我在运行此查询时遇到问题。在我的个人计算机上，我已将MySQL升级到5.7以进行更好的日志记录，此查询工作正常。当我在5.5上投入生产时，它可以工作，但有时只是。
在生产中使用HeidiSQL（i7 3.4GHz - 16GB ram）它可以运行但需要50秒才能运行，但在我的双6核64GB内存上，使用相同的数据在我的PC上只需2.6秒。使用我的C＃应用程序，我收到错误＆＃34;命令执行期间遇到致命错误＆＃34;。知道这两种情况有什么不同吗？它会在一种情况下起作用而在另一种情况下不起作用吗？执行时间是否与它有关？
我正在为其他20个查询使用相同的c＃查询执行方法，这些查询都运行得很好，但由于某种原因，这个问题很难解决。
查询：
SELECT p.patnum AS reference_id,
p.guarantor AS guarantor_reference_id,
p.bal_0_30 AS balance_0_30,
p.bal_31_60 AS balance_31_60,
p.bal_61_90 AS balance_61_90,
p.balover90 AS balance_over_90,
p.baltotal AS account_balance,
pending_writeoff,
claims_estimated_amount,
patient_portion_due AS amount_due_from_patient,
Sum(procfee) AS lifetime_value
FROM patient AS p
LEFT JOIN (SELECT patient.patnum,
patient.guarantor,
patient.bal_0_30,
patient.bal_31_60,
patient.bal_61_90,
patient.balover90,
guarAging.baltotal,
guarAging.inswoest
AS
pending_writeoff,
guarAging.inspayest
AS
claims_estimated_amount,
guarAging.baltotal - guarAging.inspayest -
guarAging.inswoest
AS
patient_portion_due
FROM (SELECT tSums.patnum,
Round(CASE
WHEN tSums.totalcredits >=
tSums.chargesover90
THEN 0
ELSE tSums.chargesover90 -
tSums.totalcredits
end, 2) Balover90,
Round(CASE
WHEN tSums.totalcredits <=
tSums.chargesover90
THEN
tSums.charges_61_90
WHEN tSums.chargesover90 +
tSums.charges_61_90
<=
tSums.totalcredits
THEN 0
ELSE tSums.chargesover90 +
tSums.charges_61_90
-
tSums.totalcredits
end, 2) Bal_61_90,
Round(CASE
WHEN tSums.totalcredits <
tSums.chargesover90 +
tSums.charges_61_90 THEN
tSums.charges_31_60
WHEN tSums.chargesover90 +
tSums.charges_61_90
+ tSums.charges_31_60 <=
tSums.totalcredits THEN 0
ELSE tSums.chargesover90 +
tSums.charges_61_90
+ tSums.charges_31_60 -
tSums.totalcredits
end, 2) Bal_31_60,
Round(CASE
WHEN tSums.totalcredits <
tSums.chargesover90 +
tSums.charges_61_90
+ tSums.charges_31_60 THEN
tSums.charges_0_30
WHEN tSums.chargesover90 +
tSums.charges_61_90
+ tSums.charges_31_60 +
tSums.charges_0_30 <=
tSums.totalcredits
THEN 0
ELSE tSums.chargesover90 +
tSums.charges_61_90
+ tSums.charges_31_60 +
tSums.charges_0_30 -
tSums.totalcredits
end, 2) Bal_0_30,
Round(tSums.baltotal, 2) BalTotal,
Round(tSums.inswoest, 2) InsWoEst,
Round(tSums.inspayest, 2) InsPayEst,
Round(tSums.payplandue, 2) PayPlanDue
FROM (SELECT p.guarantor PatNum,
Sum(CASE
WHEN trans.tranamount > 0
AND trans.trandate <
'2018-01-11'
THEN
trans.tranamount
ELSE 0
end) ChargesOver90,
Sum(CASE
WHEN trans.tranamount > 0
AND trans.trandate <
'2018-01-12'
AND trans.trandate >=
'2018-02-10'
THEN
trans.tranamount
ELSE 0
end) Charges_61_90,
Sum(CASE
WHEN trans.tranamount > 0
AND trans.trandate <
'2018-02-11'
AND trans.trandate >=
'2018-03-12'
THEN
trans.tranamount
ELSE 0
end) Charges_31_60,
Sum(CASE
WHEN trans.tranamount > 0
AND trans.trandate <=
'2018-03-13'
AND trans.trandate >=
'2018-04-12'
THEN
trans.tranamount
ELSE 0
end) Charges_0_30,
-Sum(CASE
WHEN trans.tranamount < 0
AND trans.trandate <=
'2018-04-12'
