OPtimize the performance of a query

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От hmidi slim
Тема OPtimize the performance of a query
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Msg-id CAMsqVxsNsGJETtBZG=eLgFahGyv4zXaQdgGE0KfgBM+_5pWDww@mail.gmail.com
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Ответы Re: OPtimize the performance of a query
Re: OPtimize the performance of a query
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Hi,
I have two tables in the same database: geoname and test_table.
The geoname table contains many columns which are: name, feature_class, feature_code, admin1, admin2,admin3, name and so on.
The second table 'test_table' contains only the columns: city, state.
There is no join between the two tables and I want to make a match between the data contained in each of them because I need the result for a farther process.
I wrote this query:
select g.name, t.city
from geoname as g, test_table as t
where (lower(g.feature_class) like 'P' or lower(g.feature_class) like 'L')
and lower(g.country_code) like 'US'
and lower(g.admin1) like lower(t.state)
and (lower(g.name) like lower(t.city) or lower(g.name) like lower(t.city || 'city'))


The table geoname contains 370260 rows and the table test_table contains 10270 rows.
The query took a long time to accomplish more than half an hour.Should I add another column in the table test_table which contains the country_code and make an inner join with the geoname table or should I use indexs to accelerate the process?

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