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10.22.2008 at 07:22PM PDT, ID: 23839416

	[x] Attachment Details

Please help improve the speed of the following update statement

[x]

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9.0

Zone:

Oracle 10.x

Tags:

Oracle, 10g

The following update statement is being ran 1 or more times during any given transaction.
An uncontrolable process drops and re-creates the tmp_table before this update statment is ran. Due to this the update statement cannot put a lock on tmp_table in case it is drop and re-created during this same transaction.

The current proccess works. But due to the fact that tmp_table can have 500,000+ rows and table A has 1 million + rows this update is VERY slow.

update table A
set
(
A.column1,
A.column2
) =
(
select B.column1
B.column2
from tmp_table B
where A.PK_1= B.PK_1
)
where
a.PK_1 =
(
select B.PK_1
from tmp_table B
where A.PK_1 = B.PK_2
)
and A.PK-2 =
(
select TO_DATE(B.PK_2, 'YYYYMMDDHH24MISS')
from tmp_table B
where A.PK_1 = B.PK_1
)

Can someone think of a possible alternative solution to this issue?

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Answered By:	sdstuber
Expert Since:	10/06/2003
Accepted Solutions:	1846
Computer Expertise:	Advanced

sdstuber has been an Expert for 5 years 3 months, during which he has posted 7484 comments and answered 1846 questions. sdstuber is just one of 761 experts in the Oracle 10.x Zone. 1 expert collaborated on this answer, which was graded an "A" by the asker.

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