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POReally Slow Performance Reading from Access 2007 (accdb) file from C#
 

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  1. POReally Slow Performance Reading from Access 2007 (accdb) file from C#
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    <p>I am writing an application on Visual Studio 2008 with C#. The application reads data from an access file and then generates a txt file. I was doing some tests with a mdb file with 1.000.000 records and almost 1GB size. The code is like this and the overall process was taking between 8 - 10 minutes to complete.</p> <pre><code>var connStr = string.Format("Provider =Microsoft.Jet.OLEDB.4.0; Data Source={0};Persist Security Info=False", this.dbPath); using (var conn = new OleDbConnection(connStr)) { using (var command = conn.CreateCommand()) { command.CommandText = "SELECT * from Registros r, FOIDS f where r.TICKET = f.TICKET"; command.CommandType = System.Data.CommandType.Text; conn.Open(); int i = 0; string ticket = string.Empty; using (var reader = command.ExecuteReader()) { while (reader.Read()) { i++; if (!reader.IsDBNull(reader.GetOrdinal("r.TICKET"))) { ticket=reader.GetString(reader.GetOrdinal("r.TICKET")); // Some process } } } } } } </code></pre> <p>Today I received an accdb file (Access 2007), so I've changed my connection string to this one:</p> <pre><code>connStr = string.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Persist Security Info=False", this.dbPath); </code></pre> <p>But after that change, reading the new file is taking about 4-5 seconds per record !!! So, my overall process would take a lot of DAYS to complete! I've tried converting the accdb file to an old mdb file and after that reading again with the previous connection string, but the problem remains. I think is a problem with the database itself but I don't know what to do, in internet i didn't found any information with this kind of problem.</p> <p>Any ideas? Suggestions?</p>
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    1. USuser972331
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    1. COIs it possible that its not the reading of the MDB that is taking to much time but rather the "//some process" portion? Is it something that you could make Async?
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      1. USMatt
    2. COI did some debugging and the delay is on the reader.Read() instruction. Also I've added some logs with the same result and also I've commented the process with same results. Thanks for your quick response !
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    3. COhave you tried compacting the database?
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      1. USMitch Wheat
 

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