我在 Django 中对远程 Oracle 服务器运行原始 SQL 查询。查询很长，需要一分半钟才能完成，但如果我使用 Oracle SQL Server 程序执行相同的查询，查询运行时间不到一秒。
为什么性能差别这么大？如何在 Django 中加快查询速度？
顺便说一句，我正在使用 Django 的开发服务器和配置文件工具栏（Django 1.5）。
更新：这是 Django 中的查询
holidays_filter = ''
if filters['holidays'] == 'exclude':
holidays_filter = 'AND FECHAS.FESTIVO = 0'
hp_inner_join = ''
if filters['hour-mode'] == 'hp-sector-ps':
hp_inner_join = """
INNER JOIN
EGW.RHP_CELLSEC_PS HPCELLPS
ON UCELL2.DIA = HPCELLPS.DIA
AND UCELL2.HORA = HPCELLPS.HORA
AND UCELL2.RNC = HPCELLPS.RNC
AND UCELL2.UTRANCELL = HPCELLPS.CELLID
"""
elif filters['hour-mode'] == 'hp-rnc-ps':
hp_inner_join = """
INNER JOIN
EGW.RHP_RNC_PS HPRNCPS
ON UCELL2.DIA = HPRNCPS.DIA
AND UCELL2.HORA = HPRNCPS.HORA
AND UCELL2.RNC = HPRNCPS.RNC
"""
sql = """
SELECT CUSTOM.DIA, CUSTOM.HORA,
ROUND(CUSTOM.TRAF_CS57 + CUSTOM.TRAF_CS64 + CUSTOM.TRAF_CS12 + CUSTOM.TRAF_CSAMR12200 + CUSTOM.TRAF_CSAMR7950 + CUSTOM.TRAF_CSAMR5900 + CUSTOM.TRAF_CSAMR4750, 1) AS TRAFICO_CS_ERL,
ROUND(CUSTOM.A + CUSTOM.B + CUSTOM.C + CUSTOM.D, 1) AS TRAFICO_PS_ERL
FROM (SELECT TOTAL.DIA, TOTAL.HORA, TOTAL.RNC, TOTAL.UTRANCELL,
CASE
WHEN TOTAL.PMSAMPLESCS12RABESTABLISH = 0
THEN 0
ELSE TOTAL.PMSUMCS12RABESTABLISH / TOTAL.PMSAMPLESCS12RABESTABLISH
END AS TRAF_CS12,
CASE
WHEN TOTAL.PMSAMPLESBESTCS57RABESTABLISH = 0
THEN 0
ELSE TOTAL.PMSUMBESTCS57RABESTABLISH / TOTAL.PMSAMPLESBESTCS57RABESTABLISH
END AS TRAF_CS57,
CASE
WHEN TOTAL.PMSAMPLESBESTCS64RABESTABLISH = 0
THEN 0
ELSE TOTAL.PMSUMBESTCS64RABESTABLISH / TOTAL.PMSAMPLESBESTCS64RABESTABLISH
END AS TRAF_CS64,
CASE
WHEN TOTAL.PMSAMPLBESTAMR12200RABESTABLIS = 0
THEN 0
ELSE TOTAL.PMSUMBESTAMR12200RABESTABLISH / TOTAL.PMSAMPLBESTAMR12200RABESTABLIS
END AS TRAF_CSAMR12200,
CASE
WHEN TOTAL.PMSAMPLBESTAMR7950RABESTABLISH = 0
THEN 0
ELSE TOTAL.PMSUMBESTAMR7950RABESTABLISH / TOTAL.PMSAMPLBESTAMR7950RABESTABLISH
END AS TRAF_CSAMR7950,
CASE
WHEN TOTAL.PMSAMPLBESTAMR5900RABESTABLISH = 0
THEN 0
ELSE TOTAL.PMSUMBESTAMR5900RABESTABLISH / TOTAL.PMSAMPLBESTAMR5900RABESTABLISH
END AS TRAF_CSAMR5900,
CASE
WHEN TOTAL.PMSAMPLBESTAMR4750RABESTABLISH = 0
THEN 0
ELSE TOTAL.PMSUMBESTAMR4750RABESTABLISH / TOTAL.PMSAMPLBESTAMR4750RABESTABLISH
END AS TRAF_CSAMR4750,
CASE
WHEN TOTAL.PMSAMPLEBESTDCHPSINTRABESTABLI = 0
THEN 0
ELSE TOTAL.PMSUMBESTDCHPSINTRABESTABLISH / TOTAL.PMSAMPLEBESTDCHPSINTRABESTABLI
END AS A,
CASE
WHEN TOTAL.PMSAMPLEFACHPSINTRABESTABLISH = 0
THEN 0
ELSE TOTAL.PMSUMFACHPSINTRABESTABLISH / TOTAL.PMSAMPLEFACHPSINTRABESTABLISH
END AS B,
CASE
WHEN TOTAL.PMSAMPBESTPSHSADCHRABESTABLISH = 0
THEN 0
ELSE TOTAL.PMSUMBESTPSHSADCHRABESTABLISH / TOTAL.PMSAMPBESTPSHSADCHRABESTABLISH
END AS C,
CASE
WHEN TOTAL.PMSAMPLBESTPSEULRABESTABLI = 0
THEN 0
