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====== [HOWTO] DBMS_REDEFINITION usage ======

====== Previous Requirements ======

Name of te table to compact/redefine/reindex...

====== Official documentation ======

[[https://docs.oracle.com/database/121/ARPLS/d_redefi.htm]]
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(Oracle can move this document at any time)

====== Step 1: check if DBMS_REDEFINITION can be used ======

There are multiple ways to use DBMS_REDEFINITION.
I mainly use 2:
  * Using PK
  * Using ROWID
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I've been always be able to finish the whole process with any of this two methods.


===== Step 1.1: Check Using PK =====

<code sql>
BEGIN
  DBMS_REDEFINITION.CAN_REDEF_TABLE(
   uname        => 'SCHEMA_NAME',
   tname        => 'TABLENAME',
   options_flag => DBMS_REDEFINITION.CONS_USE_PK);
END;
/
</code>


===== Step 1.2: Using ROWID =====
<code sql>
BEGIN
  DBMS_REDEFINITION.CAN_REDEF_TABLE(
   uname        => 'SCHEMA_NAME',
   tname        => 'TABLENAME',
   options_flag => DBMS_REDEFINITION.CONS_USE_ROWID);
END;
/
</code>


====== Step 2: Creating pivot table ======
Or interim as named in oracle.
I prefer to use DBMS_METADATA to control the 100% of the process.

===== Step 2.1:  Using CREATE .. SELECT =====

This is the most basic way to create the pivot table:
<code sql>
create table SCHEMA_NAME.INT_V as select * from SCHEMA_NAME.TABLENAME WHERE 1 = 2;
</code>


===== Step 2.2: Using DBMS_METADATA =====
Obtain metadata:
<code sql>
SELECT DBMS_METADATA.GET_DDL('TABLE','TABLENAME', 'SCHEMA_NAME') FROM DUAL ;
</code>

Then modify the table name and if there's any ''LOB'' defined as ''BASICFILE'', re-define it as ''SECUREFILE'' (default in 11g and onward).


====== Step 3: begin redefinition ======
===== Step 3.1: Using PK =====

<code sql>
BEGIN
  DBMS_REDEFINITION.START_REDEF_TABLE(
   uname        => 'SCHEMA_NAME',
   orig_table   => 'TABLENAME',
   int_table    => 'INTM_TABLENAME',
   col_mapping  => NULL,
   options_flag => DBMS_REDEFINITION.CONS_USE_PK);
END;
/
</code>

===== Step 3.1: Using ROWID =====

<code sql>
BEGIN
  DBMS_REDEFINITION.START_REDEF_TABLE(
   uname        => 'SCHEMA_NAME',
   orig_table   => 'TABLENAME',
   int_table    => 'INTM_TABLENAME',
   col_mapping  => NULL,
   options_flag => DBMS_REDEFINITION.CONS_USE_ROWID);
END;
/
</code>

===== Step 3.1: Using ROWID with virtual columns=====

If the table has virtual columns you'll obtain a nice:
  ORA-01733: virtual column not allowed here

When using DBMS_REDEFINITION.
A little of tunning must be done while redefining the table.

Is necessary to specify the **NON-VIRTUAL** columns and pass them to DBMS_REDEFINITION (''l_colmap''  variable):

<code sql>
declare
    l_colmap varchar(512);
begin
    l_colmap := 'COLUMN1, COLUMN2, COLUMN3';

    dbms_redefinition.start_redef_table
    (  
   uname        => 'SCHEMA_NAME',
   orig_table   => 'TABLENAME',
   int_table    => 'INTM_TABLENAME',
      col_mapping    => l_colmap,
      options_flag => DBMS_REDEFINITION.cons_use_rowid );
end;
/
</code>

====== Step 4: copy table objects======

<code sql>
DECLARE
num_errors PLS_INTEGER;
BEGIN
    DBMS_REDEFINITION.COPY_TABLE_DEPENDENTS('SCHEMA_NAME', 'TABLENAME','INTM_TABLENAME',
    DBMS_REDEFINITION.CONS_ORIG_PARAMS, TRUE, TRUE, TRUE, TRUE, num_errors);
    dbms_output.put_line('Num_errors = ' || num_errors);
END;
/
</code>

Then check the errors:

<code sql>
select object_name, base_table_name, ddl_txt from DBA_REDEFINITION_ERRORS;
</code>

If there're index/pk's/fk's/constraints you'll see errors there cause DBMS_REDEFENITION will try to do it twice.

