Plot Oracle historical statistics within SQL*Plus

More than often I’m asked to investigate “what happened yesterday when performance problems appeared”.

Sometimes I have the Enterprise Manager DB Console licensed, sometimes not. Sometimes I have direct SQL*Net access to the database that I may use to produce custom reports with my LAMP self-developed application. But it may happen that only an ssh access is granted to the db server.

That’s why I started to develop some little scripts to plot the trends of database timed statistics.

Let’s see this one:
SQL> @sysstat.sql Enter a sysstat to search for: physical reads
STAT_ID STAT_NAME ----------- ------------------------------------------
2263124246physical reads 4171507801 physical reads cache 297908839 physical reads cache prefetch 2589616721 physical reads direct 2564935310 physical reads direct (lob) 2663793346 physical reads direct temporary tablespace 473165409 physical reads for flashback new 3102888545 physical reads prefetch warmup 531193461 physical reads retry corrupt

9 rows selected.

Enter the desired stat_id: 2263124246
Enter the start date (YYYYMMDD) [defaults today] : 20080922
Enter the end date date (YYYYMMDD) [defaults today] : 20080922
STAT_NAME START END ---------------- -------- -------- physical reads 20080922 20080922

BEGIN_INTERVAL_TIME VALORE PLOTTED_VALUE ------------------------- ---------- ------------------------- 22-SEP-08 12.00.12.122 AM 0 22-SEP-08 01.00.28.253 AM 120092 22-SEP-08 02.00.05.039 AM 35780 22-SEP-08 03.00.55.595 AM 4792 22-SEP-08 04.00.43.725 AM 4905 22-SEP-08 05.00.31.855 AM 7300 22-SEP-08 06.00.17.017 AM 234596 22-SEP-08 07.00.08.132 AM 24651 22-SEP-08 08.00.50.936 AM 481884 22-SEP-08 09.00.33.488 AM 130201 22-SEP-08 10.00.03.805 AM 1300306 ** 22-SEP-08 11.00.07.764 AM 491857 22-SEP-08 12.00.31.548 PM 304702 22-SEP-08 01.01.04.880 PM 1023664 * 22-SEP-08 02.00.17.822 PM 8588180 ************ 22-SEP-08 03.00.36.969 PM 2201615 *** 22-SEP-08 04.01.01.397 PM 17237098 ************************* 22-SEP-08 05.00.39.262 PM 1606300 ** 22-SEP-08 06.00.03.829 PM 451568 22-SEP-08 07.00.31.461 PM 137684 22-SEP-08 08.00.05.966 PM 203803 22-SEP-08 09.00.24.829 PM 536394 22-SEP-08 10.00.12.945 PM 10209783 ************** 22-SEP-08 11.00.35.123 PM 6151663 *********

24 rows selected.

Oh! At 4.00 PM we had a lot of physical reads. Nice.

This is the code:

-- display given statistics from DBA_HIST_SYSSTAT
col BEGIN_INTERVAL_TIME for a25
set pages 100 lines 130
set verify off term on

accept sysstat prompt 'Enter a sysstat to search for: '
select STAT_ID, STAT_NAME
  from DBA_HIST_STAT_NAME
   where lower(STAT_NAME) like lower('%&sysstat%')
  order by stat_name;

accept stat_id prompt 'Enter the desired stat_id: '
accept startdate prompt 'Start date (YYYYMMDD) [today] : '
accept enddate prompt 'End date date (YYYYMMDD) [today] : '

select STAT_NAME,
  nvl('&startdate',to_char(sysdate,'YYYYMMDD')) as "START",
  nvl('&enddate',to_char(sysdate,'YYYYMMDD')) as "END"
 from DBA_HIST_STAT_NAME
where STAT_ID = &stat_id;

select BEGIN_INTERVAL_TIME, VALORE,
  substr( rpad('*',40*round( VALORE/max(VALORE)over(),2),'*'),1,40) PLOTTED_VALORE
  from (
  select s.BEGIN_INTERVAL_TIME BEGIN_INTERVAL_TIME,
    nvl(decode(greatest(VALUE, nvl(lag(VALUE) over
      (partition by s.dbid, s.instance_number, g.stat_name order by s.snap_id),0)),
    VALUE,
    VALUE - lag(VALUE) over
      (partition by s.dbid, s.instance_number, g.stat_name order by s.snap_id),VALUE), 0) VALORE
  from DBA_HIST_SNAPSHOT s,
          DBA_HIST_SYSSTAT g,
          v$instance i
  where s.SNAP_ID=g.SNAP_ID
  and g.STAT_ID='&stat_id'
  and s.BEGIN_INTERVAL_TIME >=
    trunc(to_timestamp(nvl('&startdate',to_char(sysdate,'YYYYMMDD')),'YYYYMMDD'))
  and s.BEGIN_INTERVAL_TIME < =
   trunc(to_timestamp(nvl('&enddate',to_char(sysdate,'YYYYMMDD')),'YYYYMMDD')+1)
  and s.instance_number=i.instance_number
  and s.instance_number=g.instance_number
  order by 1
);

