How to optimize the update statement so that the query is reading the same table?
Hi all
I have a process with the following UPDATE statement:
Sales_val update
SET ship_date =)
Select max (hist.ship_date)
FROM sales_hist hist
WHERE hist. X_ID = A.X_ID
AND hist. X_VAL = A.X_VAL)
) WHERE EXISTS (select * from sales_hist hist where )
WHERE hist. X_ID = A.X_ID
AND hist. X_VAL = A.X_VAL
)
sales_val - 50 lines mln (unique index)
sales_hist - 20 mln ranks (unique index)
I met many problems with waits and locks - how to optimize to avoid locks using the parameters of tables or changes of the declaration? or maybe is there another way to do optimization ?
Kind regards
Bolo
Thank you for that. Collect in bulk Unfortunatelly + FORALL does not work with the types in 10g - solution is to use the FOR loop and is not as effective as FORALL in many cases. I do still some tests to solve this problem - I'll put you once it's done.
EDIT: hash partitioning + fusion - 3-5 minutes (time), so for now it's the solution to the problem. Thank you all for the great discussion!
Tags: Database
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I use Oracle 11.2, I'd use SQL statements to update a column based on values in other rows in the same table. Here are the details:
create table TB_test (number 4 myId, crtTs date, date of MDPU);
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a.comappstat
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where a.workordersoi = b.workordersoi
and a.comappstat! = b.comappstat)
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ERROR on line 8:
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Thank youHello
First of all, after post 79, you need to know how to format your code.
Your last request reads as follows:
UPDATE mnt.workorders_copy SET comappstat = ( SELECT DISTINCT a.comappstat FROM mnt.workorders a , mnt.workorders_copy b WHERE a.workordersoi = b.workordersoi AND a.comappstat != b.comappstat ) WHERE a.comappstat != b.comappstat AND a.workordersoi = b.workordersoi
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The sub query allows you to define a and b and outside the breakets you can't refer to a or b.
There is no link between the mnt.workorders_copy and the the update and the request of void.If you do this you should have something like this:
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Speed is not so good that you run the query to sub for each row in mnt.workorders
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This way you can test the subquery first and know exectly what will be updated.
This was not a sub query that is executed for each line preformance should be better.Kind regards
Peter
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---------------------------------------------------------------------------------------------------------
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---------------------------------------------------------------------------------------------------
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When a row is inserted is recalculated to the PERMATTINELIGIBLE of all the records for that employee for that month.
There would be only two or three records for an employee for a month.
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If is not normally the day is not eligible for the premium of attendance for this employee.
but an exception is that if a short leaves of DISP employee allowed a month (IE. SSLINASTRETCH) in a straight line, IE. one day, that day is eligible for the bonus of presence.
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But when I try to create the trigger I get error, PL/SQL: ORA-00907: missing a right parenthesis.
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