On query performance problem. Need help.

It is essentially a performance problem. I hope someone can help me with that.

Basically, I have four old masters (150000 records), (100000 records) Child1, Child2 (50 million records!), child 3 (10000 + records)
(please forgive the alias).

Each record in the master has now more than one matching record in each table child (one to many).
Also there may be any record in any or all of the tables for a particular master record.

Now, I need to get the maximum of last_updated_date for each master record in each table 3 child and then find the maximum of
the three obtained last_active_dates from the 3 tables.
for example: Master ID 100, to interrogate Child1 for all Master ID 100 records and get the max last_updated_date.
Same for the other 2 tables and get the most out of these three values.
(I also need to deal with cases where no trace may be found in a child table to a Master ID)

Write a procedure that uses sliders that the value of each of the performance hits of child table
evil. And that's, I need to know the last_updated_date for each master file (all 150000 of them). It will probably take days to do this.

SELECT MAX (C1. LAST_UPDATED_DATE)
MAX (C2. LAST_UPDATED_DATE)
MAX (C3. LAST_UPDATED_DATE)
OF CHILD1 C1
CHILD2 C2
CHILD3 C3
WHERE C1. MASTER_ID = 100
OR C2. MASTER_ID = 100
OR C3. MASTER_ID = 100

I tried the above, but I got an error in tablespace temp. I don't think that the application is good enough at all.
(The GOLD clause is to take care of any records in a child table. If there is an AND, then the join and then select
No, not even if there is no record in a child table, but valid values in the other 2 tables).

Thank you very much.

Published by: user773489 on December 16, 2008 11:49

You want alias to this field then.

SELECT MAX (C.LAST_UPDATED_DATE)
FROM
(select child1_master_id MASTER_ID, field2, field3,... field4 from CHILD1 UNION ALL
 select child2_master_id MASTER_ID, field2, field3,... field4 from CHILD2 UNION ALL
 select child3_master_id MASTER_ID, field2, field3,... field4 from CHILD3) C
WHERE C.MASTER_ID = 100

If do you something like that, and explicitly list the columns you want.

Edit: for something like a specific query for a MASTER_ID...

SELECT MAX (C.LAST_UPDATED_DATE)
FROM
(select child1_master_id MASTER_ID, LAST_UPDATED_DATE from CHILD1 where child1_master_id = 100 UNION ALL
 select child2_master_id MASTER_ID, LAST_UPDATED_DATE from CHILD2 where child2_master_id = 100 UNION ALL
 select child3_master_id MASTER_ID, LAST_UPDATED_DATE from CHILD3 where child3_master_id = 100) C
WHERE C.MASTER_ID = 100

That should give you very good performance by raising a record. But a better idea, as indicated, would be to get it all at once with a sql:

SELECT MASTER_ID, MAX(C.LAST_UPDATED_DATE)
FROM
(select child1_master_id MASTER_ID, LAST_UPDATED_DATE from CHILD1 UNION ALL
 select child2_master_id MASTER_ID, LAST_UPDATED_DATE from CHILD2 UNION ALL
 select child3_master_id MASTER_ID, LAST_UPDATED_DATE from CHILD3 ) C
GROUP BY MASTER_ID

This will give you the max for each MASTER_ID in a sql without a cursor.

Published by: tk-7381344, December 16, 2008 12:12

Tags: Database

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