-- display given statistics from DBA_HIST_SYSSTAT

col BEGIN_INTERVAL_TIME for a25

set pages 100 lines 130

set verify off term on

accept sysstat prompt 'Enter a sysstat to search for: '

select STAT_ID, STAT_NAME

from DBA_HIST_STAT_NAME

where lower(STAT_NAME) like lower('%&sysstat%')

order by stat_name;

accept stat_id prompt 'Enter the desired stat_id: '

accept startdate prompt 'Start date (YYYYMMDD) [today] : '

accept enddate prompt 'End date date (YYYYMMDD) [today] : '

select STAT_NAME,

nvl('&startdate',to_char(sysdate,'YYYYMMDD')) as "START",

nvl('&enddate',to_char(sysdate,'YYYYMMDD')) as "END"

from DBA_HIST_STAT_NAME

where STAT_ID = &stat_id;

select BEGIN_INTERVAL_TIME, VALORE,

substr( rpad('*',40*round( VALORE/max(VALORE)over(),2),'*'),1,40) PLOTTED_VALORE

from (

select s.BEGIN_INTERVAL_TIME BEGIN_INTERVAL_TIME,

nvl(decode(greatest(VALUE, nvl(lag(VALUE) over

(partition by s.dbid, s.instance_number, g.stat_name order by s.snap_id),0)),

VALUE,

VALUE - lag(VALUE) over

(partition by s.dbid, s.instance_number, g.stat_name order by s.snap_id),VALUE), 0) VALORE

from DBA_HIST_SNAPSHOT s,

DBA_HIST_SYSSTAT g,

v$instance i

where s.SNAP_ID=g.SNAP_ID

and g.STAT_ID='&stat_id'

and s.BEGIN_INTERVAL_TIME >=

trunc(to_timestamp(nvl('&startdate',to_char(sysdate,'YYYYMMDD')),'YYYYMMDD'))

and s.BEGIN_INTERVAL_TIME < =

trunc(to_timestamp(nvl('&enddate',to_char(sysdate,'YYYYMMDD')),'YYYYMMDD')+1)

and s.instance_number=i.instance_number

and s.instance_number=g.instance_number

order by 1

);

Ciao
—
Ludovico

Bio
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Ludovico

Principal Product Manager at Oracle

Ludovico is a member of the Oracle Database High Availability (HA), Scalability & Maximum Availability Architecture (MAA) Product Management team in Oracle. He focuses on Oracle Data Guard, Flashback technologies, and Cloud MAA.

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11 thoughts on “Plot Oracle historical statistics within SQL*Plus”

kumar on July 31, 2023 at 8:11 pm said:

Thanks. Its great

What if we want to just to a daily sum and not per snap reading.

SO I just want to see per day and not per snap ID.

Reply ↓
- Ludovico on August 15, 2023 at 2:09 pm said:
  
  Well, in that case you’ll need some aggregation per day…
  Like profs use to say: “the solution of this problem is trivial and is left as an exercise for the reader” 🙂
  
  Reply ↓
satish on May 2, 2019 at 7:45 am said:

Thank you for sharing..very useful post

Reply ↓
satish on April 30, 2019 at 3:43 pm said:

Hi Ludovico,

Is the output shows cumulative values or delta values?

Thank you

Reply ↓
- Ludovico on April 30, 2019 at 4:02 pm said:
  
  Hi Satish, the delta is shown. This is thanks to the “lag .. over ” function.
  
  Reply ↓
yousuf on January 8, 2017 at 9:18 am said:

Ludovico,

Nice work!!!.

Please request to validate below SQL can be used for RAC aware script!!

select instance_number,SNAP_ID, BEGIN_INTERVAL_TIME, VALORE,
substr( rpad(‘*’,40*round( VALORE/max(VALORE)over(),2),’*’),1,40) PLOTTED_VALORE
from (
select s.instance_number instance_number,s.SNAP_ID,s.BEGIN_INTERVAL_TIME BEGIN_INTERVAL_TIME,
nvl(decode(greatest(VALUE, nvl(lag(VALUE) over
(partition by s.dbid, s.instance_number, g.stat_name order by s.snap_id),0)),
VALUE,
VALUE – lag(VALUE) over
(partition by s.dbid, s.instance_number, g.stat_name order by s.snap_id),VALUE), 0) VALORE
from DBA_HIST_SNAPSHOT s,
DBA_HIST_SYSSTAT g,
gv$instance i
where s.SNAP_ID=g.SNAP_ID
and g.STAT_ID=’&stat_id’
and s.BEGIN_INTERVAL_TIME >=
trunc(to_timestamp(nvl(‘&startdate’,to_char(sysdate,’YYYYMMDD’)),’YYYYMMDD’))
and s.BEGIN_INTERVAL_TIME < =
trunc(to_timestamp(nvl('&enddate',to_char(sysdate,'YYYYMMDD')),'YYYYMMDD')+1)
and s.instance_number=i.instance_number
and s.instance_number=g.instance_number
order by 1
);

Thanks
Yousuf

Reply ↓
- Ludovico on January 25, 2017 at 11:51 am said:
  
  Hi Yousuf, it should be RAC aware, it will just gives you onw series per instance.
  
  Reply ↓
Pingback: Querying DBA_HIST_SNAPSHOT and DBA_HIST_SYSSTAT « flashdba
Ludovico on March 8, 2011 at 6:58 pm said:

eMPi, you’re right, I fixed the post.

Reply ↓
eMPi on March 8, 2011 at 6:11 pm said:

Line
substr( rpad(‘*’,40*round( VALUE/max(VALORE)over(),2),’*’),1,40) PLOTTED_VALORE

should be:
substr( rpad(‘*’,40*round( VALORE/max(VALORE)over(),2),’*’),1,40) PLOTTED_VALORE

Otherwise – very good post! Thanks

Reply ↓
Zelda on November 10, 2008 at 5:47 am said:

Keep up the good work.

Reply ↓

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Plot Oracle historical statistics within SQL*Plus

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11 thoughts on “Plot Oracle historical statistics within SQL*Plus”

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