The lowest SCN in an existing LogMiner dictionary

What is the SQL query to know the SNA lowest in the existing Logminer dictionary that can be used as the FIRST_SCN of a NEW procedure of collection?

Thank you.

You must delete the lines in system.logmnr_restart_ckpt$ when their SNA is less than the new first_scn.
column spare1 hole of the LCR CNS. Here's a test case:

For streams, it is clear that losing an archive means data will not be replicated.
Normally, you're supposed to re - export the source site and import into the target site.
Given that it is not always possible, we will explore a different scenario.
Needless to say that this is not supported by Oracle.

(1) from a healthy state of mind, we will:
-export the data dictionary
-Stop the capture
-Switch logfile
-Insert rows in the source, it will enter the new log file
-Switch logfile
-export the data dictionary
-remove the archive between the data dictionary 2 exports.
-Restart the capture.

After having done this, we created a corrupt streams environment that we had
to get back on track with some data on the left.
We will study this:

We are building a new data dict

[stream01:SRCV10G]:/home/oracle> cap -build -x

set serveroutput on
variable f_scn number;
begin
:f_scn := 0;
dbms_capture_adm.build(:f_scn);
dbms_output.put_line('the first_scn value is ' || :f_scn);
end;
/
PL/SQL procedure successfully completed.

[stream01:SRCV10G]:/oracle/home> cap -stop CAPTURE_SCOTT -x
execute  DBMS_CAPTURE_ADM.STOP_CAPTURE( capture_name => 'CAPTURE_SCOTT');
PL/SQL procedure successfully completed.

Then connect us as sysdba and switch logfile.

SQL> alter system switch logfile;
System altered.

Now, we insert a LINE that will never be on the target site, because we intend to remove
This archive until the capture can eveer treat this. Capture will be forced
to jump over this archive and its contents if she ever wants to restart.

sqlplus  scott/tiger and some sql to insert a new row into scott.t1

old   1: insert into t1 values (&max_col1+1,'SRC',systimestamp)
new   1: insert into t1 values (      2314+1,'SRC',systimestamp)

1 row created.

[stream01:SRCV10G]:/home/orcle> view_t1.ksh

      2315 SRC                                                2009-11-12 14:32:10.229045
      2314 SRC                                                2009-11-12 11:34:41.644761
      2313 SRC                                                2009-11-12 11:23:54.914966
      2312 SRC                                                2009-11-12 11:04:07.953361
      2311 MYSQYPOQBAQOPUKWEVJCFHPHUCLSLMNIZEJBPPJFZLQYJHAGUS 2009-11-09 15:11:37.878694

Now it's time to pass logfile, export again a new datadict
and remove the logs to check-in between:

SQL> alter system switch logfile ;
System altered.

Before removing the archive that we need to be sure there aren't any mode active or we corrupt
and our database failed: If so, then a 'clear the no archived log file' will speed up the call for DBWR.

[stream01:SRCV10G]:/home/orcle> rdl
                                                                                                               Size
Group    THREAD#                    Member                     Archived     Status    SEQUENCE#  FIRST_CHANGE# (MB)
----- ---------- --------------------------------------------- ---------- ---------- ---------- -------------- ----
    1          1 /oradata/datafiles/SRCV10G/redo01.log         YES        ACTIVE             67        2143941   50
    2          1 /oradata/datafiles/SRCV10G/redo02.log         YES        ACTIVE             66        2143738   50
    3          1 /oradata/datafiles/SRCV10G/redo03.log         NO         CURRENT            68        2143966   50

SQL> alter database clear unarchived logfile group 1 ;
Database altered.

SQL> alter database clear unarchived logfile group 2 ;
Database altered.

