UPDATE join a
SET a.source = (SELECT b.source
FROM cs b
WHERE b.totid = a.totid);
Rick
-----Original Message-----
Sent: Wednesday, October 31, 2001 7:15 AM
To: Multiple recipients of list ORACLE-L
rows and 20 columns
hi guys,
i have a big problem in updating an oracle 8i 1.7 database table with
more than 50000 rows and 20 columns. The problem is: i have another table
with approximately 17000 rows and 12 columns. The latter one holds newer
data, and most of them have the same primary key as the previous one
(16000). Now, i want to update the older table with newer data from the new
table. I wrote a pl/sql procedure to achieve this task, but it takes too
long ( nearly 12 hours) ,
can you have a look at the below procedure and tell me what is wrong
with it and where i am making mistake? CAn you suggest me a faster and more
efficient way to do that?
thanks alot for your help in advance.
cheers :)
my Pl/sql procedure :
********************
declare
cursor c1 is
select c.totid,j.source from join j,cs c where j.source is not null
and trim(j.totid)=trim(c.totid);
--join is the new table (17700 rows)
--cs id the older one (50300rows)
tot cs.TOTID%type;--totid is the primary key for both tables
src cs.source%type;--source is the column to be updated
begin
open c1;
loop
fetch c1 into tot,src;
tot:=trim(tot);
exit when c1%notfound;
update cs set source=src where trim(totid)=tot;
end loop;
commit;
close c1;
end;
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