Saturday, August 31, 2013

Useful blog

Oraclemamkutti.blogspot.in
http://rajeshwaranbtech.blogspot.in/2010/04/cursorsharing-similar-force-exact.html
http://oracleinaction.com/buffer-cache-wait-events/
http://oracle-randolf.blogspot.in/
http://madhusappsdba.blogspot.in
http://www.dbspecialists.com/files/presentations/

Manual Upgrade of 11g (11.2.0.3 to 12c)

Complete Checklist for Manual Upgrades to Oracle Database 12c Release 1 (12.1) (Doc ID 1503653.1) 

Oracle Golden Gate GGSCI commands

GGSCI commands executed at the ggsci line utility, are used to setup, manage, monitor and troubleshoot the different components of the Goldengate Replication configuration. You are able to look at the current status, lag, database versions, previous commands run, add/delete processes, etc.

Some of the more interesting Goldengate commands are below.

GGSCICommand -> history
GGSCI (proddb01) 44> history
 
GGSCI Command History
 
   35: info PMP02 detail
   36: info all
   37: info PMP02 detail
   38: info all
   39: info all
   40: history
   41: view report EXT02
   42: history
   43: view report EXT02 detail
   44: history
 
 
GGSCI (proddb01) 45> info all
 
Program     Status      Group       Lag at Chkpt  Time Since Chkpt
 
MANAGER     RUNNING                                          
EXTRACT     RUNNING     PMP02       00:00:00      00:00:01   
EXTRACT     RUNNING     EXT02       00:00:00      00:00:01   
REPLICAT    RUNNING     RHA02       00:00:00      00:00:03
GGSCICommand -> !
To rerun the previous command use “!”
GGSCI (proddb01) 46> !
info all
 
Program     Status      Group       Lag at Chkpt  Time Since Chkpt
 
MANAGER     RUNNING                                          
EXTRACT     RUNNING     PMP02       00:00:00      00:00:06   
EXTRACT     RUNNING     EXT02       00:00:00      00:00:06   
REPLICAT    RUNNING     RHA02       00:00:00      00:00:08
To run a specific command from the history use “!” with the command line number.
GGSCI (proddb01) 47> !42
history
 
GGSCI Command History
 
   38: info all
   39: info all
   40: history
   41: view report EXT02
   42: history
   43: view report EXT02 detail
   44: history
   45: info all
   46: info all
   47: history
GGSCICommand -> versions
VERSION: You can view this to view the version of the OS, host info and the database version.
GGSCI (proddb02) 3> versions
Operating System:
SunOS
Version Generic_147440-01, Release 5.10
Node: proddb02
Machine: sun4u
 
Database:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE    11.2.0.3.0      Production
TNS for Solaris: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production
GGSCICommand -> view report
REPORTS: View the reports for specific processes.
GGSCI (proddb01) 49> view report EXT02
 
Opened new report file at 2013-03-12 00:01:00.
 
***********************************************************************
**                     Run Time Messages                             **
***********************************************************************
 
2013-03-12 02:43:12  INFO    OGG-01738  BOUNDED RECOVERY: CHECKPOINT: for object pool 1: p21775_extr: start=SeqNo: 17632, RBA: 21008, SCN: 0.1148
5118 (11485118), Timestamp: 2013-03-12 02:41:35.000000, Thread: 1, end=SeqNo: 17632, RBA: 21504, SCN: 0.11485118 (11485118), Timestamp: 2013-03-1
2 02:41:35.000000, Thread: 1.
 
