Performance with ORDER BY + AND in sqlite

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Performance with ORDER BY + AND in sqlite

Author

Topic

FredFoobar
Starting Member

1 Post

Posted - 2011-11-05 : 10:46:10

I'm experiencing some weird behavior with SELECT statements in sqlite. There is one table with 3 Million records. E.g.

    SELECT * FROM table1 WHERE cond1;

reduces the output to 10000 records and finishes instantly. Same with

    SELECT * FROM table1 WHERE cond1 ORDER BY col1;

and

    SELECT * FROM table1 WHERE cond1 AND cond2

BUT:

    SELECT * FROM table1 WHERE cond1 AND cond2 ORDER BY col1;

seems to take forever. The CPU is working for about 2 seconds and after that there is only I/O. CPU does nothing, memory is free.

What am I doing wrong? Thx for help!

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2011-11-05 : 13:02:55

can you analyse execution plans in three cases and find out costly step in third case?

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

GilaMonster
Master Smack Fu Yak Hacker

4507 Posts

Posted - 2011-11-05 : 14:40:59

SQLite? As in the database library for .net? Or a client for MS SQL Server?

--
Gail Shaw
SQL Server MVP

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