THEN
trans.tranamount
ELSE 0
end) TotalCredits,
Sum(CASE
WHEN trans.tranamount != 0 THEN
trans.tranamount
ELSE 0
end) BalTotal,
Sum(trans.inswoest) InsWoEst,
Sum(trans.inspayest) InsPayEst,
Sum(trans.payplanamount) PayPlanDue
FROM (SELECT 'Proc'
TranType,
pl.patnum,
pl.procdate
TranDate,
pl.procfee * (
pl.unitqty + pl.baseunits )
TranAmount,
0
PayPlanAmount
,
0
InsWoEst,
0
InsPayEst
FROM procedurelog pl
WHERE pl.procstatus = 2
AND pl.procfee != 0
UNION ALL
SELECT 'Claimproc' TranType,
cp.patnum,
cp.datecp TranDate,
( CASE
WHEN cp. status != 0 THEN
( CASE
WHEN cp.payplannum = 0 THEN
-
cp.inspayamt
ELSE 0
end )
-
cp.writeoff
ELSE 0
end ) TranAmount,
( CASE
WHEN cp.payplannum != 0
AND cp. status IN ( 1,
4, 5 )
THEN -
cp.inspayamt
ELSE 0
end ) PayPlanAmount,
( CASE
WHEN cp. status = 0 THEN
cp.writeoff
ELSE 0
end ) InsWoEst,
( CASE
WHEN cp. status = 0 THEN
cp.inspayest
ELSE 0
end ) InsPayEst
FROM claimproc cp
WHERE cp. status IN ( 0, 1, 4, 5, 7 )
HAVING tranamount != 0
OR payplanamount != 0
OR inswoest != 0
OR inspayest != 0
UNION ALL
SELECT 'Adj' TranType,
a.patnum,
a.adjdate TranDate,
a.adjamt TranAmount,
0 PayPlanAmount,
0 InsWoEst,
0 InsPayEst
FROM adjustment a
WHERE a.adjamt != 0
UNION ALL
SELECT 'PatPay' TranType,
ps.patnum,
ps.datepay TranDate,
( CASE
WHEN ps.payplannum = 0 THEN
-
ps.splitamt
ELSE 0
end ) TranAmount,
( CASE
WHEN ps.payplannum != 0
THEN -
ps.splitamt
ELSE 0
end ) PayPlanAmount,
0 InsWoEst,
0 InsPayEst
FROM paysplit ps
WHERE ps.splitamt != 0
UNION ALL
SELECT 'PPCharge'
TranType,
ppc.guarantor
PatNum,
ppc.chargedate
TranDate,
0
TranAmount,
Coalesce (ppc.principal +
ppc.interest, 0)
PayPlanAmount
,
0
InsWoEst,
0
InsPayEst
FROM payplancharge ppc
WHERE ppc.chargedate <= '2018-04-22'
AND ppc.chargetype = 0
AND Coalesce (ppc.principal +
ppc.interest, 0)
!= 0
UNION ALL
SELECT 'PPComplete' TranType,
pp.patnum,
pp.payplandate TranDate,
-pp.completedamt TranAmount,
0 PayPlanAmount,
0 InsWoEst,
0 InsPayEst
FROM payplan pp
WHERE pp.completedamt != 0) trans
RIGHT JOIN patient p
ON p.patnum = trans.patnum
GROUP BY p.guarantor
ORDER BY NULL) tSums) guarAging
INNER JOIN patient
ON patient.patnum = guarAging.patnum
LEFT JOIN (SELECT patnum,
claimstatus,
claimfee,
inspayest,
writeoff
FROM claim) AS c
ON c.patnum = patient.patnum
GROUP BY patient.patnum) AS results
ON results.patnum = p.patnum
LEFT JOIN procedurelog AS plog
ON plog.patnum = p.patnum
AND plog.procstatus = 2
GROUP BY p.patnum
C＃执行：
try
{
using (var mySqlConnection = new MySqlConnection(connBuilder.ConnectionString))
{
mySqlConnection.Open();
using (var cmd = new MySqlCommand(strQuery, mySqlConnection))
{
using (var reader = cmd.ExecuteReader()) <= FAILS HERE
{
对于它的价值，有一次我确实看到了错误＆＃34;数据读取期间的致命错误＆＃34;并添加了这个，但另一个错误仍在发生：
MySqlCommand timeoutAdjust = new MySqlCommand("set net_write_timeout=99999; set net_read_timeout=99999", mySqlConnection); // Setting tiimeout on mysqlServer
timeoutAdjust.ExecuteNonQuery();