根据metalink脚本学习undo（五）

set lines 120
set pages 999
clear col

set termout off
set trimout on
set trimspool on

connect / as sysdba
alter session set nls_date_format='dd-hh24:mi';

spool undohistoryinfo.out

prompt
prompt  ############## RUNTIME ############## 
prompt

col rdate head "Run Time"

select sysdate rdate from dual;

prompt 
prompt  ############## HISTORICAL DATA ############## 
prompt 

col x format 999,999 head "Max Concurrent|Last 7 Days"
col y format 999,999 head "Max Concurrent|Since Startup"
--最大的并发
select max(maxconcurrency) x from v$undostat
/
--历史最大并发
select max(maxconcurrency) y from sys.wrh$_undostat
/

col i format 999,999 head "1555 Errors"
col j format 999,999 head "Undo Space Errors"
--出现01555的总次数
select sum(ssolderrcnt) i from v$undostat
where end_time > sysdate-2
/
--出现no spaace错误的次数
select sum(nospaceerrcnt) j from v$undostat
where end_time > sysdate-2
/
clear break
clear compute

prompt 
prompt  ############## CURRENT STATUS OF SEGMENTS  ############## 
prompt  ##############   SNAPSHOT IN TIME INFO     ##############
prompt  ##############(SHOWS CURRENT UNDO ACTIVITY)##############
prompt 

col segment_name format a30 head "Segment Name"
col "ACT BYTES" format 999,999,999,999 head "Active Bytes"
col "UNEXP BYTES" format 999,999,999,999 head "Unexpired Bytes"
col "EXP BYTES" format 999,999,999,999 head "Expired Bytes"

select segment_name,  
       sum(case  
             when status = 'ACTIVE' then  
              bytes  
             else  
              0  
           end) "ACT BYTES",  --活动状态的区大小  
       sum(case  
             when status = 'UNEXPIRED' then  
              bytes  
             else  
              0  
           end) "UNEXP BYTES" ,  --未过期区大小  
       sum(case  
             when status = 'EXPIRED' then  
              bytes  
             else  
              0  
           end) "EXP BYTES" --过期区大小  
  from dba_undo_extents  
 group by segment_name  
 order by 1   
  

prompt 
prompt  ############## UNDO SPACE USAGE ############## 
prompt 

col usn format 999,999 head "Segment#"  --回滚段编号  
col shrinks format 999,999,999 head "Shrinks"
col aveshrink format 999,999,999 head "Avg Shrink Size"

  
select usn,         --回滚段编号  
       shrinks,     --回滚段收缩次数  
       aveshrink    --平均每次收缩的大小   
  from v$rollstat  
spool off
set termout on
set trimout off
set trimspool off
clear col

UndoHistoryInfo.sql