All posts by Guang Cai Li - 11. page

1.CurrentActivity.sql

set lines 150
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REM
REM Current transactions
REM
REM Will show only last transaction by a user
REM
REM May need to use 786472.1 for better picture
REM of activity

connect / as sysdba
alter session set nls_date_format=’dd-Mon-yyyy hh24:mi’;

col username format a10 wrapped heading “User”
col name format a22 wrapped heading “Undo Segment Name”
col xidusn heading “Undo|Seg #”
col xidslot heading “Undo|Slot #”
col xidsqn heading “Undo|Seq #”
col ubafil heading “File #”
col ubablk heading “Block #”
col start_time format a10 word_wrapped heading “Started”
col status format a8 heading “Status”
col blk format 999,999,999 heading “KBytes”
col used_urec heading “Rows”

spool undoactivity.out

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

col rdate head “Run Time”

select sysdate rdate from dual;

prompt
prompt ############## Current Uncommitted Transactions ##############
prompt

select start_time, username, r.name,
ubafil, ubablk, t.status, (used_ublk*p.value)/1024 blk, used_urec
from v$transaction t, v$rollname r, v$session s, v$parameter p
where xidusn=usn
and s.saddr=t.ses_addr
and p.name=’db_block_size’
order by 1;
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2.LobData.sql

REM List table and column information for LOBs for a specific user
REM
REM UNDO handling with LOBs is not designed for frequent updates
REM Frequent updates are best handled with PCTVERSION at 100
REM This means you must have a lot of space available in the LOB
REM tablespace as all UNDO will be maintained over time.
REM
REM Using RETENTION does not work as expected
REM It is set to UNDO_RETENTION at the time of the creation of the
REM object. It does not change over time as UNDO_RETENTION
REM or auto-tuned undo retention changes.

set pages 999
set lines 110

spool lobdata.out

col column_name format a25 head “Column”
col table_name format a25 head “Table”
col tablespace_name format a25 head “Tablespace”
col pctversion format 999 head “PCTVersion %”
col segment_space_management format a30 head “Space|Mngmnt”
col retention format 999,999,999 head “Retention”

select l.table_name, l.column_name, l.tablespace_name, l.pctversion, l.retention,
t.segment_space_management
from dba_lobs l, dba_tablespaces t
where owner=upper(‘&USER’)
and l.tablespace_name = t.tablespace_name
/

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3. undoconfig.sql

spool UndoConfig.out

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REM
REM ————————————————————————

REM
REM —————————————————————–
REM

set space 2

REM REPORTING TABLESPACE INFORMATION:
REM
REM This looks at Tablespace Sizing – Total bytes and free bytes
REM

column tablespace_name format a30 heading ‘TS Name’
column sbytes format 9,999,999,999 heading ‘Total MBytes’
column fbytes format 9,999,999,999 heading ‘Free MBytes’
column file_name format a30 heading ‘File Name’
column kount format 999 heading ‘Ext’

compute sum of fbytes on tablespace_name
compute sum of sbytes on tablespace_name
compute sum of sbytes on report
compute sum of fbytes on report

break on tablespace_name skip 2

select a.tablespace_name, a.file_name, round(a.bytes/1024/1024,0) sbytes,
round(sum(b.bytes/1024/1024),0) fbytes, count(*) kount, autoextensible
from dba_data_files a, dba_free_space b
where a.file_id = b.file_id
and a.tablespace_name in (select z.tablespace_name from dba_tablespaces z where retention like ‘%GUARANTEE’)
group by a.tablespace_name, a.file_name, a.bytes, autoextensible
order by a.tablespace_name
/

set linesize 160

REM
REM If you can significantly reduce physical reads by adding incremental
REM data buffers…do it. To determine whether adding data buffers will
REM help, set db_block_lru_statistics = TRUE and
REM db_block_lru_extended_statistics = TRUE in the init.ora parameters.
REM You can determine how many extra hits you would get from memory as
REM opposed to physical I/O from disk. **NOTE: Turning these on will
REM impact performance. One shift of statistics gathering should be enough
REM to get the required information.
REM

