Performance 实体框架SQL选择600多列
我有一个针对oracle运行的实体框架生成的查询太慢了。它运行大约4秒钟 这是我询问的主要部分Performance 实体框架SQL选择600多列,performance,oracle,entity-framework,entity-framework-4,Performance,Oracle,Entity Framework,Entity Framework 4,我有一个针对oracle运行的实体框架生成的查询太慢了。它运行大约4秒钟 这是我询问的主要部分 var query = from x in db.BUILDINGs join pro_co in db.PROFILE_COMMUNITY on x.COMMUNITY_ID equals pro_co.COMMUNITY_ID join co in db.COMMUNITies on x.COMMUNITY_ID eq
var query = from x in db.BUILDINGs
join pro_co in db.PROFILE_COMMUNITY on x.COMMUNITY_ID equals pro_co.COMMUNITY_ID
join co in db.COMMUNITies on x.COMMUNITY_ID equals co.COMMUNITY_ID
join st in db.STATE_PROFILE on co.STATE_CD equals st.STATE_CD
where pro_co.PROFILE_NM == authorizedUser.ProfileName
select new
{
COMMUNITY_ID = x.COMMUNITY_ID,
COUNTY_ID = x.COUNTY_ID,
REALTOR_GROUP_NM = x.REALTOR_GROUP_NM,
BUILDING_NAME_TX = x.BUILDING_NAME_TX,
ACTIVE_FL = x.ACTIVE_FL,
CONSTR_SQFT_AVAIL_NB = x.CONSTR_SQFT_AVAIL_NB,
TRANS_RAIL_FL = x.TRANS_RAIL_FL,
LAST_UPDATED_DT = x.LAST_UPDATED_DT,
CREATED_DATE = x.CREATED_DATE,
BUILDING_ADDRESS_TX = x.BUILDING_ADDRESS_TX,
BUILDING_ID = x.BUILDING_ID,
COMMUNITY_NM = co.COMMUNITY_NM,
IMAGECOUNT = x.BUILDING_IMAGE2.Count(),
StateCode = st.STATE_NM,
BuildingTypeItems = x.BUILDING_TYPE_ITEM,
BuildingZoningItems = x.BUILDING_ZONING_ITEM,
BuildingSpecFeatures = x.BUILDING_SPEC_FEATURE_ITEM,
buildingHide = x.BUILDING_HIDE,
buildinghideSort = x.BUILDING_HIDE.Count(y => y.PROFILE_NM == ProfileName) > 0 ? 1 : 0,
BUILDING_CITY_TX = x.BUILDING_CITY_TX,
BUILDING_ZIP_TX = x.BUILDING_ZIP_TX,
LPF_GENERAL_DS = x.LPF_GENERAL_DS,
CONSTR_SQFT_TOTAL_NB = x.CONSTR_SQFT_TOTAL_NB,
CONSTR_STORIES_NB = x.CONSTR_STORIES_NB,
CONSTR_CEILING_CENTER_NB = x.CONSTR_CEILING_CENTER_NB,
CONSTR_CEILING_EAVES_NB = x.CONSTR_CEILING_EAVES_NB,
DESCR_EXPANDABLE_FL = x.DESCR_EXPANDABLE_FL,
CONSTR_MATERIAL_TYPE_TX = x.CONSTR_MATERIAL_TYPE_TX,
SITE_ACRES_SALE_NB = x.SITE_ACRES_SALE_NB,
DESCR_PREVIOUS_USE_TX = x.DESCR_PREVIOUS_USE_TX,
CONSTR_YEAR_BUILT_TX = x.CONSTR_YEAR_BUILT_TX,
DESCR_SUBDIVIDE_FL = x.DESCR_SUBDIVIDE_FL,
LOCATION_CITY_LIMITS_FL = x.LOCATION_CITY_LIMITS_FL,
TRANS_INTERSTATE_NEAREST_TX = x.TRANS_INTERSTATE_NEAREST_TX,
TRANS_INTERSTATE_MILES_NB = x.TRANS_INTERSTATE_MILES_NB,
TRANS_HIGHWAY_NAME_TX = x.TRANS_HIGHWAY_NAME_TX,
TRANS_HIGHWAY_MILES_NB = x.TRANS_HIGHWAY_MILES_NB,
TRANS_AIRPORT_COM_NAME_TX = x.TRANS_AIRPORT_COM_NAME_TX,
TRANS_AIRPORT_COM_MILES_NB = x.TRANS_AIRPORT_COM_MILES_NB,
UTIL_ELEC_SUPPLIER_TX = x.UTIL_ELEC_SUPPLIER_TX,
UTIL_GAS_SUPPLIER_TX = x.UTIL_GAS_SUPPLIER_TX,
UTIL_WATER_SUPPLIER_TX = x.UTIL_WATER_SUPPLIER_TX,
UTIL_SEWER_SUPPLIER_TX = x.UTIL_SEWER_SUPPLIER_TX,
UTIL_PHONE_SVC_PVD_TX = x.UTIL_PHONE_SVC_PVD_TX,
CONTACT_ORGANIZATION_TX = x.CONTACT_ORGANIZATION_TX,
CONTACT_PHONE_TX = x.CONTACT_PHONE_TX,
CONTACT_EMAIL_TX = x.CONTACT_EMAIL_TX,
TERMS_SALE_PRICE_TX = x.TERMS_SALE_PRICE_TX,
TERMS_LEASE_SQFT_NB = x.TERMS_LEASE_SQFT_NB
};
Building
--------------------
- BuildingID
- CommunityId
- Lots of other columns
Profile_Community
-----------------------
- CommunityId
- ProfileNM
- lots of other columns
state_profile
---------------------
- StateCD
- ProfileNm
- lots of other columns
Profile
---------------------
- Profile-NM
- a few other columns
你知道为什么SQL中会返回这么多列，或者如何加快查询速度吗？我怀疑某些性能会受到对象创建的影响。尝试在不使用基本select x的情况下运行查询，看看是SQL查询需要时间还是对象创建需要时间
另外，如果生成的查询太复杂，您可以尝试将其分离为更小的子查询，从而逐渐丰富对象，而不是一次查询所有内容。我创建了一个视图，让视图只选择我想要的列，并连接需要在linq中保持连接的内容
EF从您试图连接的每个表中选择每一列，这是非常恼人的。但我想我之所以注意到这一点，是因为我加入了一组包含150多列的表 什么是表结构和索引以及解释计划？大多数查询都不可能在没有的情况下进行有效的调试。第二，如果这看起来有点差劲，我很抱歉，但1554的成本并没有在应用程序中对你大喊大叫？这是一个简单的查询，花费20英镑可能会让你大吃一惊。我会考虑添加表结构，并计划添加到我的问题中。你知道从sql开发者那里拿出解释计划的好方法吗？我想屏幕截图是最简单的方法。。。编辑窗口中有一个图像上传按钮。或者有。每个表中的每一列，而不仅仅是我想要的，这很奇怪。你确定在你遗漏的部分没有收费表吗？那会很难，因为where子句块很长，但我会在早上试一试。谢谢你的主意！