Update slow

Question

Hi
I have one upadte sql which will update 500,000 rows
it takes 40 minutes ,
pls help to tune this
update table1
set dt1 = 0,
val1 = 0
where recdate > sysdate -5;
the recdate having index
I try to use hint but no improvement, if i use cusror and commit every 1000 records
it will not help me due to it will take resource to fetch and commit,
that is why i write simple update statment but it take 40 mins
how to tune this statement

Answer 1

hi the table structure as follows
(c_code VARCHAR2(2) NOT NULL,
b_code VARCHAR2(6) NOT NULL,
dept VARCHAR2(2),
group_id VARCHAR2(2),
rec_no VARCHAR2(10) NOT NULL,
vd_no VARCHAR2(17),
bl VARCHAR2(17),
bl1 VARCHAR2(17),
entry_dt DATE,
mon      DATE,
load      VARCHAR2(5),
depart      VARCHAR2(5),
dest      VARCHAR2(5),
dest1 VARCHAR2(5),
brch           VARCHAR2(6),
soffice VARCHAR2(6),
id1 VARCHAR2(6),
id2 VARCHAR2(6),
id3 VARCHAR2(6),
id4 VARCHAR2(6),
id5 VARCHAR2(6),
no1      VARCHAR2(40),
no2      VARCHAR2(40),
id6 VARCHAR2(6),
term VARCHAR2(3),
pcs NUMBER(4,0),
wgt1 NUMBER(9,2),
wgt2      NUMBER(9,2),
volume NUMBER(9,2),
goods VARCHAR2(35),
clce           VARCHAR2(4),
name1 VARCHAR2(20),
sts DATE,
lta DATE,
ref1 VARCHAR2(50),
ref2      VARCHAR2(50),
recdate DATE,
dt1      NUMBER(12,2),
val1      NUMBER(12,2))
I update -- dt1 & val1 based on recdate
this recdate has index
EXPLAIN PLAN
Execution Plan
0 UPDATE STATEMENT Optimizer=ALL_ROWS (Cost=31 Card=53 Bytes=7
42)
1 0 UPDATE OF 'TABLE1'
2 1 INDEX (RANGE SCAN) OF 'IDX_RECDATE' (INDEX) (Cost=
4 Card=53 Bytes=742)