Question

Oracle 10g: SQL - PL/SQL script needed to recover "deleted" groups in a table

Asked by: Tolomir

Hello,

I got this table

ID..................NAME......................................................DELETED
8412890........AG-ENV..................................................0
71294............AG-ENV (Delete) 71294.........................1
8412891........AG-EWMV...............................................0
46820............AG-EWMV (Delete) 46820......................1
8412892........AG-GIS...................................................0
61738............AG-GIS (Delete) 61738..........................1

This is a table of groups, that are automatically created by a LDAP synchronization.

Now in case of a LDAP error, it could happen that all groups are deleted.
So on the next synchronization, these deleted groups, that always exists in the LDAP tree, are recreated and I get entries like shown above.
(A group with the same name but new ID is created, but since file permissions were granted for the old ID, this is quite useless for me)

I'm looking for a sql statement, that:

identifies all group names that were deleted and for which a new group was created like this

ID..................NAME......................................................DELETED
8412892........AG-GIS...................................................0
61738............AG-GIS (Delete) 61738..........................1

Then deletes the group with number "8412892" and modifies "61738" back to

61738............AG-GIS...................................................0

This should be repeated for all such pairs.

On the next synchronization, the remaining "old" group will be re-recognized and handled as if the former deletion did not happen at all.

I would execute that script in an emergency recovery case.

Regarding performance, there are about 800 groups I have to deal with so a (PL/SQL) script would be really useful!

Thank you,
Tolomir

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Asked On
2007-08-16 at 07:44:53ID22767082
Tags

oracle

,

10g

,

deleted

,

sql

Topics

Oracle 10.x

,

PL / SQL

Participating Experts
1
Points
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Comments
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Answers

 

by: TolomirPosted on 2007-08-16 at 08:00:39ID: 19708804

Just to emphasize the matter:

We start here:

ID..................NAME......................................................DELETED
71294............AG-ENV..................................................0
46820............AG-EWMV...............................................0
61738............AG-GIS...................................................0

Now synchronization fails, we get:

ID..................NAME......................................................DELETED
71294............AG-ENV (Delete) 71294.........................1
46820............AG-EWMV (Delete) 46820......................1
61738............AG-GIS (Delete) 61738..........................1

Now new synchronization is successful, we get:

ID..................NAME......................................................DELETED
8412890........AG-ENV..................................................0
71294............AG-ENV (Delete) 71294.........................1
8412891........AG-EWMV...............................................0
46820............AG-EWMV (Delete) 46820......................1
8412892........AG-GIS...................................................0
61738............AG-GIS (Delete) 61738..........................1

---

I want a script that reverts that process back to:

ID..................NAME......................................................DELETED
71294............AG-ENV..................................................0
46820............AG-EWMV...............................................0
61738............AG-GIS...................................................0

---
I got oracle 10g standard edition so there is no flashback. Apart from that it might be inconsistent with the other tables... So that script should leave new independent entries alone, just fix the accidential "deleted" groups.

Tolomir

 

by: lumolnarPosted on 2007-08-17 at 04:30:34ID: 19715893

SELECT * FROM b;

ID,NAME,DELETED
8412890,AG-ENV,0
71294,AG-ENV (DELETE) 71294,1
8412891,AG-EWMV,0
46820,AG-EWMV (DELETE) 46820,1
8412892,AG-GIS,0
61738,AG-GIS (DELETE) 61738,1

DECLARE
  CURSOR recstoupdate IS
    SELECT b.*,  regexp_replace(b.name, ' \(DELETE\).*','') AS namefordel
        FROM b
       WHERE deleted = '1'
         AND EXISTS (SELECT 1 FROM b b1 WHERE b1.deleted = '0' AND b1.name = regexp_replace(b.name, ' \(DELETE\).*',''));
BEGIN
  FOR rec IN recstoupdate LOOP
    dbms_output.put_line('deleting:'||rec.namefordel);
      DELETE FROM b WHERE name = rec.namefordel AND deleted = '0';
      dbms_output.put_line('updating:"'||rec.name||'" to "'||rec.namefordel||'"');
      UPDATE b SET b.name = rec.namefordel, b.deleted = '0' WHERE b.id = rec.id AND b.deleted = '1';
  END LOOP;
  -- commit;
END;
/

SELECT * FROM b;

ID,NAME,DELETED
71294,AG-ENV,0
46820,AG-EWMV,0
61738,AG-GIS,0

hmm, this anonymous pl/sql block first selects all records which were deleted (DELETED='1') but also were
recreated back (AND EXISTS condition).
After this it delete recreated records and update their names and
deleted status back. If you want to make changes permanent remove -- from line
where commit resides, otherwise you should execute rollback;

--d.

 

by: TolomirPosted on 2007-08-17 at 05:13:41ID: 19716077

cool, will give it a try and report back. Thank you.

 

by: TolomirPosted on 2007-08-29 at 04:48:37ID: 19790256

I did not forget you, I just didn't had time to test this script, report with the next week.

 

by: TolomirPosted on 2007-09-06 at 07:28:23ID: 19840328

Great job.

Thank you!

Tolomir

20120131-EE-VQP-002

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