mysql group by on table from two derived non-indexable
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Working with mysql 5.7. I've got a query that ends up joining two derived tables and grouping on one of the columns. The query without the grouping runs pretty fast.... .5 seconds and returns 15K rows (In production I would expect that to possibly hit 100K + rows). When I do a group on this query it really kills the performance resulting in a query that takes 10x longer. I have tried to reorganize the query to push the group by logic to an earlier step; logically that doesn't work. I've also tried creating a temp table to insert the query's results that takes .5 seconds to run but the inserting into the temp table takes ~5 seconds (and I'm assuming that exactly what is happening with the original query given what the explain says). I've also tried modifying the session setting for the join and sort buffers but that doesn't seem to change anything at all. Does anybody have any advice on what else I could try or what I have tried that I haven't tried "correctly". Do I need to do something else besides
SET SESSION sort_buffer_size = 1024*1024*4;
SET SESSION join_buffer_size = 1024*1024*4;
to get those conf settings to work cause they don't seem to do anything at all to my query performance. I've adjust those values all over the place from 1024*4 to 1024*1024*10
Also, I'm a bit miffed as to why it takes ~5 seconds to add 15K rows to a temp table. I've tried memory engine, adding indexes etc... always takes ~5 seconds.
Here is a very simple boiled down version of the query that may help get the gist of what I'm doing
select group_concat(storeID), fileID
from ( select ugfileToStores.storeID, ugfileToStores.fileID
from ( select usergroupID, storeID from tableOne
join ( select fileID, storeID from tableTwo ) tableTwo
on tableOne.storeID = tableTwo.storeID ) ugfileToStores
) fileToStores
group by fileID
Without the group by at the end and the group_concat the query runs in ~.5 seconds... with it it runs in ~5 seconds.
Here is an example of the actual query:
SELECT sql_no_cache group_concat(usergroup0.storeid),
filebucket0.filebucketid
FROM (
SELECT en.id AS usergroupid,
st.storeid AS storeid,
1 AS assignmentcount
FROM entity en
CROSS JOIN
(
SELECT storeid
FROM masterentity_attachedstores
WHERE masterentityid = 156825) st
WHERE en.id IN ('156830') ) usergroup0
INNER JOIN
(
SELECT maxout.filebucketid,
maxout.storeid
FROM (
SELECT filebucketid,
storeid,
entityid
FROM (
SELECT stb.id AS filebucketid,
AS.storeid AS storeid,
1 AS assignmentcount
FROM masterentity_attachedstores AS
JOIN entity en
ON AS.storeid = en.id
JOIN filebucket AS stb
WHERE en.isdeleted = 0
AND AS.masterentityid = 156825
AND stb.id IN (55,40)
UNION ALL
SELECT stb.id AS filebucketid,
stb_ret_s.id AS storeid,
count(stb_ret_a.id) AS assignmentcount
FROM assignment AS stb_ret_a
JOIN filebucket AS stb
ON stb.id = stb_ret_a.associatedobjectid
AND stb.id IN (69,50,68)
INNER JOIN entity AS stb_ret_e
ON stb_ret_e.id = stb_ret_a.assignmentvalue
AND stb_ret_e.classname = 'Retailer'
AND stb_ret_a.assignmentsubtype IN ('RetailerID')
JOIN store stb_ret_s
ON stb_ret_s.retailerid = stb_ret_e.id
WHERE stb_ret_a.associatedobjectclass = 'FileBucket'
AND stb_ret_a.isdeleted = 0
AND stb_ret_a.assignmentsubtype IN ('RetailerID')
