PFB一个sql查询我正在尝试运行。最终输出返回大约6万行，但运行大约需要5个小时。连接和类似的东西没有问题，我觉得我的查询需要大量优化。有人可以指出我正确的方向吗？
SELECT
rapidview.name AS RapidView,
CASE
WHEN linktype.LINKNAME ="jira_subtask_link"
THEN sprintdest.name
ELSE sprint.name
END AS Sprint,
j.pkey AS CaseKey,
-- Sub task arent assigned sprint details, they are directly pulled from parent task, so that
-- logic is implemented here for pulling all sprint related info
CASE
WHEN linktype.LINKNAME ="jira_subtask_link"
THEN FROM_UNIXTIME(sprintdest.start_date/1000)
ELSE FROM_UNIXTIME(sprint.start_date/1000)
END AS SprintStartDate,
CASE
WHEN linktype.LINKNAME ="jira_subtask_link"
THEN FROM_UNIXTIME(sprintdest.END_DATE/1000)
ELSE FROM_UNIXTIME(sprint.END_DATE/1000)
END AS SprintEndDate,
StoryPoints.numbervalue AS StoryPoint,
c.cname AS Component,
it.pname AS Type,
p.pname AS Project,
iss.pname AS Status,
dest.pkey AS linkedissue,
dest.id AS destid,
dest.created AS linkedissuecreated,
(cglinkedissue.created) AS LinkedIssueClosedDate,
linktype.LINKNAME AS LinkType,
cfoowner.customvalue AS Owner,
j.created AS Created,
cg.created AS ClosedDate,
CASE
WHEN linktype.LINKNAME ="jira_subtask_link"
THEN (
CASE
WHEN sprintdest.started=true
AND sprintdest.closed=false
THEN "Current Sprint"
WHEN sprintdest.started=true
AND sprintdest.closed=true
THEN "Completed Sprint"
WHEN sprintdest.started=false
AND sprintdest.closed=false
THEN "Future Sprint"
END)
ELSE (
CASE
WHEN sprint.started=true
AND sprint.closed=false
THEN "Current Sprint"
WHEN sprint.started=true
AND sprint.closed=true
THEN "Completed Sprint"
WHEN sprint.started=false
AND sprint.closed=false
THEN "Future Sprint"
END)
END AS SprintStatus,
j.TIMEORIGINALESTIMATE/3600 AS EstimatedTime,
j.TIMEESTIMATE/3600 AS RemainingTime,
j.TIMESPENT/3600 AS LoggedHours ,
cg.id AS CGID,
ci.groupid AS cigroupid,
ci.field AS CIFIELD,
ci.newstring AS NEWSTRING
-- DevLead.stringvalue as DevLead,
-- PMLead.stringvalue as PMLead,
-- QaLead.stringvalue as QALead,
-- DevLeadName.display_name as DevleadDisplayName,
-- PMLeadName.display_name as PMLeadDisplayName,
-- QALeadName.display_name as QALeadDisplayName
FROM
jiraissue j
LEFT JOIN
customfieldvalue cfv
ON
cfv.issue=j.id
AND cfv.customfield=11002
LEFT JOIN
AO_60DB71_SPRINT sprint
ON
sprint.id=cfv.stringvalue
LEFT JOIN
AO_60DB71_RAPIDVIEW rapidview
ON
sprint.RAPID_VIEW_ID=rapidview.id
LEFT JOIN
nodeassociation na
ON
j.id=na.source_node_id
AND na.association_type = ('IssueComponent')
LEFT JOIN
component c
ON
na.sink_node_id=c.id
LEFT JOIN
customfieldvalue StoryPoints
ON
j.id=StoryPoints.issue
AND StoryPoints.customfield=10572
/*
LEFT JOIN
customfieldvalue PMLead
ON
j.id=PMLead.issue
AND PMLead.customfield=10382
LEFT JOIN
customfieldvalue DevLead
ON
j.id=DevLead.issue
AND StoryPoints.customfield=10380
LEFT JOIN
customfieldvalue QaLead
ON
j.id=QaLead.issue
AND QaLead.customfield=10381
left join cwd_user DevLeadName
on DevLead.stringvalue=DevLeadName.user_name
left join cwd_user PMLeadName
on PMLead.stringvalue=PMLeadName.user_name
left join cwd_user QALeadName
on QaLead.stringvalue=QALeadName.user_name
*/
LEFT JOIN
issuetype it -- To pull in issuetype
ON
j.issuetype=it.id
LEFT JOIN
project p -- To pull in project
ON
j.project=p.id
LEFT JOIN
issuestatus iss -- To pull in Case Status
ON
j.issuestatus=iss.id
LEFT JOIN
issuelink il -- To identify linked cases
