C#代码读取MSserver数据库为什么逻辑读取这么大
Audit Logout cpu:0 reads:29116676 writes 32730 duration 13
……
Audit Logout cpu:0 reads:29116671 writes 32730 duration 16
追踪了一下，结果逻辑读取这么大。谁帮我看一下。是我重复打开的原因吗？


public string strcon = "Integrated Security=SSPI;Initial Catalog='db123';Data Source='Ghost-1383119';User ID='sa';Password='sa';Connect Timeout=0";
try
{
SqlConnection conn = new SqlConnection(strcon);
conn.Open();
strSQL = "select id,title,keyword from web where id<120 and id>98 order by id asc";
SqlDataAdapter da = new SqlDataAdapter(strSQL, conn);
da.SelectCommand.CommandTimeout = 60000;

da.Fill(ds, "web");
conn.Close();
n = ds.Tables["web"].Rows.Count;

foreach (DataRow dr in ds.Tables["web"].Rows)
{
titleid = dr["id"].ToString();
if (titleid != null)
{
titleid = titleid.ToString();
}



long id = long.Parse(inputid);
string strNextSQL = "select top 1 id,title,time from web where keyword='" + keyword + "' and id>" + id + " order by id asc";

SqlConnection con = new SqlConnection(strcon);
con.Open();
SqlDataAdapter datar = new SqlDataAdapter(strPrevSQL, con);

DataSet ds = new DataSet();
datar.Fill(ds);
previd = ds.Tables[0].Rows[1]["id"].ToString();
prevtitle = ds.Tables[0].Rows[1]["title"].ToString();
ds = null;
con.Close();

SqlConnection mycon = new SqlConnection(strcon);
mycon.Open();

long id = long.Parse(inputid);
string strSQL = "select * from web where id=" + id;
SqlDataReader dr = null;
SqlCommand mycommand = new SqlCommand(strSQL, mycon);
dr = mycommand.ExecuteReader();
while (dr.Read())
{
titleid = dr["id"].ToString();
title = dr["title"].ToString();
}
dr.Close();
mycommand.CommandText = "update web set show_path=1 where id=" + long.Parse(inputid);
mycommand.ExecuteNonQuery();
mycon.Close();

}


[解决办法]
不是这么“看看”就能看出问题所在的，你需要看sql server的执行计划，分析哪里有索引扫描或者全表扫描，看看是否缺索引等等。就sql语句来说，order by也会影响性能