AND stb_ret_e.isdeleted = 0
GROUP BY filebucketid,
storeid
UNION ALL
SELECT filebucket.id AS filebucketid,
stb.storeid AS storeid,
1 AS assignmentcount
FROM filebucket
CROSS JOIN
(
SELECT maxout.repid,
maxout.storeid
FROM (
SELECT repid,
storeid,
entityid
FROM (
SELECT mp.id AS repid,
mp_cf_csv.entityid AS storeid,
count(mp_cf_a.id) AS assignmentcount
FROM assignment AS mp_cf_a
JOIN rep AS mp
ON mp.id = mp_cf_a.associatedobjectid
JOIN
customfieldvalue AS mp_cf_csv
ON mp_cf_csv.value = REPLACE(REPLACE(substring_index(substring_index(mp_cf_a.assignmentvalue, ',"', -1), ':', -1), '"',''), '}','')
AND mp_cf_csv.customfieldid = REPLACE(substring_index(substring_index(mp_cf_a.assignmentvalue, ',', 1), ':', -1), '"','')
JOIN entity AS mp_cf_e
ON mp_cf_e.id = mp_cf_csv.entityid
WHERE mp_cf_a.associatedobjectid IN (7400,7825,7780,7700)
AND mp_cf_a.associatedobjectclass = 'Rep'
AND mp_cf_a.isdeleted = 0
AND mp_cf_a.assignmentsubtype IN ('CustomFieldValue')
AND mp_cf_e.isdeleted = 0
GROUP BY repid,
storeid
UNION ALL
SELECT mp.id AS repid,
mp_ret_s.id AS storeid,
count(mp_ret_a.id) AS assignmentcount
FROM assignment AS mp_ret_a
JOIN rep AS mp
ON mp.id = mp_ret_a.associatedobjectid
JOIN store AS mp_ret_s
ON mp_ret_s.retailerid = mp_ret_a.assignmentvalue
AND mp_ret_a.assignmentsubtype IN ('RetailerID')
JOIN entity AS mp_ret_e
ON mp_ret_e.id = mp_ret_s.id
WHERE mp_ret_a.associatedobjectid IN (7700,7400,7780,7825)
AND mp_ret_a.associatedobjectclass = 'Rep'
AND mp_ret_a.isdeleted = 0
AND mp_ret_a.assignmentsubtype IN ('RetailerID')
AND mp_ret_e.isdeleted = 0
GROUP BY repid,
storeid) orouttie
JOIN masterentity_attachedstores AS
ON orouttie.storeid = AS.storeid
AND AS.masterentityid = 156825
JOIN
(
SELECT associatedobjectid,
ownerobjectid
FROM assignment
WHERE associatedobjectid IN (7400,7700,7780,7825)
AND associatedobjectclass='Rep'
GROUP BY associatedobjectid) creatorassignment
ON creatorassignment.associatedobjectid = orouttie.repid
JOIN entityuser creatorentity
ON creatorentity.id = creatorassignment.ownerobjectid ) maxout
JOIN asshelper0660552001475295480164_out outcreator
ON maxout.storeid = outcreator.storeid
AND outcreator.usergroupid = maxout.entityid ) stb
WHERE id IN (60,55,50)
UNION ALL
SELECT stb.id AS filebucketid,
AS.storeid AS storeid,
1 AS assignmentcount
FROM masterentity_attachedstores AS
JOIN entity en
ON AS.storeid = en.id
JOIN filebucket AS stb
WHERE en.isdeleted = 0
AND AS.masterentityid = 156825
AND stb.id IN (40)) orouttie
JOIN masterentity_attachedstores AS
ON orouttie.storeid = AS.storeid
AND AS.masterentityid = 156825
JOIN
(
SELECT associatedobjectid,
ownerobjectid
FROM assignment
WHERE associatedobjectid IN (40,50,55,60,65,67,68,69)
AND associatedobjectclass='FileBucket'
GROUP BY associatedobjectid) creatorassignment
ON creatorassignment.associatedobjectid = orouttie.filebucketid
JOIN entityuser creatorentity
ON creatorentity.id = creatorassignment.ownerobjectid ) maxout
JOIN asshelper0777657001475295479813_out outcreator
ON maxout.storeid = outcreator.storeid
AND outcreator.usergroupid = maxout.entityid ) filebucket0
ON filebucket0.storeid = usergroup0.storeid
GROUP BY filebucket0.filebucketid
Asked by Josh
(159 rep)
Oct 1, 2016, 04:05 PM
Last activity: Jun 22, 2025, 11:08 AM
Last activity: Jun 22, 2025, 11:08 AM