----》rollback使用
sql> create table tbl(name varchar2(10));
table created.
sql> insert into tbl values('zhiqiao');
1 row created.
sql> select * from tbl;
name
----------
zhiqiao
sql> delete tbl;
1 row deleted.
sql> select * from tbl;
no rows selected
sql> rollback;
rollback complete.
----》沒有提交(commit)的資料刪除後無法rollback
sql> select * from tbl;
no rows selected
sql> insert into tbl values('zhiqiao');
1 row created.
sql> select * from tbl;
name
----------
zhiqiao
sql> commit;
commit complete.
sql> delete tbl;
1 row deleted.
sql> select * from tbl;
no rows selected
sql> rollback;
rollback complete.
----》提交(commit)了的資料刪除後可以使用rollback恢復
sql> select * from tbl;
name
----------
zhiqiao
sql> delete tbl;
1 row deleted.
sql> commit;
commit complete.
sql> rollback;
rollback complete.
----》刪除資料後提交(commit)則無法使用rollback恢復
sql> select * from tbl;
no rows selected
oracle 回滾演示 rollback演示
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oracle 回滾演示 rollback演示
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佇列Rollback的設計
有乙個佇列包含了n個block，每個block是佇列中的乙個元素。block很大，乙個block中可以容納m個item m 1 這個佇列的基本使用模式就是 不斷的有item過來，往block裡面填充，一旦block滿，就建立乙個新的block，後繼item都填往新block。rollback的定義 ...