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UPDATE MySql table simultaneously no possible?

Posted on 2009-05-05
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Last Modified: 2012-05-06
Hello,

why can I not make a sql UPDATE at the same time on a MySql table. Me and my colleague are updating the same table at the same time.

The below Exceptions are from me. My colleague gets the error message, that he can not read dataset.



05.05.2009 08:54:53|ERROR|MySqlException in Methode threadLoop, Message: Fatal error encountered during command execution., Number:0
05.05.2009 08:54:53|ERROR|Nicht behandelter Fehlercode, in MySql Dokumentation nachschauen, Message: Fatal error encountered during command execution., InnerException:MySql.Data.MySqlClient.MySqlException: Fatal error encountered attempting to read the resultset. ---> MySql.Data.MySqlClient.MySqlException: Reading from the stream has failed. ---> System.IO.IOException: Von der Übertragungsverbindung können keine Daten gelesen werden: Eine vorhandene Verbindung wurde vom Remotehost geschlossen. ---> System.Net.Sockets.SocketException: Eine vorhandene Verbindung wurde vom Remotehost geschlossen
   bei System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
   bei System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   --- Ende der internen Ausnahmestapelüberwachung ---
   bei System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   bei System.IO.BufferedStream.ReadByte()
   bei MySql.Data.MySqlClient.MySqlStream.LoadPacket()
   --- Ende der internen Ausnahmestapelüberwachung ---
   bei MySql.Data.MySqlClient.MySqlStream.LoadPacket()
   bei MySql.Data.MySqlClient.MySqlStream.ReadPacket()
   bei MySql.Data.MySqlClient.NativeDriver.ReadResult(UInt64& affectedRows, Int64& lastInsertId)
   bei MySql.Data.MySqlClient.MySqlDataReader.GetResultSet()
   bei MySql.Data.MySqlClient.MySqlDataReader.NextResult()
   --- Ende der internen Ausnahmestapelüberwachung ---
   bei MySql.Data.MySqlClient.MySqlDataReader.NextResult()
   bei MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)

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Question by:MSFanboy
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LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 24303070
table structure? engine? indexes?
update/select statements?
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Author Comment

by:MSFanboy
ID: 24304006
if you mean the storage engine I think its MyISAM. About the table structure I can not say anything due to company...
 private int disableArticle(string str_Artnr)
        {
            mycomm = mycon.CreateCommand(); 
            mycomm.CommandText = "UPDATE tablename SET bbactiv = 0 WHERE artnum = " + str_Artnr;            
            return mycomm.ExecuteNonQuery();
        }


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LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 24304542
does the field artnum have a index? is it the primary key?
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Author Comment

by:MSFanboy
ID: 24304626
No its not a Primary Key. It has varchar(255) AND set to "Not Null"
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LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 24304698
please ensure that field does have a index on it, eventually a primary key (at least it looks to me that it might be the primary key)
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Author Comment

by:MSFanboy
ID: 24314580
artnum is my PK
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LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 24314639
then the optimization is ok, so far.

anything else needs deep investigations, like server settings (key_buffer_size, for example)
check if you have any logs in the mysql logs ...
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Accepted Solution

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MSFanboy earned 0 total points
ID: 24329235
too bad we can not check the mysql logs because the database is a webshop database from a sort of rent webshop system :/ We can just programm against the database but we cant touch the server settings etc...
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