2013-03-12 06:43:20  INFO    OGG-01738  BOUNDED RECOVERY: CHECKPOINT: for object pool 1: p21775_extr: start=SeqNo: 17646, RBA: 18448, SCN: 0.1149
0824 (11490824), Timestamp: 2013-03-12 06:42:08.000000, Thread: 1, end=SeqNo: 17646, RBA: 18944, SCN: 0.11490824 (11490824), Timestamp: 2013-03-1
2 06:42:08.000000, Thread: 1.
GGSCICommand -> show all
Use the “show” command to look at the configuration info on the different processes.
GGSCI (proddb01) 50> show
 
Parameter settings:
 
SET SUBDIRS    ON
SET DEBUG      OFF
 
Current directory: /u01/app/ha/ggs
 
Using subdirectories for all process files
 
Editor:  vi
 
Reports (.rpt)                 /u01/app/db01/ggs/dirrpt
Parameters (.prm)              /u01/app/db01/ggs/dirprm
Stdout (.out)                  /u01/app/db01/ggs/dirout
Replicat Checkpoints (.cpr)    /u01/app/db01/ggs/dirchk
Extract Checkpoints (.cpe)     /u01/app/db01/ggs/dirchk
Process Status (.pcs)          /u01/app/db01/ggs/dirpcs
SQL Scripts (.sql)             /u01/app/db01/ggs/dirsql
Database Definitions (.def)    /u01/app/db01/ggs/dirdef
 
GGSCI (proddb01) 52> show all
 
Parameter settings:
 
SET SUBDIRS    ON
SET DEBUG      OFF
 
Current directory: /u01/app/ha/ggs
 
Using subdirectories for all process files
 
Editor:  vi
 
Reports (.rpt)                 /u01/app/db01/ggs/dirrpt
Parameters (.prm)              /u01/app/db01/ggs/dirprm
Stdout (.out)                  /u01/app/db01/ggs/dirout
Replicat Checkpoints (.cpr)    /u01/app/db01/ggs/dirchk
Extract Checkpoints (.cpe)     /u01/app/db01/ggs/dirchk
Process Status (.pcs)          /u01/app/db01/ggs/dirpcs
SQL Scripts (.sql)             /u01/app/db01/ggs/dirsql
Database Definitions (.def)    /u01/app/db01/ggs/dirdef

Friday, August 30, 2013

Archivelog Generation

Who is generating redo logs now?

One of the first question, which cover firefighter is: "Who is generating redo logs in this moment". Idea is to determine action on ad hoc basis. For that I use following script, which I call top_redo.sql:
/* -----------------------------------------------------------------------------
 Filename: top_redo.sql
  
 CR/TR#  :
 
 Purpose : Shows current redo logs generation info (RAC-non RAC environment)
            
 Date    : 12.08.2008.
 Author  : Damir Vadas, damir.vadas@gmail.com
  
 Remarks : run as privileged user
 
 Changes (DD.MM.YYYY, Name, CR/TR#):
--------------------------------------------------------------------------- */
col machine for a15
col username for a10
col redo_MB for 999G990 heading "Redo |Size MB"
column sid_serial for a13;
 
select b.inst_id,
       lpad((b.SID || ',' || lpad(b.serial#,5)),11) sid_serial,
       b.username,
       machine,
       b.osuser,
       b.status,
       a.redo_mb 
from (select n.inst_id, sid,
             round(value/1024/1024) redo_mb
        from gv$statname n, gv$sesstat s
        where n.inst_id=s.inst_id
              and n.name = 'redo size'
              and s.statistic# = n.statistic#
        order by value desc
     ) a,
     gv$session b
where b.inst_id=a.inst_id
  and a.sid = b.sid
and   rownum <= 30
;
 