REM
REM —————————————————————–
REM

set lines 160

col tablespace_name format a30 heading “Tablespace”
col tb format a15 heading “TB Status”
col df format a10 heading “DF Status”
col extent_management format a15 heading “Extent|Management”
col allocation_type format a8 heading “Type”
col segment_space_management format a7 heading “Auto|Segment”
col retention format a11 heading “Retention|Level”
col autoextensible format a5 heading “Auto?”
col mx format 999,999,999 heading “Max Allowed”

select t.tablespace_name, t.status tb, d.status df,
extent_management, allocation_type, segment_space_management, retention,
autoextensible, (maxbytes/1024/1024) mx
from dba_tablespaces t, dba_data_files d
where t.tablespace_name = d.tablespace_name
and retention like ‘%GUARANTEE’
/

col status format a20 head “Status”
col cnt format 999,999,999 head “How Many?”

select status, count(*) cnt
from dba_rollback_segs
group by status
/

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4.undodatafiles.sql

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connect / as sysdba
alter session set nls_date_format=’dd-Mon-yyyy hh24:mi’;

spool undodatafiles.out

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

col rdate head “Run Time”

select sysdate rdate from dual;

prompt
prompt ############## DATAFILES ##############
prompt

col retention head “Retention”
col tablespace_name format a30 head “TBSP Name”
col file_id format 999 head “File #”
col a format 999,999,999,999,999 head “Bytes Alloc (MB)”
col b format 999,999,999,999,999 head “Max Bytes Used (MB)”
col autoextensible head “Auto|Ext”
col extent_management head “Ext Mngmnt”
col allocation_type head “Type”
col segment_space_management head “SSM”

select tablespace_name, file_id, sum(bytes)/1024/1024 a,
sum(maxbytes)/1024/1024 b,
autoextensible
from dba_data_files
where tablespace_name in (select tablespace_name from dba_tablespaces
where retention like ‘%GUARANTEE’ )
group by file_id, tablespace_name, autoextensible
order by tablespace_name
/

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5.undoextends.sql

spool UndoExts.out

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REM
REM ————————————————————————

REM
REM —————————————————————–
REM

REM
REM REPORTING UNDO EXTENTS INFORMATION:
REM
REM —————————————————————–
REM
REM Undo Extents breakdown information
REM

ttitle center “Rollback Segments Breakdown” skip 2

col status format a20
col cnt format 999,999,999 head “How Many?”

select status, count(*) cnt from dba_rollback_segs
group by status
/

ttitle center “Undo Extents” skip 2

col segment_name format a30 heading “Name”
col “ACT BYTES” format 999,999,999,999 head “Active|Extents”
col “UNEXP BYTES” format 999,999,999,999 head “Unxpired|Extents”
col “EXP BYTES” format 999,999,999,999 head “Expired|Extents”

select segment_name,
nvl(sum(act),0) “ACT BYTES”,
nvl(sum(unexp),0) “UNEXP BYTES”,
nvl(sum(exp),0) “EXP BYTES”
from (
select segment_name,
nvl(sum(bytes),0) act,00 unexp, 00 exp
from DBA_UNDO_EXTENTS
where status=’ACTIVE’ group by segment_name
union
select segment_name,
00 act, nvl(sum(bytes),0) unexp, 00 exp
from DBA_UNDO_EXTENTS
where status=’UNEXPIRED’ group by segment_name
union
select segment_name,
00 act, 00 unexp, nvl(sum(bytes),0) exp
from DBA_UNDO_EXTENTS
where status=’EXPIRED’ group by segment_name
) group by segment_name;

ttitle center “Undo Extents Statistics” skip 2

col size format 999,999,999,999 heading “Size”
col “HOW MANY” format 999,999,999 heading “How Many?”
col st heading a12 heading “Status”

select distinct status st, count(*) “HOW MANY”, sum(bytes) “SIZE”
from dba_undo_extents
group by status
/

col segment_name format a30 heading “Name”
col TABLESPACE_NAME for a20
col BYTES for 999,999,999,999
col BLOCKS for 999,999,999
col status for a15 heading “Status”
col segment_name heading “Segment”
col extent_id heading “ID”

select SEGMENT_NAME, TABLESPACE_NAME, EXTENT_ID,
FILE_ID, BLOCK_ID, BYTES, BLOCKS, STATUS
from dba_undo_extents
order by 1,3,4,5
/

