Insert into rules

Question

Hi,
I have a query that joins several tables and I want to insert the result into a temp table.
The tables I am doing the joins from are all indexed but I have not indexed the table I created as a temp.
The query takes about 5 minutes but the insert into takes a lot longer.
see below the sql. Hope the format is legible
What do I have to consider?
DROP TABLE database.TEMP1
create table database.TEMP1
src_fl_cd               CHAR(5),
excl_typ_cd          CHAR(1),
cntct_typ_cd          CHAR(15),
taxpayer_id          DECIMAL(9,0),
eff_dt               DATE,
vld_email_until_dt      DATE,
ssn_flag               VARCHAR2(1),
ACCT_flag               VARCHAR2(1),
EMAIL_IND_FLAG          VARCHAR2(1)
INSERT INTO database.TEMP1
select x.src_fl_cd,
x.excl_typ_cd,
x.cntct_typ_cd,
y.taxpayer_id,
z.eff_dt,
z.vld_email_until_dt,
case when x.excl_typ_cd = 'N' and x.cntct_typ_cd ='email' then 'N' else 'Y' END,
NULL,
NULL
from
database.cust_cntct x,
select b.cust_ref_ky,
a.taxpayer_id
from database.table1 a,
dtabase.table2 b
where a.taxpayer_id = b.tin_num
) y,
database.src_fl_typ_expir z
where x.cust_ref_ky = y.cust_ref_ky
and x.excl_typ_cd = 'N'
and x.cntct_typ_cd = 'email'
and x.src_fl_cd = z.src_fl_cd

Answer 1

Hallo,
is your table really temporary ? (Youre create table statement has not keyword "TEMPORARY" an COMMIT - Rule).
It exists performance problems with insert of huge amount of data in temporary table. You can try to use "normal" table instead of "temporary" and compare performance.
Once more, I am not sure, that you really use temporary table
Regards
Dmytro