PROMPT Top 30 from gv$sesstat view according generated redo logs
Result is something like:
SQL> @top_redo
                                                                                               Redo
   INST_ID SID_SERIAL    USERNAME   MACHINE         OSUSER                         STATUS    Size MB
---------- ------------- ---------- --------------- ------------------------------ -------- --------
         1   788,    1              iis1            oracle                         ACTIVE      2,073
         4   788,    1              iis4            oracle                         ACTIVE      1,928
         1   792,    1              iis1            oracle                         ACTIVE      1,168
         1   791,    1              iis1            oracle                         ACTIVE      1,149
         3   788,    1              iis3            oracle                         ACTIVE      1,111
         4   792,    1              iis4            oracle                         ACTIVE      1,092
         1   785,    1              iis1            oracle                         ACTIVE      1,064
         4   791,    1              iis4            oracle                         ACTIVE      1,064
         3   792,    1              iis3            oracle                         ACTIVE        757
         3   791,    1              iis3            oracle                         ACTIVE        738
         3   785,    1              iis3            oracle                         ACTIVE        436
         4   785,    1              iis4            oracle                         ACTIVE        411
         1   764,    4   SYS        iis1            oracle                         ACTIVE        340
         1   737,61477   DBSNMP     iis1            oracle                         ACTIVE        117
         3   703,33361   DBSNMP     iis3            oracle                         ACTIVE        113
         4   677,30159   DBSNMP     iis4            oracle                         ACTIVE         86
         4   795,    1              iis4            oracle                         ACTIVE         81
         1   795,    1              iis1            oracle                         ACTIVE         77
         4   794,    1              iis4            oracle                         ACTIVE         76
         3   795,    1              iis3            oracle                         ACTIVE         75
         1   794,    1              iis1            oracle                         ACTIVE         74
         3   794,    1              iis3            oracle                         ACTIVE         70
         1   645, 5393   ANPI       USR\APINTARIC   apintaric                      INACTIVE       50
         3   758,    5              iis3            oracle                         ACTIVE         39
         3   755,    2              iis3            oracle                         ACTIVE         24
         3   754,    2              iis3            oracle                         ACTIVE         22
         3   756,    2              iis3            oracle                         ACTIVE         21
         3   757,    3              iis3            oracle                         ACTIVE         21
         4   774, 5835   JAGO       CLT\JGOLUZA     jgoluza                        INACTIVE       10
         1   619,61303   LIMI       NIO\LMIHALIC    lmihalic                       INACTIVE        9
 
30 rows selected.
 
Top 30 from gv$sesstat view according generated redo logs
SQL>
If you want to concentrate on real oracle users (avoid core Oracle processes in result) place next condition in outer where clause:
and b.username is not null

When and how many redo logs generation occurred?

Beside current analyze in many times wider analyze/compare is even more interesting. So questions like:
  • When do we have most of redo log generation?
  • Where was the peak of log generation?
  • Did we have any "strange" redo log generation?
need a little different approach-query v$log_history view. It holds historic data which retention period is initially controlled with MAXLOGHISTORY, defined while creating database (fixed not changeable without recreation of control file) and CONTROL_FILE_RECORD_KEEP_TIME which is changeable. In mine case it was set to 31 days (exact number of days for longest month):
SQL> show parameter CONTROL_FILE_RECORD_KEEP_TIME
 
NAME_COL_PLUS_SHOW_PARAM       TYPE        VALUE_COL_PLUS_SHOW_PARAM
------------------------------ ----------- ---------------------------------------------
control_file_record_keep_time  integer     31
Script to gather data through mentioned period looks like.
/* -----------------------------------------------------------------------------
 Filename: rl.sql
  
 CR/TR#  :
 
 Purpose : redo logs distribution per hours on each day ...
 
 Date    : 07.08.2007.
 Author  : Damir Vadas, damir.vadas@hypo-alpe-adria.com
  
 Remarks : run as privileged user
 
 Changes (DD.MM.YYYY, Name, CR/TR#):
--------------------------------------------------------------------------- */
set pagesize 120;
set linesize 200;
col day for a8;
spool rl.txt
PROMPT Archive log distribution per hours on each day ...
 
