I have a application in asp.net with mySQL database.
When many clients are using the application on the same time there begins to come mysql errors:
ERROR [HY000] [MySQL][ODBC 5.1 Driver]Can't connect to MySQL server on (myip)
The error always occor in lines like:
conn.open()` OR `cmd.fill(ds,"mytable")
I have checked the numbers of connection with the tool Jet Profiler and the numbers of open connection doesnt exceed the allowed number.
In the Jet Profiler tool seems everything OK when the error occur.
I am using connection pool
What could cause this random error?
Related
We have built RFID based system identification application in LabView using MySQL as database.
We have one same software running on two similar computers. Few months before application was running properly on both the computers. Now one is running smoothly but the second one gives following error.
ADO error: 0x80040e14 exception occurred in microsoft ole db provider for odbc drivers [MYSQL] [ODBC 8.0(a)] [mysqld-8.0.20] You have an error in your SQL syntax; check the manual corresponds to your MySQL version for the right syntax yo user near "RFID_tag_number' at line 1 in NI_Database_API.lvlib:Conn Execute.vi...till path of the file.
As you can see there is double inverted comma before RFID_tag_number in the error, but in our code we have only used single inverted comma as it is a string value. We tried to copy complete application from the computer where it is properly running to the second computer but still getting the same error.
The only difference between both computers we found is -
In the computer running properly - In MySQL Workbench >Administrator >Server Status, the Configuration Path is My SQL Server 5.7\my.ini
And in the second computer it is My SQL Server 8.0\my.ini.
We don't know if this is the reason for the error or how the configuration path affects the application. We even tried to remove MySQL server 8.0 completely from computer with the issue and installed MySQL server 5.7 but still the path remained same.
Can anyone help us? We are new to LabView working with MySQL.
What I understand, error will throw for incorrect query,it might be required handling special characters.
Second if same data base access by both system
,system required same version my mysql and odbc driver also.
Third, when you try to remove mysql, delete hidden files in c drive then install new version
This is really odd to me. I am using an ODBC connection as a data source in SSIS. I am able to preview data, but when I attempt to execute the package (still within Visual Studio for development), I get an error on the initial data source.
The error I am receiving is:
There was an error trying to establish an Open Database Connectivity (ODBC) connection with the database server.
The AcquireConnection method call to the connection manager xxx failed with error code 0xC0014009. There may be error messages posted before this with more information on why the AcquireConnection method call failed.
ODBC Source failed validation and returned error code 0x80004005.
Clearly I have the right username, password, and ODBC connection to some degree, because I am able to see the data. However I am failing on establishing the connection when I attempt to run the package, so I must be doing something wrong. Any idea what it might be?
It ended up being that the drivers associated with the ODBC connection (gsk8ssl.dll) installed on the machine needed to be added to the path variables on both my local and on the server. This was for connecting to a DB2 database.
I have been experiencing an intermittent SQL connection problem that I can't resolve. First of all I will explain the setup:
Windows 2008 R2 Standard SP1 (and all patches delivered through windows update):
This server runs IIS 7.5
The ASP.NET MVC 4 Web App runs within it's own App Pool
The App Pool identity is used to set permission on the folder containing the code
The Web App passed a username and password in the connection string - server xxx; database=xxx; Persist Security Info=True; User ID=xxx; Password=xxx; Pooling=False; Network=DBMSSOCN;
elmah used to log errors
Windows 2008 R2 Standard SP1 (and all patches delivered through windows update):
This server runs SQL Server 2008 R2 Web Edition SP2
TCP/IP is the only enabled Client Protocol
These are VM's hosted by our cloud provider. The cloud provider has investigated, from an infrastructure point of view, but cannot find any problems.
The error messages generated are as follows:
System.Data.SqlClient.SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 9 - Associating port with I/O completion mechanism failed)
I've been unable to find any information on error code 9.
System.Data.SqlClient.SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 0 - An operation was attempted on something that is not a socket.) ---> System.ComponentModel.Win32Exception (0x80004005): An operation was attempted on something that is not a socket
While these errors are generated, IIS will show the 'friendly error' page. It usually takes around 15 minutes for the issueto resolve itself or an IISReset. When this issue first occurred I downloaded a SQL Load Generator from codeplex and ran test up to 300 simultaneous connections with multiple query's and everything was ok. I also ran another test while the web app was generating the SQL exceptions - all connections from the load test succeeded. This really confused me!?!
No Event Logs are created during the outage.
To me the error message indicates a problem connecting to the SQL box, however the load test run during the most recent outage contradicts this - yet IIS is still serving content (configured error message).
I realize that this is a difficult question, however I would be very grateful for any advice regarding techniques to find the cause of the error. Any information on what error 9 relates to would also be helpful.
I'm connected to analysis server:localhost\sqlr2.
I'm using windows authentication,so user name and password are all grayed out.
I'm trying to deploy a project from Visual Studio BI to SQL Server 2008R2 analysis server and get the following errors:
Error 1 Internal error: The operation terminated unsuccessfully. 0 0
Error 2 OLE DB error: OLE DB or ODBC error: Login timeout expired; HYT00; A network-related or instance-specific error has occurred while establishing a connection to SQL Server. Server is not found or not accessible. Check if instance name is correct and if SQL Server is configured to allow remote connections. For more information see SQL Server Books Online.; 08001; Named Pipes Provider: Could not open a connection to SQL Server [53]. ; 08001. 0 0
Error 3 Errors in the high-level relational engine. A connection could not be made to the data source with the DataSourceID of 'Max Min Manufacturing DM', Name of 'Max Min Manufacturing DM'. 0 0
It looks like your datasource is set up wrong. When you process, what server is the cube pointed at? What account does SSAS run under? How have you set up the connection string in the datasource? Are you seeing failed login attempts in the SQL Server logs?
Error 2 OLE DB error: OLE DB or ODBC error: Login timeout expired; HYT00;
A network-related or instance-specific error has occurred while establishing a
connection to SQL Server. Server is not found or not accessible.
Check if instance name is correct and if SQL Server is configured
to allow remote connections.
I'd focus on this. I assume you must be able to connect to SQL Server in Visual Studio to build your cube, so I guess Analysis Services doesn't have permissions. Check your connection strings.
You say you're using Windows Authentication, so does the service accounts that Analysis Services runs under have access to the required database?
I would like to share my experience with this error and how I discovered the solution.
Hope it helps!
http://afsawaf.blogspot.com/2013/08/ole-db-error-ole-db-or-odbc-error.html
---Thanks #kleopatra for the advice.
In my case I was connecting with a wrong provider, I was trying to connect using SQL Server Native Client 11.0 to MS SQL Server 2005 DB which caused my similar problem.
When I reverted to version 10.0, worked perfectly!
I get the following exception in my project (.NET socket server):
ERROR HY000: [ODBC Driver 3.51] Can't connect to MySQL server 'someHost' (10060)
The error does not occur every single time, though. So that rules out configuration errors or incorrect login details. Also when I show all my %max% variables, I'm not getting close on any of them. Unfortunately the verbosity of the logging cannot be changed, and the logs have not been written to recently.
What can cause these sporadic connect failures?