snapshot of a remote snapshot without pk

From: Ray Stell <stellr_at_cns.vt.edu>
Date: Mon, 09 Sep 2002 09:53:26 -0800
Message-ID: <F001.004CB238.20020909095326@fatcity.com>

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_at_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_at_remote.db;

EMPNO ENAME
---------- ----------

1 stellr

SQL> create snapshot emp3_e6_local_snap refresh fast WITH ROWID as

        select * from EMP3_E6_SNAP_at_remote.db; 
               *

ERROR at line 2:
ORA-23413: table "STELLR"."EMP3_E6_SNAP" does not have a snapshot log

Ray Stell stellr_at_vt.edu (540) 231-4109 KE4TJC 28^D

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Author: Ray Stell
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Received on Mon Sep 09 2002 - 12:53:26 CDT