REM
REM —————————————————————–
REM
REM Undo Extents Contention breakdown
REM Take out column TUNED_UNDORETENTION if customer
REM prior to 10.2.x
REM
REM The time frame can be adjusted with this query
REM By default using around 4 hour window of time
REM
REM Ex.
REM Using sysdate-.04 looking at the last hour
REM Using sysdate-.16 looking at the last 4 hours
REM Using sysdate-.32 looking at the last 8 hours
REM Using sysdate-1 looking at the last 24 hours
REM

set linesize 140

ttitle center “Undo Extents Error Conditions (Default – Last 4 Hours)” skip 2

col UNXPSTEALCNT format 999,999,999 heading “# Unexpired|Stolen”
col EXPSTEALCNT format 999,999,999 heading “# Expired|Reused”
col SSOLDERRCNT format 999,999,999 heading “ORA-1555|Error”
col NOSPACEERRCNT format 999,999,999 heading “Out-Of-space|Error”
col MAXQUERYLEN format 999,999,999 heading “Max Query|Length”
col TUNED_UNDORETENTION format 999,999,999 heading “Auto-Ajusted|Undo Retention”
col hours format 999,999 heading “Tuned|(HRs)”

select inst_id, to_char(begin_time,’MM/DD/YYYY HH24:MI’) begin_time,
UNXPSTEALCNT, EXPSTEALCNT , SSOLDERRCNT, NOSPACEERRCNT, MAXQUERYLEN,
TUNED_UNDORETENTION, TUNED_UNDORETENTION/60/60 hours
from gv$undostat
where begin_time between (sysdate-.16)
and sysdate
order by inst_id, begin_time
/

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6.undoheathcheck.sql

spool Undohealth.out

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REM
REM ————————————————————————

col name format a30
col gets format 9,999,999
col waits format 9,999,999

PROMPT ROLLBACK HIT STATISTICS:
REM

REM GETS – # of gets on the rollback segment header
REM WAITS – # of waits for the rollback segment header

set head on;

select name, waits, gets
from v$rollstat, v$rollname
where v$rollstat.usn = v$rollname.usn
/

