RE: Recording Destructive DDL

From: Hillman, Alex <Alex.Hillman_at_usmint.treas.gov>
Date: Mon, 11 Jun 2001 10:22:46 -0700
Message-ID: <F001.00324532.20010611102553@fatcity.com>

You are getting current SQL but you need to go thru all SQL for this session to find out if there was alter table drop (column).

Alex Hillman

Original Message-----
Sent: Wednesday, June 06, 2001 9:36 PM
To: Multiple recipients of list ORACLE-L

Obtaining the triggering statement is beyond my ken. If I use a "before" trigger
and a cursor,
select
lower(replace( q.sql_text,' ',null))
from v$sql q, v$sql_cursor c, v$session s where s.audsid=audsid and
s.prev_sql_addr=q.address and
q.address=c.parent_handle;

.
I get back

select
lower(replace( q.sql_text,' ',null))
from v$sql q, v$sql_cursor c, v$session s where s.audsid=audsid and
s.prev_sql_addr=q.address and
q.address=c.parent_handle;

If I do it as an after statement trigger I get back

deletefromcol$whereobj#=:1andintcol#=:2

which is the DML run against the sys object to execute the drop column request. Of course if
I do it as an "after" I cannot loop through the column_names to check for which one was dropped
because it already has been.

Ian MacGregor
Stanford Linear Accelerator Center
ian_at_slac.stanford.edu

-----Original Message-----
Sent: Wednesday, June 06, 2001 8:52 AM
To: Multiple recipients of list ORACLE-L

Also is there any view where I can see statements like create or drop schema object. In v$sqlarea I cannot see this type of DDL. I can see alter schema object.

It is 8.1.7 Solaris

As to the question - I did not try it but if owner of the trigger has access to$sqlarea you can inside trigger query v$sqlarea for current session and check if there are any alter... drop statements. Strange that oracle does not provide SQL statement as one of the trigger attributs.

Alex Hillman

-----Original Message-----
Sent: Tuesday, June 05, 2001 9:46 PM
To: Multiple recipients of list ORACLE-L

I've written a system event trigger which records information on when a table was dropped or truncated. I would also like to record when someone does an "alter table drop column..." The problem is determining when the alter statement includes the drop column clause. It looks like I have to use the ora_is_drop_column function, calling it for each column in the table and checking the return code. Is there a way of determing whether "drop column" was issued without using this function?

Ian MacGregor
Stanford Linear Accelerator Center
ian_at_slac.stanford.edu
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Author: MacGregor, Ian A.
INET: ian_at_SLAC.Stanford.EDU

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Author: Hillman, Alex
INET: Alex.Hillman_at_usmint.treas.gov

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