【发布时间】：2013-05-30 01:34:49
【问题描述】：
我正在 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。
为什么性能差异如此之大？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
"""
【问题讨论】：
-
你的意思是 sqlplus 吗？返回多少行数据？您确定查询是 EXACT 吗？是否在一个与另一个中使用绑定参数。请显示您的应用服务器中的表结构、sqlplus 运行和 sql 代码。如果您在每个环境中多次运行相同的查询，执行时间是否一致？
-
好点。查询不完全相同。在 Django 中，我使用绑定参数，而在 Oracle SQL Server 中（我想它在后台使用 sqlplus）在查询中硬编码的“参数”。我做了一个测试，用硬编码参数修改了 Django 查询，性能提高了很多。如何在 Django 中使用绑定参数获得相同的性能？
-
你的模型是什么样的？
-
我的应用中没有任何模型。它只是对数据库进行查询以使用图表呈现数据的可视化表示