SQL Query slow in .NET application but instantaneous in SQL Server Management Studio
- by user203882
Here is the SQL
SELECT tal.TrustAccountValue
FROM TrustAccountLog AS tal
INNER JOIN TrustAccount ta ON ta.TrustAccountID = tal.TrustAccountID
INNER JOIN Users usr ON usr.UserID = ta.UserID
WHERE usr.UserID = 70402 AND
ta.TrustAccountID = 117249 AND
tal.trustaccountlogid =
(
SELECT MAX (tal.trustaccountlogid)
FROM TrustAccountLog AS tal
INNER JOIN TrustAccount ta ON ta.TrustAccountID = tal.TrustAccountID
INNER JOIN Users usr ON usr.UserID = ta.UserID
WHERE usr.UserID = 70402 AND
ta.TrustAccountID = 117249 AND
tal.TrustAccountLogDate < '3/1/2010 12:00:00 AM'
)
Basicaly there is a Users table a TrustAccount table and a TrustAccountLog table.
Users: Contains users and their details
TrustAccount: A User can have multiple TrustAccounts.
TrustAccountLog: Contains an audit of all TrustAccount "movements". A TrustAccount is associated with multiple TrustAccountLog entries.
Now this query executes in milliseconds inside SQL Server Management Studio, but for some strange reason it takes forever in my C# app and even timesout (120s) sometimes.
Here is the code in a nutshell. It gets called multiple times in a loop and the statement gets prepared.
cmd.CommandTimeout = Configuration.DBTimeout;
cmd.CommandText = "SELECT tal.TrustAccountValue FROM TrustAccountLog AS tal INNER JOIN TrustAccount ta ON ta.TrustAccountID = tal.TrustAccountID INNER JOIN Users usr ON usr.UserID = ta.UserID WHERE usr.UserID = @UserID1 AND ta.TrustAccountID = @TrustAccountID1 AND tal.trustaccountlogid = (SELECT MAX (tal.trustaccountlogid) FROM TrustAccountLog AS tal INNER JOIN TrustAccount ta ON ta.TrustAccountID = tal.TrustAccountID INNER JOIN Users usr ON usr.UserID = ta.UserID WHERE usr.UserID = @UserID2 AND ta.TrustAccountID = @TrustAccountID2 AND tal.TrustAccountLogDate < @TrustAccountLogDate2 ))";
cmd.Parameters.Add("@TrustAccountID1", SqlDbType.Int).Value = trustAccountId;
cmd.Parameters.Add("@UserID1", SqlDbType.Int).Value = userId;
cmd.Parameters.Add("@TrustAccountID2", SqlDbType.Int).Value = trustAccountId;
cmd.Parameters.Add("@UserID2", SqlDbType.Int).Value = userId;
cmd.Parameters.Add("@TrustAccountLogDate2", SqlDbType.DateTime).Value =TrustAccountLogDate;
// And then...
reader = cmd.ExecuteReader();
if (reader.Read())
{
double value = (double)reader.GetValue(0);
if (System.Double.IsNaN(value))
return 0;
else
return value;
}
else
return 0;