ON
j.id=il.destination
LEFT JOIN
issuelinktype linktype
ON
il.linktype=linktype.id
LEFT JOIN
jiraissue dest -- To idenfity component for the the linked case
ON
dest.id=il.source
LEFT JOIN
customfieldvalue owner -- To pull in customfields
ON
j.id=owner.issue
AND owner.customfield=10310
LEFT JOIN
customfieldoption cfoowner -- To pull in customfields
ON
cfoowner.id=owner.stringvalue
LEFT JOIN
changegroup cg -- To pull in case history to identify status changes
ON
j.id=cg.issueid
LEFT JOIN
changeitem ci
ON
cg.id=ci.groupid
AND ci.field='status'
AND ci.newstring LIKE '%Closed%'
LEFT JOIN
changegroup cglinkedissue -- To pull in case history to identify status changes
ON
dest.id=cglinkedissue.issueid
LEFT JOIN
changeitem cilinkedissue
ON
cilinkedissue.groupid=cglinkedissue.id
AND cilinkedissue.field='status'
AND cilinkedissue.newstring LIKE '%Closed%'
LEFT JOIN
customfieldvalue cfvdest
ON
cfvdest.issue=dest.id
AND cfvdest.customfield=11002
LEFT JOIN
AO_60DB71_SPRINT sprintdest
ON
sprintdest.id=cfvdest.stringvalue
-- year( FROM_UNIXTIME(sprint.END_DATE/1000) /1000)>=2015
-- or year( FROM_UNIXTIME(sprintdest.END_DATE/1000) /1000)>=2015
-- where
-- j.pkey='CLQ-41441'
group by
j.id,
c.id,il.id,sprint.id
执行计划
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE j ALL (null) (null) (null) (null) 891945 (null)
1 SIMPLE cfv ref cfvalue_issue cfvalue_issue 18 jira_rnd_p.j.ID,const 1 (null)
1 SIMPLE sprint eq_ref PRIMARY PRIMARY 8 jira_rnd_p.cfv.STRINGVALUE 1 Using where
1 SIMPLE rapidview eq_ref PRIMARY PRIMARY 8 jira_rnd_p.sprint.RAPID_VIEW_ID 1 (null)
1 SIMPLE na ref PRIMARY,node_source PRIMARY 8 jira_rnd_p.j.ID 1 Using where; Using index
1 SIMPLE c eq_ref PRIMARY PRIMARY 8 jira_rnd_p.na.SINK_NODE_ID 1 (null)
1 SIMPLE StoryPoints ref cfvalue_issue cfvalue_issue 18 jira_rnd_p.j.ID,const 1 (null)
1 SIMPLE it eq_ref PRIMARY PRIMARY 182 jira_rnd_p.j.issuetype 1 Using where
1 SIMPLE p eq_ref PRIMARY PRIMARY 8 jira_rnd_p.j.PROJECT 1 (null)
1 SIMPLE iss eq_ref PRIMARY PRIMARY 182 jira_rnd_p.j.issuestatus 1 Using where
1 SIMPLE il ref issuelink_dest issuelink_dest 9 jira_rnd_p.j.ID 1 (null)
1 SIMPLE linktype eq_ref PRIMARY PRIMARY 8 jira_rnd_p.il.LINKTYPE 1 (null)
1 SIMPLE dest eq_ref PRIMARY PRIMARY 8 jira_rnd_p.il.SOURCE 1 (null)
1 SIMPLE owner ref cfvalue_issue cfvalue_issue 18 jira_rnd_p.j.ID,const 1 (null)
1 SIMPLE cfoowner eq_ref PRIMARY PRIMARY 8 jira_rnd_p.owner.STRINGVALUE 1 Using where
1 SIMPLE cg ref chggroup_issue chggroup_issue 9 jira_rnd_p.j.ID 4 (null)
1 SIMPLE ci ref chgitem_chggrp,chgitem_field chgitem_chggrp 9 jira_rnd_p.cg.ID 1 Using where
1 SIMPLE cglinkedissue ref chggroup_issue chggroup_issue 9 jira_rnd_p.dest.ID 4 (null)
1 SIMPLE cilinkedissue ref chgitem_chggrp,chgitem_field chgitem_chggrp 9 jira_rnd_p.cglinkedissue.ID 1 Using where
1 SIMPLE cfvdest ref cfvalue_issue cfvalue_issue 18 jira_rnd_p.dest.ID,const 1 (null)
1 SIMPLE sprintdest eq_ref PRIMARY PRIMARY 8 jira_rnd_p.cfvdest.STRINGVALUE 1 Using where
答案 0 :(得分：0)
尝试EXPLAIN。
注意possible_keys，key，rows。
也许您可以发布EXPLAIN结果，我们可以看到该怎么做。
答案 1 :(得分：0)
您需要LEFT吗？也就是说，所有其他表都是可选的吗？
如果您在某些情况下可以摆脱LEFT，则可以避免扫描j的所有891K行。
你是否只对＆＃34;关闭＆＃34;感兴趣？项目？如果是这样，则查询不会将其自身限制在它们之外，这也是因为LEFT。
首先，我会在实际情况下删除LEFT。然后将AND中不属于JOIN的{{1}}子句移到最后的WHERE。这可能允许查询更快地过滤内容，而不是在到达NULLs之前拖拽891K（或更多）行（包括大量GROUP BY）。