====== Step 5: Sync tables ======

<code sql>
BEGIN 
  DBMS_REDEFINITION.SYNC_INTERIM_TABLE('SCHEMA_NAME', 'TABLENAME', 'INTM_TABLENAME');
END;
/
</code>

====== Step 6: FINISH IT! ======

<code sql>
BEGIN
  DBMS_REDEFINITION.FINISH_REDEF_TABLE('SCHEMA_NAME', 'TABLENAME', 'INTM_TABLENAME');
END;
/
</code>


====== Example ======

<code sql>

SYS@BAVEL12R_1> 

BEGIN
  DBMS_REDEFINITION.CAN_REDEF_TABLE(
   uname        => 'VOXEL',
   tname        => 'SUPERTABLE_H',
   options_flag => DBMS_REDEFINITION.CONS_USE_PK);
END;
  7  /
BEGIN
*
ERROR at line 1:
ORA-12089: cannot online redefine table "DODGER"."SUPERTABLE_H" with no primary key
ORA-06512: at "SYS.DBMS_REDEFINITION", line 173
ORA-06512: at "SYS.DBMS_REDEFINITION", line 3759
ORA-06512: at line 2

SYS@BAVEL12R_1> 
BEGIN
  DBMS_REDEFINITION.CAN_REDEF_TABLE(
   uname        => 'VOXEL',
   tname        => 'SUPERTABLE_H',
   options_flag => DBMS_REDEFINITION.CONS_USE_ROWID);
END;
  7  /

PL/SQL procedure successfully completed.

SYS@BAVEL12R_1> SELECT DBMS_METADATA.GET_DDL('TABLE', 'SUPERTABLE_H', 'VOXEL') TXT FROM DUAL ;

TXT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

  CREATE TABLE "DODGER"."SUPERTABLE_H"
   (    "INTID_FAMPROV" NUMBER(19,0) NOT NULL ENABLE,
        "INTID_PROVEEDOR" NUMBER(19,0) NOT NULL ENABLE,
        "STRID_FAMILIA" VARCHAR2(128),
        "STRFAMILIA" VARCHAR2(128),
        "INTID_FAMILIA" NUMBER(19,0) NOT NULL ENABLE,
        "INTID_SUBFAMILIA" NUMBER(19,0) NOT NULL ENABLE,
        "TSMODIFICADO" TIMESTAMP (6) NOT NULL ENABLE,
        "INTMODIFIED_BY" NUMBER(19,0) NOT NULL ENABLE,
        "LOGACTIVE" NUMBER(19,0) NOT NULL ENABLE,
        "TSCHANGED" TIMESTAMP (6) WITH TIME ZONE
   ) SEGMENT CREATION IMMEDIATE
  PCTFREE 0 PCTUSED 40 INITRANS 1 MAXTRANS 255
 NOCOMPRESS LOGGING
  TABLESPACE "DODGER"  ENABLE ROW MOVEMENT ;


1 row selected.

SYS@BAVEL12R_1> 

CREATE TABLE "DODGER"."SUPERTABLE_REDEF"
   (    "INTID_FAMPROV" NUMBER(19,0) NOT NULL ENABLE,
        "INTID_PROVEEDOR" NUMBER(19,0) NOT NULL ENABLE,
        "STRID_FAMILIA" VARCHAR2(128),
        "STRFAMILIA" VARCHAR2(128),
        "INTID_FAMILIA" NUMBER(19,0) NOT NULL ENABLE,
        "INTID_SUBFAMILIA" NUMBER(19,0) NOT NULL ENABLE,
        "TSMODIFICADO" TIMESTAMP (6) NOT NULL ENABLE,
        "INTMODIFIED_BY" NUMBER(19,0) NOT NULL ENABLE,
        "LOGACTIVE" NUMBER(19,0) NOT NULL ENABLE,
        "TSCHANGED" TIMESTAMP (6) WITH TIME ZONE
   ) SEGMENT CREATION IMMEDIATE
  PCTFREE 0 PCTUSED 40 INITRANS 1 MAXTRANS 255
 NOCOMPRESS LOGGING
 15   TABLESPACE "DODGER"  ENABLE ROW MOVEMENT ;

Table created.