col pct head “< 2% ideal” select ‘The average of waits/gets is ‘|| round((sum(waits) / sum(gets)) * 100,2)||’%’ PCT From v$rollstat / PROMPT REDO CONTENTION STATISTICS: REM REM If the ratio of waits to gets is more than 1% or 2%, consider REM creating more rollback segments REM REM Another way to gauge rollback contention is: REM column xn1 format 9999999 column xv1 new_value xxv1 noprint select class, count from v$waitstat where class in (‘system undo header’, ‘system undo block’, ‘undo header’, ‘undo block’ ) / set head off select ‘Total requests = ‘||sum(count) xn1, sum(count) xv1 from v$waitstat / select ‘Contention for system undo header = ‘|| (round(count/(&xxv1+0.00000000001),4)) * 100||’%’ from v$waitstat where class = ‘system undo header’ / select ‘Contention for system undo block = ‘|| (round(count/(&xxv1+0.00000000001),4)) * 100||’%’ from v$waitstat where class = ‘system undo block’ / select ‘Contention for undo header = ‘|| (round(count/(&xxv1+0.00000000001),4)) * 100||’%’ from v$waitstat where class = ‘undo header’ / select ‘Contention for undo block = ‘|| (round(count/(&xxv1+0.00000000001),4)) * 100||’%’ from v$waitstat where class = ‘undo block’ / REM REM NOTE: Not as useful with AUM configured REM REM If the percentage for an area is more than 1% or 2%, consider REM creating more rollback segments. Note: This value is usually very REM small REM and has been rounded to 4 places. REM REM ———————————————————————— REM REM The following shows how often user processes had to wait for space in REM the redo log buffer: select name||’ = ‘||value from v$sysstat where name = ‘redo log space requests’ / REM REM This value should be near 0. If this value increments consistently, REM processes have had to wait for space in the redo buffer. If this REM condition exists over time, increase the size of LOG_BUFFER in the REM init.ora file in increments of 5% until the value nears 0. REM ** NOTE: increasing the LOG_BUFFER value will increase total SGA size. REM REM ———————————————————————– col name format a15 col gets format 9999999 col misses format 9999999 col immediate_gets heading ‘IMMED GETS’ format 9999999 col immediate_misses heading ‘IMMED MISS’ format 9999999 col sleeps format 999999 PROMPT LATCH CONTENTION: REM REM GETS – # of successful willing-to-wait requests for a latch REM MISSES – # of times an initial willing-to-wait request was unsuccessful REM IMMEDIATE_GETS – # of successful immediate requests for each latch REM IMMEDIATE_MISSES = # of unsuccessful immediate requests for each latch REM SLEEPS – # of times a process waited and requests a latch after an REM initial willing-to-wait request REM REM If the latch requested with a willing-to-wait request is not REM available, the requesting process waits a short time and requests REM again. REM If the latch requested with an immediate request is not available, REM the requesting process does not wait, but continues processing REM set head on select name, gets, misses, immediate_gets, immediate_misses, sleeps from v$latch where name in (‘redo allocation’, ‘redo copy’) / set head off select ‘Ratio of MISSES to GETS: ‘|| round((sum(misses)/(sum(gets)+0.00000000001) * 100),2)||’%’ from v$latch where name in (‘redo allocation’, ‘redo copy’) / select ‘Ratio of IMMEDIATE_MISSES to IMMEDIATE_GETS: ‘|| round((sum(immediate_misses)/ (sum(immediate_misses+immediate_gets)+0.00000000001) * 100),2)||’%’ from v$latch where name in (‘redo allocation’, ‘redo copy’) / set head on REM REM If either ratio exceeds 1%, performance will be affected. REM REM Decreasing the size of LOG_SMALL_ENTRY_MAX_SIZE reduces the number of REM processes copying information on the redo allocation latch. REM REM Increasing the size of LOG_SIMULTANEOUS_COPIES will reduce contention REM for redo copy latches. REM REM —————————————————————– REM This looks at overall i/o activity against individual REM files within a tablespace REM REM Look for a mismatch across disk drives in terms of I/O REM REM Also, examine the Blocks per Read Ratio for heavily accessed REM TSs – if this value is significantly above 1 then you may have REM full tablescans occurring (with multi-block I/O) REM REM If activity on the files is unbalanced, move files around to balance REM the load. Should see an approximately even set of numbers across files REM set space 1 PROMPT REPORTING I/O STATISTICS: column pbr format 99999999 heading ‘Physical|Blk Read’ column pbw format 999999 heading ‘Physical|Blks Wrtn’ column pyr format 999999 heading ‘Physical|Reads’ column readtim format 99999999 heading ‘Read|Time’ column name format a55 heading ‘DataFile Name’ column writetim format 99999999 heading ‘Write|Time’ compute sum of f.phyblkrd, f.phyblkwrt on report select fs.name name, f.phyblkrd pbr, f.phyblkwrt pbw, f.readtim, f.writetim from v$filestat f, v$datafile fs where f.file# = fs.file# order by fs.name / REM REM —————————————————————– PROMPT GENERATING WAIT STATISTICS: REM REM This will show wait stats for certain kernel instances. This REM may show the need for additional rbs, wait lists, db_buffers REM column class heading ‘Class Type’ column count heading ‘Times Waited’ format 99,999,999 column time heading ‘Total Times’ format 99,999,999 select class, count, time from v$waitstat where count > 0
order by class
/

REM
REM Look at the wait statistics generated above (if any). They will
REM tell you where there is contention in the system. There will
REM usually be some contention in any system – but if the ratio of
REM waits for a particular operation starts to rise, you may need to
REM add additional resource, such as more database buffers, log buffers,
REM or rollback segments
REM
REM —————————————————————–

PROMPT ROLLBACK EXTENT STATISTICS:
REM

column usn format 999 heading ‘Undo #’
column extents format 999 heading ‘Extents’
column rssize format 999,999,999 heading ‘Size in|Bytes’
column optsize format 999,999,999 heading ‘Optimal|Size’
column hwmsize format 99,999,999 heading ‘High Water|Mark’
column shrinks format 9,999 heading ‘Num of|Shrinks’
column wraps format 9,999 heading ‘Num of|Wraps’
column extends format 999,999 heading ‘Num of|Extends’
column aveactive format 999,999,999 heading ‘Average size|Active Extents’
column rownum noprint

select usn, extents, rssize, optsize, hwmsize,
shrinks, wraps, extends, aveactive
from v$rollstat
order by rownum
/

