有人可以帮我优化下面的 mysql 存储过程，它使我的服务器崩溃

Question

/* Below will fetch all completed task.*/

insert ignore into NodeInstanceLog_Dump
select  nil.id, nil.connection, nil.log_date, nil.externalId,
nil.nodeContainerId, nil.nodeId ,nil.nodeInstanceId,
coalesce(nil.nodename, nil3.name)nodename, nil.nodeType, nil.processId,
nil.processInstanceId , nil.referenceId, nil.slaCompliance, nil.sla_due_date,
        nil.type, nil.workItemId, 0 as activeStatus
    from  bpm.NodeInstanceLog nil
    inner join  bpm.VariableInstanceLog vil
             ON nil.processInstanceId=vil.processInstanceId
      and  vil.value='Success'
      and  vil.variableId in ('oltOrderStatus','orderStatus')
      and  nodeType='EndNode'
      and  type=0
    left join  
    (
        SELECT  distinct nil2.*,nil1.nodeName name
            from  bpm.NodeInstanceLog nil1 inner join
            (
                SELECT  max(convert(nodeinstanceid,signed))id,processInstanceId
                    from  bpm.NodeInstanceLog
                    where  nodetype='HumanTaskNode'group by processInstanceId
            )nil2  ON nil1.nodeinstanceid=nil2.id
              and  nil1.processInstanceId=nil2.processInstanceId
    )nil3  ON nil.processInstanceId=nil3.processInstanceId;

/* Below will fetch all aborted task.*/

insert ignore into NodeInstanceLog_Dump
select  nil.id, nil.connection, nil.log_date, nil.externalId,
nil.nodeContainerId, nil.nodeId ,nil.nodeInstanceId,
coalesce(nil.nodename, nil3.name)nodename, nil.nodeType, nil.processId,
nil.processInstanceId , nil.referenceId, nil.slaCompliance, nil.sla_due_date,
        nil.type, nil.workItemId, 0 as activeStatus
    from  bpm.NodeInstanceLog nil
    inner join  bpm.VariableInstanceLog vil
             ON nil.processInstanceId=vil.processInstanceId
      and  vil.value='Aborted'
      and  vil.variableId in ('oltOrderStatus','orderStatus')
      and  nodeType='EndNode'
      and  type=0
    left join  
    (
        SELECT  distinct nil2.*,nil1.nodeName name
            from  bpm.NodeInstanceLog nil1 inner join
            (
                SELECT  max(convert(nodeinstanceid,signed))id,processInstanceId
                    from  bpm.NodeInstanceLog
                    where  nodetype='HumanTaskNode'group by processInstanceId
            )nil2  ON nil1.nodeinstanceid=nil2.id
              and  nil1.processInstanceId=nil2.processInstanceId
    )nil3  ON nil.processInstanceId=nil3.processInstanceId;

Answer 1

Some of these indexes may help:

NodeInstanceLog:  INDEX(processInstanceId)
NodeInstanceLog:  INDEX(nodeinstanceid,  nodeName, processInstanceId)
VariableInstanceLog:  INDEX(processInstanceId,  value, variableId)

When adding a composite index, DROP index(es) with the same leading columns. That is, when you have both INDEX(a) and INDEX(a,b), toss the former.

max(convert(nodeinstanceid,signed)) -- Does this mean that nodeinstanceid is a VARCHAR , but needs to be compare as a number? I recommend you find a way to store it in an INT or other type of numeric column; this may allow the query to run much faster. Also, is that column in NodeInstanceLog ? Is it the PRIMARY KEY ? What indexes (including the PK) exists now for the tables?

To help readers understand the query, please use ON for specifying how the tables relate, use WHERE for filtering.

Please qualify all columns with their table alias -- I can't tell, for example, which table type and nodeType are in. Hence, the INDEX recommendations above may not be complete.