大表delete删数据导致数据库异常解决

--查看回滚参数设置，是否是默认并行
sql> show parameter fast_start_parallel_rollback
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
fast_start_parallel_rollback         string      LOW
--LOW 代表 开启CPU*2并行
--设置spfile取消并行
SQL> alter system set fast_start_parallel_rollback=false;
System altered.

SELECT  d.OWNER
       ,d.OBJECT_NAME
       ,d.OBJECT_TYPE
       ,d.status
FROM dba_objects d
WHERE d.status = 'INVALID' 
AND d.owner = '**';

--查询SID, SERIAL#
select s.SQL_TEXT, se.SID, se.SERIAL#
  from v$session se, v$sql s
 where s.sql_id = se.SQL_ID
   and username = '**'
   and status = 'ACTIVE'
   and s.SQL_TEXT like '%delete * from *****%';
--数据库级kill进程
alter system kill session '2953,31083';

--查看等待事件
select inst_id,event,count(*)
  from gv$session a
 where a.status='ACTIVE'
 and not (a.type = 'BACKGROUND' and a.state='WaiTING' and  a.wait_class='Idle')
 group by inst_id,event
 order by a.inst_id,count(*) desc;
---------------------------------------------------
1	wait for a undo record	61
1	resmgr:cpu quantum	29
1	enq: RO - fast object reuse	22
1	enq: CR - block range reuse ckpt	20
1	free buffer waits	17
--查看当前数据回滚情况
alter session set nls_date_fORMat='yyyy-mm-dd hh24:mi:ss';
select usn,
       state,
       undoblockstotal "Total",
       undoblocksdone "Done",
       undoblockstotal - undoblocksdone "ToDo",
       decode(cputime,
              0,
              'unknown',
              sysdate + (((undoblockstotal - undoblocksdone) /
              (undoblocksdone / cputime)) / 86400)) "Estimated time to complete"
  from v$fast_start_transactions
  where state = 'RECOVERING';
---------------------------------------------------
83	RECOVERING	9026713	455	9026258	26-4月 -21

rename table to table_20210410;

create table USER.TABLE
nologging 
parallel 8
tablespace TBS
as select  * 
from USER.TABLE_20210410
where *** like '******%';
--取消并行
alter table USER.TABLE noparallel;
--开启logging
alter table USER.TABLE logging;

alter index USER.INDEX1 rename to INDEX1_20210410;
--重建索引
create index USER.INDEX1 on USER.TABLE (***) tablespace TBS parallel 8;
--取消并行
alter index USER.INDEX1 noparallel;

drop table USER.TABLE_20210410 cascade;