Solved

UPDATE MySql table simultaneously no possible?

Posted on 2009-05-05
8
1,194 Views
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)

Open in new window

0
Comment
Question by:MSFanboy
  • 4
  • 4
8 Comments
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 24303070
table structure? engine? indexes?
update/select statements?
0
 

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();
        }


0
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 24304542
does the field artnum have a index? is it the primary key?
0
Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

 

Author Comment

by:MSFanboy
ID: 24304626
No its not a Primary Key. It has varchar(255) AND set to "Not Null"
0
 
LVL 143

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)
0
 

Author Comment

by:MSFanboy
ID: 24314580
artnum is my PK
0
 
LVL 143

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 ...
0
 

Accepted Solution

by:
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...
0

Featured Post

Master Your Team's Linux and Cloud Stack

Come see why top tech companies like Mailchimp and Media Temple use Linux Academy to build their employee training programs.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Load balancing is the method of dividing the total amount of work performed by one computer between two or more computers. Its aim is to get more work done in the same amount of time, ensuring that all the users get served faster.
This article shows how to deploy dynamic backgrounds to computers depending on the aspect ratio of display
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…
This video shows how to use Hyena, from SystemTools Software, to bulk import 100 user accounts from an external text file. View in 1080p for best video quality.

861 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question