Consider removing the disconnected table

Hi people

I'm a frustrating tuning suggestion which I did not MFIS because all the tables, I see links correctly.

Im trying to make a match and the code when it is called dynamic runs very slowly, but if I put it in a spreadsheet run in seconds

H2. The suggestion that I receive, code is below, thanks in advance...

1-restructuring conclusion of SQL (see map 1 to explain the plans section)
----------------------------------------------------------------
A Cartesian product costly operation were found in line 5 of the ID of the
execution plan.

Recommendation
--------------
-Plan to delete the offline table or a view of this statement or
Add a join condition that refers to it.

Raison d'etre
---------
A Cartesian product should be avoided as much as possible because it is a
expensive operation and can produce a large amount of data.


H1. Code


Select distinct b1.coname, b2.coname, b1.st_country, b2.st_country, b1. ST_COID, b2. ST_COID, 'fiic_500' of
boss_universe_matching b1,
boss_universe_matching b2,
boss_company_matching bc1,
boss_company_matching bc2
where
Lower (B1.source) = "fiic_500" and
Lower (B2.source) = "panasonic" and
B1.tr_coid = bc1.u_id and
B2.tr_coid = bc2.u_id and
BC1.root = bc2.root and
BC1. Country = bc2.country and
B1.st_coid not in (select source_coid from the company_matches where source = 'fiic_500') and ((bc1.activity = bc2.activity) or)
(INSTR (bc1.activity, bc2.activity) > 0
GOLD INSTR (bc2.activity, bc1.activity) > 0)) and (bc1.entity is not null and bc2.entity is null) and ((bc1.location = bc2.location) or)
(INSTR (bc1.location, bc2.location) > 0
INSTR or (bc2.location, bc1.location) > 0))

user8788094 wrote:
I'm sorry, it's better?

Much better {noformat} :-) {noformat}.

The optimizer seems to think that there will be only one line coming out of the operation of loop nested line 5, so not a Cartesian joinwith (single) line coming out of the kind of scan and full buffer in lines 9 and 8. A Cartesian join of two single row result sets is quite reasonable. The only question is, is the correct optimizer?

In fact, the query returns a single line? Estimates of the number of lines coming out of each stage seem reasonable to you? For example, combining the predicate with the plan section, the optimizer seems to think that a complete analysis of the filling of the BOSS_UNIVERSE_MATCHING is only one line where LOWER (SOURCE) = "panasonic". Is this reasonable?

John

Tags: Database

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