For more information about creating or changing a database connection, see Database connection. Verify that the connection settings for the selected database connection are correct. Verify that you use a correct port number with your database administrator. Real port numbers might be different on your system. The following list is a list of default port numbers.ġ0000 (Hive Server2) or 9083 (Hive Metastore) Different database vendors use different ports for their databases. Hosts use port numbers to determine to which application, service, or process a connection must be established. Port: A number that identifies a connection point between hosts. For example, in MySQL you can run SHOW GRANTS. Run a query in a database command line to see names of all available databases. User: A name of a user that has sufficient privileges to perform actions with a database. For example, in MySQL you can run SHOW DATABASES. In some cases, it is possible to run a query in a database command line to see names of all available databases. You can find the database name in the settings of your database server, or you can ask your database administrator. It can be an IP address 127.0.0.1 or a domain name localhost.ĭatabase: A name of the database to which you want to connect. Host: A hostname of a computer or other device that stores a database. Most database include the connection settings: Check your connection propertiesĮach database (MySQL, PostgreSQL, Oracle, or any other vendor) has its own connection settings. The telnet command allows you to check if the port is opened for communication. The server eventually resets ~152 connections.For security reasons, DBMS usually drops all telnet connections. The Ubuntu one runs fine maintaining a steady 8-16 connections, but the Red Hat one leaks connections and the connection count grows, never going down. I have two servers running the identical code: I have a web application running on Tomcat7 that connects to MySQL 5.5.
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