How fast an application update for 27 000 lines?

I used the following code from pl/sql using bulk collect to update a table called dwd_candidate_new. But it takes nearly 20 minutes to update record 27000. Is there a work around to make it faster?

Thank you.

declare

T_ServiceId. ARRAY TYPE IS VARCHAR2 (30);

T_Comments. ARRAY TYPE IS VARCHAR2 (30);

v_ServiceId t_ServiceId;

v_Comments t_Comments;

Start

Select s.c1, s.c4

COLLECTION in BULK IN v_ServiceId, v_Comments

of s dwd_report_stg

s.file_id = p_file_id;                   

FORALL indx IN v_Comments.FIRST... v_Comments.Last

UPDATE dwd_candidate_new

Set sdt_receive = sysdate,

sdt_comments = v_Comments (indx)

where service_id = v_ServiceId (indx);

end;

Why you use bulk collect and forall? If performance is a problem, I would start by trying to do this as a single SQL UPDATE or a MERGE statement. Make sure you have updated on tables and indexes statistics and see what the optimizer based on CSSTidy comes with.

Something like the following should work (untested so please excuse the mistakes of syntax)

MERGE INTO dwd_candidate_new tgt
USING (
SELECT c1, c4
FROM dwd_report_stg
WHERE file_id = p_file_id
) src
ON (src.c1 = tgt.service_id)
WHEN MATCHED THEN
UPDATE SET tgt.sdt_receive=sysdate, tgt.sdt_comments = src.c4;

In addition, there are a few mistakes in your PL/SQL - there seems to be a keyword WHERE in the SELECT statement, and the variable p_file_id is undeclared.

It would be useful if you could create post instructions, sample data and code of work table.

Hope that helps

Dan

Tags: Database

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