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7.undohistoryinfo.sql

set lines 120
set pages 999
clear col

set termout off
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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”

select max(maxconcurrency) x from v$undostat
/
select max(maxconcurrency) y from sys.wrh$_undostat
/

col i format 999,999 head “1555 Errors”
col j format 999,999 head “Undo Space Errors”

select sum(ssolderrcnt) i from v$undostat
where end_time > sysdate-2
/

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, nvl(sum(act),0) “ACT BYTES”,
nvl(sum(unexp),0) “UNEXP BYTES”,
nvl(sum(exp),0) “EXP BYTES”
from (select segment_name, nvl(sum(bytes),0) act,00 unexp, 00 exp
from dba_undo_extents where status=’ACTIVE’ group by segment_name
union
select segment_name, 00 act, nvl(sum(bytes),0) unexp, 00 exp
from dba_undo_extents where status=’UNEXPIRED’ group by segment_name
union
select segment_name, 00 act, 00 unexp, nvl(sum(bytes),0) exp
from dba_undo_extents where status=’EXPIRED’ group by segment_name)
group by segment_name
order by 1
/

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

col usn format 999,999 head “Segment#”
col shrinks format 999,999,999 head “Shrinks”
col aveshrink format 999,999,999 head “Avg Shrink Size”

select usn, shrinks, aveshrink from v$rollstat
/
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8.undoparameters.sql

set lines 120
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connect / as sysdba
alter session set nls_date_format=’dd-Mon-yyyy hh24:mi’;

spool undoparameters.out

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

col rdate head “Run Time”

select sysdate rdate from dual;

col inst_id format 999 head “Instance #”
col Parameter format a35 wrap
col “Session Value” format a25 wrapped
col “Instance Value” format a25 wrapped

prompt
prompt ############## PARAMETERS ##############
prompt

select a.inst_id, a.ksppinm “Parameter”,
b.ksppstvl “Session Value”,
c.ksppstvl “Instance Value”
from x$ksppi a, x$ksppcv b, x$ksppsv c
where a.indx = b.indx and a.indx = c.indx
and a.inst_id=b.inst_id and b.inst_id=c.inst_id
and a.ksppinm in (‘_undo_autotune’, ‘_smu_debug_mode’,
‘_highthreshold_undoretention’,
‘undo_tablespace’,’undo_retention’,’undo_management’)
order by 2;

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9. undopressure.sql

set lines 120
set pages 999
clear col

set termout off
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set trimspool on

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

spool undopressure.out

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

col rdate head “Run Time”

select sysdate rdate from dual;

prompt
prompt ############## WAITS FOR UNDO (Since Startup) ##############
prompt

col inst_id head “Instance#”
col eq_type format a3 head “Enq”
col total_req# format 999,999,999,999,999,999 head “Total Requests”
col total_wait# format 999,999 head “Total Waits”
col succ_req# format 999,999,999,999,999,999 head “Successes”
col failed_req# format 999,999,999999 head “Failures”
col cum_wait_time format 999,999,999 head “Cummalitve|Time”

select * from v$enqueue_stat where eq_type=’US’
union
select * from v$enqueue_stat where eq_type=’HW’
/

prompt
prompt ############## LOCKS FOR UNDO ##############
prompt

col addr head “ADDR”
col KADDR head “KADDR”
col sid head “Session”
col osuser format a10 head “OS User”
col machine format a15 head “Machine”
col program format a17 head “Program”
col process format a7 head “Process”
col lmode head “Lmode”
col request head “Request”
col ctime format 9,999 head “Time|(Mins)”
col block head “Blocking?”