ELSE TOTAL.PMSUMBESTPSEULRABESTABLISH / TOTAL.PMSAMPLBESTPSEULRABESTABLI
END AS D
FROM (SELECT UCELL2.DIA, UCELL2.HORA, UCELL2.RNC, UCELL2.UTRANCELL,
SUM(UCELL2.PMSAMPLESCS12RABESTABLISH) AS PMSAMPLESCS12RABESTABLISH,
SUM(UCELL2.PMSUMCS12RABESTABLISH) AS PMSUMCS12RABESTABLISH,
SUM(UCELL3.PMSAMPLESBESTCS57RABESTABLISH) AS PMSAMPLESBESTCS57RABESTABLISH,
SUM(UCELL3.PMSUMBESTCS57RABESTABLISH) AS PMSUMBESTCS57RABESTABLISH,
SUM(UCELL3.PMSAMPLESBESTCS64RABESTABLISH) AS PMSAMPLESBESTCS64RABESTABLISH,
SUM(UCELL3.PMSUMBESTCS64RABESTABLISH) AS PMSUMBESTCS64RABESTABLISH,
SUM(UCELL3.PMSUMBESTDCHPSINTRABESTABLISH) AS PMSUMBESTDCHPSINTRABESTABLISH,
SUM(UCELL3.PMSAMPLEBESTDCHPSINTRABESTABLI) AS PMSAMPLEBESTDCHPSINTRABESTABLI,
SUM(UCELL3.PMSUMFACHPSINTRABESTABLISH) AS PMSUMFACHPSINTRABESTABLISH,
SUM(UCELL3.PMSAMPLEFACHPSINTRABESTABLISH) AS PMSAMPLEFACHPSINTRABESTABLISH,
SUM(UCELL3.PMSUMBESTPSHSADCHRABESTABLISH) AS PMSUMBESTPSHSADCHRABESTABLISH,
SUM(UCELL3.PMSAMPBESTPSHSADCHRABESTABLISH) AS PMSAMPBESTPSHSADCHRABESTABLISH,
SUM(UCELL3.PMSUMBESTPSEULRABESTABLISH) AS PMSUMBESTPSEULRABESTABLISH,
SUM(UCELL3.PMSAMPLBESTPSEULRABESTABLI) AS PMSAMPLBESTPSEULRABESTABLI,
SUM(UCELL4.PMSAMPLBESTAMR12200RABESTABLIS) AS PMSAMPLBESTAMR12200RABESTABLIS,
SUM(UCELL4.PMSUMBESTAMR12200RABESTABLISH) AS PMSUMBESTAMR12200RABESTABLISH,
SUM(UCELL4.PMSAMPLBESTAMR7950RABESTABLISH) AS PMSAMPLBESTAMR7950RABESTABLISH,
SUM(UCELL4.PMSUMBESTAMR7950RABESTABLISH) AS PMSUMBESTAMR7950RABESTABLISH,
SUM(UCELL4.PMSAMPLBESTAMR5900RABESTABLISH) AS PMSAMPLBESTAMR5900RABESTABLISH,
SUM(UCELL4.PMSUMBESTAMR5900RABESTABLISH) AS PMSUMBESTAMR5900RABESTABLISH,
SUM(UCELL4.PMSAMPLBESTAMR4750RABESTABLISH) AS PMSAMPLBESTAMR4750RABESTABLISH,
SUM(UCELL4.PMSUMBESTAMR4750RABESTABLISH) AS PMSUMBESTAMR4750RABESTABLISH
FROM EGW.TF_RNC_RAN_UCELL2 UCELL2
INNER JOIN
EGW.TF_RNC_RAN_UCELL3 UCELL3
ON UCELL2.DIA = UCELL3.DIA
AND UCELL2.HORA = UCELL3.HORA
AND UCELL2.RNC = UCELL3.RNC
AND UCELL2.MO = UCELL3.MO
AND UCELL2.MINUTO = UCELL3.MINUTO
AND UCELL2.UTRANCELL = UCELL3.UTRANCELL
INNER JOIN
EGW.TF_RNC_RAN_UCELL4 UCELL4
ON UCELL2.DIA = UCELL4.DIA
AND UCELL2.HORA = UCELL4.HORA
AND UCELL2.RNC = UCELL4.RNC
AND UCELL2.MO = UCELL4.MO
AND UCELL2.MINUTO = UCELL4.MINUTO
AND UCELL2.UTRANCELL = UCELL4.UTRANCELL
INNER JOIN
JANO.FECHAS FECHAS
ON UCELL2.DIA = FECHAS.FECHA
""" + hp_inner_join + """
WHERE UCELL2.DIA BETWEEN TO_DATE(%s, 'YYYY-MM-DD') AND TO_DATE(%s, 'YYYY-MM-DD')
AND UCELL2.HORA BETWEEN %s AND %s
AND UCELL2.RNC = %s
AND UCELL2.UTRANCELL = %s
AND FECHAS.DIASEM IN (%s,%s,%s,%s,%s,%s,%s)
""" + holidays_filter + """
GROUP BY UCELL2.DIA, UCELL2.HORA, UCELL2.RNC, UCELL2.UTRANCELL) TOTAL) CUSTOM
ORDER BY CUSTOM.DIA, CUSTOM.HORA
"""