[stream01:SRCV10G]:/home/orcle> rdl

                                                                                                               Size
Group    THREAD#                    Member                     Archived     Status    SEQUENCE#  FIRST_CHANGE# (MB)
----- ---------- --------------------------------------------- ---------- ---------- ---------- -------------- ----
    1          1 /oradata/datafiles/SRCV10G/redo01.log         YES        UNUSED              0        2143941   50
    2          1 /oradata/datafiles/SRCV10G/redo02.log         YES        UNUSED              0        2143738   50
    3          1 /oradata/datafiles/SRCV10G/redo03.log         NO         CURRENT            68        2143966   50

Our archives stands like:

                                                                                 Standby Deleted         Dic
   THREAD#  SEQUENCE#      First time             Next time       APP Status      Dest   By Rman REGISTR Beg
---------- ---------- --------------------- --------------------- --- ---------- ------- ------- ------- ---
         1         70 2009-11-12 14:33:22   2009-11-12 14:33:26   NO      A        NO      NO    ARCH    YES
         1         69 2009-11-12 14:33:22   2009-11-12 14:33:22   NO      A        NO      NO    ARCH    NO
         1         68 2009-11-12 14:32:29   2009-11-12 14:33:22   NO      A        NO      NO    ARCH    NO
         1         67 2009-11-12 14:31:53   2009-11-12 14:32:29   NO      A        NO      NO    ARCH    NO
         1         66 2009-11-12 14:31:26   2009-11-12 14:31:53   NO      A        NO      NO    ARCH    NO
         1         65 2009-11-12 14:31:24   2009-11-12 14:31:26   NO      A        NO      NO    RMAN    YES
         1         64 2009-11-12 14:31:24   2009-11-12 14:31:24   NO      A        NO      NO    ARCH    NO
         1         63 2009-11-12 11:25:05   2009-11-12 14:31:24   NO      A        NO      NO    ARCH    NO

We have 2 dictionary on archive 65 and 70.
So we can jump over 66,67,68 and 69 and jump their content. Once we're done permanently lose
the ability to replicate the line 2315, which has been created on source archive 66 was active:

[stream01:SRCV10G]:/oraadm01/app/oracle/flash_recovery_area/SRCV10G/archivelog/2009_11_12> ll
-rw-r----- 1 oracle oinstall  9395712 Nov 12 11:25 o1_mf_1_62_5hqrn1wg_.arc
-rw-r----- 1 oracle oinstall  7015424 Nov 12 14:31 o1_mf_1_63_5hr3kd9v_.arc
-rw-r----- 1 oracle oinstall     1024 Nov 12 14:31 o1_mf_1_64_5hr3kddm_.arc
-rw-r----- 1 oracle oinstall  9426944 Nov 12 14:31 o1_mf_1_65_5hr3kgk7_.arc
-rw-r----- 1 oracle oinstall    90112 Nov 12 14:31 o1_mf_1_66_5hr3l90x_.arc
-rw-r----- 1 oracle oinstall    10752 Nov 12 14:32 o1_mf_1_67_5hr3mflf_.arc
-rw-r----- 1 oracle oinstall    13312 Nov 12 14:33 o1_mf_1_68_5hr3o2mf_.arc
-rw-r----- 1 oracle oinstall     1024 Nov 12 14:33 o1_mf_1_69_5hr3o2nt_.arc
-rw-r----- 1 oracle oinstall  9414144 Nov 12 14:33 o1_mf_1_70_5hr3o6lt_.arc

[stream01:SRCV10G]:/oraadm01/app/oracle/flash_recovery_area/SRCV10G/archivelog/2009_11_12>
rm o1_mf_1_69_5hr3o2nt_.arc o1_mf_1_68_5hr3o2mf_.arc o1_mf_1_67_5hr3mflf_.arc  o1_mf_1_66_5hr3l90x_.arc

We finally managed to created a, irreversible coruption in our environment of data flow.
We will restart the capture, he will wait for you to do it again:

[stream01:SRCV10G]:/home/oracle> cap -start capture_scott -x

 Log                        Captured                   Capture
  ID Capture user           Start scn   CHANGE_TIME    Type       Rule set Name   Neg rule set    Status
---- -------------------- ------------- -------------- ---------- --------------- --------------- --------
  61 STRMADMIN                  2135135 12-11 14:35:33 LOCAL      RULESET$_44                     ENABLED