select
  to_char(first_time,'YY-MM-DD') day,
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'00',1,0)),'999') "00",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'01',1,0)),'999') "01",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'02',1,0)),'999') "02",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'03',1,0)),'999') "03",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'04',1,0)),'999') "04",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'05',1,0)),'999') "05",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'06',1,0)),'999') "06",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'07',1,0)),'999') "07",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'08',1,0)),'999') "08",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'09',1,0)),'999') "09",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'10',1,0)),'999') "10",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'11',1,0)),'999') "11",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'12',1,0)),'999') "12",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'13',1,0)),'999') "13",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'14',1,0)),'999') "14",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'15',1,0)),'999') "15",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'16',1,0)),'999') "16",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'17',1,0)),'999') "17",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'18',1,0)),'999') "18",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'19',1,0)),'999') "19",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'20',1,0)),'999') "20",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'21',1,0)),'999') "21",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'22',1,0)),'999') "22",
  to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'23',1,0)),'999') "23",
  COUNT(*) TOT
from v$log_history
group by to_char(first_time,'YY-MM-DD')
order by day
;
Result looks like:
SQL>@rl
Archive log distribution per hours on each day ...

DAY 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 TOT
-------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- -----
11-01-14 0 0 23 16 17 16 16 16 22 39 23 18 22 18 18 18 22 18 19 16 19 16 16 17 425
11-01-15 24 23 17 18 21 16 16 16 22 18 20 19 19 18 18 21 20 18 20 16 18 16 16 17 447
11-01-16 40 39 43 24 17 16 16 16 22 18 18 21 21 18 19 19 22 18 19 17 18 16 16 16 509
11-01-17 25 23 18 16 17 16 16 16 22 18 21 18 20 18 18 18 24 18 18 17 20 16 16 17 446
11-01-18 25 23 21 16 18 17 16 17 21 43 18 19 26 18 20 40 21 18 20 16 18 16 16 17 500
11-01-19 24 24 22 16 17 16 16 16 23 18 19 18 23 19 18 19 19 18 22 16 21 16 16 17 453
11-01-20 24 24 19 16 17 16 16 16 22 18 19 18 24 18 18 19 70 18 19 18 17 16 16 17 495
11-01-21 24 23 20 16 17 16 16 16 22 18 18 20 48 25 46 57 22 18 18 17 20 16 16 17 546
11-01-22 24 27 22 16 17 16 16 16 22 18 18 19 21 18 18 21 20 18 18 17 20 16 16 17 451
11-01-23 24 19 19 16 17 16 16 16 22 18 18 18 21 18 20 18 21 18 20 17 18 16 16 17 439
11-01-24 24 21 19 16 17 16 16 16 22 18 20 18 21 18 21 18 21 18 19 17 17 16 16 17 442
11-01-25 24 23 18 16 17 16 16 16 43 18 18 18 25 18 115 41 23 18 19 17 20 16 16 18 589
11-01-26 23 22 19 16 17 16 16 16 22 18 21 18 30 18 43 18 20 18 22 16 21 16 16 16 478
11-01-27 21 23 23 16 17 16 16 16 22 18 18 20 22 20 40 97 155 145 155 93 109 116 164 214 1556
11-01-28 93 24 23 16 17 16 16 16 29 18 19 19 30 101 19 18 75 30 19 16 20 16 22 16 688
11-01-29 21 16 16 16 17 16 27 20 22 18 18 18 31 18 18 19 23 18 19 18 18 16 16 17 456
11-01-30 24 22 17 16 17 16 16 16 22 18 18 19 23 18 19 18 23 18 18 17 20 16 16 17 444
11-01-31 24 19 21 16 17 16 16 16 23 18 19 18 22 19 18 20 20 18 18 16 21 16 16 17 444
11-02-01 24 25 22 16 17 16 16 16 23 18 18 20 24 18 18 19 21 18 18 17 19 16 16 17 452
11-02-02 24 22 20 16 17 16 16 16 23 18 18 40 23 18 39 18 21 18 22 16 21 16 16 17 491
11-02-03 24 23 22 16 18 16 16 16 22 18 19 18 24 18 20 18 20 18 19 18 19 16 16 17 451
11-02-04 24 23 23 16 17 16 16 16 22 18 19 19 48 18 20 20 23 18 18 17 19 16 16 17 479
11-02-05 24 23 17 17 17 16 16 16 22 18 20 19 23 18 19 20 22 18 18 17 20 16 16 17 449
11-02-06 24 23 17 16 18 16 16 16 22 18 19 19 21 18 19 18 24 18 20 16 21 16 16 17 448
11-02-07 24 22 18 16 18 16 16 16 22 18 52 18 44 25 29 24 21 18 18 16 19 16 16 17 519
11-02-08 24 23 19 16 17 16 16 16 22 18 20 19 28 18 19 18 22 18 19 17 34 32 32 31 514
11-02-09 36 39 35 31 37 31 32 32 32 34 34 34 39 34 34 34 36 34 38 32 37 31 32 33 821
11-02-10 37 36 38 31 33 32 31 32 37 34 34 34 41 34 35 35 37 34 34 31 34 32 31 33 820
11-02-11 39 35 38 31 33 32 31 32 37 34 34 34 38 34 34 34 35 34 34 32 34 32 31 32 814
11-02-12 40 34 34 33 35 32 31 32 37 34 34 34 36 34 35 34 36 34 34 31 36 32 31 32 815
11-02-13 40 34 35 31 34 32 31 32 37 34 34 34 38 34 34 34 37 34 34 32 36 32 31 32 816
11-02-14 40 34 33 31 35 32 32 32 37 66 34 35 38 34 34 34 37 34 34 31 36 32 31 33 849
11-02-15 48 50 50 44 48 32 32 32 35 34 34 34 38 34 37 34 39 34 34 32 36 31 32 33 887
11-02-16 39 34 33 32 33 31 32 32 37 53 37 34 38 38 34 2 0 0 0 0 0 0 0 0 539

