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In computing, a connection string is a string that specifies information about a data source and the means of connecting to it. It is passed in code to an underlying driver or provider in order to initiate the connection. Whilst commonly used for a database connection, the data source could also be a spreadsheet or text file.
Once a connection has been built it can be opened and closed at will, and properties (such as the command time-out length, or transaction, if one exists) can be set. The Connection String is composed of a set of key/value pairs as dictated by the data access interface and data provider being used.
Without connection pooling mechanisms (e.g., HikariCP, pgbouncer), idle or excessive connections can strain database resources. Virtual Machine-Based Environments: AWS EC2 instances scale connection demand with the number of instances. Manual or automated tuning of connection pool parameters is essential to prevent exceeding database limits.
An example of this is the KPRB (Kernel Program Bundled) driver [16] supplied with Oracle RDBMS. "jdbc:default:connection" offers a relatively standard way of making such a connection (at least the Oracle database and Apache Derby support it). However, in the case of an internal JDBC driver, the JDBC client actually runs as part of the database ...
SQL-client unable to establish SQL-connection: 08002: X: 08: connection exception: 002: connection name in use: ... non-string data cannot be used with string routine ...
A DataReader can in some cases be used in place of a DataTable, however many programmers have experienced connection bloat when following this approach. A DataReader can only be used against an (already) open database connection ; that connection isn't closed until the DataReader's Dispose method is called.
In hosted desktop environments, the remote desktop connection broker is the “middle” component, in-between the desktops in the data center (hosted virtual machines, shared terminal server desktops, and blades) and the clients that are used to access the desktops (thin clients, soft clients, and mobile devices, among others).
Major DBMSs, including SQLite, [5] MySQL, [6] Oracle, [7] IBM Db2, [8] Microsoft SQL Server [9] and PostgreSQL [10] support prepared statements. Prepared statements are normally executed through a non-SQL binary protocol for efficiency and protection from SQL injection, but with some DBMSs such as MySQL prepared statements are also available using a SQL syntax for debugging purposes.