                                                                                                                 Last remote
 Log                                                        Last system    Last scn      Delay      Last scn      confirmed      Delay
  ID Capture name           QUEUE_NAME                          scn         Scanned     Scanned     enqueued     scn Applied  Enq-Applied
---- ---------------------- ------------------------------ ------------- ------------- ---------- ------------- ------------- -----------
  61 CAPTURE_SCOTT          SCOTT_CAP_Q                          2144965       2143738       1227             0       2143220    -2143220

 Log Process                                                                   Row creation                  total msg  total msg
  ID   Name          SID    SERIAL# STATE                    Capture at        initial time          Lat(s)   Captured    Enqueue
---- -------- ---------- ---------- ------------------------ ----------------- ----------------- ---------- ---------- ----------
  61 C001            140         23 WAITING FOR REDO         14:35:47 11/12/09                          263       5100          0

It's expected flow behaviour when archives are missing and the counters of the situations like:

[stream01:SRCV10G]:/home/oracle> cap -lck
                                                                               Checkpoint
                                                                               Retention    Last scn      Requiered         Max
Capture name               First scn     Start scn  Applied scn   Captured scn    time      Enqueued    Checkpoint scn Checkpoint scn
---------------------- ------------- ------------- ------------- ------------- ---------- ------------- -------------- --------------
CAPTURE_SCOTT                2135135       2135135       2143220       2143220          1             0        2137328        2143220

[stream01:SRCV10G]:/home/oracle> apl
   THREAD#  SEQUENCE#      First time             Next time       APP Status      Dest   By Rman REGISTR Beg
---------- ---------- --------------------- --------------------- --- ---------- ------- ------- ------- ---
         1         70 2009-11-12 14:33:22   2009-11-12 14:33:26   NO      A        NO      NO    ARCH    YES
         1         69 2009-11-12 14:33:22   2009-11-12 14:33:22   NO      A        NO      NO    ARCH    NO
         1         68 2009-11-12 14:32:29   2009-11-12 14:33:22   NO      A        NO      NO    ARCH    NO
         1         67 2009-11-12 14:31:53   2009-11-12 14:32:29   NO      A        NO      NO    ARCH    NO
         1         66 2009-11-12 14:31:26   2009-11-12 14:31:53   NO      A        NO      NO    ARCH    NO

Now, let's find the new value appropriate for the new FIRST_SCN that will allow us to ignore the content of archive 66-> 69

[stream01:SRCV10G]:/home/oracle> apl -n

If 'Name' is empty then the archive is not on disk anymore

   THREAD# Logseq  Start          End             First Change   Next Change   Name
---------- ------- -------------- -------------- -------------- -------------- -------------------------------------------------------
         1      70 11-12 14:33:22 11-12 14:33:26        2144015        2144611 /oraadm01/app/oracle/flash_recovery_area/SRCV10G/archiv
                                                                               elog/2009_11_12/o1_mf_1_70_5hr3o6lt_.arc
         1      69 11-12 14:33:22 11-12 14:33:22        2144013        2144015 /oraadm01/app/oracle/flash_recovery_area/SRCV10G/archiv
                                                                               elog/2009_11_12/o1_mf_1_69_5hr3o2nt_.arc

The new FIRST_SCN must be in an archive with a dictionary, so here it is 70 and the value is 2144015.
But oracle performs a check on FIRST_SCN<>
It's embarrassing because it will prevent the reset of the FIRST_SCN:

dbms_capture_adm.alter_capture( capture_name => 'CAPTURE_SCOTT',first_scn=> 2144015);
DECLARE
*
ERROR at line 1:
ORA-26667: invalid STREAMS parameter FIRST_SCN
ORA-06512: at "SYS.DBMS_CAPTURE_ADM_INTERNAL", line 166
ORA-06512: at "SYS.DBMS_CAPTURE_ADM", line 212
ORA-06512: at line 28

The trick is to remove the system. LOGMNR_RESTART_CKPT$ all CRL
whose YVERT is less than the first SCN of archives 70, which is 2144015:

SQL> delete from system.logmnr_restart_ckpt$ where spare1 < 2144015 ;
4 rows deleted.

