists
恢復數據到新建的表
declare
v_fno number;
v_s_bno number;
v_e_bno number;
v_rowid rowid;
nrows number;
begin
for i in (select relative_fno,block_id,blocks
from dba_extents
where owner='T1' and segment_name='T4' and extent_id=0
union all
select relative_fno,block_id,blocks
from dba_free_space
where tablespace_name in
(select tablespace_name
from dba_tables
where owner='T1' and table_name='T4')
union all
select relative_fno,block_id,blocks from (
select relative_fno,block_id,blocks,row_number()over(partition by owner,segment_name,PARTITION_NAME order by extent_id desc) rn
from dba_extents
where tablespace_name in
(select tablespace_name
from dba_tables
where owner='T1' and table_name='T4') and extent_id>0)
where rn=1) loop
v_fno:=i.relative_fno;
v_s_bno:=i.block_id;
v_e_bno:=i.block_id+i.blocks-1;
for j in v_s_bno .. v_e_bno loop
begin
for x in 0 .. 999 loop
v_rowid:=dbms_rowid.rowid_create(1,87204,v_fno,j,x);
insert into sys.T4 select * from T1.T4 where rowid=v_rowid;
end loop;
exception
when others then
null;
end;
commit;
end loop;
end loop;
end;
/
查看數據
SQL> select * from t4;OBJECT_NAME SUBOBJECT_NAME OBJECT_ID DATA_OBJECT_ID OBJECT_TYPE CREATED LAST_DDL_ TIMESTAMP STATUS T G S NAMESPACE EDITION_NAME
-------------------- ------------------------------ ---------- -------------- ------------------- --------- --------- ------------------- ------- - - - ---------- ------------------------------
T4 87204 87204 TABLE 17-MAR-20 17-MAR-20 2020-03-17:12:46:14 VALID N N N 1
T11 87190 87190 TABLE 17-MAR-20 17-MAR-20 2020-03-17:11:47:11 VALID N N N 1
T3 87203 87203 TABLE 17-MAR-20 17-MAR-20 2020-03-17:12:45:25 VALID N N N 1
將dataobj#改回原值時插入也一樣報錯
SQL> update obj$ set dataobj#=87205 where obj#=87204;
1 row updated
SQL> alter system flush shared_pool;
System altered.
SQL> select * from t1.t4;
no rows selected
SQL> insert into t1.t4 select * from t4;
insert into t1.t4 select * from t4
*
ERROR at line 1:
ORA-00600: internal error code, arguments: [ktspfmdb:objdchk_kcbnew_3], [0], [87205], [4], [], [], [], [], [], [], [], []
刪除原表重建備份表結構插入數據重建索引
SQL> drop table t1.t4 purge;Table dropped.
SQL> create table t1.t4;
Table created.
SQL> insert into t1.t4 select * from t4;
附：
DBMS_ROWID.ROWID_CREATE (
rowid_type IN NUMBER,
object_number IN NUMBER,
relative_fno IN NUMBER,
block_number IN NUMBER,
row_number IN NUMBER)
參數：
rowid_type：rowid類型(restricted或者extended)。設置rowid_type爲0時，代表restricted ROWID（此時，將忽略參數object_number）：設置rowid_type爲1時，代表extended ROWID。
object_number：數據對象編號（僅restricted類型rowid可用）。
relative_fno：所在數據文件編號。
block_number：該數據文件中的數據塊編號。
row_number：在該塊中的行編號。