RE: PL/SQL question
- From: manoj.gurnani@xxxxxxxxxxxxx
- To: oracle-l@xxxxxxxxxxxxx
- Date: Wed, 28 Sep 2005 19:15:29 +0530
Is it possible for all detail tables be updated without using a cursor.
can u explain with example.
"Kennedy, Jim"
<jim_kennedy@men To:
<manoj.gurnani@xxxxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
tor.com> cc:
Subject: RE: PL/SQL question
09/28/2005 07:02
PM
I don't see why you are using execute immediate. I think you could do it
all in one sql statement. To quote Mr. Kyte "Row by row is slow by slow".
I think you have over complicated it.
Jim
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx on behalf of
manoj.gurnani@xxxxxxxxxxxxx
Sent: Wed 9/28/2005 6:28 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: Re: PL/SQL question
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
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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