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AskSQLTeam
Ask SQLTeam Question
0 Posts |
 Posted - 2003-11-20 : 08:03:22
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| Prakash writes "Hi,I have an ETL application in C# that processes 10-20 million recordsin a single run. I have set it up so that it processes in chunks of few thousand records at a time.In th process of optimizing the read from operational database I found that each read is taking about 800 milliseconds. I ran the same stored proc (used for reading from application) from query analyzer and it takes only about 200 milliseconds. This was little surprising so I checked the execution plan for both but they are exactly same and doing exactly same number of reads too (captured data from profiler). I have repeated this several times and made sure there was nothing cached but same recults This is how I create connection in applicationcStr = "Initial Catalog=myDB; Data Source=myServer; Integrated Security=SSPI; Connect Timeout=300";SqlConnection cn = new SqlConnection (cStr);cn.Open();This is how I execute stored procSqlCommand cmd = new SqlCommand(sqlString, connection);cmd.CommandType = CommandType.StoredProcedure;//set paramsSqlDataReader readAllCursor = cmd.ExecuteReader();Any ideas why reading from C# application so slow compared to from query analyzer?" |
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robvolk
Most Valuable Yak
15732 Posts |
Posted - 2003-11-20 : 08:05:02
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| Query Analyzer has less overhead than .Net. You didn't specify how you determined the 800ms read time, and I would wager that it's probably taking about the same time to read the data, but the extra 600 ms of .Net overhead is invisibly lumped in there. |
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Reading from MS SQL database