34 rows selected.

SQL>
Redo logs generation is grouped by hours where last column (TOT) is sum of all redo logs in one day. According this it is more then obvious where redo log generation was highest, so our interest may be focused on presented point in time.

How much is that in Mb?

Total redo logs size (and according that, archived log size) cannot be computed from previous query because not all redo log switches occur when redo log was full. For that you might want to use this very easy query:
SQL> select sum(value)/1048576 redo_MB from sys.gv_$sysstat where name = 'redo size';
 
   REDO_MB
----------
1074623.75
 
SQL>
If you want to calculate on instance grouping, then use this:
SQL> select inst_id, sum(value)/1048576 redo_MB from sys.gv_$sysstat where name = 'redo size'
  group by inst_id;
 
   INST_ID    REDO_MB
---------- ----------
         1 370325.298
         2   4712.567
         4 405129.283
         3 294457.100
 
SQL>
Both queries works on single instances as well.

Which segments are generating redo logs?

After we found out our point of interest, in mine case where were most of the redo logs generation, it is very useful to find out which segments (not tables only) are causing redo log generation. For that we need to use "dba_hist" based tables, part of "Oracle AWR (Automated Workload Repository)", which usage I have described in topic Automated AWR reports in Oracle 10g/11g. For this example I'll focus on data based on time period: 11-01-28 13:00-11-01-28 14:00. Query for such a task should be:
SELECT to_char(begin_interval_time,'YY-MM-DD HH24') snap_time,
        dhso.object_name,
        sum(db_block_changes_delta) BLOCK_CHANGED
  FROM dba_hist_seg_stat dhss,
       dba_hist_seg_stat_obj dhso,
       dba_hist_snapshot dhs
  WHERE dhs.snap_id = dhss.snap_id
    AND dhs.instance_number = dhss.instance_number
    AND dhss.obj# = dhso.obj#
    AND dhss.dataobj# = dhso.dataobj#
    AND begin_interval_time BETWEEN to_date('11-01-28 13:00','YY-MM-DD HH24:MI')
                                AND to_date('11-01-28 14:00','YY-MM-DD HH24:MI')
  GROUP BY to_char(begin_interval_time,'YY-MM-DD HH24'),
           dhso.object_name
  HAVING sum(db_block_changes_delta) > 0
ORDER BY sum(db_block_changes_delta) desc ;
Reduced result from previously shown query would be:
SNAP_TIME   OBJECT_NAME                    BLOCK_CHANGED
----------- ------------------------------ -------------
11-01-28 13 USR_RACUNI_MV                        1410112
11-01-28 13 TROK_TAB_RESEAU_I                     734592
11-01-28 13 TROK_VOIE_I                           638496
11-01-28 13 TROK_DATUM_ULAZA_I                    434688
11-01-28 13 TROK_PAIEMENT_I                       428544
11-01-28 13 D_DPX_VP_RAD                          351760
11-01-28 13 TROK_SVE_OK_I                         161472
11-01-28 13 I_DATPBZ_S002                         135296
11-01-28 13 IDS2_DATUM_I                          129904
11-01-28 13 IDS2_PZNBR                            129632
11-01-28 13 IDS2_IDS1_FK_I                        128848
11-01-28 13 IDS2_DATTRAN_I                        127440
11-01-28 13 IDS2_DATSOC_I                         127152
11-01-28 13 IDS2_VRSTA_PROD_I                     122816
...
Let us focus on first segment "USR_RACUNI_MV", segment with highest number of changed blocks (what mean directly highest redo log generation). Just for information, this is MATERIALIZED VIEW.