SYS@BAVEL12R_1> 

BEGIN
  DBMS_REDEFINITION.START_REDEF_TABLE(
   uname        => 'VOXEL',
   orig_table   => 'SUPERTABLE_H',
   int_table    => 'SUPERTABLE_REDEF',
   col_mapping  => NULL,
   options_flag => DBMS_REDEFINITION.CONS_USE_ROWID);
END;
  9  /


PL/SQL procedure successfully completed.

SYS@BAVEL12R_1> SYS@BAVEL12R_1> 
SYS@BAVEL12R_1> 

DECLARE
num_errors PLS_INTEGER;
BEGIN
    DBMS_REDEFINITION.COPY_TABLE_DEPENDENTS('VOXEL', 'SUPERTABLE_H','SUPERTABLE_REDEF',
    DBMS_REDEFINITION.CONS_ORIG_PARAMS, TRUE, TRUE, TRUE, TRUE, num_errors);
    dbms_output.put_line('Num_errors = ' || num_errors);
END;
  8  /

Num_errors = 7

PL/SQL procedure successfully completed.

SYS@BAVEL12R_1> SYS@BAVEL12R_1> 
SYS@BAVEL12R_1> r
  1* select object_name, base_table_name, ddl_txt from DBA_REDEFINITION_ERRORS

OBJECT_NAME                         BASE_TABLE_NAME                          DDL_TXT
----------------------------------- ---------------------------------------- ------------------------------------------------------------------------------------------------------------------------------------------------------
SYS_C0017232                        SUPERTABLE_H                  ALTER TABLE "DODGER"."SUPERTABLE_REDEF" MODIFY ("INTID_FAMPROV" CONSTRAINT "TMP$$_SYS_C00172320" NOT NULL ENABLE NOVALIDATE)
SYS_C0017233                        SUPERTABLE_H                  ALTER TABLE "DODGER"."SUPERTABLE_REDEF" MODIFY ("INTID_PROVEEDOR" CONSTRAINT "TMP$$_SYS_C00172330" NOT NULL ENABLE NOVALIDATE)
SYS_C0017234                        SUPERTABLE_H                  ALTER TABLE "DODGER"."SUPERTABLE_REDEF" MODIFY ("INTID_FAMILIA" CONSTRAINT "TMP$$_SYS_C00172340" NOT NULL ENABLE NOVALIDATE)
SYS_C0017238                        SUPERTABLE_H                  ALTER TABLE "DODGER"."SUPERTABLE_REDEF" MODIFY ("LOGACTIVE" CONSTRAINT "TMP$$_SYS_C00172380" NOT NULL ENABLE NOVALIDATE)
SYS_C0017236                        SUPERTABLE_H                  ALTER TABLE "DODGER"."SUPERTABLE_REDEF" MODIFY ("TSMODIFICADO" CONSTRAINT "TMP$$_SYS_C00172360" NOT NULL ENABLE NOVALIDATE)
SYS_C0017237                        SUPERTABLE_H                  ALTER TABLE "DODGER"."SUPERTABLE_REDEF" MODIFY ("INTMODIFIED_BY" CONSTRAINT "TMP$$_SYS_C00172370" NOT NULL ENABLE NOVALIDATE)
SYS_C0017235                        SUPERTABLE_H                  ALTER TABLE "DODGER"."SUPERTABLE_REDEF" MODIFY ("INTID_SUBFAMILIA" CONSTRAINT "TMP$$_SYS_C00172350" NOT NULL ENABLE NOVALIDATE)

7 rows selected.

SYS@BAVEL12R_1> 
BEGIN 
  DBMS_REDEFINITION.SYNC_INTERIM_TABLE('VOXEL', 'SUPERTABLE_H','SUPERTABLE_REDEF');
END;
/


PL/SQL procedure successfully completed.

SYS@BAVEL12R_1> 
BEGIN
  DBMS_REDEFINITION.FINISH_REDEF_TABLE('VOXEL', 'SUPERTABLE_H','SUPERTABLE_REDEF');
END;
  4  /

PL/SQL procedure successfully completed.

SYS@BAVEL12R_1> 

</code>