Re: pl/sql help

as a variant on step 3

create table with records you want to keep (ctas)
truncate the original
insert append the records back to original

Minimal undo as well and no need to re-create triggers, indexes etc etc

downside => downtime

Jack

2009/7/31 Kenneth Naim <kennaim@xxxxxxxxx>

> There are a few issues with your program.
>
> 1. the in list variable cannot be list of values, it should be one number
> and only a one number. You can multiple variables (up to 1000), for all
> clause, or dynamic sql but all these methods are over kill development wise
> and are slower and use more undo over all so I won't go into them.
> 2. The developer had the right idea as a single statement will be faster
> than a loop but will use a lot more undo space. I would size the undo
> appropriate to the statement and if you want to reclaim the space later
> just
> create a new undo tablespace and swap them, and drop the big one.
> 3. Depending on how many rows we are talking about, it will most likely be
> much faster to create a new table as select the rows you want to keep, then
> add the appropriate constraints, triggers, indexes, statistics etc. on it.
> 4. If you don't want to go through step recommendation 3 then you should
> atleast drop the indexes on the table, then do the delete, then create the
> indexes. It will use 80+% less than undo and will be much faster;
> especially
> if you build the indexes in parallel/ nologging but remember to alter them
> logging noparallel (or whatever their parallel/logging state was from
> before
> dropping them).
>
> Ken
>
>
> -----Original Message-----
> From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
> On Behalf Of Sweetser, Joe
> Sent: Thursday, July 30, 2009 6:48 PM
> To: Oracle-L Group
> Subject: pl/sql help
>
> Greetings gurus,
>
> 10.2.0.2
> RH Linux AS4
>
> I am trying to write a pl/sql program to delete a bunch of records.
> This came up because a developer wrote a sql statement to delete
> everything but it was running out of undo space.  I thought it would be
> easy to throw into a pl/sql program and commit along the way to avoid
> that issue.
>
> The gist of it is that I am building a list of values to use in the
> delete statement and passing it in as a bind variable but am getting an
> error when executing it.  The SQL statement is "delete from table where
> column in (num1, num2, num3, num4,...num50);"  I am using a varchar to
> build the num1, num2, num3... list and then trying to pass the whole
> thing to sql statement on the execute immediate.  When I do, I get an
> invalid number error.  I think I am missing something obvious but can't
> figure it out.
>
> Here's the output from when I execute it.  I added the echo'ing of the
> sql statement and the list_of_values while trying to debug.  I have
> tried putting the ()'s in the list_of_values but get the same error.
>
> SQL> exec epicenter_delete.whack_it_all
> delete from pol_predetail where ParentObjID in (:1)
> 10110,10111,10112,10113,10114,10115,10116,10117,10118,10119,10120,10121,
> 10122,10123,10124,10125,10126,10145,10146,10147,10148,10149,10150,10151,
> 10152,10153,10154,10155,10156,10157,10158,10159,10160,10161,10162,10163,
> 10164,10165,10166,10167,10168,10169,10170,10171,10190,10191,10192,10193,
> 10194,10195
> BEGIN epicenter_delete.whack_it_all; END;
>
> *
> ERROR at line 1:
> ORA-01722: invalid number
> ORA-06512: at "JOE.EPICENTER_DELETE", line 194
> ORA-06512: at line 1
>
>
> Elapsed: 00:00:00.92
> SQL>
>
> The program goes something like this:
>
> PROCEDURE whack_it_all IS
>
>   SQL_Stmt     VARCHAR2(512);   -- holds sql stmt to executed
>   list_of_values     VARCHAR2(512);   -- holds id's to be deleted
>
> <snip>
>
>   CURSOR c1 IS
>   SELECT ParentObjID
>   FROM blah, blah, blah;
>
> <snip>
>
>   BEGIN
>
>   /* Initialize counters/variables */
>   tmp2_count := 0;
>   list_of_values := '';
>
>   FOR premium_detail_rec IN c1
>   LOOP
>     list_of_values := list_of_values || premium_detail_rec.ParentObjID;
>     tmp2_count := tmp2_count+1;
>     IF tmp2_count = 50
>     THEN
>         SQL_Stmt := 'delete from pol_predetail where ParentObjID in
> (:1)';
>         dbms_output.put_line (SQL_Stmt);
>         dbms_output.put_line (list_of_values);
>         EXECUTE IMMEDIATE SQL_Stmt using list_of_values;  <----- this
> is line 194
>         list_of_values := '';
>         tmp2_count := 0;
>     ELSE
>        list_of_values := list_of_values || ',';
>     END IF;
>   END LOOP;
>
>
> Any/all ideas/help appreciated.
>
> -joe
>
> --
> http://www.freelists.org/webpage/oracle-l
>
>
> --
> http://www.freelists.org/webpage/oracle-l
>
>
>


-- 
Jack van Zanen

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