SqlCeConnection比SqlConnection慢

Question

In my C# app I can switch between Online SQL-Server connection and local SQLCE (sdf file) connection. Both DBs are the same in structure and indexes.

But using the local SDF file through SqlCeConnection is so much slower - 20 times slower when doing a lot of calls.

Example:

using (DbConnection connection = new SqlCeConnection(ConnectionString))
{
    connection.Open();
    using (DbCommand cmd = GetSqlCommand("select * from t", connection))
    {
        try
        {
            var reader = cmd.ExecuteReader();
            while (reader.Read())
            {
                ...
            }
            reader.Close();
        }
        catch (Exception e)  {  }
    }
}

What is going on here - can I optimize that?

Answer 1

Keep a single connection open and unused for the lifetime of your app, SQL Compact does not have connection pooling.

In addition, opening a SqlCeConnection can be slow because of:

• The database file has been created on another platform
• The ACL (Access Control List) on the RSA folder is corrupt
• Invalid Internet Proxy configuration

More info here: http://erikej.blogspot.dk/2013/08/faq-why-is-opening-my-sql-server.html