Lost database connection

1. Why does MySQL lost connection?
2. How do I test a database connection?
3. How do I change my database connection?
4. What is meant by database connectivity?
5. What is Connect_timeout in MySQL?
6. How do I change the connection timeout in MySQL?
7. How do I know if my database is reachable?
8. How do I check SQL database connection?
9. How do I test a remote database connection?
10. How do I switch between SQL databases?
11. How do I switch between databases in SQL Server?
12. How do I switch databases in SQL Server?

Why does MySQL lost connection?

Open the MySQL Workbench Preferences. Check if the SSH Timeout and DBMS Timeout value is set to only a few seconds. Try to increase the default value of the connection timeouts. Save the settings, close the MySQL Workbench and reopen the connection to see if you are able to connect to the database.

How do I test a database connection?

Background

1. Create a file on the server called test. udl.
2. Double-click the test. ...
3. Click the Provider tab.
4. Select Microsoft OLE DB Provider for SQL Server.
5. Click Next.
6. On the Connection tab, enter the connection information entered for the database connection: ...
7. Type the SQL database credentials.
8. Click Test Connection.

How do I change my database connection?

Changing the Database Connection

1. From the Explore Repository, select Tools, and then Change Database Connections.
2. In the Type field, select a report type, then an item, and then click OK.
3. In Change Database Connection, select the item, and then click OK.
4. In Find all references to the Database Connection, select the database connection to change.

What is meant by database connectivity?

A Database connection is a facility in computer science that allows client software to talk to database server software, whether on the same machine or not. A connection is required to send commands and receive answers, usually in the form of a result set. Connections are a key concept in data-centric programming.

What is Connect_timeout in MySQL?

connect_timeout tells PHP how long it should wait for a response from the MySQL server when it tries to connect. connect_timeout in MySQL configuration tells the MySQL server how long to wait for a connect packet from the client before responding with a Bad handshake error.

How do I change the connection timeout in MySQL?

Change the MySQL timeout on a server

1. Log in to your server by using Secure Shell® (SSH).
2. Use the sudo command to edit my. ...
3. Locate the timeout configuration and make the adjustments that fit your server. ...
4. Save the changes and exit the editor.
5. Use the following command to restart MySQL and apply the changes, if required: $ sudo /etc/init.d/mysql restart.

How do I know if my database is reachable?

Connecting to Your Database with Telnet

To test the connection to your database, run the telnet hostname port on your Looker server. For example, if you are running MySQL on the default port and your database name is mydb, the command would be telnet mydb 3306 .

How do I check SQL database connection?

How to test SQL server connection?

1. Go to the command prompt window (Run→cmd)
2. Enter sqlcmd and press enter.
3. You now have a trusted connection to the default instance of SQL Server that is running on your computer. 1→ is the sqlcmd prompt that specifies the line number. ...
4. To end the sqlcmd session, type EXIT at the sqlcmd prompt.

How do I test a remote database connection?

2. Test Remote Connection to MySQL

1. Log into the agent host as root .
2. Open the install.properties file and find the connection information, for example: XAAUDIT.DB.HOSTNAME=poliymgr XAAUDIT.DB.DATABASE_NAME=xasecure XAAUDIT.DB.USER_NAME=xasecure XAAUDIT.DB.PASSWORD=hadoop.

How do I switch between SQL databases?

The only way to switch between databases right now is to misuse our loadbalancer. The application always uses the same ip to access the database server. The loadbalancer decides how this IP is resolved: After updates it uses the ip of the updated server.

How do I switch between databases in SQL Server?

To change the connection associated with a query

1. In Query Editor, right-click a blank area of Query Editor, point to Connection, and then click Change Connection.
2. In the Connect to Database Engine dialog box, provide the new connection information, and then click Connect.

How do I switch databases in SQL Server?

How to switch database context to newly created database?

1. USE master;
2. IF (db_id('myDB') is null)
3. CREATE DATABASE myDB;
4. USE myDB;