Message-ID: <F001.004CB238.20020909095326@fatcity.com>
Date: Mon, 09 Sep 2002 09:53:26 -0800
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From: Ray Stell <stellr@cns.vt.edu>
Subject: snapshot of a remote snapshot without pk
Organization: Fat City Network Services, San Diego, California
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short question, log demo:

Since I can't make a snapshot of a remote partition (this is really
what I wanted in the first place), I make a snapshot on the remote
machine first and then snapshot the remote snapshot.  This works if
there is a PK on the remote original table, but not if I try to use
rowid.  Below is the demo, can anyone suggest a workaround?


demo that it works with pk:
===========================
on remote machine:
------------------
SQL> CREATE TABLE EMP2
   (EMPNO NUMBER(4) NOT NULL,
    ENAME VARCHAR2(10)
   )
   PARTITION by range (empno)
     (partition e6 values less than (6),
      partition e12 values less than (12),
      partition e18 values less than (maxvalue))
/

Table created.

SQL> alter table emp2  add constraint emp_pk primary key(empno);

Table altered.

(insert some data)

create snapshot emp2_snap as select * from emp2 partition (e6);

SQL> create snapshot emp2_snap as select * from emp2 partition (e6);

Materialized view created.

SQL> select * from emp2_snap;

     EMPNO ENAME
---------- ----------
         1 stellr


on local machine:
-----------------

SQL> create snapshot emp2_local_snap as select * from emp2_snap@remote.db;

Materialized view created.

SQL> select * from emp2_local_snap;

     EMPNO ENAME
---------- ----------
         1 stellr


demo of failure without pk:
===========================
on remote machine:
------------------
CREATE TABLE EMP3
   (EMPNO NUMBER(4) NOT NULL,
    ENAME VARCHAR2(10)
   )
   PARTITION by range (empno)
     (partition e6 values less than (6),
      partition e12 values less than (12),
      partition e18 values less than (maxvalue))
/

(insert some data)

SQL> create snapshot log on emp3 with rowid;   (can't create the snap without this log)

Materialized view log created.

create snapshot emp3_e6_snap refresh fast WITH ROWID as select * from emp3 partition (e6);

SQL> create snapshot emp3_e6_snap refresh fast WITH ROWID as select * from emp3 partition (e6);

Materialized view created.

SQL> select * from emp3_e6_snap;

     EMPNO ENAME
---------- ----------
         1 stellr


on local machine:
-----------------
SQL> select * from EMP3_E6_SNAP@remote.db;

     EMPNO ENAME
---------- ----------
         1 stellr

SQL> create snapshot emp3_e6_local_snap refresh fast WITH ROWID as
        select * from EMP3_E6_SNAP@remote.db; 
               *
ERROR at line 2:
ORA-23413: table "STELLR"."EMP3_E6_SNAP" does not have a snapshot log
===============================================================
Ray Stell   stellr@vt.edu     (540) 231-4109     KE4TJC    28^D
-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Ray Stell
  INET: stellr@cns.vt.edu

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