Re: PL/SQL question
- From: Niall Litchfield <niall.litchfield@xxxxxxxxx>
- To: manoj.gurnani@xxxxxxxxxxxxx
- Date: Wed, 28 Sep 2005 14:49:51 +0100
This appears to me to be (I admit I only got half way through the code
before glazing over) some sort of do it yourself referential integrity. If
so you'll find that Oracle is rather better at it than you are.
On 9/28/05, manoj.gurnani@xxxxxxxxxxxxx <manoj.gurnani@xxxxxxxxxxxxx> wrote:
>
>
>
>
>
>
> Below is the code.
> the cursor has about 300000 recs.
> The details tables have large volume of data and some have about 30 recs
> for each ref_num in cursor.
> This script has to be run .Can performance be increased.
> I've tested this for 3000 recs in cursor and with lesser volume of data in
> detail table.
> time taken is 25 min.
> Note :index is not present in all detail tables on column used in filter.
>
>
> set timing on
> set serverout on size 1000000
> declare
> l_commit_interval number := 5000;
> l_where_clause varchar2(2000);
> l_cnt number := 0;
> l_owner varchar2(25) := 'OWNER1';
> l_index_cnt number := 4;
> type txn_rec_tab_cnt is record
> (
> tab_name varchar2(70),
> tab_aff_rows number(6):= 0
> );
> type t_tab_cnt is table of txn_rec_tab_cnt index by binary_integer;
> txn_tab_cnt t_tab_cnt;
> cursor c1 is
> select ref_num from trans
> where country_code = 'KK';
> cursor c2 is
> select a.owner||'.'||a.table_name table_name,b.column_name
> from all_tab_columns a,all_tab_columns b
> where a.column_name = 'CTRY'
> and a.table_name = b.table_name
> and b.column_name in ('REF_NUM','BILL_REF_NUM','FLDR_T2_ID','TXN_REF_NUM')
> and a.owner = l_owner
> and b.owner = l_owner;
>
> begin
> for curs1 in c1 loop
> l_cnt := l_cnt + 1;
> l_index_cnt := 4;
> for curs2 in c2 loop
> l_where_clause := ' where '||curs2.column_name || ' = :col1';
> execute immediate 'update '||curs2.table_name||' set ctry_cd = ''KK'''||
> l_where_clause
> using curs1.ref_num;
> txn_tab_cnt(l_index_cnt).tab_name := curs2.table_name;
> txn_tab_cnt(l_index_cnt).tab_aff_rows:=
> txn_tab_cnt(l_index_cnt).tab_aff_rows+sql%rowcount;
> l_index_cnt := l_index_cnt + 1;
> end loop;
> if mod(l_cnt,l_commit_interval) = 0 then
> commit;
> end if;
> end loop;
> commit;
> for j in 1..txn_tab_cnt.count loop
> dbms_output.put_line('No of rows updated in '||txn_tab_cnt(j).tab_name||'
> =
> '||txn_tab_cnt(j).tab_aff_rows);
> end loop;
> end;
> /
>
>
>
> rjamya
> <rjamya@xxxxxxxxx> To: manoj.gurnani@xxxxxxxxxxxxx
> Sent by: cc: oracle-l@xxxxxxxxxxxxx
> oracle-l-bounce@fr Subject: Re: PL/SQL question
> eelists.org <http://eelists.org>
>
>
> 09/28/2005 06:42
> PM
> Please respond to
> rjamya
>
>
>
>
>
>
> You don't show us the code, you don't tell us what version,platform, you
> don't tell us how much time it takes and you don't tell us how much time
> ti
> should take.
>
> Sorry, the crystal ball is broken, come back in 3 weeks.
>
> ps: 1 lakh is one hundred thousand.
> Raj
>
> On 9/28/05, manoj.gurnani@xxxxxxxxxxxxx <manoj.gurnani@xxxxxxxxxxxxx >
> wrote:
>
> Hi,
> I've a cursor which retrieves about 3 lakh recs from a table.(master)
>
> based on column value retrieved from cursor for each rec,there are other
> tables (detail) to be updated.
> The detail tables have large volumes of data.
> the question is how can the performance be improved to achieve the desired
> result.
>
>
>
>
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--
Niall Litchfield
Oracle DBA
http://www.niall.litchfield.dial.pipex.com
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