Slow ORDER BY with large and small tables
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I have one small table (200 rows) and two large tables (200k rows each).
Small table has primary key id and some other fields.
First big table has id field (not a primary key), which are duplicated, but sorted numbers and a matchresult_id field, which are id's from a second big table.
Second big table has a field matchresult_id (primary key) and some other fields.
The query:
SELECT big2.*
FROM small_table s1
INNER JOIN small_table s2 ON s1.id = s2.parent_id
INNER JOIN big_table1 big1 ON s2.id = big1.id
INNER JOIN big_table2 big2 ON big1.matchresult_id = big2.matchresult_id
ORDER BY big2.matchresult_id
The query takes over 1 second to complete. Without ORDER BY it takes 0.003 seconds. How to optimize the query?
mysql optimization
asked 3 mins ago
osemecosemec
1
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I have one small table (200 rows) and two large tables (200k rows each).
Small table has primary key id and some other fields.
First big table has id field (not a primary key), which are duplicated, but sorted numbers and a matchresult_id field, which are id's from a second big table.
Second big table has a field matchresult_id (primary key) and some other fields.
The query:
SELECT big2.*
FROM small_table s1
INNER JOIN small_table s2 ON s1.id = s2.parent_id
INNER JOIN big_table1 big1 ON s2.id = big1.id
INNER JOIN big_table2 big2 ON big1.matchresult_id = big2.matchresult_id
ORDER BY big2.matchresult_id
The query takes over 1 second to complete. Without ORDER BY it takes 0.003 seconds. How to optimize the query?
mysql optimization
asked 3 mins ago
osemecosemec
1
New contributor
osemec is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I have one small table (200 rows) and two large tables (200k rows each).
Small table has primary key id and some other fields.
First big table has id field (not a primary key), which are duplicated, but sorted numbers and a matchresult_id field, which are id's from a second big table.
Second big table has a field matchresult_id (primary key) and some other fields.
The query:
SELECT big2.*
FROM small_table s1
INNER JOIN small_table s2 ON s1.id = s2.parent_id
INNER JOIN big_table1 big1 ON s2.id = big1.id
INNER JOIN big_table2 big2 ON big1.matchresult_id = big2.matchresult_id
ORDER BY big2.matchresult_id
The query takes over 1 second to complete. Without ORDER BY it takes 0.003 seconds. How to optimize the query?
mysql optimization
asked 3 mins ago
osemecosemec
1
New contributor
osemec is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have one small table (200 rows) and two large tables (200k rows each).
Small table has primary key id and some other fields.
First big table has id field (not a primary key), which are duplicated, but sorted numbers and a matchresult_id field, which are id's from a second big table.
Second big table has a field matchresult_id (primary key) and some other fields.
The query:
SELECT big2.*
FROM small_table s1
INNER JOIN small_table s2 ON s1.id = s2.parent_id
INNER JOIN big_table1 big1 ON s2.id = big1.id
INNER JOIN big_table2 big2 ON big1.matchresult_id = big2.matchresult_id
ORDER BY big2.matchresult_id
The query takes over 1 second to complete. Without ORDER BY it takes 0.003 seconds. How to optimize the query?
mysql optimization
mysql optimization
asked 3 mins ago
osemecosemec
1
New contributor
osemec is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 mins ago
osemecosemec
1
New contributor
osemec is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 mins ago
osemecosemec
1
New contributor
osemec is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 mins ago
osemecosemec
1
asked 3 mins ago
osemecosemec
1
1
New contributor
osemec is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
osemec is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
osemec is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
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