What SQL was causing redo log generation

Now when we know when, how much and what, time is to find out how redo logs are generated. In next query "USR_RACUNI_MV" and mentioned period are hard codded, because we are focused on them. Just to point that SQL that start with "SELECT" are not point of our interest because they do not make any changes.
SELECT to_char(begin_interval_time,'YYYY_MM_DD HH24') WHEN,
       dbms_lob.substr(sql_text,4000,1) SQL,
       dhss.instance_number INST_ID,
       dhss.sql_id,
       executions_delta exec_delta,
       rows_processed_delta rows_proc_delta
  FROM dba_hist_sqlstat dhss,
       dba_hist_snapshot dhs,
       dba_hist_sqltext dhst
  WHERE upper(dhst.sql_text) LIKE '%USR_RACUNI_MV%'
    AND ltrim(upper(dhst.sql_text)) NOT LIKE 'SELECT%'
    AND dhss.snap_id=dhs.snap_id
    AND dhss.instance_number=dhs.instance_number
    AND dhss.sql_id=dhst.sql_id
    AND begin_interval_time BETWEEN to_date('11-01-28 13:00','YY-MM-DD HH24:MI')
                                AND to_date('11-01-28 14:00','YY-MM-DD HH24:MI')
;
Result is like:
WHEN          SQL                                               inst_id       sql_id  exec_delta rows_proc_delta
------------- ------------------------------------------------- ------- ------------- ---------- ---------------
2011_01_28 13 DECLARE                                                 1 duwxbg5d1dw0q          0                0
                job BINARY_INTEGER := :job;
                next_date DATE := :mydate; 
                broken BOOLEAN := FALSE;
              BEGIN
                dbms_refresh.refresh('"TAB"."USR_RACUNI_MV"');
                :mydate := next_date;
                IF broken THEN :b := 1;
                ELSE :b := 0;
                END IF;
              END;                                                   
2011_01_28 13 delete from "TAB"."USR_RACUNI_MV"                       1 5n375fxu0uv89          0                0
For both of examples it was impossible to find out number of rows changed according operation that was performed. Let us see output of another example (NC_TRANSACTION_OK_T table) where we can meet with DDL that generate redo logs!
WHEN          SQL                                               inst_id       sql_id  exec_delta rows_proc_delta
------------- ------------------------------------------------- ------- ------------- ---------- ---------------
2011_01_28 13 alter table TAB.NC_TRANSACTION_OK_T                     4 g5gvacc8ngnb8          0               0
              shrink space cascade                               
If you are focused on pure number of changes, then you might to perform query where inst_id and sql_id are irrelevant (excluded from query). Here is a little modified previous example, for "Z_PLACENO" segment (pure oracle table):
SELECT when, sql, SUM(sx) executions, sum (sd) rows_processed
FROM (
      SELECT to_char(begin_interval_time,'YYYY_MM_DD HH24') when,
             dbms_lob.substr(sql_text,4000,1) sql,
             dhss.instance_number inst_id,
             dhss.sql_id,