SQL> commit ;
Commit complete.

SQL> exec dbms_capture_adm.alter_capture(capture_name => 'CAPTURE_SCOTT',
                               first_scn=>2144015 ,start_scn=>2144015 ) ;

PL/SQL procedure successfully completed.

SQL> exit

The new situation is

[stream01:SRCV10G]:/home/oracle> cap -lck
                                                                               Checkpoint
                                                                               Retention    Last scn      Requiered         Max
Capture name               First scn     Start scn  Applied scn   Captured scn    time      Enqueued    Checkpoint scn Checkpoint scn
---------------------- ------------- ------------- ------------- ------------- ---------- ------------- -------------- --------------
CAPTURE_SCOTT                2144015        2144015             0             0          1                            0              0

Now, we can restart the capture:

[stream01:SRCV10G]:/home/oracle> cap -start capture_scott  -x

 Log                        Captured                   Capture
  ID Capture user           Start scn   CHANGE_TIME    Type       Rule set Name   Neg rule set    Status
---- -------------------- ------------- -------------- ---------- --------------- --------------- --------
  61 STRMADMIN                  2144015  12-11 14:39:29 LOCAL      RULESET$_44                     ENABLED

                                                                                                                 Last remote
 Log                                                        Last system    Last scn      Delay      Last scn      confirmed      Delay
  ID Capture name           QUEUE_NAME                          scn         Scanned     Scanned     enqueued     scn Applied  Enq-Applied
---- ---------------------- ------------------------------ ------------- ------------- ---------- ------------- ------------- -----------
  61 CAPTURE_SCOTT          SCOTT_CAP_Q                          2145254       2145084        170             0       2144015 -2144611

 Log Process                                                                   Row creation                  total msg  total msg
  ID   Name          SID    SERIAL# STATE                    Capture at        initial time          Lat(s)   Captured    Enqueue
---- -------- ---------- ---------- ------------------------ ----------------- ----------------- ---------- ---------- ----------
  61 C001            140         25 CAPTURING CHANGES        14:39:33 11/12/09                            4        410          0

We insert on the source of a new LINE and this line must be present on the target
even with the largest previous is still missing on the same target:

sqlplus  scott/tiger and some sql to insert a new row into scott.t1

old   1: insert into t1 values (&max_col1+1,'SRC',systimestamp)
new   1: insert into t1 values (      2315+1,'SRC',systimestamp)

1 row created.

[stream01:SRCV10G]:/home/orcle> view_t1.ksh

      2316 SRC                                                2009-11-12 14:40:48.766265
      2315 SRC                                                2009-11-12 14:32:10.229045
      2314 SRC                                                2009-11-12 11:34:41.644761
      2313 SRC                                                2009-11-12 11:23:54.914966
      2312 SRC                                                2009-11-12 11:04:07.953361

On target we have :

[stream02:TRGV10G]:/home/oracle> view_t1.ksh
      2316 SRC                                                2009-11-12 14:40:48.766265
      2314 SRC                                                2009-11-12 11:34:41.644761
      2312 SRC                                                2009-11-12 11:04:07.953361
      2311 MYSQYPOQBAQOPUKWEVJCFHPHUCLSLMNIZEJBPPJFZLQYJHAGUS 2009-11-09 15:11:37.878694
      2310 LVRVXMSBXMWSWMYCLAISJPDLMACODJAUXIBWMWFTYGPMRPISTG 2009-11-09 15:11:37.877670

As the planned line 2315, which is in the archive deleted 66 is missing
on the target, but replication is restarted with line 2316 with is in
Archives of 70

Tags: Database

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