select /*+ RULE */ a.SID, b.process,
b.OSUSER, b.MACHINE, b.PROGRAM,
addr, kaddr, lmode, request, round(ctime/60/60,0) ctime, block
from
v$lock a,
v$session b
where
a.sid=b.sid
and a.type=’US’
/

prompt
prompt ############## TUNED RETENTION HISTORY (Last 2 Days) ##############
prompt ############## LOWEST AND HIGHEST DATA ##############
prompt

col low format 999,999,999,999 head “Undo Retention|Lowest Tuned Value”
col high format 999,999,999,999 head “Undo Retention|Highest Tuned Value”

select end_time, tuned_undoretention from v$undostat where tuned_undoretention = (
select min(tuned_undoretention) low
from v$undostat
where end_time > sysdate-2)
/

select end_time, tuned_undoretention from v$undostat where tuned_undoretention = (
select max(tuned_undoretention) high
from v$undostat
where end_time > sysdate-2)
/

prompt
prompt ############## CURRENT TRANSACTIONS ##############
prompt

col sql_text format a40 word_wrapped head “SQL Code”

select a.start_date, a.start_scn, a.status, c.sql_text
from v$transaction a, v$session b, v$sqlarea c
where b.saddr=a.ses_addr and c.address=b.sql_address
and b.sql_hash_value=c.hash_value
/

select current_scn from v$database
/

col a format 999,999 head “UnexStolen”
col b format 999,999 head “ExStolen”
col c format 999,999 head “UnexReuse”
col d format 999,999 head “ExReuse”

prompt
prompt ############## WHO’S STEALING WHAT? (Last 2 Days) ##############
prompt

select unxpstealcnt a, expstealcnt b,
unxpblkreucnt c, expblkreucnt d
from v$undostat
where (unxpstealcnt > 0 or expstealcnt > 0)
and end_time > sysdate-2
/

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clear col

10. undostatistics.sql

set lines 120
set pages 999
clear col

set termout off
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set trimspool on

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

spool undostatistics.out

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

col rdate head “Run Time”

select sysdate rdate from dual;

col current_scn head “SCN Now”
col start_date head “Trans Started”
col start_scn head “SCN for Trans”
col ses_addr head “ADDR”

prompt
prompt ############## Historical V$UNDOSTAT (Last 2 Days) ##############
prompt

col end_time format a18 Head “Date/Time”
col maxq format 999,999 head “Query|Maximum|Minutes”
col maxquerysqlid head “SqlID”
col undotsn format 999,999 head “TBS”
col undoblks format 999,999,999 head “Undo|Blocks”
col txncount format 999,999,999 head “# of|Trans”
col unexpiredblks format 999,999,999 head “# of Unexpired”
col expiredblks format 999,999,999 head “# of Expired”
col tuned format 999,999 head “Tuned Retention|(Minutes)”

select end_time, round(maxquerylen/60,0) maxq, maxquerysqlid,
undotsn, undoblks, txncount, unexpiredblks, expiredblks,
round(tuned_undoretention/60,0) Tuned
from dba_hist_undostat
where end_time > sysdate-2
order by 1
/

prompt
prompt ############## RECENT MISSES FOR UNDO (Last 2 Days) ##############
prompt

clear col
set lines 500
select * from v$undostat where maxquerylen > tuned_undoretention
and end_time > sysdate-2
order by 2
/

select * from sys.wrh$_undostat where maxquerylen > tuned_undoretention
and end_time > sysdate-2
order by 2
/

prompt
prompt ############## AUTO-TUNING TUNE-DOWN DATA ##############
prompt ############## ROLLBACK DATA (Since Startup) ##############
prompt

col name format a60 head “Name”
col value format 999,999,999 head “Counters”

select name, value from v$sysstat
where name like ‘%down retention%’ or name like ‘une down%’
or name like ‘%undo segment%’ or name like ‘%rollback%’
or name like ‘%undo record%’
/

prompt
prompt ############## Long Running Query History ##############
prompt

col end_time head “Date”
col maxquerysqlid head “SQL ID”
col runawayquerysqlid format a15 head “Runaway SQL ID”
col results format a35 word_wrapped head “Space Issues”
col status head “Status”
col newret head “Tuned Down|Retention”