             sum(executions_delta) exec_delta,
             sum(rows_processed_delta) rows_proc_delta
        FROM dba_hist_sqlstat dhss,
             dba_hist_snapshot dhs,
             dba_hist_sqltext dhst
        WHERE upper(dhst.sql_text) LIKE '%Z_PLACENO%'
          AND ltrim(upper(dhst.sql_text)) NOT LIKE 'SELECT%'
          AND dhss.snap_id=dhs.snap_id
          AND dhss.instance_Number=dhs.instance_number
          AND dhss.sql_id = dhst.sql_id
          AND begin_interval_time BETWEEN to_date('11-01-25 14:00','YY-MM-DD HH24:MI')
                                      AND to_date('11-01-25 15:00','YY-MM-DD HH24:MI')
        GROUP BY to_char(begin_interval_time,'YYYY_MM_DD HH24'),
             dbms_lob.substr(sql_text,4000,1),
             dhss.instance_number,
             dhss.sql_id
)
group by when, sql;
Result is like:
WHEN          SQL                                                                    exec_delta rows_proc_delta
------------- ---------------------------------------------------------------------- ---------- ---------------
2011_01_25 14 DELETE FROM Z_PLACENO                                                           4         7250031
2011_01_25 14 INSERT INTO Z_PLACENO(OBP_ID,MT_SIFRA,A_TOT)                                    4         7250830
              SELECT P.OBP_ID,P.MT_SIFRA,SUM(P.OSNOVICA)  
                FROM (SELECT OPI.OBP_ID,
                              OPO.MT_SIFRA,
                              SUM(OPO.IZNKN) OSNOVICA
                        WHERE OPI.OBP_ID = OPO.OPI_OBP_ID 
                          AND OPI.RBR = OPO.OPI_RBR 
                          AND NVL(OPI.S_PRETPOREZA,'O') IN ( 'O','N','A','Z','S')
                        GROUP BY OPI.OBP_ID,OPO.MT_SIFRA
                      )
Here you can see directly number executions and number of involved rows.

Query based on segment directly

Sometimes you do not want to focus on period, so your investigation may start with segment as starting point. For such a tasks I use next query. This is small variation of previous example where "USR_RACUNI_MV" segment is hard codded.
SELECT to_char(begin_interval_time,'YY-MM-DD HH24') snap_time,
       sum(db_block_changes_delta)
  FROM dba_hist_seg_stat dhss,
       dba_hist_seg_stat_obj dhso,
       dba_hist_snapshot dhs
  WHERE dhs.snap_id = dhss.snap_id
    AND dhs.instance_number = dhss.instance_number
    AND dhss.obj# = dhso.obj#
    AND dhss.dataobj# = dhso.dataobj#
    AND dhso.object_name = 'USR_RACUNI_MV'
  GROUP BY to_char(begin_interval_time,'YY-MM-DD HH24')
  ORDER BY to_char(begin_interval_time,'YY-MM-DD HH24');
Reduced result is:
   SNAP_TIME   SUM(DB_BLOCK_CHANGES_DELTA)
   ----------- ---------------------------
   ...
   11-01-28 11                     1224240
   11-01-28 12                      702880
 11-01-28 13                     1410112
   11-01-28 14                      806416
   11-01-28 15                     2008912
   11-01-28 16                     1103648
   ...
As you can see in accented row, the numbers are the same as at the begging of topic.