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标签归档:truncate数据恢复
truncate table 无论drop storage还是reuse storage不影响数据恢复
今天有朋友咨询,truncate table有drop storage和reuse storage方式,是否影响后续的数据恢复(在没有其他覆盖的情况下),我做了一个简单的测试证明,这些都不影响truncate table的数据库恢复
创建测试环境
SQL> create table t_xifenfei tablespace USERNEW 2 as select * from dba_objects; Table created. SQL> create table t_xifenfei2 tablespace USERNEW 2 as select * from dba_objects; Table created. SQL> create table t_xifenfei3 tablespace USERNEW 2 as select * from dba_objects; Table created. SQL> alter system checkpoint; System altered. SQL> select count(*) from t_xifenfei; COUNT(*) ---------- 86348 SQL> select count(*) from t_xifenfei2; COUNT(*) ---------- 86349 SQL> select count(*) from t_xifenfei3; COUNT(*) ---------- 86350 SQL> select object_id,data_object_id,object_name from dba_objects where object_name like 't_xifenfei%'; OBJECT_ID DATA_OBJECT_ID OBJECT_NAME ---------- -------------- ------------------------------ 88205 88205 t_xifenfei 88206 88206 t_xifenfei2 88207 88207 t_xifenfei3 SQL> truncate table t_xifenfei; Table truncated. SQL> truncate table t_xifenfei2 drop storage; Table truncated. SQL> truncate table t_xifenfei3 reuse storage; Table truncated.
使用dul进行恢复
DUL> bootstrap; DUL> scan database; scanning database... scanning database finished. DUL> unload table sys.t_xifenfei object 88205; Unloading table: t_xifenfei,object ID: 88205 Unloading segment,storage(Obj#=88205 DataObj#=88205 TS#=6 File#=5 Block#=1410 Cluster=0) 86348 rows unloaded DUL> unload table sys.t_xifenfei2 object 88206; Unloading table: t_xifenfei2,object ID: 88206 Unloading segment,storage(Obj#=88206 DataObj#=88206 TS#=6 File#=5 Block#=2690 Cluster=0) 86349 rows unloaded DUL> unload table sys.t_xifenfei3 object 88207; Unloading table: t_xifenfei3,object ID: 88207 Unloading segment,storage(Obj#=88207 DataObj#=88207 TS#=6 File#=5 Block#=3970 Cluster=0) 86350 rows unloaded
这里证明truncate table不管是drop storage还是reuse storage或者默认,在没有被覆盖的情况下,数据均完全恢复出来