select end_time, maxquerysqlid, runawayquerysqlid, status,
decode(status,1,’Slot Active’,4,’Reached Best Retention’,5,’Reached Best Retention’,
8, ‘Runaway Query’,9,’Runaway Query-Active’,10,’Space Pressure’,
11,’Space Pressure Currently’,
16, ‘Tuned Down (to undo_retention) due to Space Pressure’,
17,’Tuned Down (to undo_retention) due to Space Pressure-Active’,
18, ‘Tuning Down due to Runaway’, 19, ‘Tuning Down due to Runaway-Active’,
28, ‘Runaway tuned down to last tune down value’,
29, ‘Runaway tuned down to last tune down value’,
32, ‘Max Tuned Down – Not Auto-Tuning’,
33, ‘Max Tuned Down – Not Auto-Tuning (Active)’,
37, ‘Max Tuned Down – Not Auto-Tuning (Active)’,
38, ‘Max Tuned Down – Not Auto-Tuning’,
39, ‘Max Tuned Down – Not Auto-Tuning (Active)’,
40, ‘Max Tuned Down – Not Auto-Tuning’,
41, ‘Max Tuned Down – Not Auto-Tuning (Active)’,
42, ‘Max Tuned Down – Not Auto-Tuning’,
44, ‘Max Tuned Down – Not Auto-Tuning’,
45, ‘Max Tuned Down – Not Auto-Tuning (Active)’,
‘Other (‘||status||’)’) Results, spcprs_retention NewRet
from sys.wrh$_undostat
where status > 1
/

prompt
prompt ############## Details on Long Run Queries ##############
prompt

col sql_fulltext head “SQL Text”
Col sql_id heading “SQL ID”

select sql_id, sql_fulltext, last_load_time “Last Load”,
round(elapsed_time/1000000/60/60/24,0) “Elapsed Days”
from v$sql where sql_id in
(select maxquerysqlid from sys.wrh$_undostat
where status > 1)
/

spool off
set termout on
set trimout off
set trimspool off
clear col

 

11.

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-Mon-yyyy hh24:mi’;

spool undousage.out

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

col rdate head “Run Time”

select sysdate rdate from dual;

prompt
prompt ############## IN USE Undo Data ##############
prompt

select
((select (nvl(sum(bytes),0))
from dba_undo_extents
where tablespace_name in (select tablespace_name from dba_tablespaces
where retention like ‘%GUARANTEE’ )
and status in (‘ACTIVE’,’UNEXPIRED’)) *100) /
(select sum(bytes)
from dba_data_files
where tablespace_name in (select tablespace_name from dba_tablespaces
where retention like ‘%GUARANTEE’ )) “PCT_INUSE”
from dual;

select tablespace_name, extent_management, allocation_type,
segment_space_management, retention
from dba_tablespaces where retention like ‘%GUARANTEE’
/

col c format 999,999,999,999 head “Sum of Free”

select (nvl(sum(bytes),0)) c from dba_free_space
where tablespace_name in
(select tablespace_name from dba_tablespaces where retention like ‘%GUARANTEE’)
/

col d format 999,999,999,999 head “Total Bytes”

select sum(bytes) d from dba_data_files
where tablespace_name in
(select tablespace_name from dba_tablespaces where retention like ‘%GUARANTEE’)
/

PROMPT
PROMPT ############## UNDO SEGMENTS ##############
PROMPT

col status head “Status”
col z format 999,999 head “Total Extents”
break on report
compute sum on report of z

select status, count(*) z from dba_undo_extents
group by status
/

col z format 999,999 head “Undo Segments”

select status, count(*) z from dba_rollback_segs
group by status
/

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, nvl(sum(act),0) “ACT BYTES”,
nvl(sum(unexp),0) “UNEXP BYTES”,
nvl(sum(exp),0) “EXP BYTES”
from (select segment_name, nvl(sum(bytes),0) act,00 unexp, 00 exp
from dba_undo_extents where status=’ACTIVE’ group by segment_name
union
select segment_name, 00 act, nvl(sum(bytes),0) unexp, 00 exp
from dba_undo_extents where status=’UNEXPIRED’ group by segment_name
union
select segment_name, 00 act, 00 unexp, nvl(sum(bytes),0) exp
from dba_undo_extents where status=’EXPIRED’ group by segment_name)
group by segment_name
order by 1
/

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

col usn format 999,999 head “Segment#”
col shrinks format 999,999,999 head “Shrinks”
col aveshrink format 999,999,999 head “Avg Shrink Size”

select usn, shrinks, aveshrink from v$rollstat
/
spool off
set termout on
set trimout off
set trimspool off
clear col