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SQL code block running v.v.v. slow [message #173417]

Mon, 22 May 2006 06:56

blazingrock4u
Messages: 30
Registered: March 2006
Location: India

Member

select T1.col11,
T1.col12 ,
T2.col21,
T3.col31,
T3.col32,
from table2 T2,
table3 T3,
table1 T1
where T2.col21 = T3.col33
and
T1.col13 = T2.col23

no indexes on Table1, Table3.

Table1=1lac rows
Table2=58lac rows
Table3=58 lac rows

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Re: SQL running v.v.v.slow [message #173421 is a reply to message #173417]

Mon, 22 May 2006 07:32

BlackSwan
Messages: 26766
Registered: January 2009
Location: SoCal

Senior Member

The results set is a carestian join against Table1; since is not included in the WHERE clause

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Re: SQL code block running v.v.v.slow [message #173433 is a reply to message #173417]

Mon, 22 May 2006 07:56

Frank Naude
Messages: 4590
Registered: April 1998

Senior Member

Creating some indexes on the join predicates will most certainly help.

BTW: What is "lac"?

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Re: SQL code block running v.v.v.slow [message #173441 is a reply to message #173433]

Mon, 22 May 2006 08:09

Art Metzer
Messages: 2480
Registered: December 2002

Senior Member

Lac, also spelled "lakh", is a measurement equivalent to a hundred thousand (1E5). The term is most commonly used in India.

Here's a Wikipedia article on the subject ("Indian numbering system").

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