SQLSERVER 占了500多M内存,原来的程序无法一次查询出50多W数据了,记录下这个问题的解决过程。
今天需要使用“数据同步程序”将外网数据库的FundYield 数据重新同步到内网,上次成功的一次将50W数据查询了出来,但这次不行了。记得上次外网服务器剩余内存较多,SQLSERVER只占用了150M,这次占了500多M,程序无论如何也不能一次查询出50W数据来,老是查询超时,但这个数据着急要,只有想办法了。
系统使用每个表的最后修改日期(ZHXGRQ)字段作为更新的标记,检查了下数据,发现有51W多条数据都是 1999-1-1 ,除非程序将这51W条数据全部一次查询出来,否则只有另外想办法。看了下表结构,还有一个ID字段(bigint类型),虽然不是主键,但不重复,这样我们可以使用这个字段作为“分页”的依据了,每次查询个10-20W数据是没有问题,于是将原来的实体类修改为下面的样子:
namespace WFT_DataSyncModel
{
[Serializable()]
public partial class FundYield : EntityBase, WcfMail.Interface.IDataSyncEntity
{
public FundYield()
{
TableName = "FundYield";
EntityMap=EntityMapType.SqlMap;
//IdentityName = "标识字段名";
//PrimaryKeys.Add("主键字段名");
PrimaryKeys.Add("jjdm");
PrimaryKeys.Add("FSRQ");
PropertyNames = new string[] { "ID","jjdm","jjmc","jjjc","dwjz","ljjz","FSRQ","QuarterYield","DayYield","WeekYield","WeekYieldPM","Month1Yield","Month1YieldPM","Month3Yield","Month3YieldPM","Month6Yield","YearYield","YearYieldPM","Year1Yield","Year1YieldPM","Year2Yield","Year3Yield","totalyield","bzc3","bzc6","bzc12","bzc24","BuyState","addtime","ZHXGRQ","DayYieldPM","Month6YieldPM","Year2YieldPM","Year3YieldPM","totalyieldPM","DayYieldCount","WeekYieldCount","Month1YieldCount","Month3YieldCount","Month6YieldCount","YearYieldCount","Year1YieldCount","Year2YieldCount","Year3YieldCount","totalYieldCount" };
PropertyValues = new object[PropertyNames.Length];
}
//...实体属性在此省略
}
{
[Serializable()]
public partial class FundYield : EntityBase, WcfMail.Interface.IDataSyncEntity
{
public FundYield()
{
TableName = "FundYield";
EntityMap=EntityMapType.SqlMap;
//IdentityName = "标识字段名";
//PrimaryKeys.Add("主键字段名");
PrimaryKeys.Add("jjdm");
PrimaryKeys.Add("FSRQ");
PropertyNames = new string[] { "ID","jjdm","jjmc","jjjc","dwjz","ljjz","FSRQ","QuarterYield","DayYield","WeekYield","WeekYieldPM","Month1Yield","Month1YieldPM","Month3Yield","Month3YieldPM","Month6Yield","YearYield","YearYieldPM","Year1Yield","Year1YieldPM","Year2Yield","Year3Yield","totalyield","bzc3","bzc6","bzc12","bzc24","BuyState","addtime","ZHXGRQ","DayYieldPM","Month6YieldPM","Year2YieldPM","Year3YieldPM","totalyieldPM","DayYieldCount","WeekYieldCount","Month1YieldCount","Month3YieldCount","Month6YieldCount","YearYieldCount","Year1YieldCount","Year2YieldCount","Year3YieldCount","totalYieldCount" };
PropertyValues = new object[PropertyNames.Length];
}
//...实体属性在此省略
}
在实体类 FundYield 中,有一个实体映射类型属性:
EntityMap=EntityMapType.SqlMap;//映射为自定义SQL查询
默认情况下,应该是
EntityMap=EntityMapType.Table;//映射为表
数据更新实体类必须继承一个数据更新接口:
WcfMail.Interface.IDataSyncEntity
好了,实体类的修改仅此以处,实体类映射指定为SqlMap类型,必须建立一个SqlMap配置文件,文件名固定是 “EntitySqlMap.config” ,下面是文件内容:
代码
<?xml version="1.0" encoding="utf-8"?>
<!--SQL-MAP 实体类自定义查询配置文件
SQL 语句不能使用 Select * from table 格式,必须指定跟实体类一致的字段定义,否则可能发生难以预测的错误。
要生成实体类,请使用PDF.NET 实体类工具。
有关PDF.NET,请了解 http://www.pwmis.com/sqlmap
power by dth,2010.12.8
-->
<configuration>
<Namespace name="WFT_DataSyncModel">
<Map name="FundYield">
<Sql>
<![CDATA[
SELECT
ID , jjdm , jjmc , jjjc , dwjz , ljjz , FSRQ , QuarterYield , DayYield , WeekYield , WeekYieldPM , Month1Yield , Month1YieldPM , Month3Yield , Month3YieldPM , Month6Yield , YearYield , YearYieldPM , Year1Yield , Year1YieldPM , Year2Yield , Year3Yield , totalyield , bzc3 , bzc6 , bzc12 , bzc24 , BuyState , addtime , ZHXGRQ , DayYieldPM , Month6YieldPM , Year2YieldPM , Year3YieldPM , totalyieldPM , DayYieldCount , WeekYieldCount , Month1YieldCount , Month3YieldCount , Month6YieldCount , YearYieldCount , Year1YieldCount , Year2YieldCount , Year3YieldCount , totalYieldCount
FROM FundYield where id < 400000
]]></Sql>
</Map>
</Namespace>
</configuration>
<!--SQL-MAP 实体类自定义查询配置文件
SQL 语句不能使用 Select * from table 格式,必须指定跟实体类一致的字段定义,否则可能发生难以预测的错误。
要生成实体类,请使用PDF.NET 实体类工具。
有关PDF.NET,请了解 http://www.pwmis.com/sqlmap
power by dth,2010.12.8
-->
<configuration>
<Namespace name="WFT_DataSyncModel">
<Map name="FundYield">
<Sql>
<![CDATA[
SELECT
ID , jjdm , jjmc , jjjc , dwjz , ljjz , FSRQ , QuarterYield , DayYield , WeekYield , WeekYieldPM , Month1Yield , Month1YieldPM , Month3Yield , Month3YieldPM , Month6Yield , YearYield , YearYieldPM , Year1Yield , Year1YieldPM , Year2Yield , Year3Yield , totalyield , bzc3 , bzc6 , bzc12 , bzc24 , BuyState , addtime , ZHXGRQ , DayYieldPM , Month6YieldPM , Year2YieldPM , Year3YieldPM , totalyieldPM , DayYieldCount , WeekYieldCount , Month1YieldCount , Month3YieldCount , Month6YieldCount , YearYieldCount , Year1YieldCount , Year2YieldCount , Year3YieldCount , totalYieldCount
FROM FundYield where id < 400000
]]></Sql>
</Map>
</Namespace>
</configuration>
注意一下名称空间和映射名称必须和类的定义一致。
OK,所需的工作完成,我们只改了一下实体类的映射类型和编写了一个实体类查询文件,编译项目,重新发布,开始执行,剩下的只是每次修改一下配置文件的查询条件了,比如我现在正在使用的条件:
where ID>=600000 and ID<800000
最后的工作就是等待它执行完成,这个任务就OK了。
==================
总结:
使用面向对象的方法(OO)也可以很方便的处理“纯数据问题”,数据只是对象的一部分,我们将数据放到对象中去处理,使得我们对新问题的处理变得很容易,这就是OO的美妙之处!